Document mqN94wBonGmdNEd6pqXzzBYDg
ANSI/AWWA CIO 1--67 (R197/)
Reaffirmed without revision 1977
AMERICAN NATIONAL STANDARD
/or
THICKNESS DESIGN OF CAST-IRON PIPE
With Tables of Pipe Thicknesses
In Four Parts Sec. 1-1--Thickness Tables for Standard Conditions Sec. 1-2--General Procedure for Thickness Determination Sec. 1-3--Design Theory--Determination of Net Thickness,
Earth Load, and Truck Superload Sec. 1-4--Thickness Determination for Pipe on Piers or Piling
Aboveground or Underground
SPONSORS American Gas Association American Society for Testing and Materials American Water Works Association New Encland Water Works Association Approved by The American National Standard Institute, Nov. 10, 1967
Reaffirmed without revision Jim 9. 1977
PUBLISHED BY
AMERICAN WATER WORKS ASSOCIATION
6666 West Quincy Avenue, Denver, Colorado 80235
CTD000234
t
American National Standard
An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertising and promotion ma terial or on tags or labels that the goods are produced in conformity with particular American National Standards.
CAUTION NOTICE. This American National Standard may be revised or with drawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five (5) years from the date of publication. Purchasers of American National Stand ards may receive current information on all standards by calling or writing the American National Standards Institute, 1430 Broadway, New York, N.Y. 10018, (212) 868-1220.
i Cnpjri^lit 1977 by American Water Works Assn Frinled in US
ii
CTD000235
Committee Personnel
Subcommittee 1--Pipe, which reviewed and recommended reaffirmation of this standard without revision, had the following personnel at that time:
Edward C. Sears, Chairtnan Walter Aiiory, Vice-Chairman
User Members
Robert S. Bryant Frank E. Dolson Lee J. Dosedlo George F. Keenan Leonard Orlando Jr.
Producer Members
Alfred F. Case W. D. Goode Thomas D. Holmes Harold M. Kennedy Jr. W. Harry Smith Sidney P. Teague
Standards Committee A21--Cast Iron Pipe and Fittings, which reviewed and reaffirmed this standard without revision, had the following personnel at that time.
Lloyd W. Weller, Chairman Edward C. Sears, Vice-Chairman Paul A. Schulte, Secretary
Organisation Represented American Gas Association American Society of Civil Engineers American Society of Mechanical Engineers American Society for Testing and Materials
American Water Works Association
Cast Iron Pipe Research Association
Individual Producer Manufacturers' Standardization Society of the
Valve and Fittings Industry X'ew England Water Works Association Xaval Facilities Engineering Command Underwriters' Laboratories, Inc. Canadian Standards Association
Xante of Representative
Leonard Orlando Jr. Kenneth W. Henderson James S. Vanick Ben C. Helton * Joseph J. Palmer * J. Porter Hennings Raymond J. Kocol Robert L. Lee Arnold M. Tinkey Lloyd W. Weller Thomas D. Holmes Harold M. Kennedy Jr. Edward C. Sears W. Harry Smith Alfred F. Case
Abraham Fenster Walter Amory Stanley C. Baker Lee J. Dosedlo W. F. Semenchuk *
* Liaison representative without vote.
in
CTD000236
Table of Contents
Section
Foreword
Pace
History of Standard ........................... vii
Major Features of 1967 Revision___ viii
Standard Thicknesses of Pit-Cast Pipe ix
References and Bibliography .............. x
Sec. 1-1--Thickness Tables for Standard Conditions
1-1.1--General ........................................... 1 1-1.2--Trench Load and Internal Pres
sure ............................................. 1-1.3--Traffic Superload and Surge
Pressure ...............................
1-1.4--Corrosion Allowance and Cast ing Tolerance ...........................
1
2
2
Table
1-1--Schedule of Barrel Thickness for
Water Pipe of 18/40 Iron Strength......................................... 3
1-2--Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength......................................... 18
1-3--Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength 33
Sec. 1-2--General Procedure for Thick ness Determination
Section
1-2.1--Scope ............................................... 45
Section
Pace
1-2.2--Procedure for Thickness Deter
mination ..................................... 45
1-2.3--Example for Determining Thick
ness of 18-in. WaterPipe----- 46
Taole
1-4--Ring Test Load Equivalents (tv) of Trench Loads--lb/linft-------
1-5--Internal Pressure (p) ................... 1-6--Allowances for Casting Tolerance 1-7--Standard Thickness Classes of
Cast-Iron Pipe.............................
47 49 49
50
Ficuaz
1-1--Thickness Nomogram for Pipe of 18/40 Iron Strength, Low-Range Load ..............................................
1-2--Thickness Nomogram for Pipe of 18/40 Iron Strength, High-Range Load ..............................................
1-3--Thickness Nomogram for Pipe of 21/45 Iron Strength, Low-Range Load ..............................................
1-4--Thickness Nomogram for Pipe of 21/45 Iron Strength, MediumRange Load...................................
1-5--Thickness Nomogram for Pipe of 21/45 Iron Strength, High-Range Load ..............................................
50 51 52 53 54
v
CTD000237
VI AMERICAN NATIONAL STANDARD
Sec. 1-3--Design Theory--Determination of Net Thickness, Earth Load, and Truck Superload
Section
Page
1-3.1--Determination of Net Thick ness ....................................... 55
1-3.2--Earth Loads(IV.) ...................... 57
1-3.3--TruckSuperloads(IV,) ................. 60
Table
1-8 --Earth Loads (IV.) and Truck Superloads (W,)--Ib/lin ft ...
1-9 --Load Factors for Cast-Iron Pipe in Ditch and Embankment Conditions .................................
1-10--Allowances for Surge Pressure .. 1-11--Surface Load Factors (C) for
One Truck on Unpaved Road or Flexible Pavement.............. 1-12--Surface Load Factors (C) for Two Passing Trucks on Un paved Road or Flexible Pave ment ............................................. 1-13--Reduction Factors (R) .............. 1-14--Surface Load Factors (K) for One Truck and Two Passing Trucks on Rigid Pavement ... 1-15--Outside Diameters of Cast-Iron Pipe .............................................
62
63 63
64
65 66
66 67
Ficuse
1-6 --Load-Pressure Curve.................. 1-7 --Installation Conditions for Earth
Load Calculations ...................
67 68
Figure
Page
1-8 --Calculation Coefficients (C.) for
Ditch Condition......................... 68
1-9 --Calculation Coefficients (C.) for
Positive-Projection Condition . 69 1-10--Earth Loads on Pipe for Trench
Width (d + 2) ft...................... 70
1-11--Earth Loads on Pipe for Trench Width (d+1) ft......................
1-12--Earth Loads on Pipe in Trench With 1:1 Side Slopes..............
1-13--Earth Loads on Pipe in Trench With 2:1 Side Slopes..............
71 72 73
1-14--Calculation Coefficients (C,,) for
Negative Projection Condition 74
Sec. 1-4--Thickness Determination for Pipe on Piers or Piling Above ground or Underground
Section
1-4.1--Scope ............................................... 1-4.2--Pipe Installed Aboveground With
out Earth Cover........................ 1-4.3--Pipe Installed Underground With
Earth Cover............................... 1-4.4--Design Examples ......................... 1-4.5--Calculation of Beam Stress and
Deflection ...................................
75
75
75 76
76
Table
Pagb
1-16--Weights of Pipe and Contained Water for Design of Above ground Pipe...............................
1-17--Load Factors for Pipe on Spaced Supports Aboveground and Underground .............................
77 78
CTD000238
Foreword
This foreword is provided [or information only and is not a part of ANSI/AWWA C101.
History of Standard
On Sep. 10, 1902, NEWWA adopted a "Standard Specification for CastIron Pipe and Special Castings," covering bell-and-spigot pit-cast pipe and fittings of ten thickness classes. The thickness classes were based on allowable internal pressures varying by increments of SO ft of head.
On May 12, 1908, AWWA adopted a "Standard Specification for Cast-Iron Pipe and Special Castings," covering bell-and-spigot pit-cast pipe and fittings of eight classes, A through H, with allowable working pressures varying by in crements of 100 ft of head from 100 to 800 ft. Dimensions and weights were given for pipe and fittings.
In 1926, ASA Sectional Committee (now ANSI Standards Committee) A21 on Cast-Iron Pipe and Fittings was organized under the sponsorship of AGA, ASTM, AWWA, and NEWWA. The present scope of Committee A21 is:
Standardization of specifications for cast-iron and ductile-iron pressure pipe for gas, water, and other liquids, and fittings for use with such pipe. These specifications to include design, dimensions, materials, coatings, linings, joints, accessories, and methods of inspection and test.
Sectional Committee A21 sponsored many tests of pipe and fittings; these included subjection of pipe to combined earth load and internal pressures (which form the basis of pipe-thickness design), corrosion tests, measurement of hy draulic friction loss in fittings, and tests of bursting strengths of pipe and fittings. After exhaustive study of the test results and other research, the committee in 1939 issued A21.1, "American Standard Practice Manual for the Computation of Strength and Thickness of Cast-Iron Pipe." The manual included nomograms and thickness tables for pit-cast pipe with 11/31 * iron strength. As stated in the preface to that manual, however, the design method was applicable to pipe of any iron strength.
Discussions and interpretations 1*2 of the method of design of cast-iron pipe were published in 1939 and presented to AWWA and AGA. As a result of these publications and because of the general acceptance of A21.1, a substantial volume of cast-iron pipe was designed by the new method and furnished to manu facturers' standards between 1939 and 1953. A standard (A21.2) for pit-cast pipe with 11/31 iron strength also was issued in 1939. Work on standards for centrifugally cast pipe with 18/40 iron strength was started after the design was completed in 1939, but, owing to the intervention of World War II and other causes, they were not formally issued until 1953.
* The first figure designates the bursting tensile strength in units of 1,000 psi and the second figure designates the ring modulus of rupture in units of 1,000 psi.
vu
CTD000239
via
AMERICAN NATIONAL STANDARD
In 1957, a revision of A21.1 was issued. In that revision, designated ASA A21.1-1957 (AWWA Hl-57) the major change was the addition of a method for computing earth loads on pipe laid under embankments and of nomograms and thickness tables for centrifugally cast pipe with 18/40 iron strength.
In 1958, Sectional Committee A21 was reorganized. Subcommittees were established to study each group of standards in accordance with the review and revision policy of ASA (now ANSI). The scope of Subcommittee 1--Pipe is:
To include the periodic review of all current A21 standards for pipe, the prepara tion of revisions or new standards when needed, as well as other matters pertaining to pipe standards.
As a result of the work of Subcommittee No. 1 on this assignment, revisions of the cast-iron pipe standards A21.6 (AWWA Cl06), A21.7, A21.8 (AWWA C108), and A21.9 were issued in 1962 and again in 1970. Revision of A21.11957 (AWWA Hl-57) was delayed in order for the subcommittee to carry out a new assignment from the sectional committee to develop a design standard and pipe standards for ductile-iron pipe. Subsequently, the subcommittee com pleted its study and a revision of A21.1 was issued in 1967.
In 1971 and again in 1976, Subcommittee No. 1 reviewed the 1967 edition and submitted a recommendation to Committee A21 that the standard be re affirmed without change. Therefore, this reaffirmed edition is unchanged from the 1967 edition, except for the updating of this foreword. For convenience, the major features listed in the foreword of the 1967 edition are repeated here.
Major Features of 1967 Revision
Although ANSI A21.1-1967 (AWWA Hl-67) contained no changes in the basic design method, a number of revisions were incorporated to simplify the design procedure and to reflect changes in technology. Major features of the 1967 revision are discussed.
1. Format. This revision is divided into four major sections: Sec. 1-1 gives thickness tables for standard conditions; Sec. 1-2 gives the general procedure for thickness determination; Sec. 1-3 gives design theory and provides methods for determining pipe thicknesses, earth loads, and truck superloads for both standard and special conditions; and Sec. 1-4 gives the design procedure for a special installation condition, pipe on piers aboveground or underground.
2. Iron strength. Thickness tables, nomograms, and other data for pit-cast pipe (11/31 iron strength) were deleted, as this type of pipe is seldom furnished today.
Centrifugally cast pipe covered under ANSI Standards A21.6 (AWWA C106), A21.7, A21.8 (AWWA C108), and A21.9 are specified to have an iron strength of not less than 18/40. Advances in production technology have en abled the manufacturers to furnish pipe with greater strength, and pipe with 21/45 iron strength has been available for many years. Thus, for the con-
CTD000240
THICKNESS DESIGN OF CAST-IRON PIPE
IX
venience of users, tables and figures in the standard cover pipe with iron strengths of both 18/40 and 21/45.
3. Laying conditions. Laying conditions C, D, and E (also called "field conditions" in the 1957 revision) were deleted. Conditions C and D were for pipe laid on blocks, a method sometimes used in the 1920s and 1930s. This method has been recognized as undesirable and is seldom used today. Condition E was for pipe laid with special bedding but without tamping the backfill. It was felt that this combination would rarely be used today; when special bedding is used, the backfill is almost always tamped, giving laying condition F, which was retained in this revision.
4. Earth loads. Formulas and procedures were added (Sec. 1-3) for de termining earth loads for standard and special conditions. Earth loads shown in Table 1-8 are the same as those given in the 1957 revision, except that loads for 20 and 24 ft of cover were added.
5. Allowance for truck superloads. Formulas and procedures were added (Sec. 1-3) for determining truck superloads for standard and special conditions. These procedures may be used to compute truck superloads for unpaved roads, flexible pavement, or rigid pavement; one truck or two passing trucks; and any wheel load and impact factor, including AASHO truck loadings. Truck super loads for standard conditions are shown in Table 1-8 and are the same as given in the 1957 revision, except that loads for 20 and 24 ft of cover were added.
6. Allotixtnce for surge pressure. The allowances for surge pressure (water hammer), shown in Table 1-10, are unchanged from those given in the 1957 revision.
7. Allowance for corrosion. A standard allowance for soil corrosion of 0.08 in., based on judgment and experience of early engineers, was used in the 1939 manual and continued in the 1957 revision. The allowance of 0.08 in. was also retained in this edition. It is very conservative for many soils, and has proved to be adequate in most. In areas suspected or known to be highly corrosive, however, the designer should take special precautions. Where un usually corrosive soil conditions are anticipated, a soil survey is recommended.
8. Pipe on piers. A new section (Sec. 1-4) was added to provide pro cedures for computing thicknesses of pipe installed on piers or piling, a condition sometimes encountered in laying pipe in unstable soil, across streams or swamps, either aboveground or underground, and in installing pipe on bridges and other aboveground structures.
Standard Thicknesses of Pit-Cast Pipe
As stated in the foregoing, thickness tables for pit-cast pipe were deleted in the 1967 edition. During the review of this standard in 1971, it was determined that some standards and codes refer to the table of standard thickness classes for pit-cast pipe shown as Table 10 in the 1957 edition of A21.1. For reference, the contents of that table are reproduced on the next page:
CTD000241
X AMERICAN NATIONAL STANDARD
Standard Thickness Classes for Pit-Cast Pipe*
Pipe Size
in.
Pipe-Wall Thickness (>.) for Standard Thickness Class No.: 1 2 3 4 5 6 7 8 9 10 11 12 1J 14
3 0.37 0.40 0.43 0.46 0.50 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99] 4 0.40 0.43 0.46 0.50 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 6 0.43 0.46 0.50 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 8 0.46 0.50 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 10 0.50 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 1.35 12 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 1.35 1.46 14 0.54 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 1.35 1.46 16 0.58 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 1.35 1.46 1.58 18 0.63 0.68 0.73 0.79 0.85 0.92 0.99 1.07 1.16 1.25 1.35 1.46 1.58 1.71 20 0.66 0.71 0.77 0.83 0.90 0.97 1.05 1.13 1.22 1.32 1.43 1.54 1.66 1.79 24 0.74 0.80 0.86 0.93 1.00 1.08 1.17 1.26 1.36 1.47 1.59 1.72 1.86 2.01
30 0.87 0.94 1.02 1.10 1.19 1.29 1.39 1.50 1.62 1.75 1.89 2.04 2.20 2.38 36 0.97 1.05 1.13 1.22 1.32 1.43 1.54 1.66 1.79 1.93 2.08 2.25 2.43 2.62 42 1.07 1.16 1.25 1.35 1.46 1.58 1.71 1.85 2.00 2.16 2.33 2.52 2.72 2.94 48 1.18 1.27 1.37 1.48 1.60 1.73 1.87 2.02 2.18 2.35 2.54 2.74 2.96 3.20 54 1.30 1.40 1.51 1.63 1.76 1.90 2.05 2.21 2.39 2.58 2.79 3.01 3.25 3.51 60 1.39 1.50 1.62 1.75 1.89 2.04 2.20 2.38 2.57 2.78 3.00 3.24 3.50 3.78
* Each class is mide S per cent heavier than the preceding class, starting with the thinnest, i.e., minimum
thickness, as the base class.
References
1. Wiggin, T. H.; Encer, M. L.; & Schlick, W. J. A Proposed New Method for De termining Barrel Thickness of Cast-Iron Pipe. Jour. AWIVA, 31:841 (May 1939).
2. Moore, W. D. Discussion of the New Law of Design of Cast-Iron Pipe. Jour. AWIVA, 31:1655 (Oct 1939).
3. Schlick, W. J. Supporting Strength of Cast-Iron Pipe for Water and Gas. Ioiva State College Eng. Exp. Sta. Bui. 146 (1940).
Bibliography
Marston, Anson. The Theory of External Loads on Closed Conduits in the Light of the Latest Experiments. Iowa State College Eng. Exp. Sta. Bui. 96 (1930).
Schlick, W. J. Loads on Pipe in Wide Ditches. Ioiva State College Eng. Exp. Sta. Bui. 108 (1932).
Schlick, W. J. & Moore, B. A. Strength and Elastic Properties of Cast-Iron. Ioiva State College Eng. Exp. Sta. Bui. 127 (1936).
Spangler, M. G. Soil Engineering. International Textbook Co., Scranton, Pa. (2nd ed., 1960).
Spangler, M. G. The Supporting Strength of Rigid Pipe Culverts. Ioiva State College Eng. Exp. Sta. Bui. 112 (1933).
Spangler, M. G., et al. Experimental Determination of Static and Impact Loads Trans mitted to Culverts. Ioiva State College Eng. Exp. Sta. Bui. 79 11926).
Spangler, M. G. & Schlick, W. J. Negative Projecting Conduits. Ioiva State College Eng. Report No. 14 (1952--53).
Standard Specifications for Highway Bridges. American Association of State Highway Officials, Washington, D.C. (8th ed., 1961).
Vertical Pressure on Culverts Under Wheel Loads on Concrete Pavement Slabs. Bui. ST 65, Portland Cement Assn., Chicago, 111. (1951),
CTD000242
ANSI/AWWA Cl01-77
Reaffirmed without revision 1977
American National Standard for
Thickness Design of Cast-Iron Pipe
Sec. 1-1--Thickness Tables for Standard Conditions
Sec. 1-1.1--General
Tables 1-1, 1-2, and 1-3, as appli cable, permit the direct determination of the required thickness of cast-iron pipe limited to the following condi tions :
a. Vertical-sided trench of width at top of pipe not greater than the nominal pipe diameter plus 2 ft
b. Unit weight of soil 120 lb/cu ft c. Kp = 0.1924, Kfx = 0.130 . (see Sec. 1-3.2 for definition) d. Truck superload based on two passing trucks with adjacent wheels 3 ft apart, 9,000 lb wheel load, un paved road or flexible pavement, 1.50 impact factor e. Surge allowances as shown in Table 1-10 /. Iron strengths of 18/40 and 21/45 * g. The three most common laying conditions: A--Pipe laid on flat-bottom trench, backfill not tamped B--Pipe laid on flat-bottom trench, backfill tamped
* The first figure designates the bursting tensile strength (S) in units of 1,000 psi and the second figure designates the ring modulus of rupture (/?) in units of 1,000 psi.
F--Pipe bedded in gravel or sand, backfill tamped
li. Allowances for casting tolerance as shown in Table 1-6
i. A corrosion allowance of 0.08 in.
Sec. 1-1.2--Trench Load and Inter nal Pressure
The required thickness of cast-iron pressure pipe is determined from a con sideration of trench load and internal pressure in combination. Trench load is considered to consist of the earth load on the pipe plus any superload re sulting from traffic over the trench. Internal pressure is considered to con sist of the design working pressure plus an additional allowance for surge pres sure. Two different combinations of trench load and internal pressure are considered in the design:
Case 1. Trench load (earth load but no truck superload) in combination with internal pressure (working pres sure plus surge pressure) and with 2.5 factor of safety applied to both trench load and internal pressure
Case 2. Trench load (earth load plus truck superload) in combination with internal pressure (working pres sure but no surge pressure) and with
1
CTD000243
9 AMERICAN NATIONAL STANDARD
a 2.5 factor of safety applied to both trench load and internal pressure.
Sec. 1-1.3--Traffic Superload and Surge Pressure
In designing water pipe it is cus tomary to assume that neither traffic superload nor surge pressure will oc cur in important magnitude simultane ously. Thus, calculations for the re quired thickness of water pipe are made for both conditions independently, and the greater of the two thicknesses thus determined is chosen as the net thick ness.
In designing gas pipe the procedure is the same, except that surge pressure is not a factor and only Case 2 is con sidered.
Sec. 1-1.4--Corrosion Allowance and Casting Tolerance
To the net thickness determined as explained above, a corrosion allowance and a casting tolerance are added to obtain the calculated thickness shown in Tables 1-1, 1-2, and 1-3. The stand ard thickness class and/or the nominal thickness for this class shown in Tables 1-1, 1-2, and 1-3 are used for specifying and ordering pipe.
For other than standard conditions the formulas, tables, and diagrams in Sec. 1-2 may be used. The design theory on which Tables 1-1, 1-2, and 1-3 are based is presented in Sec. 1-3. Procedures for determining the net thickness of pipe on piers or piling above- or belowground are presented in Sec. 1-4.
CTD000244
TABLE 1-1 Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--Pri SO 100 150 200 250 | 300 | 350
Barrel Thicknesses--in.
Three-Inch Water Pipe
Calculated Thickness
ji* .21* .22* .22* .22* 22* .23*
21 ,, / Thickness Class
22 22 22 22 22 22 22
Use 1 Thickness
42 -32 42 42 .32 42 .32
Calculated Thickness
.21* 21* .22* 22* .22* 42* 43*
31
/Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.32 .32 .32 .32 .32 42 .32
Calculated Thickness
.21* .21* .22* .22* 23 .23 .24
5
/Thickness Class
22 22 22 22 11 22 22
U8e (Thickness
42 42 42 .32 .32 42 42
Calculated Thickness
22* 4J* 23* 24 24 24 25
8
/Thickness Class
22 22 22 22 22 21 22
u" (Thickness
.32 .32 .32 .32 42 42 42
Calculated Thickness
24* -23* 25* 26 26 27 .22
12
iT,, /Thickness Class
22 22 22 22 22 22 22
u" (Thickness
42 42 42 42 42 42 .32
Calculated Thickness
.27 27 2S 22 2t 4f> .30
16
/Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.32 42 42 42 42 42 .32
Calculated Thicknesa
.21* .21* .22* 22* 42* .22* 23*
21 rT,, /Thickness Class
22 22 22 22 22 22 22
u" (Thicknesa
42 .32 42 .32 42 .32 J2
Calculated Thickness
.2/* 21* 22* 22* 42* 42* .23*
31
/Thickness Class
22 22 22 22 22 22 22
Use (Thickness
42 42 .32 42 42 .32 .32
Calculated Thickness
.21* .21* .22* .22* .23 23 .24
5
,. /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.32 42 .32 .32 42 .32 .32
Calculated Thickness
.22* 22* .23* 23* 43 .24 .24
8
IT,, /Thickness Class
22 22 22 11 22 22 22
Use (Thickness
42 .32 .32 42 42 .32 .32
Calculated Thickness
24* .24* .25 25 .26 .26 .27
12
ru. /Thickness Class
22 22 22 11 22 22 22
u,e (Thickness
42 42 42 .32 .32 .32 42
Calculated Thickness
a6 26 .27 27 43 .2
20
16
, /Thickness Class
22 22 22 22 22 21 22
Use (Thickness
42 .32 .32 .32 .32 .32 .32
Calculated Thickness
.21* .21* 21* .21* 22* .22* .23
21 . /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.32 .32 .32 .32 42 .32 42
Calculated Thickness
.21* 21* .21* .21* .22* .22* .23
31
/Thickness Class
22 22 22 22 22 22 21
Ust (Thickness
.32 .32 .32 .32 .32 .32 .32
Calculated Thickness
.21* .21* .21* .22* 42* .22* 43
5
Tt,, /Thickness Class
22 72 22 22 22 22 22
Lse \ Thickness
.32 .32 .32 .32 .32 .32 .32
Calculated Thickness
.21 .21 .22 .22 23 .23 .24
8
IT,, /Thickness Class
22 22 22 22 22 22 22
U5e (Thickness
.32 .32 .32 .32 .32 .32 .32
Calculated Thickness
.23 23 .23 .24 .24 .24 .25
12
,/Thickness Class
22 22 22 22 22 22 22
u" (Thickness
.32 .32 .32 .32 .32 .32 .32
Calculated Thickness
24 .24 .25 .25 .26 .26 .27
16
tt-- /Thickness Class
22 22 22 22 22 22 22
Use \ Thickness
.32 .32 .32 .32 .32 42 .32
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
3
CTD000245
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
n
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thicknesses--in.
Four-Inch Water Pipe
350
Calculated Thickness
.23* .23* .24* .24* .24* .25* .27
21 .. /Thickness Class
22 22 22 22 22 22 22
\ Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.33* .23* .23* .24 .24 .25 .27
31
J Thickness Class
22 22 22 22 22 22 22
\Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.23* .24* .24* .25 .26 .27 .28
5
/Thickness Class
22 22 22 22 22 22 22
uac \Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.25* .26 .27 .28 ,2S .29 .30
s
it-- /Thickness Class
22 22 22 22 22 22 22
U3e (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
29 .29 .30 JO .3/ .3/ .32
12
./Thickness Class
22 22 22 22 22 22 22
U3e \Thickness
35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.31 .31 .32 .32 .33 .33 .33
16
*T__ /Thickness Class
22 22 22 22 22 22 22
U8e \Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
23* .23* .23* .23* .34* .25
.27
21
/Thickness Class u#e \Thickness
22 22 22 22 22 22 22 .35 .35 .35 .35 .35 .35 .35
Calculated Thickness
23* .23* .23* .24 25 .26 .27
31
T_ /Thickness Class \Thickness
22 22 22 22 22 22 22 .35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.23 .24 .24 .25 26 27 .23
5
/Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.25 .26 .27 .27 .28 .29 .29
s
it-- /Thickness Class
22 22 22 22 22 22 22
u" (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
23 .23 .29 .30 .30 .31 .32
12
it-- /Thickness Class
22 22 22 22 22 22 22
u" (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.30 .31 .31 .32 .32 .33 .JJ
16 t__ /Thickness Class 22 22 22 22 22 22 22
Usc \Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.23* .23* .23* .24* .24 .25 .26
21 t / Thickness Class
22 22 22 22 22 22 22
L3e (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
23* .23* .23 .24 .24 .25 .26
31 n-- /Thickness Class
22 22 22 22 22 22 22
U3e (Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.23 .23 .23 .24 .24 .25 .26
5
T. / Thickness Class
22 22 22 22 22 22 22
\Thickness
.35 .35 .35 .35 .35 .35 .35
Calculated Thickness
.24 .24 .25 .25 .25 .26 .27
3
jr /Thickness Class
22 22 22 22 22 22 22
\Thickness
.35 .35 .35 .35
.35 .35
35
Calculated Thickness
.25 .26 .17 .28 .28 .29 .30
12
t/Thickness Class
22 22 22 22 22 22 22
u#e \ Thickness
.35 .35 .35 .35 .35 .35 .35
16
Calculated Thickness T* /Thickness Class
.28 22
.28 12
.29 22
.29 22
.30 22
.30 22
.31
n
c \Thickness
.35 .35 35 . 55 .35 .35 35
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
4
CTD000246
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
/<
Thickness Specifications
Internal Pressure--fist 50 100 150 200 250 300 | 350
Barrel Thicknesses--in.
Six-Inch Water Pipe
Calculated Thickness 21 r. /Thickness Class
use \Thickness
.29* .29* .30* ji* M* .33* .34 22 22 22 22 22 22 22 .38 .38 .38 .38 .38 .38 .38
Calculated Thiclcneu
.28* .23* .29* .30* .31* .32* .34
31 .... /Thickness Class
22 22 22 22 22 22 22
u" (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.29* .29* .JO* .31* .33 .34 .JJ
5
/Thickness Class
22 22 22 22 22 22 22
use (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.32 .33 .34 .35 .36 .37 .JJ
8
/Thickness Class
22 22 22 22 22 22 22
u" (Thickness
J8 .38 .38 .38 .38 .38 .38
Calculated Thickness
.36 .37 .33 .33 .39 .40 .41
12
it.. /Thickness Class
22 22 22 22 22 23 23
use (Thickness
.38 .38 .38 .38 .38 .41 .41
Calculated Thickness
.39 .40 .41 .42 .42 .43 .44
16 .... /Thickness Class 22 23 23 23 23 24 24
use (Thickness
.38 .41 .41 .41 .41 .44 .44
21
31
5 B
8
12
16
Calculated Thickness i r.. / Thickness Class u" (Thickness
Calculated Thickness n,, /Thickness Class use (Thickness
Calculated Thickness Tt /Thickness Class ose (Thickness
Calculated Thickness T/Thickness Class U8e \Thickness
Calculated Thicknesa /Thickness Class
UK (Thickness
Calculated Tliickness it.. /Ihickness Class UM (Thickness
.23* .23* .29* .30* .31* .32* .33* 22 22 22 22 22 22 22 .38 .38 .38 38 .38 .38 .38
J7* 28* .23* .29* .JO* .32
22 22 22 22 22 22 .38 J8 .38 .38 .38 .38
.34 22
.38
.23* .29 .JO .31 .J2 .JJ .34 22 22 22 22 22 22 22 .38 .38 .38 .38 .38 .38 .38
.31 .32 .33 .34 .35 .36 .37 22 22 22 22 22 22 22 .38 .38 .38 .38 .38 .38 .38
.35 JS .36 J7 J3 .39 .40 22 22 22 22 22 22 23 .38 .38 .38 J8 .38 .38 .41
.33 .33 .39 .40 .41 .42 .43 22 22 22 23 23 23 24 .38 .38 .38 .41 .41 .41 .44
Calculated Thickness
.26* .27* .28 .29 .JO .32 .34
21
/Thickness Class
22 22 22 22 22 22 22
U8e (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.27 .27 .28 .29 .30 .32 .34
31 i r.. 1 Thickness Class
22 22 22 22 22 22 22
U9e (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.23 .28 .29 .29 .30 .32 .35
5
it-- /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.29 .30 .31 .32 .33 .34 .J5
8
tt / Thickness Class
22 22 22 22 22 22 22
US \ Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.32 .33 .34 .35 .36 .37 JJ
12
rt /Thickness Class
22 22 22 22 22 22 22
sc (Thickness
.38 .38 .38 .38 .38 .38 .38
Calculated Thickness
.35 .35 .36 .37 .38 .39
40
16
j t /Thickness Class
22 22 22 22 22 22 23
9e (Thickness
.38 .38 .38 .38 .38 .38 .41
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
5
CTD000247
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of IS/40 Iron Strength
Laying Condi
tion
Depth of
a
Thickness Specifications
Internal Pressure--psi
SO too 150 200 250 300
Barrel Thicknesses--in.
Eight-Inch Water Pipe
350
24
34
5 A
8
12
16
Calculated Thickness t- /Thickness Class Use \Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness it.. /Thickness Class L,e (Thickness
Calculated Thickness /Thickness Class (Thickness
Calculated Thickness ./Thickness Class u,e (Thickness
.j-i* 22 .41
jj* 22 .41
j-i* 22 .41
JS 22 .41
.43 23 .44
.40 24 .48
.35* 22 .41
.34* 22 .41
J5* 22 .41
.39 22 .41
.44 23 .44
.47 24 .48
.36* 22 .41
.34* 22 .41
.36* 22 .41
.40 22 .41
.45 23 .44
.43 24 .48
J7* 22 .41
.35* 22 .41
.37* 22 .41
.41 22 .41
.40 24 .48
.49 24 .48
.33* 22 .41
JO* 22 .41
J9 22 .41
.43 23 .44
.47 24 .48
.51 25 .52
.39* 22 .41
.39 22 .41
.41 22 .41
.44 23 .44
.49 24 .48
52 25 .52
.40* 22 .41
.41 22 .41
.43 23 .44
.40 24 .48
JO 25 .52
.53 25 .52
24
34
5 B
8
12
16
Calculated Thickness /Thickness Class
u,e (Thickness
Calculated Thickness /Thickness Class
U8e (Thickness
Calculated Thickness it.. /Thickness Class Lse (Thickness
Calculated Thickness /Thickness Class
Use \Thickness
Calculated Thickness /Thickness Class
U8e (Thickness
Calculated Thickness n.s. /Thickness Class U8e \Thickness
.32* .33* .34* .35* .30* .33* .39* 22 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41 .41
JZ* .33* .33* .34* JO* .38 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41
JJ* .34* .35 .36 J8 .40 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41
.40 22
.41 D)
.42
22 .41
J6 .37 .38 .40 .41 .43 .45
22 22 22 22 22 23 23 .41 .41 .41 .41 .41 .44 .44
.41 .42 .43 .44 .46 .47 .48 22 22 23 23 24 24 24
).41 .41 .44 .44 .48 .48 .48
.44 .45 ,46 .47 .43 .50 .51 23 23 24 24 24 25 25 .44 .44 .48 .48 .48 .52 .52
24
34
5 f
8
12
16
Calculated Thickness u*{Th"SScl"
Calculated Thickness tt /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
use (Thickness
Calculated Thickness r /Thickness Class Lse (Thickness
Calculated Thickness fta_ /Thickness Class ^3e \Thickness
Calculated Thickness i - /Thickness Class LSe (Thickness
JO* .3/* .32* .33* .35 .37 J9 22 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41 .41
29* JO* .31 JJ .35 .37 .39 22 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41 .41
JO* .31* .32 .34 .36 .38 .40 22 22 22 22 22 22 22 .41 .41 .41 .41 .41 .41 .41
.34 .35 .36 .37 .39 .41 .43 22 22 22 22 22 22 23 .41 41 .41 .41 .41 .41 .44
J8 J9 .40 .41 .43 .44 .46 22 22 22 22 23 23 24 .41 .41 .41 .41 .44 .44 .48
.40 .41 .42 .43 .45 .46 .43 22 22 22 23 23 24 24 .41 .41 .41 .44 .44 .48 .48
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec, 1-2.1.
6
CTD000248
JJ
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi-
of Cover
n
Thickness Specifications
Internal Pressure--psi
so 100 ISO 200 | 250 | 300
Barrel Thicknesses--in.
Ten-Inch Water Pipe
' 350
Calculated Thickness
.40* .41* .42* .43* .45* .46* A8*
21 rr /Thickness Class
22 22 22 22 22 23 23
use \ Thickness
.44 .44 .44 .44 .44 .48 .48
Calculated Thickness
.39* .40* .41* .43* A4* .46
.49
31 r. /Thickness Class
22 22 22 22 22 23 23
L3e (Thickness
.44 .44 .44 .44 .44 .48 .48
Calculated Thickness
.40* .41* .42* .44 .46 .48 .51
5
1 Thickness Class
22 22 22 22 23 23 24
Use \Thickness
.44 .44 .44 .44 .48 .48 .52
Calculated Thickness
.44 .46 .47 .49 .51 .53 .55
8
it.. /Thickness Class
22 23 23 23 24 24 25
uae (Thickness
.44 .48 .48 .48 .52 .52 .56
Calculated Thickness
.St .52 .S3 .55 .56 .58 .60
12
_ /Thickness Class
24 24 24 2S 25 26 26
use (Thickness
.52 .52 .52 .56 .56 .60 .60
Calculated Thickness
.S3 .54 .56 .57 .59 .60 .62
16
/Thickness Class
24 25 25 25 26 26 26
Use (Thickness
.52 .56 .56 .56 .60 .60 .60
21
31
5 B
8
12
16
Calculated Thickness /Thickness Class
u" (Thickness
Calculated Thickness .... /Thickness Class uae (Thickness
Calculated Thickness t__ /Thickness Class Use \ Thickness
Calculated Thickness i r.. /Thickness Class use (Thickness
Calculated Thickness .... /Thickness Class ua* (Thickness
Calculated Thickness /Thickness Class
U3e \ Thickness
.33* .39* .40* .41* .43* .45* .47*
22 22 22 22 22 22 23
.44 .44 .44 .44 .44 .44
48
.37* .33* .39* .40* .42* .44
22 22 22 22 22 22 .44 .44 .44 .44 .44 .44
.48 23 .48
.33* .39* .40* .42 .45 .47 .50 22 22 22 22 22 23 24 .44 .44 .44 .44 .44 .48 .52
.41* .44 .45 .47 .49 .51 .53 22 22 22 23 23 24 24 .44 .14 .44 .48 .48 .52 .52
.48 .49 .51 .52 .54 .56 .58 23 23 24 24 25 25 26 .48 .48 .52 .52 .56 .56 .60
.SO .52 .53 .54 .56 .58 .60 24 24 24 25 25 26 26 .52 .52 .52 .56 .56 .60 .60
1 21 31 5 3 12 16
Calculated Thickness tT . /Thickness Class use \Thickness
Calculated Thickness r* /Thickness Class use (Thickness
Calculated Thickness /Thickness Class L,se (Thickness
Calculated Thickness /Thickness Class
'~3e (Thickness
Calculated Thickness rr /Thickness Class L3 (Thickness
Calculated Thickness t ; Thickness Class
(Thickness
.35* .36* .37* .38* .41 .44 .47 22 22 22 22 22 22 23 .44 .44 .44 .44 .44 .44 .48
.34* .35* .36* .38 .41 .44 .47 22 22 22 22 22 22 23 .44 .44 .44 .44 .44 .44 .48
.35* .36* .38 .40 .42 .46 .48 22 22 22 22 22 23 23 .44 .44 .44 .44 .44 .48 .48
.39 .41 .42 .44 .46 .48 22 22 22 22 23 23 .44 .44 .44 .44 .48 .48
5/ 24
52
.44 .45 .46 .48 .50 .52 .54 22 22 23 23 24 24 25 .44 .44 .48 .48 .52 .52 .56
.46 .47 .49 .51 .52 .54 .56
23 23 23 24 24 25 15
.48 .48 .48 .52 .52 .56
56
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
(
CTD000249
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of IS/40 Iron Strength
Laying Condi
tion
Depth ot
Cover
ft
Thickness Specifications
Internal Pressure--psi 100 150 200 250 300
Barrel Thicknesses--in.
Twelve-Inch Water Pipe
350
21
31 5
A
8
12
16
Calculated Thickness *_. /Thickness Class Lse \ Thickness
Calculated Thickness IIsI_ /Thickness Class
(Thickness
Calculated Thickness ir__ /Thickness Class Use (Thickness
Calculated Thickness ,* /Thickness Class Use (Thickness
Calculated Thickness ir,, /Thickness Class Use (Thickness
Calculated Thickness r/Thickness Class
(Thickness
.IS* 22 .48
.43 22 .43
.45* 22 .48
.50 23 .52
.56 24 .56
.59 25 .60
.46* 22 .43
.45* 22 .48
.46* 22 .48
.52 23 .52
.57 24 .56
.60 25 .60
.47* 22 .48
.46* 22 .48
.47* 22 .48
.53 23 .52
.59 25 .60
.61 25 .60
49* 22 .48
.43* 22 .48
.49 22 .48
.55 24 .56
.60 25 .60
.63 26 .65
51* 23 .52
.50* 13 .52
.52 23 .52
.57 24 .56
.62 25 .60
.65 26 .65
.53* 23 .52
.51 23 .52
.54 24 .56
.60 25 .60
.64 26 .65
.67 26 .65
.55* 24 .56
.55 24 .56
.57 24 .56
.62 25 .60
.67 26 .65
.50 27 .70
21
31
5 B
8
12
16
Calculated Thickness *r /Thickness Class L5e lThickness
Calculated Thickness i-.. ! Thickness Class v'5e \Thickness
Calculated Thickness r* /Thickness Class l-be IThickncss
Calculated Thickness ?__ /Thickness Class use (Thickness
Calculated Thickness it.. /Thickness Class use \ Thickness
{S:asscl"Calculated Thickness
.42* .44* .45* .46* .43* .50* .53* 22 22 22 22 22 23 2 3 .48 .48 .48 .48 .48 .52 .52
.41* .42* .44* .45* .47* .51 11 22 22 22 22 23 .48 .48 .48 .48 .48 .52
.55 24
.56
.42* .43* .45* .47 .50 .53 .'*4 22 22 22 if 23 23 24 .48 .48 .48 .48 .52 .52 .56
.48 .49 .51 .53 .55 .57 .50 22 22 23 23 24 24 25
.48 .48 .52 .52 .56 .56 .60
.53 .54 .54 .57 .59 .61 .64
23 24 24 24 25 25 26
.52 .56 .56 .56 .60 .60
65
.55 .57 .53 .60 .62 .64 .66 24 24 25 25 25 26 26 .56 .56 .60 .60 .60 .65 .65
21
31
5 F
8
12
\U
Calculated Thickness tra- /Thickness Class U9e (Thickness
Calculated Thickness I- /Thickness Class t-se (Thickness
Calculated Thickness i _ /Thickness Class US (Thickness
Calculated Thickness r-_ /Thickness Class Lse (Thickness
Calculated Thickness T-a. /Thickness Class Lse IThickncss
Calculated Thickness r /Thickness Class
\Tl\ickness
.39* 22 .48
.33* 22 .48
.39* 22 .48
.44 22 .48
.43 22 .48
.50 23 52
.40* 22 .48
.39* 22 .48
.40* 22 .48
.45 22 .48
.49 22 .48
.52 23 52
.41* 22 .48
.40* 22 .48
.41* 22 ,48
.47 22 .48
.51 23 .52
.53 23 .52
.43* 22 .48
.43* 22 .48
.43* 22 .48
.49 22 .48
.53 23 .52
.55 24 56
.45* 22 .48
.45 22 .48
.46 22 .48
.52 23 .52
.55 24 .56
.57 24 56
.49 22 .48
.50 23 .52
.50 23 .52
.55 24 .56
53 25 60
.50 25 60
.53 23 .52
.5J 23 .52
.54 24 .56
.5 5 25 .60
61 25 60
.62 25 .oO
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See Sec. 1-2.1.
8
CTD000250
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
/i
Thickness Specifications
Internal Pressu e--psi 50 100 J 150 200 250 300
Barrel Thicknesses--in.
Fourteen-Inch Water Pipe
350
Calculated Thickness
.51* .52* .5-/* .55* .58* .60* .62*
21
/Thickness Class
22 22 23 23 24 24 25
L'3e (Thickness
.51 .51 .55 .55 .59 .59 .64
Calculated Thickness
.50* .51* .53* .54* .57* .60
.64
31
. /Thickness Class Use (Thickness
22 22 23 23 24 2 4 25 .51 .51 .55 .55 .59 .59 .64
Calculated Thickness
.51* .53* .54* .56* .59 .62 .66
5
T- /Thickness Class
22 23 23 23 24 25 25
bse \ Thickness
.51 .55 .55 .55 .59 .64 .64
Calculated Thickness
,5S .60 .62 .64 .66 .69 .72
S
/Thickness Class
24 24 25 25 25 26 27
use (Thickness
.59 .59 .64 .64 .64 .69 .75
Calculated Thickness
.63 .65 .67 .69 .7/ .74 .76
12
.r /Thickness Class
25 25 26 26 26 27 27
Use (Thickness
.64 .64 .69 .69 .69 .75 .75
Calculated Thickness
.67 .68 .70 .72 .74 .76 .70
16
,. / Thickness Class
26 26 26 27 27 27 28
Lse (Tlhcknes*
.69 .69 .69 .7S .75 .75 .8!
21
3
5 B
8
12
16
Calculated Thickness _ /Thickness Class U8e (Thickness
Calculated Thickness i . 1 Thu kness Class Lse (Thickness
Calculated Thickness /Thickness Class
use (Thickness
Calculated Thickness ,. (Thickness Class Lse (Thickness
Calculated Thickness tj,, /Thickness Class U9e (Thickness
Calculated Thickness t / Thickness Class U9e (Thickness
.47* 21 .48
.46* 21 .48
.48* 21 .48
.S4 23 .55
.59 24 .59
.62 25 .64
.49* 21 .48
.47* 21 .48
.49* 22 .51
.56 23 .55
.61 24 .59
.64 25 .64
.51* 22 .51
.49* 22 .51
.52 22 .51
.58 24 .59
.63 25 .64
.66 25 .64
.52* 22 .51
.51* 22 .51
.54 23 .55
.61 24 .59
.65 25 .64
.68 26 .69
.54* 23 .55
.54 23 .55
.57 24 .59
.63 2S .64
.68 26 .69
.70 26 .69
.57* 24 .59
.57 24 .59
.61 24 .59
66 25 .64
.70 26 .69
.73 27 .75
.62 25 .64
.63 25 .64
.65 25 .64
.69 26 .69
.73 27 75
75 27 .75
.Calculated Thickness
.44* .45* .47* .49* .52 .57 .61
2!
, /Thickness Class Lse (Thickness
21 21 21 21 22 24 24 .48 .48 .48 .48 .51 .59 .59
Calculated Thickness
.44* .45* .47 .50 .53 .57 .62
31
/Thickness Class
21 21 21 22 23 24 25
Lse (Thickness
.48 .48 .48 .51 .55 .59 .64
r-Calculated Thickness
.45 .47 .49 .52 .55 .59 .64
5
/Thickness Class
21 21 21 22 23 24 25
s (Thickness
.48 .48 .48 .51 .55 .59 .64
Calculated Thickness
.50 .52 .54 .57 .60 .64
66
8 T. /Thickness Class 22 22 23 24 24 25 25
(Thickness
.51 .51 .55 .59 .59 .64
64
Calculated Thickness
.54 .56 .58 .61 .63 .66 .69
12 . /Thickness Class 23 23 24 24 25 25 26
" e (Thickness
.55 .00
59 .59 .64 .64
69
Calculated Thickness
.57 .58 .60 .63 .65 .68 .71
\16
f. .'Thickness Class
24 24 24 25 25 26 26
se Thickness
.59 .59 .59 .64 .64 .69 .69
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
9
CTD000251
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
ft
Thickness Specifications
Internal Pressure--psi 50 100 | ISO 200 250 300
Barrel Thicknesses--in.
Sixteen-Inch Water Pipe
Calculated Thickness
.5-1*
.56*
.58*
.60*
.62*
.65*
.68*
21 ,r.. /Thickness Class
22 23 23 23 24 24 25
use l Thickness
.54 .58 .58 .58 .63 .63 .68
Calculated Thickness
.54*
.55*
.57*
.59*
.61
.65
.70
34 ,r,, /Thickness Class
22 22 23 23 24 24 25
use /Thickness
.54 .54 .58 .53 .63 .63 .68
Calculated Thickness
.56*
.57*
.59*
.6t*
.64
.68
.72
5
Ma* /Thickness Class
23 23 23 24 24 25 26
U9e (Thickness
.58 .58 .58 .63 .63 .68 .73
Calculated Thickness
.62 .64 .66 .69 .72 .75 .78
8
Tie* /Thickness Class
24 24 25 25 26 26 27
(Thickness
.63 .63 .68 .68 .73 .73 .79
Calculated Thickness
.68 .70 .72 .74 .77 .80 .83
12
n.. /Thickness Class
25 25 26 26 27 27 23
use \ Thickness
.68 .68 .73 .73 .79 .79 .85
Calculated Thickness
.72 .74 .76 .78 .81 .83 .86
16
it.. /Thickness Class
26 26 27 27 27 28 28
use \ Thickness
.73 .73 .79 .79 .79 .85 .85
21
31
5
B 8
12
16
Calculated Thickness nM /Thickness Class Use (Thickness
Calculated Thickness n. /Thickness Class u" (Thickness
Calculated Thickness i*.. /Thickness Class
(Thickness
Calculated Thickness TTb* /Thickness Class use (Thickness
Calculated Thickness it.. /Thickness Class us* (Thickness
Calculated Thickness u. /Thickness Class U3e (Thickness
.50* 21 .50
.50* 21 .50
.52* 22 .54
.58 23 .58
.63 24 .63
.67 25 .68
.52* 22 .54
.52* 22 .54
.53* 22 .54
.60 23 .58
.65 24 .63
.69 25 .68
.54* 22 .54
.53* 22 .S4
.55* 22 .54
.62 24 .63
.68 25 .68
.71 26 .73
.56* 23 .58
.56* 23 .S8
.58 23 .58
.65 24 .63
.70 25 .68
.73 26 .73
.56* 23 .58
.59 23 .58
.62 24 .63
.68 25 .68
.73 26 .73
.76 27 .79
.62* 24 63
.63 24 .63
.66 25 .68
.71 26 .73
.76 27 .79
.79 27 .79
.65* 25 .68
.68 25 .68
.70 25 .68
.75 26 .73
.79 27 .79
.2
28 .85
21 31 5 8
12 16
|
Calculated Thickness ttc /Thickness Class
(Thickness
Calculated Thickness t/Thickness Class
(Thickness
Calculated Thickness rr /Thickness Class
(Thickness
Calculated Thickness /Thickness Class (Thickness
Calculated Thickness !,- /Thickness Class
(Thickness
Calculated Thickness T- /Thickness Class LaC (Thickness
.47*
.Vi*
.50*
.52*
.56
.61
.<57
21 21 21 22 23 24 25
.50 .50 .50 .54 .58 .63 .68
.46*
.47*
.50
.53
.57
.62
.67
21 21 21 22 23 24 25
.50 .50 .50 .54 .58 .63 .68
.48*
.50
.52
.56
.59
.64
.68
21 21 22 23 23 24 25
.50 .50 .54 .58 .58
63 .68
.53 .55 .58 .61 .64 .68
22 22 23 24 24 25 26
.54 .54 .58 .63 .63
68 .73
.57 59 .62 .65 .68 .71 .7 5
23 23 24 24 25 26 26
.58 .58
63 .63 .68
73 .73
61 .63 .65 .68 .71
74 .77
24 24 24 25 26 26 >;
.63 63 63 .68 .73 73 ;>
* Asterisk following totai calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See Sec. 1-2.1.
10
CTD000252
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thicknesses--in.
Eighteen-Inch Water Pipe
21
31
5 A
S
12
16
Calculated Thickness .T,,_ /Thickness Class use \Thickness
Calculated Thickness it-- /Thickness Class U5e lThickness
Calculated Thickness it.. /Thickness Class use (Thickness
Calculated Thickness it.. /Thickness Class u" (Thickness
Calculated Thickness Tiu / Thickness Class
(Thickness
..Calculated Thickness
rr /Thickness Class u" (Thickness
.5S* 22 .58
.34* 22 .58
.60* 22 .58
.67 24 .68
.73 25 .73
.77 26 .79
.60* 22 .58
.Si* 22 .58
.62* 23 .63
.69 24 .68
.75 25 .73
.80 26 .79
.62* 23 .63
.62* 23 .63
.64* 23 .63
.72 25 .73
.73 26 .79
.82 27 .85
.65* 23 .63
.64* 23 .63
.67 24 .68
.74 25 .73
.30 26 .79
.85 27 .85
.67* 24 .68
.67* 24 .68
.70 24 .68
.77 26 .79
3J 27 .85
.33 27 .85
.70* 24 .68
.70 24 .68
.75 25 .73
.2/ 26 .79
.36 27 .85
.91 28 92
,74* 25 .73
.76 26 .79
.79 26 .79
.35 27 .85
90 28 .92
.95 28 .92
21
31
5 B
s
12
16
Calculated Thickness /Thickness Class
uae (Thickness
..Calculated Thickness
IT /Thickness Class u" (Thickness
Calculated Thickness it.. /Thickness Class U5e (Thickness
Calculated Thickness IT,, /Thickness Class U8e (Thickness
Calculated Thickness t!,, /Thickness Class Use (Thickness
..Calculated Thickness
IT /Thickness Class u,e (Thickness
.54* 21 .54
.53* 21 .54
.55* 21 .54
.62 23 .63
.63 24 .68
.72 25 .73
.56* 22 .58
.55* 21 .54
.53* 22 .58
.64 23 .63
.70 24 .68
.74 25 .73
.53* 22 .58
.57* 22 .58
.60 22 .58
.67 24 .68
.73 25 .73
.76 26 .79
.60* 22 .58
.60 22 .58
.63 23 .63
.70 24 .68
.75 25 .73
.79 26 .79
.63* 23 .63
.64 23 .63
.67 24 .68
.74 25 .73
.73 26 .79
.82 27 .85
.67 24 .68
.69 24 .68
.72 25 .73
.77 26 .79
.82 27 .85
.35 27 .85
,7J
25 .73
.75 25 .73
.77 26 .79
.2 27 .85
.26 27 .85
.29 28 .92
21 31
5 F
3
12
16
Calculated Thickness it.. /Thickness Class U5e (Thickness
Calculated Thickness tt-- /Thickness Class use \ Thickness
Calculated Thickness !,, /Thickness Class Lse (Thickness
Calculated Thickness . /Thickness Class e (Thickness
Calculated Thickness
\tte. /Thickness Class
use Thickness
!,,Calculated Thickness /Thickness Class ae (Thickness
.50*
.SI*
.53*
.56*
.61
.67
.73
21 21 21 22 23 24 25
.54 .54 .54 .58 .63 .68 .73
.49* .51 .53 .57 .62 .67 .73
21 21 21 22 23 24 25 .54 .54 .54 .58 .63 .68 .73
.51* .53 .57 .60 .65 .70 .75
21 21 22 22 23 24 25 .54 .54 .53 .53 .63 .68 .73
.57 .59 .62 .65 .69 ,74 .73 22 22 23 23 24 25 26
.58 .58 .63 .63 .68 .73 .79
.61 .64 .67 .70 .73 .77 .81
23 23 24 24 25 26 26
.63 .63
68 .68 .73 .79 .79
.65 67 .69 .72 .76 .80 .34 23 24 24 25 26 26 27 .63 .68 68 .73 .79 .79 .85
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
11
CTD000253
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi-
of Cover
f>
Thickness Specifications
Internal Pressu re--psi 50 100 150 200 250 300
Barrel Thicknesses--in.
Twenty-Inch Water Pipe
350
Calculated Thickness
.62* .65* .67* .70* .75* .76*
21
/Thickness Class
22 23 23 24 24 25 25
Lse ) Thickness
.62 .67 .67 .72 .72 .73 .73
Calculated Thickness
.62* .64* .66* .69* .72* .76* .80
31 Tr / Thickness Class
22 22 23 23 24 25 26
use ^Thickness
.62 .62 .67 .67 .72 .78 .84
Calculated Thickness
.65* .67* .69* .72* .75* .M
.85
5
(Thickness Class
23 23 23 24 25 25 26
Use \ Thickness
.67 .67 .67 .72 .78 .78 .34
Calculated Thickness
.71 .72 .76 .79
.87 .91
s
ITo_ /Thickness Class
24 24 25 25 26 26 27
^ \ Thickness
.72 .72 .78 .78 .84 .84 .91
Calculated Thickness
.78 JO .83 .86 .J0 .93 .97
12
. (Thickness Class
25 25 26 26 27 27 28
use (Thickness
.78 .78 .84 .84 .91 .91 .98
Calculated Thickness
.83 .86 .88 .91 .04 .07 1.01
16
n-- /Thickness Class
26 26 27 27 27 28 28
\Thickness
.84 .84 .91 .91 .91 .98 .98
21
31
5 B
8
12
16
Calculated Thickness ir.. /Thickness Class use \Thicknesa
Calculated Thickness (Thickness Class
use (Thickness
Calculated Thickness T /Thickness Class Lse (Thickness
Calculated Thickness it-- /Thickness Class usc \Thickness
Calculated Thickness tt,, /Thickness Class use (Thickness
Calculated Thickness /Thickness Class
U9e \Thickncss
.57* 21 .57
.57* 21 .57
.59* 21 .57
.65 23 .67
.71 24 .72
.76 25 .78
.59* 21 .57
.58* 21 .57
.61* 22 .62
.68 23 .67
.74 24 .72
.78 25 .78
.62* 22 .62
.62* 22 .62
.64* 22 .62
.71 24 .72
.77 25 .78
.81 26 .84
.65* 23 .67
.64* 22 .62
.67 23 .67
.74 24 .72
.80 25 .78
.*4 26 .84
.68* 23 .67
.68 23 .67
.72 24 .72
.78 25 .78
.84 26 .84
.87 26 .84
.72 24 .72
.74 24 .72
.77 25 .78
.82 26 .84
.87 26 .84
.91 27 .91
.78 25 .78
.<yo 25 .78
.82 26 .84
.87 26 .84
.02 27 .91
.05 28 .98
Calculated Thickness
.51* .53* .57* .60* .64 .70 .77
21 ,. /Thickness Class
21 21 21 22 22 24 25
use \Thickness
.57 .57 .57 .62 .62 .72 .73
Calculated Thickness
.52 .54 .57 .61 .66 .72 .78
31 11 /Thickness Class
21 21 21 22 23 24 25
use \Tliickncss
.57 .57 .57 .62 .67 .72 .78
Calculated Thickness
.53 .56 .60
64 .60 .74 .0
5
T. /Thickness Class
21 21 22 22 23 24 25
\Thickness
.57 .57 .62 .62 .67 .72 .78
Calculated Thickness
.60 .62
65 .69 .73 .7^ ,1/3
8
i *a i Thickness Class
11 22 23 23 24 2 5 26
\Tliickness
.62 .62 .67 .67 .72 .73 .81
Calculated Thickness
,.65 .68 .71 74 .78 ,?2
5'7
12
f Thickness Class
23 23 n 24 25 26 26
Lse (Thickness
.67 .67 .72 72 .78 84 81
Calculated Thickness
.60 71 .74 .77 .81 ,?> 00
16 . T /Thickness Class 23 24 2 \ 25 26 20 17
\Tluckness
.67 .72 .72 .78 .84
34 .'){
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
12
CTD000254
TABLE 1-1 (Continued) Schedule of Barrel Thickness for Water Pipe of IS/40 Iron Strength
Laying Condi
tion
Depth ot
Cover
/*
Thickness Specifications
SO | IOO
Internal Pressure--psi 150 200 250
Barrel Thicknesses--in.
Twenty-four-inch Water Pipe
2i
Ji
5 A
8
12
16
Calculated Thickness r, I Thickness Class ^se (Thickness
Calculated Thickness - /Thickness Class
lThickness
Calculated Thickness i / Thickness Class Use \Thickness
Calculated Thickness .... /Thickness Class use (Thickness
Calculated Thickness r. /Thickness Class Lse (Thickness
Calculated Thickness i__ /Thickness Class bse \ Thickness
.69* 22 .68
69* 22 .68
.72* 23 .73
.SO 24 .79
.88 25 .85
.94 26 .92
.72* 23 .73
.71* 23 .73
.75* 23 .73
.82 25 .85
.91 26 .92
.97 27 .99
.75* 23 .73
.74* 23 .73
,7S* 24 .79
.86 25 .85
.94 26 .92
1.00 27 .99
.73* 24 .79
.73* 24 .79
.81* 24 .79
.90 26 .92
.93 27 .99
1.03 28
1.07
.82* 25 .85
.31* 24 .79
.85* 25 .85
.94 26 .92
1.02 27 .99
1.07 28
1.07
.86* 25 .85
.56 25 .85
.9/ 26 .92
.99 27 .99
1.06 28
1.07
1.11 28
1.07
.9/* 26 .92
.PJ 26 .92
.96 27 .99
1.04 28
1.07
1.10 28
1.07
1.15 29
1.16
a
5 B
8
12
16
Calculated Thickness fThickness Class
\Thickness
Calculated Thickness fT_* /Thickness Class
(Thickness
Calculated Thickness Use Thickness Class
(Thickness
Calculated Thickness .... /Thickness Class use (Thickness
Calculated Thickness /Thickness Class
^ (Thickness
Calculated Thickness tt__ /Thickness Class U3e (Thickness
.63* 21 .63
.62* 21 .63
.65* 21 .63
.72 23 .73
.79 24 .79
.85 25 .85
.65* 21 .63
.65* 21 .63
.67* 22 .68
.75 23 .73
.22 25 .85
.88 25 .85
.68* 22 .68
.62* 22 .68
.71* 23 .73
.79 24 .79
.86 25 .85
.91 26 .92
.72* 23 .73
.7/* 23 .73
.76 24 .79
,,yj 25 .85
.90 26 .92
.95 26 .92
.76* 24 .79
.77 24 .79
.81 24 .79
.88 25 8S
.94 26 .92
.99 27 .99
.82 25 .85
.84 25 .85
.88 25 .85
.94 26 .92
.99 27 .99
1.03 28
1.07
.90 26 .92
.91 26 .92
.94 26 .92
.99 27 .99
/.04 28
1.07
1.08 28
1.07
2i
3i 5 F 3
12
16
Calculated Thickness /Thickness Class
Lse (Thickness
Calculated Thickness r. /Thickness Class
(Thickness
/Calculated Thickness Thickness Class Lse (Thickness
. /Calculated Thickness - Thickness Class ^Thickness
Calculated Thickness
r /Thickness Class \Lse Thickness
Calculated Thickness
t- /Thickness Class \use Thickness
.56* 21 .63
.56* 21 .63
.59 21 .63
.66 22 .68
.72 23 .73
.77 24 .79
.58* 21 .63
.59 21 .63
.63 21 .63
.69 22 .68
.75 23 .73
.80 24 .79
.63* 21 .63
.63 21 .63
.67 22 .68
.73 23 73
.79 24 .79
.83 25 .85
.67* 22 .68
.69 22 .68
.72 23 .73
.77 24 .79
.33 25 .85
.87 25 .85
-7J 23 .73
.75 23 .73
.75 24 .79
.53 25 .85
.35 25 .85
.91 26 .92
.5/ .59 24 26 .79 .92
.82 .90 25 26 .85 .92
.54 .93 25 26 .85 .92
.50 .95 26 26 .92 9 2
.93 90 26 27 .92 99
.06 l 02 2 7 27 .99 .99
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case i) is the controlling factor. See Sec. 1-2.1.
13
CTD000255
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
p
Thickness Specifications
Internal Pressure--psi
50
100 | 150
200 | 250
300
Barrel Thicknesses--
Thirty-Inch Water Pipe
350
2!
31
5 A.
8
12
16
Calculated Thickness /Thickness Class Use \Thickness
Calculated Thickness i * /Thickness Class use \Thickness
Calculated Thickness ,, /Thickness Class Use \Thickness
Calculated Thickness r_ /Thickness Class Use \ Thickness
Calculated Thickness {mcknS 0353
Calculated Thickness /Thickness Class
Use (Thickness
.83* 23 .85
.82* 23 .85
.86* 23 .85
.94* 24 .92
1.0S 26
1.07
1.13 27
1.16
.86* 23 .85
.85* 23 .85
.90* 24 .92
.98 25 .99
1.08 26
1.07
1.17 27
1.16
SO* 24 .92
.89* 24 .92
.93* 24 .92
1.02 25 .99
1.12 27
1.16
1.20 27
1.16
.94* 24 .92
.93* 24 .92
.97* 25 .99
1.07 26
1.07
1.17 27
1.16
1.25 28
1.25
.98* 25 .99
.98* 25 .99
1.03 26
1.07
1.12 27
1.16
1.22 28
1.25
1.29 28
1.25
1.04* 26
1.07
1.04 26
1.07
1.10 26
1.07
1.19 27
1.16
1.28 28
1.25
1.35 29
1.35
1.10 26
1.07
1.12 27
1.16
1.18 27
1.10
1.25 28
1.25
/.JJ 29
1.35
1.40 29
1.35
21
31
5 B
8
12
16
Calculated Thickness rT__ /Thickness Class ^ \Thickncss
Calculated Thickness /Thickness Class
use (Thickness
Calculated Thickness rTo /Thickness Class use \Thickness
Calculated Thickness t/Thickness Class U8C \Thickness
Calculated Thickness /Thickness Class
u" (Thickness
Calculated Thickness tto- /Thickness Class
9e \Thickness
.74* 21 .73
.73* 21 .73
.77* 22 .79
.84 23 .85
.93 24 .92
1.00 25 .99
.77* 22 .79
.76* 22 .79
.80* 22 .79
.88 23 .85
.97 25 .99
1.04 26
1.07
.81* 22 .79
.80* 22 .79
.84* 23 .85
.93 24 .92
1.01 25 .99
1.08 26
1.07
.85* 23 .85
.85* 23 .85
.90 24 .92
.98 25 .99
1.06 26
1.07
1.13 27
1.16
.90* 24 .92
.92 24 .92
.97 25 .99
1.05 26
1.07
1.12 27
l 16
1.18 27
1.16
.99 25 .99
1.01 25 .99
1.05 26
1.07
1.11 26
1.07
1.18 27
1.16
1.24 28
1.25
1.09 26
1.07
1.10 26
1.07
/./J 27
1.16
1.18 27
1.16
1.25 28
1.25
1.30 29
1.35
Calculated Thickness
.66*
.70*
.74*
.79*
.88
.98 1.08
21 tt__ /Thickness Class
21 21 21 22 23 25 26
use \Thickness
.73 .73 .73 .79 .85 .99 1.07
Calculated Thickness
.66*
.70*
.74*
.80
.90 /.00 / /0
31
/Thickness Class
21 21 21 22 24 25 26
use \Thickness
.73 .73 .73 .79 .92 .99 1.07
5 F
8
12
Hi
Calculated Thickness T* /Thickness Class Lse \Thickness
Calculated Thickness { /Thickness Class
(Thickness
Calculated Thickness t' / Thickness Class
(Thickness
Ca culated Thickness t /Thickness Class U3C \Thickness
.70*
.73*
.79
.86
.93 1.01 1.11
21 21 22 23 24 25 26
.73 .73 .79 .35 .92 .99 1.07
.77 .81 .86 .93 1.00 1.07 1 15
22 22 23 24 25 26 21 .79 .79 .35 .92 .99 1.07 1.16
.85 .89 .04 .99 1.05 1.12 / 20 23 24 24 25 26 27 27 .85 .92 .92 .99 1.07 1.16 1.10
.91 .95 .99 1.04 1.10 1.16 /.JJ 24 24 25 26 26 27 .92 .92 .99 1.07 1.07 1.16 1.25
1 ____
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1J is the controlling factor, ~ee Sec. 1-2.L.
14 CTD000256
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
n
Thickness Specifications
Internal Pressure--psi
SO too 150 200 250 300 Barrel Thicknesses--in.
Thirty-six-Inch Water Pipe
350
21
31
5 A
8
12
i
Calculated Thickness {TM^Sclass
Calculated Thickness r-,,. (Thickness Class Use \Thickness
Calculated Thickness it.. /Thickness Class U8e (Thickness
Calculated Thickness I - j Thickness Class Lse (Thickness
Calculated Thickness .... /Thickness Class u,e (Thickness
Calculated Thickness it.. /Thickness Class use (Thickness
.94* 23 .94
.93* 23 .94
,98* 24 1.02
1.07* IS
1.10
1.19 26
1.19
1.29 27
1.29
.98* 24 1.02
.97* 23 .94
1.02* 24
1.02
i.u* 25
1.10
1.24 27
1.29
1.33 27
1.29
1.02* 24
1.02
1.02* 24
1.02
1.07* 25
1.10
1.16 26
1.19
1.28 27
1.29
1.38 28
1.39
1.07* 25
1.10
1.07* 25
1.10
1.12* 25
1.10
1J2 26
1.19
1.34 28
1.39
1.43 28
1.39
1.13* 25
1.10
1.12* 25
1.10
1.17* 26
1.19
1.28 27
1.29
1.40 28
1.39
1.49 29
1.50
1.19* 26
1.19
1.19 26
1.19
1.26 27
1.29
1.36 28
1-39
1.47 29
1.50
1.55 29
1.50
1.27 27
1.29
1.31 27
1.29
1.35 28
1.39
1.44 28
1.39
1.54 29
1.50
1.62 30
1.62
21
31
5
B
8
12
16
Calculated Thickness /Thickness Clan
Use (.Thickness
Calculated Thickness
{ESS0*"
Calculated Thickness it.- /Thickness Class U3e (Thickness
Calculated Thickness n.. /Thickness Class Use (Thickness
Calculated Thickness
it.. /Thickness Class use (Thickness
Calculated Thickness t_ /Thickness Class U8e 1 Thickness
.82* 21 .81
.81* 21 .81
.86* 22 .87
.94 23 .94
I.0S 24
1.02
1.12 25
1.10
.86* 22 .87
.83* 22 .87
.90* 22 .87
.99 24 1.02
1.09 25
1.10
1.17 26
1.19
.91* 23 .94
.90* 22 .87
.94* 23 .94
1.05 24
1.02
1.14 25
1.10
1.22 26
1.19
.97* 23 .94
.96* 23 .94
1.01 24
1.02
i.u 25
1.10
1.20 26
1.19
1.27 27
1.29
1.03* 24
1.02
1.04 24
1.02
1.10 25
1.10
1.18 26
1.19
1.27 27
1.29
1.34 28
1.39
1.14 25
1.10
1.15 26
1.19
1.20 26
1.19
1.27 27
1.29
1.34 28
1.39
1.40 28
1.39
1.26 27
l .29
1.28 27
1.29
1.30 27
1.29
1.36 28
1.39
1.43 28
1.39
1.48 29
1.50
21
31
5
F S
12
16
Calculated Thickness /Thickuess Class
use (Thickness
Calculated Thickness rt__ /Thickness Class Lse (Thickness
Calculated Thickness rt__ /Thickness Class
e (Thickness
Calculated Thickness r - . /Thickness Class Lse (Thickness
Calculated Thickness /Thickness Class (Thickness
Calculated Thickness it.. /Thickness Class
(Thickness
.73* 2! .81
.73* 21 .81
.78* 21 .81
.86 22 .87
.95 23 .94
/ 02
24 1.02
.79* 21 .81
.78* 21 .81
.82* 21 .81
.91 23 .94
1.00 24
1.02
1.07 25
1.10
.84* 22 .87
.83* 21 .81
.89 22 .87
.97 IS .94
1.06 25
1.10
1.12 25
1.10
.89 22 .87
.92 23 .94
.P7 23 .94
1.04 24
1.02
1.12 25
1.10
1.18 26
1.19
1.01 24
1.02
1.03 24
1.02
1.07 25
1.10
1.13 25
1.10
1.20 26
1.19
1.25 27
1.29
1.13 25
1.10
1.14 25
1.10
1.17 26
1.19
1.22 26
1.19
1.28 27
1.29
1.33 27
1.29
1.25 27
1.29
1.26 27
1.29
1.28 27
1.29
1.33 27
1.29
1.37 28
1.39
/ 42
28 1.39
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See Sec. 1-2.1.
15
CTD000257
TABLE 1-1 {Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
A
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thicknesses--in.
Forty-two-Inch Water Pipe
350
Calculated Thickness
1.04* 1.08* 1.14* 1.20* 1.27* 1.34* 1.43
21
(Thickness Class
23 23 24 25 26 26 27
use (Thickness
1.05 1.05 1.13 1.22 1.32 1.32 1.43
Calculated Thickness
1.04* 1.03* 1.14* 1.20* 1.27* 1.33 1.46
31
/Thickness Class
23 23 24 25 26 26 27
Lse (Thickness
1.05 1.05 1.13 1.22 1.32 1.32 1.43
Calculated Thickness
1.09* 1.14* 1.19* 1.25* 1.32* 1.43 1.52
5
Tr /Thickness Class
24 24 25 25 26 27 28
use \Thickness
1.13 1.13 1.22 1.22 1.32 1.43 1.54
Calculated Thickness
1.19* 1.24* 1.30 1.37 1.45 1.53 1.63
8
.... /Thickness Class
25 25 26 26 27 28 29
u" (Thickness
1.22
1.22
1.32
1-32
1.43
1.54
1.66
Calculated Thickness
1.33 1.33 1.44 1.50 1.53 1.65 1.74
12
it.~ /Thickness Class
26 27 27 28 28 29 30
use (Thickness
1.32
1.43
1.43
1.54
1.54
1.66
1.79L
Calculated Thickness
1.46 1.51 1.56 1.62 1.68 1.75 1.83
16
/Thickness Class
27 28 28 29 29 30 30
use (Thickness
1.43
1.54
1.54
1.66
1.66
1.79
1.79
21
31
5 u
8
12
16
Calculated Thickness ir.. /Thickness Class
(Thickness
Calculated Thickness .... /Thickness Class Use (Thickness
Calculated Thickness r /Thickness Class Use \ Thickness
Calculated Thickness .... /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness it-. /Thickness Class use \Thickness
.39* 21 .90
.39* 21 .90
.94* 22 .97
1.04 23
1.0S
1.15 24
1.13
1.25 25
1.22
.94* 22 .97
.94* 22 .97
.98* 22 .97
1.09 24
1.13
1.21 25
1.22
1.30 26
1.32
1.00* 22 .97
1.00* 22 .97
1.04* 23
1.05
1.16 24
1.13
1.27 26
1.32
1.36 26
1.32
1.07* 23
1.05
1.07* 23
1.05
1.13 24
1.13
1.23 25
1.22
1.33 26
1.32
1.43 27
1.43
1.14 24
1.13
1.17 24
1.13
1.23 25
1.22
1.32 26
1.32
1.42 27
1.43
1.50 28
1.54
1.23 26
1.32
1.30 26
1.32
/.J-4 26
1.32
1.42 27
1.43
1.51 28
1.54
1.53 28
1.54
1.42 27
1.43
1.43 27
1.43
1.47 27
1.43
1.53 28
1.54
1.60 29
1.66
1.67 29
1.66
Calculated Thickness
.30* .86* .92* 1.00 1.15 1.28 1.42
21 T /Thickness Class
21 21 21 22 24 26 27
use \Thickness
.90 .90 .90 .97 1.13 1.32 1.43
Calculated Tliickness
.30*
.86*
.92* 1.04
1.17
1.29
7.4J
31 tT,, /Thickness Class
21 21 21 23 24 26 27
use (Thickness
.90 .90 .90 1.05 1.13 1.32 1.43
Calculated Thickness
.85* .90* .98 1.08 1.19 1.32 1.15
5
fThickness Class
21 21 22 23 25 26 27
lj3e (Thickness
.90 .90 .97 1.05 1.22 1.32 1 43
Calculated Thickness
.94 1.00 1.08 1.16 1.26 1.36 1.49
8
i-_. /Thickness Class
22 22 23 24 15 26 23
Lse (Thickness
.97 .97 1.05 1.13 1.22 1.32 1 54
Calculated Thickness
1.05
1.10
1.17
1.25
1.34
7.43 /.5J
12
p /Thickness Class
23 24 24 25 26 27 28
^ (Tliickness
1.05 1.13 1.13 1.22 1.32 1.43 1.54
Calculated Thickness
1.13
1.18
1.24
1.32
1.40
1.49 7.50
16
j /Thickness Class e (Thickness
24 1.13
25 1.22
25 1.22
26 1.32
27 1.43
28 :? 1.54 i j4
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. Sec. 1-2.1.
16
-e
CTD000258
TABLE 1-1 (Continued)
Schedule of Barrel Thickness for Water Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300 | 350
Barrel Thicknesses--in.
Forty-eight-inch Water Pipe
Calculated Thickness
1.14* 1.19* 1.25* 1.32* 1.40* 1.49* 1.61
21 Use
Class
23 24 24 25 26 26 27
(Thickness
1.14
1.23
1.23
1.33
1.44
1.44
1.56
Calculated Thickness
1.14* 1.20* 1.26* 1J3* 1.40* 1.50 1.66
31 Use (ThfetoS C`a"
23 24 24 25 26 27 28
1.14
1.23
1.23
1.33
1.44
1.56
1.68
Calculated Thickness
1.22* 1.27* 1.32* 1.39* 1.47 1.58 1.71
5
.... / Thickness Class
24 24 25 26 26 27 28
Uae \ Thickness
1.23
1.23
1.33
1.44
1.44
1.56
1.68
Calculated Thickness
1J3* 1.38* 1.44
1.53
1.61
1.71
1.83
8
tt_ /Thickness Class
25 25 26 27 27 28 29
Use (Thickness .
1.33
1J3
1.44
1.56
1.56
1.68
1.81
Calculated Thickness
t.49 1.55 1.61 1.69 1.77 1.85 1.96
12
fT__ /Thickness Class
26 27 27 28 29 29 30
Use (Thickness
1.44
1.56 1.56
1.68
1.81
1.81
I.9S
Calculated Thickness
1.63 1.68 1.74 1.81 1.89 1.98 2.08
16
n.. /Thickness Class
28 28 28 29 30 30
use \Thickness
1.68 1.68 1.68 1.81 1.95 1.95
21
31
5 B
8
12
16
Calculated Thickness i'.. /Thickness Class
\Thickness
Calculated Thickness it.. /Thickness Class u,e \Thickness
Calculated Thickness t'.~ /Thickness Class
\ Thickness
Calculated Thickness m.. /Thickness Class u" \Thickness
Calculated Thicknesa .... /Thickness Class U" 1 Thickness
Calculated Thickness it.. /Thickness Class u,e \ Thickness
.97* 21 .98
,9S* 21 .98
1.03* 22
1.06
1.13 23
1.14
1.2S 25
1.33
1.33 25
1J3
1.03* 22
1.06
1.03* 22
1.06
1.09* 22
1.06
1.20 24
1.23
1.34 25
1.33
1.43 26
1.44
1.09* 22
1.06
1.10* 23
1.14
1.15* 23
1.14
1.28 25
1.33
1.41 26
1.44
1.50 27
1.56
1.17* 23
1.14
1.17 23
1.14
1.25 24
1.23
1.37 25
1.33
1.49 26
1.44
1.58 27
1.56
1.28 25
1.33
ui 25
1.33
1.37 25
1.33
1.47 26
1.44
1.58 27
1.56
1.67 28
1.68
1.43 26
1.44
1.45 26
1.44
1.50 27
1.56
1.58 27
1.56
1.69 28
1.68
1.77 29
1.81
1.59 27
1.56
1.61 27
1.56
1.65 28
1.68
1.72 28
1.68
1.80 29
1.81
1.87 29
1.81
Calculated Thickness
.38*
.93* 1.00* 1.12
1.27
1.43
1.59
2 i Cse /Thickness Class
21 21 21 23 24 26 27
\ Thickness
.98 .98 .98 1.14 1.23 1.44 1.56
Calculated Thickness
.88* .94* 1.01* 1.14 1.29 1.44 1.60
31 u{t{Ec,"
21 21 21 23 25 26 11
.98 .98 .98 1.14 1.33 1.44 1.56
Calculated Thickness
.93* .99* 1.08 1.20 7.JJ 1.48 1.63
5
{?!& Cta"
21 21 22 24 25 26 28 .98 .98 1.06 1.23 1.33 1.44 1.68
Calculated Thickness
1.03 1.10 1.19 1.28 1.40 1.52 1.67
8
rra, /Thickness Class
22 23 24 25 26 27 28
L3e (Thickness
1.06
1.14
1.23
1.33
1.44
1.56
1.68
Calculated Thickness
1.15
1.22
1.29
1.39
1.48
1.60
1.73
12
i. /Thickness Class
23 24 25 26 26 27 28
ose (Thickness
1.14 1.23 1.33 1.44 1.44 1.56 1.68
Calculated Thicknesa
1.25
1.31
1.38
1.46
1.56
1.67
1.75
16
/Thickness Class
24 25 25 26 27 28 29
Lse (Thickness
1.23 1.33 1.33 1.44 1.56 1.68 1.81
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
17
CTD000259
TABLE 1-2
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
SO | 100
Internal Pressure--psi
150 | 200
250
Barrel Thickness--**.
300
Three-Inch Water Pipe
Calculated Thickness
0.20* 0.20* 0.20* 0.20* 0.21* 0.21* 0.21
21
Tr /Thickness Class Use (.Thickness
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
Calculated Thickness
0.20* 0.20* 0.20* 0.21* 0.21* 0.22* 0.22
31
... /Thickness Class Use (Thickness
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
Calculated Thickness
0.21 0.21 0.21 0.22 0.22 0.23 0.23
5
/Thickness Class
22 22 22 22 22 22 22
Usc (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.22 0.23 0.23 0.23 0.24 0.24 0.25
8
TTm, /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.24 0.25 0.25 0.25 0.26 0.26 0.26
12
n,, /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32 ,
16
Calculated Thickness
0.26 0.26 0.27 0.27 0.27 0.28 0.28
/Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.19* 0.20* 0.20* 0.20* 0.21 0.22 0.22
21 Tm /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.19* 0.20* 0.20 0.21
0.21
0.22
0.22
31
TT,, /Thickness Class use (Thickness
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
22 0.32
Calculated Thickness
0.21 0.21 0.21 0.21 0.22 0.22 0.23
5
IT** /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.22 0.22 0.22 0.23 0.23 0.24 0.24
8
IT,,^ /Thickness Class
22 22 22 22 22 22 22
usc (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.24 0.24 0.24 0.25 0.25 0.25 0.26
12
TI,, /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.25
0.26
0.26 0.26 0.27
0.27
0.27
16
t /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.32
0.32
0.32
0.32
0.32
0.32
0.32
Calculated Thickness
0.19* 0.19* 0.19 0.20 0.20 0.21 0.22
2} tt_ /Thickness Class
22 22 22 22 22 22 22
e (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.19* 0.19
0.19
0.20 0.20 0.21
0.22
31 Tics. /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.19
0.20 0.20 0.21
0.21
0.22
0.22
5
r _ /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.32
0.32
0.32
0.32
0.32
0.32
0.32
Calculated Thickness
0.21
0.21
0.21
0.22
0.22
0.23
0.23
3
TT_. /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32
0.32
0.32
0.32
0.32
0.32
0.32
Calculated Thickness
0.22
0.22
0.23
0.23
0.24
0.24
0.25
12
IT /Thickness Class
22 22 22 22 22 22 22
(Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
Calculated Thickness
0.24 0.24 0.24 0.25 0.25 0.25 0.26
16
n0 /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.32 0.32 0.32 0.32 0.32 0.32 0.32
-
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case I) is the controlling factor. See
Sec. 1-2.1.
18
CTD000260
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
a
Thickness Specifications
Internal Pressure--psi SO 100 150 200 250 300
Barrel Thickness--in.
Four-Inch Water Pipe
350
Calculated Thickness
0.22* 0.23* 0.23* 0.24* 0.24* 0.25* 0.25*
21
T7,,,, /Thickness Class Use (Thickness
22 0.3S
22 0.35
22 0.35
22 0.35
22 O.J5
22 0.35
22 0.35
Calculated Thickness
0.22* 0.22* 0 23* 0.23* 0.24 0.25 0.26
31 it-- /Thickness Class 22 22 22 22 22 22 22
Use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.23* 0.23* 0M* 0.2t* 0.25 0.26 0.26
5
ti-- /Thickness Class
22 22 22 22 22 22 22
Use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.25 0.26 0.26 0.27 0.27 0.28 0 28
8
n-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0 35 0.35 0.35 0.35 0.35
Calculated Thickness
0.28 0.28 0.29 0.29 0.29 0.30 0.31
12
ii-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.30 0.30 0.31 0.31 0.32 0.32 0.33
16
ii-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.22* 0.22* 0.23* 0.23* 0.24* 0.24* 0.24
21 ii-- /Thickness Class 22 22 22 22 22 22 22
u" (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.22* 0.22* 0.22* 0.23* 0.24 0.24 0.25
31 it-- /Thickness Class 22 22 22 22 22 22 22
u" (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.22 0.23 0.23 0.24 0.25 0.25 0.26
5
ii-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.25 0.25 0.25 0.26 0.27 0.28 0.28
8
it-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.27
0.27
0.28 0.28
0.29
0.2$
0.30
12
it-- /Thickness Class
22 22 22 22 22 22 22
us* (Thickness P
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.29 0.29
0.30 0.30 0.31
0.31
0.32
16
it** /Thickness Class
22 22 22 22 22 22 22
U3t (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.21* 0.21* 0.21* 0.22* 0.23 0.24 0.25
21 n-- / Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.20* 0.21
0.21
0.22
0.23
0.24 0.25
31 ii-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.21
0.22
0.22
0.23
0.24
0.25
0.25
s
TT^ /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.23
0.24
0.24
0.25
0.25
0.26
0.27
8
ii-- /Thickness Class
22 22 22 22 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.25 0.26 0.26 0.27 0.27 0.28 0.28
12
/Thickness Class
22 22 22 22 22 22 22
usc (Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
Calculates Thickness
0.27
0.27
0.28 0.28 0.29
0.29
0.30
16
. /Thickness Class
22 22 22 22 22 22 22
u e (Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See Sec. 1-2.1.
19
CTD000261
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
u
Thickness Specifications
Internal Pressure-- 50 100 150 200 250 300
Barrel Thickness--in.
Six-Inch Water Pipe
350
Calculated Thickness
0.28* 0.28* 0.29* 0.30* 0.30* 0.31* 0.32*
n r- /Thickness Class 21 21 21 21 21 21 21
Use \ Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
Calculated Thickness
tr,, /Thickness Class L3e \ Thickness
0.27* 21
0.35
0.27*
21 0.35
0.28* 21
0.35
0.29* 21
0.35
0.29* 21
0.35
0.30* 21
0.35
0.32 21
0.J5
Calculated Thickness
0.28* 0.28* 0.29
0.30
0.31
0.32
0.33
5
.- /Thickness Class
21 21 21 21 21 21 21
Lse ( Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
A
Calculated Thickness
0.31
0.31
0.32 0.33
0.34 0.3S
0.36
8
/Thickness Class
21 21 21 21 21 21 21
u>e (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.34 0.35 0.36 0.36 0.37 0.38 0.39
12
re _ / Thickness Class
21 21 21 21 22 22 22
use (Thickness
0.35 0.35 0.35 0.35 0.38 0.38 0.38
Calculated Thickness
0.38
0.38
0.39
0.39
0.40
0.41
0.42
16
II(S- /Thickness Class
22 22 22 22 23 23 23
use \ Thickness
0.38 0.38 0.38 0.38 0.41 0.41 0.41
Y)-'
-n <
Calculated Thickness
0.27* 0.27* 0.28* 0.29* 0.29* 0.30* 0.31*
21 n-- /Thickness Class 21 21 21 21 21 21 21
U9C \Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
Calculated Thickness
0.26* 0.27* 0.27* 0.28* 0.29* 0.30 0.31
31 .r__ /Thickness Class 21 21 21 21 21 21 21
U3e (Thickness Calculated Thickness
0.35 0.27*
0.35 0.27*
0.35 0.28*
0.35 0.29
0.35 0.30
0.35 0.31
0.35 0.32
0i
5
/Thickness Class
21 21 21 21 21 21 21
Use \ Thickness
0.35 0.35 0.35 0.35 0.3S 0.35 0.J5
B
Calculated Thickness
0.30
0.30
0.31
0.32
0.33
0.34
0.35
8
... / Thickness Class
21 21 21 21 21 21 21
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.33 0.34 0.34 0.35 0.36 0.37 0.38
12
.... /Thickness Class
21 21 21 21 21 22 22
0 4L,se (Thickness
0.35 0.35 0.35 0.35 0.35 0.38 0.38
Calculated Thickness
0.36 0.37 0.37 0.38 0.39 0.39 0.40
16
.... /Thickness Class
21 22 22 22 22 22 23
use (Thickness
0.35 0.38 0.38 0.38 0.38 0.38 0.41
Calculated Thickness
0.25* 0.26* 0.26* 0.27* 0.28* 0.29* 0.30
21 . /Thickness Class 21 21 21 21 21 21 21
(Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.24* 0.25* 0.25 0.26 0.28 0.29 0.31
31 rt /Thickness Class
21 21 21 21 21 21 21
U3e \Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.25 0.26 0.27 0.28 0.29 0.30 0.31
5
i3 an /Thickness Class
21 21 21 21 21 21 21
L3e (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.28
0.28
0.29
0.30
0.31
0.32 0.33
8
i. /Thickness Class
21 21 21 21 21 21 21
U3e \ Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.31
0.31
0.32
0.33
0.34 0.34 0.35
12
. t /Thickness Class
21 21 21 21 21 21 21
\Thickness
0.35
0.35
0.35
0.35
0.35
0.35
0.35
Calculated Thickness
0.33
0.34
0.34
0.35
0.36
0.37
0.38
16
T- _ /Thickness Class
21 21 21 21 21 22 22
Use (Thickness
0.35
0.35
0.35
0.35
0.35
0.38 0.38
t1
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. Sec. t-2.1.
20
<11
CTD000262
4
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thickness--in.
Eight-Inch Water Pipe
Calculated Thickness
0.33* 0.33* 0.34* 0.35* 0.36* 0.37* 0.38*
2i , / Thickness Class 20 20 20 20 20 21 21
Use \ Thickness
0.35 0.35 0.35 0.35 0.3S 0.38 0.38
Calculated Thickness
0.32* 0.32* 0.33* 0.34* 0.35* 0.36* 0.38
3 i ... (Thickness Class 20 20 20 20 20 20 21
Uae (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.38
Calculated Thickness
0.32* 0.33* 0.34* 0.35 0.36 0.38 0.39
5
,/ Thickness Class
20 20 20 20 20 21 21
Use (Thickness
0.35 0.35 0.35 0.35 0.35 0.38 O.J8
Calculated Thickness
0.36 0.37 0.38 0.39 0.40 0.41 0.43
s
.... (Thickness Class
20 21 21 21 22 22 23
Use (Thickness
0.35 0.38 0.38 0.38 0.41 0.41 0.44
Calculated Thickness
0.41 0.42 0.43 0.44 0.45 0.46 0.47
12
.... /Thickness Class
22 22 23 23 23 24 24
Use (Thickness
0.41 0.41 0.44 0.44 0.44 0.48 0.48
Calculated Thickness
0,44 0.45 0.46 0.47 0.47 0.48 0.50
16
r. /Thickness Class
23 23 24 24 24 24 25
Use (Thickness
0.44 0.44 0.48 0.48 0.48 0.48 0.52
Calculated Thickness
0.31* 0.32* 0.33* 0.34* 0.35* 0.36* 0.37*
2i
.... (Thickness Class Use (Thickness
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
21 0.38
Calculated Thickness
0.30* 0.31* 0.32* 0.33* 0.34* 0.35 0.37
31
,. /Thickness Class Use (Thickness
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
21 0.38
Calculated Thickness
0.31* 0.32* 0.33 0.34 0.35 0.37 0.38
5
.... /Thickness Class
20 20 20 20 20 21
21
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.38 0.38
Calculated Thickness
0.35 0.35 0.36 0.37 0.39 0.40 0.41
8
i isa /Thickness Class
20 20 20 21 21 22 22
use (Thickness
0.35 0.35 0.35 0.38 0.38 0.41 0.41
Calculated Thickness
0.39 0.40 0.41 0.42 0.43 0.44 0.45
12
itTM /Thickness Class
21 22 22 22 23 23 23
Use (Thickness
0.38 0.41 0.41 0.41 0.44 0.44 0.44
Calculated Thickness
0.42 0.43 0.44 0.44 0.45 0.46 0.48
16
/Thickness Class
22 23 23 23 23 24 24
** (Thickness
0.41 0.44 0.44 0.44 0.44 0.48 0.48
Calculated Thickness
0.29* 0.30* 0.30* 0.31* 0.32* 0.34 0.36
21
. /Thickness Class Use (Thickness
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
20 0.35
Calculated Thickness
0.28* 0.29* 0.30* 0.31* 0.33 0.35 0.36
31 tT /Thickness Class 20 20 20 20 20 20 20
use (Thickness
0.35 0.35 0.35 0.35 0.35 0.35 0.35
Calculated Thickness
0.29* 0.30 0.31
0.32
0.34
0.36
0.37
5
.... /Thickness Class
20 20 20 20 20 20 21
use (Thickness
0.35 0.35 0.35 0.35 0.3S 0.35 0.38
Calculated Thickness
0.32 0.33 0.34 0.35 0.36 0.38 0.39
8
.. /Thickness Class
20 20 2(J 20 20 21 21
Uj>e (Thickness
0.35 0.35 0.35 0.35 0.35 0.38 0.38
Calculated Thickness
0.36 0.37
0.38 0.39
0.40
0.41
0.42
12
, - /Thickness Class
20 21 21 21 22 22 22
3 \ Thickness
0.35
0.38 0.33 0.38 0.41
0.41
0.41
Calculated Thickness
0.38
0.39
0.40
0.4t
0.42
0.43
0.44
16
,. /Thickness Class
21 21
22 22 23 23
Lie (Thickness
0.38 0 33 0.41 0.41 0.41 0.44 0.14
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling fact or When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor, bee
CTD000263
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi-
tion
Depth of
a
Thickness Specifications
Internal Pressure--psi 100 ISO 200 250 300
Barrel Thickness--in.
Ten-Inch Water Pipe
Calculated Thickness
0.38* 0.39* 0.40* 0.41* 0.42* 0.44* 0.45*
21
/Thickness Class
20 20 21 21 21 22 22
\ Thickness
0.38 0.38 0.41
0.41
0.41
0.44
0.44
Calculated Thickness
0.37* 0.38* 0.39* 0.40* 0.41* 0.43* 0.44
31 tt/Thickness Class 20 20 20 21 21 22 22
Uie \ Thickness
0.38 0.38 0.38 0.41 0.41 0.44 0.44
Calculated Thickness
0.33* 0.39* 0.40* 0.41 0.43 0.44 0.46
5
rt ,, /Thickness Class
20 20 21 21 22 22 23
U3e (Thickness
0.33 0.38
0.41
0.41
0.44
0.44
0.48
Calculated Thickness
0.42 0.44 0.45 0.46 0.47 0.49 0.51
8
IT,, /Thickness Class
21 22 22 23 23 23 24
Use (Thickness
0.41 0.44 0.44 0.48 0.48 0.48 0.52
Calculated Thickness
0.48 0.49
0.50 0.51
0.53
0.54
0.56
12
, /Thickness Class
23 23 24 24 24 25 25
Use (Thickness
0.48 0.48 0.52 0.52 0.52 0.56 0.56
Calculated Thickness
0.51 0.52 0.53 0.54 0.55 0.56 0.58
16
ir= /Thickness Class
24 24 24 25 25 2S 26
U3e (Thickness
0.52 0.52 0.52 0.56 0.56 0.56 0.60
21
31
5 u
8
12
16
Calculated Thickness r,, {Thickness Class use \ Thickness
Calculated Thickness it.. /Thickness Class use (Thickness
Calculated Thickness rTe_ /Thickness Class
\Thickness
Calculated Thickness i / Thickness Class Lse (Thickness
Calculated Thickness . / Thickness Class Use (Thickness
Calculated Thickness it,,. /Thickness Class use (Thickness
0.36* 20
0.38
0.35* 20
0.38
0.36* 20
0.38
0.40 21
0.41
0.46 23
0.48
0.48 23
0.48
0.37* 20
0.38
0.36* 20
0.38
0.37* 20
0.38
0.42 21
0.41
0.47 23
0.48
0.49 23
0.48
0.38* 20
0.38
0.37* 20
0.38
0.38* 20
0.38
0.43 22
0.44
0.48 23
0.48
0.50 24
0.52
0.39* 20
0.38
0.39* 20
0.38
0.40 21
0.41
0.44 22
0.44
0.49 23
0.43
0.51 24
0.52
0.41* 21
0.41
0.40* 21
0.41
0.41 21
0.41
0.46 23
0.48
0.50 24
0.52
0.52 24
0.52
0.42* 21
0.41
0.41 21
0.41
0.43 22
0.44
0.47 23
0.48
0.52 24
0.52
0.54 25
0.56
0.44* 22
0.44
0.44 22
0.44
0.46 23
0.18
0.49 23
0.48
0.53 24
0.52
0.55 25
0.56
2}
31
5 F
3
12
16
Calculated Thickness n-- /Thickness Class use (Thickness
Calculated Thickness /Thickness Class
use \Thickness
Calculated Thickness IT.,, /Thickness Class Uae \Thickness
Calculated Thickness rf- /Thickness Class Uae \Thickness
Calculated Thickness r- /Thickness Class
5 (Thickness
Calculated Thickness r -A / Thickness Class
b | Thickness
0.33* 20
0.33
0.33* 20
0.38
0.33* 20
0.38
0.37 20
0.38
0.42 21
0.41
0.44 22
0.44
0.34* 20
0.38
0.33* 20
0.38
0.34 20
0.38
0.38 20
0.38
0.43 22
0.44
0.45 22
0.44
0.35* 20
0.38
0.35* 20
0.38
0.36 20
0.38
0.40 21
0.41
0.44 22
0.44
0.46 23
0.48
0.37* 20
0.38
0.36* 20
0.38
0.38 20
0.38
0.41 2!
0.41
0.45 22
0.44
0.47 23
0.48
0.38* 20
0.38
0.38 20
0.38
0.40 21
0.41
0.43 22
0.44
0.47 23
0.48
0.48 23
0.48
0.40 21
0.41
0.40 21
0.41
0.42 21
0.41
0.45 22
0.44
0.48 23
0.48
0.50 24
0.52
0.43 22
0.44
0.43 22
0.44
0.44 22
0.44
0.47 23
0.43
0.50 24
0.52
0.52 24
0.52
* Asterisk following total calculated thickness indicates that truck superioad (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
22
CTD000264
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe cf 21/45 Iron Strength
Laying Condi
tion
Depth
of
Cover
n
Thickness Specifications
Internal Pressure--psi
so 100 150 200 250 300
Barrel Thickness--sm.
Twelve-Inch Water Pipe
350
21
Calculated Thickness
0.43* 0.44* 0.45* 0.47* 0.48* 0.49* 0.51*
*r /Thickness Class
21 21 21 22 22 22 23
use \Thickness
0.44 0.44 0.44 0.48 0.48 0.48 0.52
Calculated Thickness
0.42* 0.43* 0.44* 0.45* 0.47* 0.48* 0.50*
31 * t IT hickness C lass
20 21 21 21 22 22 23
[Thickness
0.41 0.44 0.44 0.44 0.48 0.48 0.52
Calculated Thickness
0.43* 0.44* 0.45* 0.46* 0.48 0.50 0.52
5
/Thickness Class
21 21 21 22 22 23 23
us* \Thickness
0.44 0.44 0.44 0.48 0.48 0.52 0.52
Calculated Thickness
0.48 0.49 0.50 0.52 0.54 0.55 0.57
8
,. . /Thickness Class
22 22 23 23 24 24 24
Use \ Thickness
0.48 0.48 0.52 0.52 0.56 0.56 0.56
Calculated Thickness
0.53 0.54 0.56 0.57 0.58 0.60 0.62
12
i/Thickness Class
23 24 24 24 25 25 25
use lThickness
0.52 0.56 0.56 0.56 0.60 0.60 0.60
Calculated Thickness
0.56 0.57 0.58 0.60 0.61 0.63 0.64
16
U* {?hicknes1C,aSS
24 24 25 25 25 26 26
0.56 0.56 0.60 0.60 0.60 0.65 0.65
Calculated Thickness
0.41* 0.42* 0.43* 0.44* 0.46* 0.47* 0.49*
21 .r,, /Thickness Class
20 20 21 21 22 22 22
u#e (Thickness
0.41 0.41 0.44 0.44 0.48 0.48 0.48
Calculated Thickness
0.39* 0.40* 0.42* 0.43* 0.45* 0.46* 0.49
31 n. /Thickness Class 20 20 20 21 21 22 22
Use (Thickness
0.41 0.41 0.41 0.44 0.44 0.48 0.48
Calculated Thickness
0.40* 0.41* 0.42* 0.44* 0.46 0.48 0.51
5
,To- /Thickness Class
20 20
20 21
22 22
23
96 (Thickness
0.41 0.41 0.41 0.44 0.48 0.48 0.52
B
Calculated Thicuess
0.45 0.46 0.48 0.49 0.51 0.53 0.55
8
Tr /Thickness Class
21 22 22 22 23 23 24
(Thickness
0.44 0.48 0.48 0.48 0.52 0.52 0.56
Calculated Thickness
0.50 0.51 0.52 0.54 0.56 0.57 0.59
12
/Thickness Class
23 23 23 24 24 24 25
Use (Thickness
0.52 0.52 0.52 0.56 0.56 0.56 0.60
Calculated Thickness
0.52 0.54 0.55 0.56 0.58 0.60 0.61
16
n,. /Thickness Class
23 24 24 24 25 25 25
U8e (Thickness
0.52 0.56 0.56 0.56 0.60 0.60 0.60
Calculated Thickness
0.37* 0.38* 0.39* 0.41* 0.42* 0.44* 0.48
21
/Thickness Class
20 20 20 20
20 21
22
U3e (Thickness
0.41 0.41 0.41 0.41 0.41 0.44 0.4S
Calculated Thickness
0.36* 0.37* 0.38* 0.40* 0.42 0.45 0.48
31 i* _ /Thickness Class 20 20 20 20 20 21 22
use [Thickness
0.41 0.41 0.41 0.41 0.41 0.44 0.48
Calculated Thickness
0.37* 0.38* 0.39* 0.42 0.44 0.47 0.49
5
Use (Thickness Class
20 20 20 20 21 22 22
(Thickness
0.41
0.41
0.41
0.41
0.44 0.48 0.48
Calculated Tjickness
0.41
0.43
0.44
0.46
0.48
0.50 0.53
8
T* /Thickness Class
20 21 21 22 22 23 23
L'se [Thickness
0.41 0.44 0.44 0.48 0.48 0.52 0.52
Calculated Thickness
0.45 0.47 0.48 0.50 0.52 0.54 0.56
12
* /Thickness Class
21 22 22 23 23 24 24
[Thickness
0.44 0.48 0.48 0.52 0.52 0.56 0.56
Calculated Thickness
0.48 0.49 0.50 0.52 0.54 0.55 0.57
16
.. /Thickness Class
22 22 23 23 24 24 24
Lse [Thickness
0.48 0.48 0.52 0.52 0.56 0.56 0.56
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
23
CTD000265
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying
Condi tion
Depth of
Thickness Specifications
Interna! Pressure--pri 50 100 150 200 250 300
Barrel Thickness--in.
Fourteen-Inch Water Pipe
350
Calculated Thickness
0.48* 0.50* 0.51* 0.53* 0.54* 0.56* 0.5S*
2) rr~ /ThicknessClass
21 22 22 23 23 23 24
U9C (Thickness
0.48 0.51
0.51
0.55
0.55
0.55
0.59
Calculated Thickness
0.47* 0.49* 0.50* 0.52* 0.53* 0.5S* 0.58
31
/ Thickness Class
21 21 22 22 23 23 24
Use (Thickness
0.48 0.48 0.51 0.51 0.55 0.55 0.59
Calculated Thickness
0.49* 0.51* 0.52* 0.53* 0.55* 0.58 0.60
5
i/Thickness Class
21 22 22 23 23 24 24
A
U3e \ Thickness
0.48 0.51 0.51 0.55 0.55 0.59 0.59
Calculated Thickness
0.55 0.56 0.58 0.60 0.62 0.64 0.66
8
it_ /Thickness Class
23 23 24 24 25 25 25
u,e (Thickness
0.55 0.55 0.59 0.59 0.64 0.64 0.64
Calculated Thickness
0.60 0.61 0.63 0.65 0.67 0.68 0.71
12
it.. /Thickness Class
24 24 2S 25 26 26 26
(Thickness
0.59 0.59 0.64 0.64 0.69 0.69 0.69
Calculated Thickness
0.63 0.65 0.66 0.68 0.69 0.71 0.73
16
it.. /Thickness Class
25 25 25 26 26 26 27
use (Thickness
0.64 0.64 0.64 0.69 0.69 0.69 0.75
21
31
5 B
8
12
16
Calculated Thickness /Thickness Class
u* (Thickness
Calculated Thickness /Thickness Class
use ( Thickness
Calculated Thickness ir* /Thickness Class use ( Thickness
Calculated Thickness i Tcu. / Thickness Class U3e (Thickness
Calculated Thickness it.. /Thickness Class use (Thickness
Calculated Thickness n.. /Thickness Class use (Thickness
0.45* 21
0.48
0.44* 21
0.48
0.46* 21
0.48
0.52 22
0.51
0.56 23
0.55
0.59 24
0.59
0.47* 21
0.48
0.46* 21
0.48
0.47* 21
0.48
0.53 23
0.55
0.57 24
0.59
0.60 24
0.59
0.48* 21
0.48
0.47* 21
0.48
0.49* 21
0.48
0.55 23
0.55
0.59 24
0.59
0.62 25
0.64
0.50* 22
0.51
0.49* 21
0.48
0.50 22
0.51
0.57 24
0.59
0.61 24
0.59
0.64 25
0.64
0.51* 22
0.51
0.51* 22
0.51
0.53 23
0.55
0.59 24
0.59
0.63 25
0.64
0.65 25
0.64
0.53* 23
o.ss
0.53 23
0.55
0.56 23
0.55
0.61 24
0.59
0.65 25
0.64
0.67 26
0.69
0.56* 23
0.55
0.57 24
0.59
0.59 24
0.59
0.64 25
0.64
0.67 26
0.69
0.70 26
0.69
Calculated Thickness
0.42* 0.43* 0.44* 0.46* 0.48* 0.51 0.55
21 nTM. /Thickness Class 21 21 21 21 21 22 23
use (Thickness
0.48 0.48 0.48 0.48 0.48 0.51 0.55
Calculated Thickness
0.41* 0.42* 0.44* 0.45* 0.48 0.52 0.56
3} M.. /Thickness Class 21 21 21 21 21 22 23
(Thickness
0.48 0.48 0.48 0.48 0.48 0.51 0.55
Calculated Thickness
0.42* 0.43* 0.45 0.48 0.51 0.54 0.57
5
n.. /Thickness Class
21 21 21 21 22 23 24
U3e (Thickness
0.48 0.48 0.48 0.48 0.51 0.55 0.59
F
Calculated Thickness
0.47 0.49 0.51 0.53 0.55 0.58 0.61
8
n,, /Thickness Class
21 21 22 23 23 24 24
use (Thickness
0.48 0.48 0.51 0.55 0.55 0.59 0.59
Calculated Thickness
0.51 0.53 0.54 0.56 0.59 0.61 0.63
12
n__ /Thickness Class
22 23 23 23 24 24 25
(Thickness
0.51
0.55
0.55
0.55 0.59
0.59
0.64
Calculated Thickness
0.54 0.55 0.57 0.59 0.61 0.63 0.65
16
r . / Thickness Class
23 23 24 24 24 25 25
^Thickness
0.55 0.55 0.59 0.59 0.59 0.64 0.64
Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See
Sec. 1-2.1.
24
rf0000266
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
it
Thickness Specifications
Internal Pressure--psi so 100 150 | 200 250 | 300
Barrel Thickness--in.
Sixteen-Inch Water Pipe
350
Calculated Thickness
0.52* 0.53* 0.55* 0.57* 0.59* 0.61* 0.63*
2i , / Thickness Class 22 22 22 23 23 24 24
L,se { Thickness
0.54 0.54 0.54 0.58 0.58 0.63 0.63
Calculated Thickness
0.51* 0.53* 0.54* 0.56* 0.58* 0.60* 0.63*
3i itTM /Thickness Class 21 22 22 23 23 23 24
Use {Thickness
0.50 0.54 0.54 0.58 0.58 0.58 0.63
Calculated Thickness
0.53* 0.55* 0.56* 0.58* 0.60* 0.63 0.66
5
/Thickness Class
22 22 23 23 23 24 25
Use {Thickness
0.54 0.54 0.58 0.58 0.58 0.63 0.68
Calculated Thickness
0.59 0.61 0.62 0.64 0.67 0.69 0.72
8
(TMcCk^ClaS3
23 24 24 24 25 25 26
0.58 0.63 0.63 0.63 0.68 0.68 0.73
Calculated Thickness
0.64 0.66 0.68 0.70 0.72 0.74 0.77
12
> . /Thickness Class
24 2S 25 25 26 26 27
use {Thickness
0.63 0.68 0.68 0.68 0.73 0.73 0.79
Calculated Thickness
0.68 0.70 0.71
0.73
0.75
0.77
0.80
16
it.. /Thickness Class
25 25 26 26 26 27 27
use {Thickness
0.68 0.68 0.73 0.73 0.73 0.79 0.79
Calculated Thickness
0.48* 0.50* 0.51* 0.53* 0.55* 0.58* 0.60*
2 *r /Thickness Class 21 21 21 22 22 23 23
usc (Thickness
0.50 0.50 0.50 0.54 0.54 0.58 0.58
Calculated Thickness
0.48* 0.49* 0.51* 0.53* 0.55* 0.57 0.61
3i .. /Thickness Class 21 21 21 22 22 23 24
Use \Thickness
0.50 0.50 0.50 0.54 0.54 0.58 0.63
5 II
8
Calculated Thickness /Thickness Class
U3e (.Thickness
Calculated Thickness tt,,- /Thickness Class Use {Thickness
0.49* 21
0.50
0.55 22
0.54
0.51* 21
0.50
0.57 23
0.58
0.53* 22
0.54
0.59 23
0.58
0.54 22
0.54
0.61 24
0.63
0.57 23
0.58
0.63 24
0.63
0.60 23
0.58
0.66 25
0.68
0.64 24
0.63
0.69 25
0.68
Calculated Thickness
0.60 0.62 0.63 0.65 0.68 0.70 0.73
12
.. /Thickness Class
23 24 24 24 25 25 26
{Thickness
0.58 0.63 0.63 0.63 0.68 0.68 0.73
Calculated Thickness
0.63 0.65 0.67 0.69 0.71 0.73 0.76
16
TT._ /Thickness Class
24 24 25 25 26 26 27
(Thickness
0.63 0.63 0.68 0.68 0.73 0.73 0.79
Calculated Thickness
0.44* 0.46* 0.47* 0.49* 0.52* 0.55 0.60
2* r. /Thickness Class 21 21 21 21 22 22 23
Lse (Thickness
0.50 0.50 0.50 0.50 0.54 0.54 0.58
Calculated Thickness
0.44* 0.45* 0.47* 0.49* 0.52 0.56 0.60
3|
. /Thickness Class Lse {Thickness
21 o.so
21 0.50
21 0.50
21 0.50
22 0.54
23 0.58
23 0.58
Calculated Thickness
0.45* 0.47* 0.49 0.52 0.55 0.58 0.62
5
tt - /Thickness Class
21 21 21 22 22 23 24
use (Thickness
0.50 0.50 0.50 0.54 0.54 0.58 0.63
Calculated Thickness
0.50 0.52 0.54 0.57 0.59 0.62 0.66
3
r. /Thickness Class
21 22 22 23 23 24 25
bse (Thickness
0.51
0.54
0.54
0.58 0.58 0.63
0.68
Calculated Thickness
0.55 0.56 0.58 0.61 0.63 0.66 0.69
12
,* /Thickness Class
22 23 23 24 24 25 25
3 (Thickness
0.54 0.58 0.58 0.63 0.63 0.68 0.68
Calculated Thickness
0.58 0.59 0.61
0.63
0.66 0.68 0.71
16
/Thickness Class
23 23 24 24 25 25 26
(Thickness
0.58 0.58 0.63 0.63 0.68 0.68 0.73
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. Sec Sec. 1-2.1.
25
CTD000267
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth
of Cover
ft
Thickness Specifications
Internal Pressure--pH 50 too 150 200 250 300
Barret Thickness--.
Eighteen-Inch Water Pipe
350
Calculated Thickness
0.56* 0.57* 0.59* 0.61* 0.63* 0.66* 0.68*
21 . . / Thickness Class 22 22 22 23 23 24 24
Lse (Thickness
0.58
0.58
0.58
0.63
0.63
0.68
0.68
Calculated Thickness
0.55* 0.57* 0.58* 0.60* 0.63* 0.65* 0.63
31 ,r /Thickness Class 21 22 22 22 23 23 24
use (Thickness
0.54
0.58
0.58
0.58
0.63
0.63
0.68
Calculated Thickness
0.57* 0.59* 0.61* 0.63* 0.65
0.68
0.72
5
n_ /Thickness Class
22 22 23 23 23 24 25
use (Thickness
0.58
0.58
0.63
0.63
0.63
0.68
0.73
Calculated Thickness
0.63* 0.65 0.67 0.69 0.72 0.75 0.78
8
.T- /Thickness Class
23 23 24 24 25 25 26
uae \Thickness
0.63
0.63
0.68
0.68
0.73
0.73
0.79
Calculated Thickness
0.69 0.71
0.73 0.75
0.78
0.80 0.83
12
n,, /Thickness Class
24 25 25 25 26 26 27
Use (Thickness
0.68
0.73
0.73
0.73
0.79
0.79
0.85
Calculated Thickness
0.73 0.75 0.77 0.79 0.82 0.84 0.87
16
TT,, /Thickness Class
25 2S 26 26 27 27 27
U5C \Thickness
0.73 0.73 0.79 0.79 0.85 0.85 0.85
Calculated Thickness
0.51* 0.53* 0.55* 0.57* 0.59* 0.62* 0.65
21 it.. /Thickness Class 21 21 21 22 22 23 23
U" (Thickness
0.54 0.54 0.54 0.58 0.58 0.63 0.63
Calculated Thickness
0.51* 0.53* 0.54* 0.56* 0.59* 0.62 0.67
31 it.. /Thickness Class
21 21 21 22 22 23 24
u" (Thickness
0.54
0.54
0.54
0.58
0.58
0.63
0.68
Calculated Thickness
0.53* 0.54* 0.56* 0.59
0.62
0.66
0.70
5
B
i(Thickness Class U9e (Thickness
21
0.54
21
0.54
22
0.58
22
0.58
23 0.63
24
0.68
24
0.68
Calculated Thickness
0.58
0.60
0.62
0.65
0.68
0.71
0.74
S
it-- /Thickness Class
22 22 23 23 24 25 25
u,e (Thickness
0.58
0.58
0.63
0.63
0.68
0.73
0.73
Calculated Thickness
0.64
0.66
0.68
0.70
0.73
0.76
0.79
12
it-- /Thickness Class
23 24 24 24 25 26 26
(Thickness
0.63
0.68
0.68
0.68
0.73
0.79
0.79
Calculated Thickness
0.68
0.70
0.72
0.74
0.76
0.79
0.82
16
Tt4. /Thickness Class
24 24 25 25 26 26 27
Use (Thickness
0.68
0.68
0.73
0.73
0.79
0.79
0.85
Calculated Thickness
0.47* 0.49* 0.50* 0.53* 0.55* 0.60 0.65
21
/Thickness Class
21 21 21 21 21 22 23
use (Thickness
0.54 0.54 0.54 0.54 0.54 0.58 0.63
Calculated Thickness
0.46* 0.48* 0.50* 0.52* 0.56
0.61
0.66
31 TTa /Thickness Class
21 21 21 21 22 23 24
Use \ Thickness
0.54 0.54 0.54 0.54 0.58 0.63 0.68
Calculated Thickness
0.48* 0.50* 0.52 0.56 0.59 0.63 0.6S
5
T/Thickness Class
21 21 21 22 22 23 24
U9e \Thickness
0.54
0.54
0.54
0.58
0.58
0.63
0.68
Calculated Thickness
0.54 0.56 0.58 0.61 0.64 0.67 0.71
8
rT._ /Thickness Class
21 22 22 23 23 24 25
\Thickness
0.54
0.58
0.58
0.63
0.63
0.68
0.73
Calculated Thickness
0.58
0.60
0.63
0.65
0.68
0.71
0.74
12
T-.. /Thickness Class
22 22 23 23 24 25 25
\ Thickness
0.58 0.58 0.63 0.63 0.63 0.73 0.73
Calculated Thickness
0.61
0.63
0.66
0.68
0.71
0.74
0.77
16
t/Thickness Class
23 23 24 24 25 25 26
Lse \Thickness
0.63
0.63
0.68
0.68
0.73
0.73
0.79
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1--2.1.
26
CTD000268
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--fs*
50
100
150
200
250
500
Barrel Thickness---'.
Twenty-Inch Water Pipe
350
Calculated Thickness
0.59* 0.61* 0.63* 0.65* 0.68* 0.71* 0.74*
2} U* {Thickness CIass 21 22 22 23 23 24 24
0.57 0.62 0.62 0.67 0.67 0.72 0.72
Calculated Thickness
0.59* 0.61* 0.63* 0.65* 0.68* 0.70* 0.73*
31
/Thickness Class
21 22 22 23 23 24 24
use (Thickness
0.57 0.62 0.62 0.67 0.67 0.72 0.72
5 \
Calculated Thickness /Thickness Class
c,e (Thickness
0.62*
22
0.62
0.64*
22
0.62
0.65* 23
0.67
0.67*
23 0.67
0.70* 24
0.72
0.73 24
0.72
0.77 25
0.78
Calculated Thickness
0.67* 0.69 0.71 0.74 0.77 0.80 0.83
8
!_, /Thickness Class
23 23 24 24 25 25 26
vx (Thickness
0.67 0.67 0.72 0.72 0.78 0.78 0.84
Calculated Thickness
0.74
0.76
0.78
0.80
0.83
0.86
0.89
12
it.. /Thickness Class
24 25 25 25 26 26 27
Use (Thickness
0.72 0.78 0.78 0.78 0.84 0.84 0.91
16
Calculated Thickness
0.78 0.80 0.83 0.85 0.87 0.90 0.93
it.. /Thickness Class
25 2S 26 26 26 27 27
use (Thickness
0.78 0.78 0.84 0.84 0.84 0.91 0.91
Calculated Thickness
0.55* 0.56* 0.58* 0.61* 0.63* 0.66* 0.70*
21 i iu / Thickness Class 21 21 21 22 22 23 24
Use (Thickness
0.57 0.57 0.57 0.62 0.67 0.67 0.72
Calculated Thickness
0.54* 0.56* 0.58* 0.60* 0.63* 0.66* 0.71*
31 ,, /Thickness Class 21 21 21 22 22 23 24
use (Thickness
0.57 0.57 0.57 0.62 0.62 0.67 0.72
Calculated Thickness
0.57* 0.58* 0.60* 0.63* 0.66 0.70 0.74
5 B
it.. /Thickness Class use (Thickness
21
0.57
21
0.57
22
0.62
22
0.62
23 0.67
24 0.72
24 0.72
Calculated Thickness
0.62
0.64
0.66
0.69
0.72
0.76
0.79
8
, /Thickness Class
22 22 23 23 24 24 25
Use (Thickness
0.62 0.62 0.67 0.67 0.72 0.78 0.78
Calculated Thickness
0.68
0.70
0.72
0.75
0.77
0.81
0.84
12
Ir,, /Thickness Class
23 24 24 25 25 26 26
u** (Thickness
0.67 0.72 0.72 0.78 0.78 0.84 0.84
Calculated Thickness
0.72
0.74
0.76
0.78 0.81
0.84 0.87
16
iUis.e. /(TThhiicckknneessss Class
24 0.72
24 0.72
25 0.78
25 0.78
25 0.84
26 0.84
26 0.84
Calculated Thickness
0.50* 0.52* 0.54* 0.56* 0.59* 0.64 0.69
21 ,, /Thickness Class 21 21 21 21 21 22 23
Use (Thickness
0.57
0.57
0.57
0.57
0.57
0.62
0.67
Calculated Thickness
0.49* 0.51* 0.53* 0.56* 0.60 0.65 0.70
31 IT_ /Thickness Class 21 21 21 21 22 23 24
use \Thickness
0.57 0.57 0.57 0.57 0.62 0,67 0.72
Calculated Thickness
0.51* 0.53 0.55 0.59 0.63 0.67 0.72
5
r* - /Thickness Class
21 21 21 21 22 23 24
bse (Thickness
0.57
0.57
0.57
0.57
0.62
0.67
0.72
Calculated Thickness
0.56
0.59
0.61
0.64
0.68
0.72
0.76
3
/Thickness Class
21 21 22 22 23 24 25
use (Thickness
0.57
0.57
0.62
0.62
0.67
0.72
0.78
Calculated Thickness
0.61
0.64
0.66
0.69
0.72
0.75
0.79
12
ir.* /Thickness Class
22 22 23 23 24 25 25
usc \Thickness
0.62
0.62
0.67
0.67
0.72
0.78
0.78
Calculated Thickness
0.65
0.67
0.70
0.72
0.75
0.78
0.82
16
... /Thickness Class
23 23 24 24 25 25 26
L3e (Thickness
0.67 0.67 0.72 0.72 0.78 0.78 0.84
* Asterisk following total calculated thickness indicates that truck supertoad (Case 2 )ia the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case 1) is the controlling factor. See Sec. 1-2.1,
27
CTD000269
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi*
tion
Depth of
Cover
it
Thickness Specifications
Internal Pressure--psi SO 100 ISO 200 2S0 300
Barrel Thickness--in.
Twenty-four-inch Water Pipe
350
Calculated Thickness
0.66* 0.68* 0.71* 0.73* 0.76* 0.80* 0.84*
2}
T. /Thickness Class Use \Thickness
22 0.68
22 0.68
23 0.73
23 0.73
24 0.79
24 0.79
25 0.85
Calculated Thickness
0.66* 0.68* 0.70* 0.73* 0.76* 0.79* 0.83*
31 ,r / Thickness Class
22 22 22 23 24 24 25
u,e (Thickness
0.68
0.68
0.68
0.73
0.79
0.79
0.85
Calculated Thickness
0.69* 0.71* 0.74* 0.76* 0.79* 0.83
0.88
S
tj_ /Thickness Class
22 23 23 24 24 25 25
U3e (Thickness
0.68
0.73
0.73
0.79
0.79
0.85
0.85
Calculated Thickness
0.7S* 0.77 0.80 0.83 0.87 0.91 0.95
S
rI,, /Thickness Class
23 24 24 25 25 26 26
u,e (Thickness
0.73
0.79
0.79
0.8S
0.8S
0.92
0.92
Calculated Thickness
0.83
0.85
0.88
0.91
0.94
0.98
1.01
12
/Thickness Class
25 25 25 26 26 27 27
Use ( Thickness
0.85 0.85 0.85 0.92 0.92 0.99 0.99
Calculated Thickness
0.89 0.91
0.94 0.96 0.99
1.03
1.06
16
/Thickness Class
26 26 26 27 27 28 28
U" 1 Thickness
0.92 0.92 0.92 0.99 0.99
1.07
1.07
Calculated Thickness
0.60* 0.62* 0.65* 0.67* 0.71* 0.74* 0.80
21 fr_ /Thickness Class 21 21 21 22 23 23 24
Usc \Thickness
0.63
0.63
0.68
0.68
0.73
0.73
0.79
Calculated Thickness
0.59* 0.62* 0.64* 0.67* 0.70* 0.75 0.81
31 .. /Thickness Class 21 21 21 22 22 23 24
Use (Thicknesa
0.63
0.63
0.63
0.68
0.68
0.73
0.79
Calculated Thickness
0.62* 0.65* 0.67* 0.70 0.74 0.79 0.85
5
/Thickness Class
21 21 22 22 23 24 25
** (Thickness
0.63
0.63
0.68
0.68
0.73
0.79
0.85
Calculated Thickness
0.68
0.71
0.74
0.77
0.81
0.85
0.90
u* {^SCla"s 22 23 23 24 24 25 26
0.68
0.73
0.73
0.79
0.79
0.85
0.92
Calculated Thickness
0.75
0.78 0.80 0.83
0.87
0.91
0.95
12
n-- /Thickness Class
23 24 24 25 25 26 26
u" (Thickness
0.73
0.79
0.79 0.85
0.85
0.92
0.92
Calculated Thickness
0.80 0.82
0.85
0.88
0.91
0.95
0.99
16
i. . /Thickness Class
24 25 25 25 26 26 27
Lse (Thickness
0.79 0.85 0.85 0.85 0.92 0.92 0.99
Calculated Thickness
0.54* 0.57* 0.59* 0.62* 0.66* 0.72
0.79
21 it.. /Thickness Class 21 21 21 21 22 23 24
Use (Thickness
0.63
0.62
0.63
0.63
0.68
0.73
0.79
Calculated Thickness
0.54* 0.56* 0.59* 0.62* 0.67
0.73 0.80
31 r| _ /Thickness Class 21 21 21 21 22 23 24
Use \Thickness
0.63
0.63
0.63
0.63
0.68
0.72
0.79
Calculated Thickness
0.57* 0.59* 0.62
0.66
0.71
0.76 0.82
5
t * /Thickness Class
21 21 21 22 23 24 25
use [ Thickness
0.63 0.63 0.63 0.68 0.73 0.79 0.S5
Calculated Thickness
0.62 0.6S 0.68 0.72 0.76 0.81 0.86
8
i /Thickness Class
21 21 22 23 24 24 25
Lse \Thickness
0.63
0.63
0.68 0.73
0.79
0.79
0.S5
Calculated Thickness
0.68 0.71 0.74 0.77 0.81 0.85 0.90
12
i'_ /Thickness Class
22 23 23 24 24 25 26
\ Thickness
0.68 0.73 0.73 0.79 0.79 0.85 0.92
Calculated Thickness
0.72
0.75
0.78
0.81
0.85
0.89
0.93
16
r- /Thickness Class
23 23 24 24 25 25 2ft
\Thickneas
0.73
0.73
0.79
0.79
0.S5
0.92
0.92
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case I) is the controlling factor. Sec. 1-2.1.
2S
CTD000270
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
//
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thickness--in.
Thirty-Inch Water Pipe
Calculated Thickness
0.79* 0.81* 0.84* 0.88* 0.92* 0.96* 1.01*
21
(Thickness Class
22 22 23 23 24 25 25
use /Thickness
0.79 0.79 0.85 0.85 0.92 0.99 0.99
Calculated Thickness
0.78* 0.81* 0.84* 0.87* 0.91* 0.9S* 1.00
31 ... /Thickness Class 22 22 23 23 24 24 25
Use /Thickness
0.79 0.79 0.85 0.85 0.92 0.92 0.99
Calculated Thickness
0.82* 0.85* 0.88* 0.91* 0.94
1.00
1.06
5
/Thickness Class
23 23 23 24 24 25 26
use /Thickness
0.85 0.85 0.85 0.92 0.92 0.99 l.Oi
Calculated Thickness
0.89* 0.92 0.95 0.99 1.04 1.09 1.14
S
.I,. /Thickness Class
24 24 24 25 26 26 27
ose /Thickness
0.92 0.92
0.92
0.99
1.07
1.07
1.16
Calculated Thickness
0.99
1.02
1.05
1.09
1.13
1.17
1.22
12
.... /Thickness Class
25 25 26 26 27 27 28
Lse /Thickness
0.99 0.99
1.07
1.07
1.16
1.16
1.25
Calculated Thickness
1.06
1.09
1.12
1.16
1.20
1.24
1.29
16
r /Thickness Class
26 26 27 27 27 28 25
Use tThickness
1.07
1.07
1.16
1.16
1.16
1.25
1.29
Calculated Thickness
0.70* 0.73* 0.76* 0.80* 0.84* 0.89* 0.88
21 , / Thickness Class
20 21 22 22 23 24 25
Lse /Thickness
0.68
0.73
0.79
0.79
0.85
0.92
0.99
Calculated Thickness
0.69* 0.72* 0.75* 0.79* 0.83* 0.90 0.98
31
.... /Thickness Class Uae /Thickness
20 0.68
21
0.73
21
0.73
22
0.79
23 0.85
24 0.92
25 0.99
Calculated Thickness
0.73* 0.76* 0.79* 0.83* 0.88 0.95
1.02
5
t. /Thickness Class
21 22 22 23 23 24 25
Use /Thickness
0.73 0.79 0.79 0,85 0.85 0.92 0.99
B
Calculated Thickness
0.79
0.83
0.86
0.91
0.96
1.01
1.07
8
.... /Thickness Class
22 23 23 24 25 25 26
Use /Thickness
0.79 0.85 0.85
0.92 0.99
0.99
1.07
Calculated Thickness
0.88
0.91
0.95
0.99
1.03
1.08
1.14
12
/Thickness Class
23 24 24 25 26 26 27
u,e /Thickness
0.85 0.92 0.92 0.99
1.07
1.07
1.16
Calculated Thickness
0.94 0.97
1.01
1.05
1.09
1.13
1.18
16
,r /Thickness Class
24 25 25 26 26 27 27
use 1 Thickness
0.92 0.99
0.99
1.07
1.07
1.16
1.16
Calculated Thickness
0.64* 0.67* 0.70* 0.74* 0.79* 0.87 0.96
21
* _ /Thickness class Uae \Thickness
20 0.68
20 0.68
20 0.68
21
0.73
22
0.79
23 0.85
25 0.99
Calculated Thickness
0.63* 0.66* 0.69* 0.73* 0.81
0.88
0.97
31
/Thickness Class
20 20 20 21 22 23 25
Use /Thickness
0.68
0.68
0.68
0.73
0.79
0.85
0.99
Calculated Thickness
0.66* 0.69* 0.73
0.78
0.85
0.92
0.99
5
i' . /Thickness Class
20 20 21 22 23 24 25
Lse /Thickness
0.68
0.68
0.73
0.79
0.85
0.92
0.99
Calculated Thickness
0.72 0.76 0.80 0.85 0.90 0.96
1.03
8
/ Thickness Class
21 22 22 23 24 25
26
Lse /Thickness
0.73 0.79 0.79 0.85 0.92 0.99
1.07
Calculated Thickness
0.80
0.84
0.87
0.91
0.96
1.02
1.08
12
i- a /Thickness Class
22 23 23 24 25 25
26
Lse /Thickness
0.79 0.85 0.85 0.92 0.99 0.99
1.07
Calculated Thickness
0.85 0.89 0.92 0.96 1.01 1.06 1.12
16
/Thickness Class
23 24 24 25 25 26 27
(Thickness
0.85 0.92 C.92 0.99 0.99 1.07 1.91
* Asterisk following total calculated thickness indicates that truck superload {Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, surge pressure (Case l) is the controlling factor. See Sec. 1-2.1.
29
CTD000271
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover ft
Thickness Specifications
Internal Pressure--psi 50 100 150 200 250 300
Barrel Thickness--in.
Thirty-six-Inch Water Pipe
Calculated Thickness
0.89* 0.92* 0.96* 1.00* 1.05* 1.10* 1.16*
21 . 1 Thickness Class
22 23 23 24 24 25 26
Use (Thickness
0.87 0.94 0.94
1.02
1.02
1.10
1.19
Calculated Thickness
0.88* 0.92* 0.95* 1.00* 1.04* 1.10* 1.15
31 ir,, /Thickness Class 22 23 23 24 24 25 26
use (Thickness
0.87
0.94
0.94
1.02
1.02
1.10
1.19
Calculated Thickness
0.93* 0.96* 1.00* 1.04* 1.09* 1.14
1.22
5
iUia.e. (/TThhiicckknneessss Class
23 0.94
23 0.94
24
1.02
24
1.02
25 M0
25
1.10
26 1.19
Calculated Thickness
l.ot* 1.04* 1.08
1.13
1.18
1.24
1.31
8
ir_ /Thickness Class
24 24 25 25 26 27 27
Use (Thickness
1.02
1.02
1.10
1.10
1.19
1.29
1.29
Calculated Thickness
1.13
1.16
1.20
1.25
1.30
1.35
1.41
12
/Thickness Class
25 26 26 27 27 28 28
u" (Thickness
1.10
1.19
1.19
1.29
1.29
1.39
1.39
Calculated Thickness
1.22
1.25
1.29
1.33
1.38
1.43
1.48
16
, /Thickness Class
26 27 27 27 28 28 29
Use (Thickness
1.19
1.29
1.29
1.29
1.39
1.39
1.50
21 Calculated Thickness /Thickness Class
0.78*
21
0.81*
21
0.85*
22
0.90*
22
0.95* 23
1.01* 24
1.12
25
Use (Thickness
0.81
0.81
0.87 0.87
0.94
1.02
1.10
Calculated Thickness
0.77* 0.81* 0.85* 0.89* 0.95* 1.03
1.12
31
/Thickness Class
20 21 22 22 23 24 25
Use (Thickness
0.75
0.81
0.87
0.87
0.94
1.02
1.10
5 B
8
Calculated Thickness Use /Thickness Class
\Thickness
Calculated Thickness /Thickness Class
Use (Thickness
0.81*
21
.81
0.88 22
0.87
0.85*
22
.87
0.92 23
0.94
0.89*
22
.87
0.97 23
0.94
0.93* 23 .94
1.02
24
1.02
1.00
24
1.02
1.08 25
1.10
1.08 25
1.10
1.15 26
1.19
1.16 26
1.19
1.22
26 1.19
Calculated Thickness
0.99
1.02
1.07
1.12
1.17
1.23
1.30
12
i.,, /Thickness Class
24 24 25 25 26 26 27
use (Thickness
1.02
1.02
1.10
1.10
1.19
1.19
1.29
Calculated Thickness
1.06
1.10
1.14
1.19
1.24
1.29
1.35
16 t / Thickness Class 25 25 25 26 27 27 23
bse (Thickness
M0
1.10
1.10
1.19
1.29
1.29
1.39
2 21Calculated Thickness
0.71* 0.74* 0.78* 0.83* 0.90
1.00
1.10
} ** /Thickness Class 20 20
21 22 24 25
ose \Thickness
0.75 0.75 0.81
0.81
0.87
1.02
1.10
21Calculated Thickness
0.70* 0.74* 0.78* 0.83 0.92
1.01
l.ll
31 /Thickness Class
20 20
21 23 24 25
Lse (Thickness
0.75
0.75
0.81
0.81
0.94
1.02
1.10
22Calculated Thickness
0.74* 0.77* 0.82
0.88
0.96
1.05
1.14
5
/Thickness Class
20 20 21
23 24 25
L3e \ Thickness
0.75
0.75
0.81
0.87
0.94
1.02
1.10
22 22Calculated Thickness
0.81
0.85
0.90 0.96
1.02
1.10
1.18
& r- /Thickens Class 21
23 24 25 26
a (Thickness
0.81
0.87
0.87 0.94
1.02
1.10
1.19
22Calculated Thickness
0.90 0.94 0.98 1.04 1.09 1.16 1.23
12 r /Thickness Class
23 24 24 25 26 26
(Thickness
0.87
0.94
1.02
1.02
1.10
1.19
1.19
Calculated Thickness
0.96
1.00
1.04
1.09
1.15
1.21
1.28
16
1- /Thickness Class
23 24 24 25 26 26 27
3 \ Thickness
0.94
1.02
1.02
1.10
1.19
1.19
1.29
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor When total calculated thickness is not followed by asterisk* surge pressure (Case l) is the controlling factor. See 3ec. 1-2.1.
30
CTD000272
TABLE 1-2 (Continued)
Schedule oj Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi-
Depth of
Cover
n
Thickness Specifications
Internal Pressure--psi so 100 150 200 250 300
Barrel Thickness--.
Forty-two-inch Water Pipe
350
Calculated Thickness
0.99* 1.02* 1.07* 1.12* 1.17* 1.24* 1.31*
2!
(Thickness Class
22 23 23 24 24 25 26
U3e (Thickness
0.97
1.05
1.05
1.13
1.13
1.22
1.32
Calculated Thickness
0.99* 1.02* 1.07* 1.12* 1.17* 1.24* 1.30
3J TU_ /Thickness Class
22 23 23 24 24 25 26
use \ Thickness
0.97
1.05
1.05
1.13
1.13
1.22
1.32
Calculated Thickness
1.04* 1.08* 1.12* 1.17* 1.22* 1.28* 1.37
5
ir-- /Thickness Class
23 23 24 24 25 26 26
Use (Thickness
1.05
1.05
1.13
1.13
1.22
1.32
1.32
Calculated Thickness
1.13* 1.17* 1.21
1.27
1.33
1.40
1.48
8
/Thickness Class
24 24 25 26 26 27 27
use (Thickness
1.13
1.13
1.22
1.32
1.32
1.43
1.43
Calculated Thickness
1.26
1.30
1.35
1.40
1.46
1.52
1.59
12
/Thickness Class
25 26 26 27 27 28 28
use (Thickness
1.22
1.32
1.32
1.43
1.43
1.54
1.54
Calculated Thickness
1.37
1.41
1.46
1.51
1.56
1.62
1.68
16
/Thickness Class
26 27 27 28 28 29 29
Lse (Thickness
1.32
1.43
1.43
1.54
1.54
1.66
1.66
Calculated Thickness
0.85* 0.89* 0.94* 0.99* 1.05* 1.13
1.25
21 .... /Thickness Class 20 21 22 22 23 24 25
use (Thickness
0.83 0.90 0.97
0.97
1.05
1.13
1.22
Calculated Thickness
0.85* 0.89* 0.94* 0.99* 1.05
1.15
1.27
31 ,/Thickness Class 20 21 22 22 23 24 26
U3e (Thickness
0.83 0.90 0.97
0.97
1.05
1.13
1.32
Calculated Thickness
0.89* 0.93* 0.98* 1.03* l.ll 1.21 1.31
5
/Thickness Class
21 21 22 23 24 25 26
Use (Thickness
0.90 0.90 0.97
1.05
1.13
1.22
1.32
B
Calculated Thickness
0.97
1.02
1.07
1.13
1.21
1.29
1.37
8
U* {TMcne ClaS3
22 23 23 24 25 26 26
0.97
1.05
1.05
1.13
1.22
1.32
1.32
Calculated Thickness
1.09
1.13
1.18
1.24
1.30
1.38
1.45
12
/Thickness Class
24 24 25 25 26 27 27
use (Thickness
1.13
1.13
1.22
1.22
1.32
1.43
1.43
Calculated Thickness
1.18
1.22
1.27
1.32
1.38
1.45
1.52
16
u* {TMSclas3
25
1.22
25
1.22
26 1.32
26 1.32
27 1.43
27 1.43
28 1.54
Calculated Thickness
0.77* 0.81* 0.86* 0.92* 1.00
1.12
1.24
21
tUts-es. /(TThhiicckknneessss Class
20
0.83
20
0.83
20
0.83
21
0.90
22
0.97
24 1.13
25
1.22
Calculated Thickness
0.77* 0.81* 0.86* 0.92* 1.02
1.14
1.25
31 r _ /Thickness Class
20 20 20 21 23 24 25
Lse (Thickness
0.83
0.83
0.83
0.90
1.05
1.13
1.2 2
Calculated Thickness
0.81* 0.85* 0.90 0.98
1.07
1.17
1.28
5
/Thickness Class
20 20 21 22 23 24 26
U9e (Thickness
0.83
0.83
0.90
0.97
1.05
1.13
1.32
Calculated Thickness
0.89 0.94 0.99
1.06
1.14
1.23
1.33
8
ie /Thickness Class
21 22 22 23 24 25 26
use (Thickness
0.90 0.97 0.97
1.05
1.13
1.22
1.32
Calculated Thickness
0.99
1.03
1.09
1.15
1.22
1.30
1.39
12
r * /Thickness Class
22 23 24 24 25 26 27
Lse (Thickness
0.97 1.05 1.13 1.13 1.22 1.32 1.43
Calculated Thickness
1.07 l.ll 1.16 1.21 1.28 1.36 1.44
16
/Thickness Class
23 24 24 25 26 26 27
(Thickness
1.05 1.13 1.13 1.22 1.32 1.32 1.43
* Asterisk following total calculated thickness indicates that truck superload (Case 2) is the controlling factor. When total calculated thickness is not followed by asterisk, 3urge pressure (Case 1) is the controlling factor. See Sec. 1-2.1.
31
CTD000273
TABLE 1-2 (Continued)
Schedule of Barrel Thickness for Water Pipe of 21/45 Iron Strength
Laying Condi
tion
Depth of
Cover
n
Thickness Specifications
Internal Pressure--psi
50
100
150
200
250
Barrel Thickness--<.
Forty-eight-inch Water Pipe
300
350
Calculated Thickness
1.08* 1.12* 1.17* 1.23* 1.29* 1.37* 1.45*
2i
/Thickness Class
22 23 23 24 25 25 26
L3e /Thickness
1.06
1.14
1.14
1.23
1.33
1.33
1.44
Calculated Thickness
1.09* 1.13* 1.18* 1.24* 1.30* 1.37* 1.46
3i
/Thickness Class
22 23 23 24 25 2S 26
use \Thickness
1.06
1.14
1.14
1.23
1.33
1.33
1.44
Calculated Thickness
1.15* 1.19* 1.24* 1.30* 1.36* 1.43
1.53
5
i'.. /Thickness Class
23 24 24 25 25 26 27
use /Thickness
1.14
1.23
1.23
1.33
1.33
1.44
1.56
Calculated Thickness
1.25* 1.29* 1.34
1.41
1.48
1.56
1.65
8
. /Thickness Class
24 25 25 26 26 27 28
Lse /Thickness
i1.2
1.33
1.33
1.44
1.44
1.56
1.68
Calculated Thickness
1.41 1.45 1.51 1.57 1.63 1.70 1.77
12
f /Thickness Class
26 26 27 27 28 28 29
use /Thickness
1.44
1.44
1.56
1.56
1.68
1.68
1.81
Calculated Thickness
1.53
1.58
1.63
1.68
1.75
1.81
1.89
16
i /Thickness Class
27 27 28 28 29 29 30
Lse /Thickness
1.56
1.56
1.68
1.68
1.81
1.81
1.95
Calculated Thickness
0.92* 0.97* 1.02* 1.08* 1.16* 1.26
1.40
21 r /Thickness Class 20 21 22 22 23 24 26
L'se /Thickness
0.91
0.98
1.06
1.06
1.14
1.23
1.44
Calculated Thickness
0.93* 0.97* 1.03* 1.09* 1.17
1.29
1.42
31 Use (Thickness Class 20 21 22 22 23 25 26
/Thickness
0.91
0.98
1.06
1.06
1.14
1.33
1.44
Calculated Thickness
0.98* 1.02* 1.08* 1.14
1.23
1.34
1.46
5
r /Thickness Class
21 22 22 23 24 25 26
u,e /Thickness
0.96
1.06
1.06
1.14
1.23
1.33
1.44
Calculated Thickness
1.06
1.12
1.18
1.25
1.34
1.43
t .53
8
- /Thickness Class
22 23 23 24 25 26 27
Lse /Thickness
1.06
1.14
1.14
1.23
1.33
1.44
1.56
Calculated Thickness
1.20
1.25
1.31
1.37
1.45
1.53
1.62
12
rr~ /Thickness Class
24 24 25 25 26 27 28
L,se (Thickness
1.23
1.23
1.33
1.33
1.44
1.56
1.68
Calculated Thickness
1.30 1.35 1.41 1.47 1.54 1.61 1.70
16
r/Thickness Class
25 25 26 26 27 27 28
L3e /T. 'ckness
1.33
1.33
1.44
1.44
1.56
1.56
1.68
Calculated Thickness
0.83* 0.88* 0.94* 1.01* 1.12
1.25
1.39
21 ir. /Thickness Class 20 20 20 21 23 24 26
8 (Thickness
0.91
0.91
0.91
0.98
1.14
1.23
1.44
Calculated Thickness
0.84* 0.89* 0.94* 1.02
1.14
1.27
1.40
31 Tt_,, /Thickness Class 20 20 20 22 23 24 26
(Thickness
0.91
0.91
0.91
1.06
1.14
1.23
1.44
Calculated Thickness
0.88* 0.93* 0.99
1.08
1.19
1.30
1.43
5
/Thickness Class
20 20 21 22 24 25 26
use (Thickness
0.91
0.91
0.98
1.06
1.23
1.33
1.44
Calculated Thickness
0.97 1.03 1.09 1.17 1.27 1.37 1.48
8
?_. / l hickness Class
21 22 22 23 24 25 26
Lse (Thickness
0.98
1.06
1.06
l.U
1.23
1.33
1.44
Calculated Thickness
1.09
l.U
1.20
1.27
1.35
1.45
1.55
12
/Thickness Class
22 23 24 24 25 26 27
(Thickness
\ .06 l.U 1.23 1.23 1.33 1.44 1.56
Calculated Thickness
1.17 1.23 1.28 1.35 1.43 1.51 1.60
16
r- /Thickness Class
23 24 25 25 26 27 27
(Thickness
l.U 1.23 1.33 1.33 1.44 1.56 1.56
* Asterisk following total calculated thickness indicates that truck aupertoad (Case 2) is the controlling factor. When total calculated thickness is not followed hv asterisk, surge pressure (Case 1) is the controlling factor. See Sec 1-2.1.
32
CTD000274
TABLE 1-3 Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Condi tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure;--psi
.0
50
100 j 150
200
Barrel Thicknesses--n.
Four-Inch Gas Pipe
21
31
5
4 8
12
16
Calculated Thickness Ir,, /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
Use \ Thickness
Calculated Thickness i Tc. 1 Thickness Class Use 1 Thickness
Calculated Thickness /Thickness Class
* (Thickness
Calculated Thickness /Thickness Class
Use 1Thickness
Calculated Thickness Use /Thickness Class
(Thickness
.23 .23 .23 .24 .24 22 22 22 22 22
.35 .35 .35 .35 .55
.22 .33 .23 .33 .33 22 22 22 22 22 .35 .35 .35 .35 .55
.23 .23 .24 .34 .24 22 22 22 22 22
.35 .35 .35 .55 .35
.25 .35 .35 .36 .36
22 22 22 22 22 .35 .35 .35 .35 .55
.27 .28 .38
1 .29
22 22 22 22 22
.35 .35 .35 .35 .55
.30 .30 .30 .31 .31 22 22 22 22 22 .35 .35 .35 .55 .35
250
.24 22 35
.23
22
.55
.25 22 .55
.37 22 .35
.29 22 .55
.32 22 .35
21
31
5
B
8
12
16
Calculated Thickness
{?SSclas3
Calculated Thickness 17 /Thickness Class Ux (Thickness
Calculated Thickness (Thickness C^as3
Calculated Thickness T jo* /Thickness Class Use (Thickness
Calculated Thickness itTM /Thickness Class Use \ Thickness
Calculated Thickness tTo* /Thickness Class
(Thickness
.23 .33 .23 .33 .33 .24 22 22 22 22 22 22 .35 .35 .35 .35 .35 .55
.22 .23 .23 .23 .24 .24 22 22 22 22 22 22 .35 .35 .35 .55 .55 .35
.23 .23 .23 .23 .24 .24 22 22 22 22 22 22 .35 .35 .35 .35 .55 .35
.24 .24 .24 .35 .25 .26 22 22 22 22 22 22 .35 .35 .35 .35 .35 .55
.21 .29 .29 .29 .30 .30 22 22 22 22 22 22 .35 .35 .35 .55 .55 .35
.29 .29 .29 .30 .30 .31 22 22 22 22 22 22 .35 .35 .35 .35 .35 .35
Calculated Thickness
.22 .22 .22 .22 .23 .23
21
/Thickness Class
22 22 22 22 22 22
(Thickness
.35 .35 .35 .35 .55 .35
Calculated Thickness
.22 .22 .22 .22 .23 .23
31 iTc- /Thickness Class
22 22 22 22 22 22
usc (Thickness
.35 .35 .35 .35 .35 .35
Calculated Thickness
.22 .22 .22 .22 .23 .23
5
/Thickness Class
22 22 22 22 22 22
Use (Thickness
.35 .35 .35 .35 .35 .3.5
Calculated Thickness
23 23 .23 .24 .24 .24
8
/Thickness Class
22 22 22 22 22 22
ose (Thickness
.35 .35 .35 .35 .35 .35
Calculated Thickness
.24 .24 .25 .25 .26 .27
12 Use (Thickness Class 22 22 22 22 22 22
* (Thickness
.35 .35 .35
.35 .35
35
Calculated Thickness
.26 26 27 .28 .28 29
16
. /Thickness Class
22 22 22 22 22 22
(Thickness
.35 .35 .35 .35 .35 .35
33
CTD000275
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover ft
Thickness Specifications
Internal Pressure--psi
`0
50
100
ISO
200
Barrel Thicknesses--in.
Six-Inch Gas Pipe
21
21
S A
8
12
16
Calculated Thickness Mo_ /Thickness Class
x \Thickness
Calculated Thickness tt,, /Thickness Class use \Tliickness
Calculated Thickness n,, /Thickness Class U3e /Thickness
Calculated Thickness tr,, /Thickness Class use /Thickness
Calculated Thickness it.. /Thickness Class Use /Thickness
Calculated Thickness t r_- /Thickness Class use \Thickness
.28 .29 .29 .30 .30 22 22 22 22 22 .38 .38 .38 .38 .38
.27 .28 .28 .29 .30 22 22 22 22 22 .38 .38 .38 .38 .38
.28 .29 .29 .30 .31 22 22 22 22 22 .38 .38 .38 .38 .38
.31 .31 .32 J3 .JJ 22 22 22 22 22 .38 .38 .38 .38 .38
.34 .35 .35 .36 ,J7 22 22 22 22 22 .38 .38 .38 .38 .38
.38 .38 .39 .39 .40 22 22 22 22 23 .38 .38 .38 .38 .41
21
31 5 B 8
12
16
Calculated Thickness /Thickness Class
use /Thickness
Calculated Thickness 1T /Thickness Class
\Thickness
Calculated Thickness ir__ /Thickness Class
\Thickness
Calculated Thickness f /Thickness Class use /Thickness
Calculated Thickness u,, /Thickness Class use /Thickness
Calculated Thickness Tr_- /Thickness Class use iThickness
.27 .28 .28 .29 .30 22 22 22 22 22 .38 .38 .38 .38 .38
.27 .27 .28 .28 .JP 22 22 22 22 22 .38 .38 .38 .38 .38
.28 .28 .28 .29 .30 22 22 22 22 22 .38 .38 .38 .38 .38
.29 30 .31 .31 .32 22 22 22 22 22 .38 .38 .38 .38 .38
.33 .34 .34 .35 .35 22 22 22 22 22 .38 .38 .38 .38 .38
.36 .36 .37 .38 .38 22 22 22 22 22 .38 .38 .38 .38 .38
21
31
5 F
8
12 1
16
Calculated Thickness ii,, /Thickness Class use /Thickness
Calculated Thickness ric- /Thickness Class use /Thickness
Calculated Thickness TTco /Thickness Class use /Thickness
Calculated Thickness p-A /Thickness Class
s /Thickness
Calculated Thickness rr-A /Thickness Class
3 /Thickness
Calculated Thickness m /Thickness Class
i Thickness
.26 .26 .27 .27 .28 22 22 22 22 22 .38 .38 .38 .38 .38
.26 .26 .26 .27 .28 22 22 22 22 22 .38 .38 .38 .38 .38
.26 .27 .27 .28 .28 22 22 22 22 22 .38 .38 .38 .38 .38
.28 28 .29 .29 JO 22 22 22 22 22 .38 .38 .38 .38 .38
.30 .31 .31 .32 .33 22 22 22 22 22 .38 .38 .38 .38 .38
.33 .33 .34 .35 .J5 22 22 22 22 22 .38 .38 .38 .38 .38
34
250
J
22
.38
.31 22 J8
.32 22 .38
.34 22 .38
J*
22
.38
.41 23 .41
.3/ 22 .J8
JO 22 .38
.31 22 .38
JJ 22 .38
.36 22 .38
JP 22 .38
.29 22 .38
.29 22 .38
JP 22 .38
.31 22 .38
J-J 22 .38
.36 22 .38
CTD000276
TABLE 1-3 {Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Condi* tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 10 50 too 150 200
Barrel Thicknesses--in.
Eight-Inch Gas Pipe
2*
H 5 A
8
12
16
Calculated Thickness /Thickness Class
Use \Thickness
Calculated Thickness .. /Thickness Class Use (Thickness
Calculated Thickness >T_ /Thickness Class U8e (Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness it*. /Thickness Class use (Thickness
Calculated Thickness lie /Thickness Class Use (Thickness
.33 .34 .35 .36 .37 22 22 22 22 22 .41 .41 .41 .41 .41
.32 .33 .34 .34 .35 22 22 22 22 22 .41 .41 .41 .41 .41
.JJ .34 .J5 .34 .37 22 22 22 22 22 .41 .41 .41 .41 .41
J6 .37 J7 .38 J9
22 22 22 22 22 .41 .41 .41 .41 .41
.41 .42 .42 .43 .44 22 22 22 23 23 .41 .41 .41 .44 .44
.44 .45 .45 .46 .47 23 23 23 24 24 .44 .44 .44 .48 .48
2
31
5
B
8
12
16
Calculated Thickness
lie /Thickness Class
u" (Thickness
Calculated Thickness
tie /Thickness Class
Use (Thickness
Calculated Thickness
He /Thickness Class
Use (Thickness
Calculated Thickness
He /Thickness Class
Use (Thickness
Calculated Thickness
He /Thickness Class
use (Thickness
Calculated Thickness
He /Thickness Class
Use (Thickness
.32 .32 .33 .34 .35 22 22 22 22 22 .41 .41 .41 .41 .41
.31 .32 .33 .33 .34 22 22 22 22 22 .41 .41 .41 .41 .41
.32 .33 .34 .34 .35 22 22 22 22 22 .41 .41 .41 .41 .41
.35 .35 .36 .37 .38
22 22 22 22 22
.41 .41 .41 .41 .41
.39 .39 .40 AS A2 22 22 22 22 22 .41 .41 .41 .41 .41
.42 .42 .43 .44 .45 22 22 23 23 23 .41 .41 .44 .44 .44
21
31
5
F
8
12
16
Calculated Thickness
He /Thickness Class
use (Thickness
Calculated Thickness nea /Thickness Class use (Thickness
Calculated Thickness t/Thickness Class b5e (Thickness
Calculated Thickness rrcss /Thickness Class use (Thickness
Calculated Thickness tt__ /Thickness Class Use (Thickness
Calculated Thickness i/Thickness Class use (Thickness
.29 .30 .31 .32 .33 22 22 22 22 22
.41 .41 .41 .41 A1
.29 .29 .30 .30 .3t 22 22 22 22 22
.41 .41 .41 .41 .41
.29 .30 .31 .32 .33 22 22 22 22 22
.41 .41 .41 .41 .41
.32 .33 .33 .34 .35 22 22 22 22 22 .41 .41 .41 .41 .41
.35 .36 .37 .37 .38
22 22 22 22 22
.41 .41 .41 .41
41
.38 .38 .39 .40 .41
22 22 22 22 22 .41 .41 .41 .41 .41
250
.38 22 .41
.36
22
.41
.J*
22
.41
.40
22
.41
.45 23 .44
.48 24 .48
.36 22 .41
.36
22
.41
.37
22
.41
.39 22 .41
A3 23 .44
.46 24 .48
.34 22 .41
.33
22
.41
.34 22 .41
.36 22 .41
.39 22 .41
.42 22 .41
35
CTD000277
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi
10
50
100
150
200
Barrel Thicknesses--in.
Ten-Inch Gas Pipe
Calculated Thickness n TI,, /Thickness Class
U3e (Thickness
Calculated Thickness 3J M,, /Thickness Class
ux (Thickness
Calculated Thickness 5 /Thickness Class
Us* (Thickness
Calculated Thickness 8 /Thickness Class
Use (Thickness
Calculated Thickness 12 .. /Thickness Class
Use (Thickness
Calculated Thickness 16 /Thickness Class
use (Thickness
.39 .40 .41 .42 .43 22 22 22 22 22 .44 .44 .44 .44 .44
.38 .39 .40 At .42 22 22 22 22 22 .44 .44 .44 .44 .44
.39 .40 .41 .42 .43 22 22 22 22 22 .44 .44 .44 .44 .44
.43 .43 .44 .46 .47 22 22 22 23 23 .44 .44 .44 .48 .48
.48 .49 .49 .50 .51 23 23 23 24 24 .48 AS .48 .52 .52
.50 .51 .52 .53 .54 24 24 24 24 25 .52 .52 .52 .52 .56
Calculated Thickness 21 f. /Thickness Class
U9C (Thickness
Calculated Thickness 31 /Thickness Class
use (Thickness
Calculated Thickness 5 /Thickness Class
U9C (Thickness
Calculated Thickness 8 TT,, /Thickness Class
Use (Thickness
Calculated Thickness 12 rr /Thickness Class
U9C (Thickness
Calculated Thickness 16 /Thickness Class
Use (Thickness
.37 .38 .39 .40 At 22 22 22 22 22 .44 .44 .44 .44 .44
.34 .37 .38 .39 .40 22 22 22 22 22 .44 .44 .44 .44 .44
.37 .J* .39 .40 .41 22 22 22 22 22 .44 .44 .44 .44 .44
.40 .41 .42 .43 .44 22 22 22 22 22 .44 .44 .44 .44 .44
.45 .46 .47 .48 .49 22 23 23 23 23 .44 .48 .48 .48 .48
.47 .48 .49 .50 .51 23 23 23 24 24 .48 .48 .48 .52 .52
Calculated Thickness 21 Te /Thickness Class
Use (xhickness
Calculated Thickness 3j r /Thickness Class
U9e (Thickness
Calculated Thickness 5 rt0-- /Thickness Class
e (Thickness
Calculated Thickness 8 Tr,, /Thickness Class
(Thickness
Calculated Thickness ! 2 . /Thickness Class
u c (Thickness
Calculated Thickness 16 r /Thickness Class
(Thickness
.34 .35 .36 .37 .38 22 22 22 22 22 .44 .44 .44 .44 .44
.33 .34 .35 .36 .37 22 22 22 22 22 .44 .44 .44 .44 .44
.34 .35 .36 .37 J8 22 22 22 22 22 .44 .44 .44 .44 .44
.Jtf .37 .38 .39 .41 22 22 22 22 22 .44 .44 .44 .44 .44
.41 .42 .43 .44 .45 22 22 22 22 22 .44 .44 .44 .44 .44
.43 .44 .45 .46 .47 22 22 22 23 23 .44 .44 .44 .48 .48
36
AS 22 .44
.44 22 .44
.44
22
.44
.48 23 .48
.52 24 .52
.56 25 .56
43 22 .44
.42 22 .44
.43 22 .44
.46 23 .48
.50 24 .52
.53 24 .52
.40 22 .44
.39 22 .44
.40 21 .44
.43 12 44
.46 23 .48
.V? 23 .48
CTD000278
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iren Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 10 50 too 150 200
Barrel Thicknesses--in.
Twelve-Inch Gas Pipe
Calculated Thickness
.44 .45 .46 .47 .49
21 it*- /Thickness Class
22 22 22 22 22
usc \ Thickness
.48 .48 .48 .48 .48
Calculated Thickness
.43 .43 .45 .46 .43
31
/Thickness Class
22 22 22 22 22
use (Thickness
.48 .48 .48 .48 .48
Calculated Thickness
.44 .45 .46 .47 .43
5 TTm /Thickness Class 22 22 22 22 22
use \ Thickness
.48 .48 .48 .48 .48
Calculated Thickness
.49 .49 .so .52 .53
8 r.,, /Thickness Class 22 22 23 23 23
use (Thickness
.48 .48 .52 .52 .52
Calculated Thickness
.53 .54 .55 .57 .53
12 ji,, /Thickness Class 23 24 24 24 25
use (Thickness
.52 .56 .56 .56 .60
Calculated Thickness
.56 .56 .58 .59 .60
16 it__ /Thickness Class 24 24 25 25 25
U9e [Thickness
.56 .56 .60 .60 .60
Calculated Thickness 21 tTe. /Thickness Class
use [Thickness
.41 .42 .44 .45 .46
22 22 22 22 22 .48 .48 .48 .48 .48
Calculated Thickness 31 /Thickness Class
u [Thickness
.40 .41 .42 .44 .45 22 22 22 22 22 .48 .48 .48 .48 .48
Calculated Thickness
.41 .42 .43 .45 .46
5 IIc,, /Thickness Class 22 22 22 22 22
use \ Thickness
.48 .48 .48 .48 .48
Calculated Thickness
.45 .46 .47 .49 .50
3
/Thickness Class
22 22 22 22 23
use (Thickness
.48 .48 .48 .48 .52
Calculated Thickness
.50 .51 .52 .53 .55
12 n_ /Thickness Class 23 23 23 23 24
use (Thickness
.52 .52 .52 .52 .56
Calculated Thickness
.52 .53 .54 .56 .57
16 rT,, /Thickness Class 23 23 24 24 24
use [Thickness
.52 .52 .56 .56 .56
Calculated Thickness 21 Tie- /Thickness Class
use [Thickness
.38 .39 .40 .41 .43 22 22 22 22 22 .48 AS AS .48 .48
Calculated Thickness 3} TT__ /Thickness Class
use [Thickness
.37 .38 .39 .40 .42 22 22 22 22 22
AS AS AS .48 AS
Calculated Thickness
.38 .39 .40 .41 .43
5 tt__ /Thickness Class 22 22 22 22 22
use [Thickness
.48 AS .48 .48 AS
Calculated Thickness
.4! .42 .43 .45 .46
8 i'co /Thickness Class 22 22 22 22 22
use [Thickness
.48 AS .48 AS AS
Calculated Thickness
.45 .46 .47 .48 .50
12
r-e_ /Thickness Class
22 22 22 22 23
[Thickness
AS .48 AS AS .52
Calculated Thickness
.47 .48 .49 .50 .52
16 r* /Thickness Class 22 22 22 23 23
\ Thickness
AS ,s A8 .52 .52
37
.51 23 .52
.50 23 .52
.50 23 .52
.55 24 .56
.59 25 .60
.62 25 .60
.48
22
.48
.47
22
.48
.48 22 .48
.52 23 .52
.56 24 .56
.59 25 .60
.45 22 .48
.44 22 AS
.45 22 AS
.48 22 AS
.52 23 .52
.53 23 .52
CTD000279
TABLE 1-3 (Continued) Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth
of Cover
21
Ji 5 A
8
12
16
Thickness Specifications
Internal Pressure--pri
10
50
100
ISO
200
Barrel Thicknesses--t r.
Sixteen-Inch Gas Pipe
Calculated Thickness n_ /Thickness Class Use (Thickness
Calculated Thickness rr_ /Thickness Class
* (Thickness
Calculated Thickness rrH /Thickness Class
(Thickness
Calculated Thickness rt_ /Thickness Class
\ Thickness
Calculated Thickness Tiu /Thickness Class
* (Thickness
Calculated Thickness it-- /Thickness Class
(Thickness
.53 .54 .56 .53 .60 22 22 23 23 23 .54 .54 .58 .58 .58
.52 .54 .55 .57 .59 22 22 22 23 23 .54 .54 .54 .58 .58
.54 .55 .57 .59 .61 22 22 23 23 24 .54 .54 .58 .58 .63
.60 .61 .63 .65 .67 23 24 24 24 25 .58 .63 .63 .63 .68
.65 .66 .67 .69 .71 24 25 25 25 26 .63 .68 .68 .68 .73
.68 .69 Jt .73 .75 25 25 26 26 26 .68 .68 .73 .73 .73
21
5 B
S
12
16
Calculated Thickness it-- /Thickness Class U8e \Thickness
Calculated Thickness ti-- /Thickness Class
(Thickness
Calculated Thickness it-- /Thickness Class
** \Thickness
Calculated Thickness rrTM /Thickness Class use (Thickness
Calculated Thickness it-- /Thickness Class U5e (Thickness
Calculated Thickness ir,, /Thickness Class
\ Thickness
.49 .50 .52 .54
56
21 21 22 22 23
.50 .50 .54 .54 .58
.49 .50 .52 .53 .56 21 21 22 22 23 .50 .50 .54 .54 .58
.St .51 .53 .55 .57 21 21 22 22 23 .50 .50 .54 .54 .58
.55 .56 .58 .60 .62 22 23 23 23 24 .54 .58 .58 .58 .63
.60 .61 .62 .64 .66 23 24 24 24 25 .58 .63 .63 .63 .68
.63 .64 .66 .67 .69 24 24 25 25 25 .63 .63 .68 .68 .68
21
31
5 F
8
12
16
Calculated Thickness IT-- /Thickness Class
[ Thick ness
Calculated Thickness /Thickness Class
U!>e (Thickness
Calculated Thickness T!,, /Thickness Class bse (Thickness
Calculated Thickness tv- /Thickness Class ose (Thickness
Calculated Thickness Pc* /Thickness Class
\Thickness
Calculated Thickness tv- /Thickness Class
\Thickness
.46 .47 .48 .50 .52 21 21 21 21 22 .50 .50 .50 .50 .54
.45 .46 .47 .49
52
21 21 21 21 22 .50 .50 .50 .50 .54
.47 .48 .40 .51
53
21 21 21 21 22
.50 .50 .50 .50 .54
.51 .52 .53 .55 .57
21 22 22 22 23
.50 .54
54 .54 .58
.54 .55 .57 .59 .61 22 22 23 23 24 .54 .54 .58 .58 .63
.57 .58 .59 .61 .63 23 23 23 24 24 .58 .58 .58 .63 .63
250
38
CTD000280
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 10 SO 100 ISO | 200
Barrel Thicknesses--in.
Twenty-Inch Gas Pipe
2J
31 S A
8
12
16
Calculated Thickness /Thickness Class
Use /Thickness
Calculated Thickness . /Thickness Class Use \Thickness
Calculated Thickness T__ /Thickness Class use /Thickness
Calculated Thickness n_ /Thickness Class u* /Thickness
Calculated Thickness /Thickness Class
Use /Thickness
Calculated Thickness i to. /Thickness Class uae /Thickness
.61 .62 .65 .67 .70 22 22 23 23 24 .62 .62 .67 .67 .72
.61 .62 .54 .66 .69 22 22 22 23 23 .62 .62 .62 .67 .67
.63 .65 .67 .50 .72 22 23 23 23 24 .62 .67 .67 .67 .72
.69 .70 .72 .75 .77 23 24 24 25 25 .67 .72 .72 .78 .78
.74 .76 .78 .50 .53 24 25 25 25 26 .72 .78 .78 .78 .84
.79 .to .82 .t4 .87 25 25 26 26 26 .78 .78 .84 .84 .84
2}
31
S B
8
12
16
Calculated Thickness /Thickness Class
u" /Thickness
Calculated Thickness to. /Thickness Class Use /Thickness
Calculated Thickness /Thickness Class
Use \Thickness
Calculated Thickness i to. /Thickness Class Use /Thickness
Calculated Thickness iut".. //TThhiicckknneessas Class
Calculated Thickness rT,, /Thickness Class use \Thickness
.56 .57 .59 .62 .65 21 21 21 22 23 .57 .57 .57 .62 .67
.55 .57 .50 .62 .54 n 21 21 22 22 j7 .57 .57 .62 .62
.St .59 .61 .54 .67 21 21 22 22 23 .57 .57 .62 .62 .67
.63 .64 .55 .69 .71 22 22 23 23 24 .62 .62 .67 .67 .72
,6t .69 .71 .73 .75 23 23 24 24 25 .67 .67 .72 .72 .78
.71 .73 .75 .77 .50 24 24 25 25 25 .72 .72 .78 .78 .78
Calculated Thickness 2} tto. /Thickness Class
use /Thickness
.50 .51 .55 .57 .50
21 21 21 21 22
.57 .57 .57 .57 .62
Calculated Thicknesa 31 rToo, /Thickness Class
use /Thickness
.SO .51 .53 .57 .60 2t 21 21 21 22 .57 .57 .57 .57 .62
Calculated Thickness
.52 .54 .56 .St .62
5 Tr,, /Thickness Class 21 21 21 21 22
use \Thickness
.57 .57 .57 .57 .62
Calculated Thickness
.56 .58 .50 .rf .55
8
/Thickness Class
21 21 22 22 23
use /Thickness
.57 .57 .62 .62 .67
Calculated Thickness
.61 .62 .54 .67 .70
12 t /Thickness Class 22 22 22 23 24
use /Thickness
.62 .62 .62 .67 .72
Calculated Thickness
.64 .<5<5 .55 .70 .72
16 T. /Thickness Class 22 23 23 24 24
usc /Thickness
.62 .67 .67 .72 .72
2S0
39
CTD000281
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi
10
50
100
ISO
200
Barrel Thicknesses--in.
Twenty-four-inch Gas Pipe
Calculated Thickness
.67 .69 .72 .75 .78
2*
/Thickness Class
22 22 23 23 24
u* JThickness
.68 .68 .73 .73 .79
Calculated Thickness
.67 .69 .71 .74 .78
31
/Thickness Class
22 22 23 23 24
U3e (Thickness
.68 .68 .73 .73 .79
Calculated Thickness
.71 .72 .75 .78 .81
5 iT,, /Thickness Class 23 23 23 24 24
u* (Thickness
.73 .73 .73 .79 .79
Calculated Thickness
.77 .79 .81 .84 .87
8 ii-- /Thickness Class 24 24 24 25 25
uae (Thickness
.79 .79 .79 .85 .85
Calculated Thickness
.84 .86 .88 .91
.94
12 n-- /Thickness Class 2$ 25 25 26 26
uae (Thickness
.85 .85 .85 .92 .92
Calculated Thickness
.90 .91 .94 .97 1.00
16
iT__ /Thickness Class
26 26 26 27 27
use \Thickness
.92 .92 .92 .99 .99
Calculated Thickness 21 rr-- /Thickness Class
U9e (Thickness
.61 .63 .65 .68 .72
21 21 21 22 23 .63 .63 .63 .68 .73
Calculated Thickness 31 it-- /Thickness Class
use (Thickness
.59 .62 .65 .68 .71 21 21 21 22 23 .63 .63 .63 .68 .73
Calculated Thickness
.63 .65 .67 .71 .75
5 ir,, /Thickness Class 21 21 22 23 23
use \Thickness
.63 .63 .68 .73 .73
Calculated Thickness
.69 .71 .73 .76 .79
8 it-- /Thickness Class 22 23 23 24 24
use (Thickness
.68 .73 .73 .79 .79
Calculated Thickness
.75 .77 .79 .82 .85
12 it-- /Thickness Class 23 24 24 25 25
u" (Thickness
.73 .79 .79 .85 .85
Calculated Thickness
.80 .81 .84 .87 .00
16 ns /Thickness Class 24 24 25 25 26
** \Thickness
.79 .79 .85 .85 .92
Calculated Thickness 2} it** /Tliickness Class
use \Thickness
.55 .56 .58 .tfj .67 21 21 21 21 22
.63 .63 .63 .63 .68
Calculated Thickness
31 it /Thickness Class u \Thickness
.54 .56 .58 .62 .66 21 21 21 21 22 .63 63 .63 .63 .68
Calculated Thickness
.57 .58 .62 .65 .68
5 ir /Thickness Class 21 21 21 21 22
use \Thickness
.63 .63 .63 .63 .68
Calculated Thickness
.62 .64 .67 .70 .73
8 tt /Thickness Class ?l 21 22 22 23
\Thickness
.63 .63 .68 .68 .73
Calculated Thickness
.67 .69 .72 75 .78
12 rt /Thickness Class 22 22 23 23 24
\Thiekness
.68 .68 .73 .73 .79
Calculated Thickness
.71 .73 .76 .79 .<53
16 /Thickness Class 23 23 24 24 25
\Thickness
.73 .73 .79 .79 .85
40
CTD000282
)
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth
of Cover
ft
Thickness Specifications
Internal Pressure--psi 10 50 100 150 200
Barrel Thicknesses--in.
Thirty-Inch Gas Pipe
Calculated Thickness
.80 .83 .86 .00
21 r i_ /Thickness Class
22 23 23 24
Use (Thickness
.79 .85 .85 .92
Calculated Thickness
.70 .82 .85 .*0
31 n.. /Thickness Class
22 23 23 24
use (Thickness
.79 .85 .85 .92
Calculated Thickness
.84 .86 .90 m
5 it.. /Thickness Class 23 23 24 24
use (Thickness
.85 .85 .92 .92
Calculated Thickness
.92 .94 .97 7.0/
8 it-. /Thickness Class 24 24 25 25
u" (Thickness
.92 .92 .99 .99
Calculated Thickness
1.01
1.03
1.06
1.09
12 it.. /Thickness Class 25 26 26 26
use (Thickness
.99 1.07 1.07 1.07
Calculated Thickness
1.07
1.09
1.12
1.15
16 i j /Thickness Class 26 26 27 27
use (Thickness
1.07
1.07
1.16
1.16
21
31
5 B
8
12
16
Calculated Thickness n /Thickness Class U3e (Thickness
Calculated Thickness yi /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
us* (Tliickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness /Thickness Class
u" (Thickness
Calculated Thickness ii /Thickness Class use (Thickness
.69 .74 .77 .81 21 21 22 22 .73 .73 .79 .79
.69 .73 .76 .0
21 21 22 22
.73 .73 .79 .79
.75 .77 .80 .85
21 22 22 23 .73 .79 .79 .85
Jt .83
.00
22 23 23 24
.79 8S .85 .92
.88 .90 .93 .97
23 24 24 25 .85 .92 .92 .99
.94 .96 .00 1.03
24 25 25 26 .92 .99 .99 1.07
21
31 5 F
8
12
16
Calculated Thickness n,, /Thickness Class Use (Thickness
Calculated Thickness it-- /Thickness Class Use \Thickness
Calculated Thickness tt-- /Thickness Class Use \Thickness
Calculated Thickness n_- /Thickness Class use (Thickness
Calculated Thickness n-- /Thickness Class usc (Thickness
Calculated Thickness ir /Thickness Class
x (Thickness
.63 .66 .70 .74
21 21 21 21
.73 .73 .73 .73
.63 .66 .70 .74
21 21 21 21
.73 .73 .73 .73
.68 .70 .73 .77 21 21 21 22 .73 .73 .73 .79
.73 .75 .7 9 .3 21 21 22 23 .73 .73 .79 .85
.79 .81 .5 .88 22 22 23 23 .79 .79 .85 .85
.84 .86 J>0 .03 23 23 24 24 .35 .85 .92 .92
250
41
CTD000283
TABLE 1-3 (Continued) Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Condi tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi
10
50
100
150
200
Barrel Thicknesses--*.
Thirty-six-inch Gas Pipe
2* 3J 5
4 8
12
16
Calculated Thickness /Thickness Class
U9e \Thickness
Calculated Thickness r,,, /Thickness Class Use 1 Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness /Thickness Class
Use (Thickness
Calculated Thickness /Thickness Class
U8e 1Thickness
Calculated Thickness r_- /Thickness Class uae \Thickness
.91 23 .94
.90 22 .87
.95 23 .94
1.04 24
1.02
US 26
1.19
1.23 26
1.19
.94 23 .94
.93 23 .94
.98 24
1.02
1.07 25
1.10
1.17 26
1.19
1.26 27
1.29
.98 24
1.02
.97 23 .94
1.02 24
1.02
1.11 25
1.10
1.21 26
1.19
1.29 27
1.29
1.02 24
1.02
1.02 24
1.02
1.07 25
1.10
1.15 26
1.19
1.25 27
1.29
1.33 27
1.29
21
31 5 B
8
12
16
Calculated Thickness tT,, /Thickness Class use 1 Thickness
Calculated Thickness Tr,, /Thickness Class use (Thickness
Calculated Thickness t | (Thickness Class use \Thickness
Calculated Thickness y. /Thickness Class use (Thickness
Calculated Thickness jt__ /Thickness Class Use (Thickness
Calculated Thickness rTM /Thickness Class U3e \Thickness
.79
21
.81
1 .79
21
.81
.83
21
.81
.90
22
.87
.99 24
1.02
1.06 IS
1.10
.82 2! .81
.81
21
.81
.86 22 .87
.93 23 .94
1.01 24
1.02
1.08 25
1.10
.86 22 .87
.85 22 .87
.90 22 .87
.96 23 .94
1.05 24
1.02
1.13 25
1.10
.91 23 .94
.90 22 .87
.94 23 .94
l.Ot 24
1.02
1.10 25
1.10
1.17 26
1.19
Calculated Thickness
2} t/Thickness Class * \Thickness
.71 .73 .79 .84
21 21 21 22
.81 .81 .81 .87
Calculated Thickness
.7/ .73 .78 .83
31 Tie. /Thickness Class
21 2t 21 21
Use lThickness
.81 .81 .81 .81
Calculated Thickness
.75 .78 .82 .87
5 r__ /Thickness Class 21 21 21 22
use \Thickness
.81 .81 .81 .87
Calculated Thickness
.81 .84 .88 .93
8 tj /Thickness Class 21 22 22 23
\Thickness
.81 .87 .87 .94
Calculated Thickness
.89 .91 .95 1.00
12 ? j /Thickness Cass 22 23 23 24
use \Thickness
.87 .94 94 1.02
Calculated Thickness
.05 .97 1.01 1.06
16
/Thickness Class
23 23 24 25
use iThickness
.94 .94 ! 02 1.10
42
250
CTD000284
TABLE 1-3 (Continued)
Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Laying Condi
tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi
10
50
100
150
200
Barrel Thicknesses--in.
Forty-two-inch Gas Pipe
Calculated Thickness
1.01
1.04
1.08
1.14
21 rt__ (Thickness Class
23 23 23 24
use (Thickness
1.05
1.05
1.05
1.13
Calculated Thickness
1.01
1.04
1.08
1.14
31
/Thickness Class
25 23 23 24
use (Thickness
1.05
1.05
1.05
1.13
Calculated Thickness
1.07
1.09
1.14
1.19
S it,, /Thickness Class 23 24 24 25
u" (Thickness
1.05
1.13
1.13
1.22
Calculated Thickness
1.16
1.19
1.24
1.29
8 ri,, /Thickness Class 24 25 25 26
Use (Thickness
1.13
1.22
1.22
1.32
Calculated Thickness
1.29
1.32
1.36
1.41
12
/Thickness Class
26 26 26 27
use (Thickness
1.32
1.32
1.32
1.43
Calculated Thickness
1.39
1.42
1.46
1.51
16 tic /Thickness Class 27 27 27 28
U9e (Thickness
1.43
1.43
1.43
1.54
2}
31
5 B
8
12
16
Calculated Thickness rr-- /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
U" (Thickness
Calculated Thickness /Thickness Class
use (Thickness
Calculated Thickness ti,, /Thickness Class use (Thickness
Calculated Thickness /Thickness Class (Thickness
Calculated Thickness u_ /Thickness Class use (Thickness
J6
21
.90
.86
21
.90
.91
21
.90
.99 22 .97
1.10 24
1.13
1.18 25
1.22
.89
21
.90
.89
21
.90
.94 22 .97
1.02 23
1.05
1.13 24
1.13
1.21 25
1.22
.94
22
.97
.94
22
.97
.98 22 .97
1.07 23
1.05
1.17 24
1.13
1.25 25
1.22
1.00
22
.97
1.00 22 .97
1.04 23
1 05
1.12 24
1.13
1.22 25
1.22
1.30 26
1.32
Calculated Thickness 21 it.. /Thickness Class
use (Thickness
.77 .80 .86 .92
21 21 21 21
.90 .90 .90 .90
Calculated Thickness
.77 80 .86 .92
31 ttc* /Thickness Class
2! 21 21 21
(Thickness
.90 .90 .90 .90
Calculated Thickness
.82 .85 .90 .96
5 Ha* /Thickness Class 21 21 21 22
(Thickness
.90 .90 .90 .97
Calculated Thickness
.89 .92 .97 1.03
8 n-. /Thickness Class 21 21 22 23
use (Thickness
.90 .90 .97 1.05
Calculated Thickness
.98 1.01 1.06 1.11
12 Use lTM^"'33 Class 22 23 23 24
(Thickness
.97 1.05 1.05 1.13
Calculated Thickness
1.06
1.08
1.13
1.18
16 t? /Thickness Class 23 23 24 25
lse (Thickness
1.05
1.05
1.13
1.22
43
CTD000285
TABLE 1-3 (Continued) Schedule of Barrel Thickness for Gas Pipe of 18/40 Iron Strength
Condi tion
Depth of
Cover
ft
Thickness Specifications
Internal Pressure--psi 10 50 LOO 150 200
Barrel Thicknesses--in.
Forty-eight-inch Gas Pipe
2}
31
s
A
8
12
16
Calculated Thickness
GiKS0"
Calculated Thickness IIt.,, /Thickness Class Use {Thickness
Calculated Thickness n,, /Thickness Class U3e {Thickness
Calculated Thickness u,, /Thickness Class Use {Thickness
Calculated Thickness Mm /Thickness Class Use (Thickness
Calculated Thickness /Thickness Class
use {Thickness
1.10 23
1.14
t.tt 23
1.14
1.18 23
1.14
1.29 25
1.33
1.43 26
1.44
1.55 27
1.56
t.14 23
1.14
1.14 23
1.14
1.22 24
1.23
1.33 25
1.33
1.47 26
1.44
1.58 27
1.56
1.19 24
1 23
1.20 24
1.23
1.27 24
1.23
1.38 25
1-33
1.52 27
1.56
1.63 28
1.68
1.25 24
1.23
1.26 24
1.23
1.32 25
1.33
1.43 26
1.44
1.57 27
1.56
1.69 28
1.68
21
31 5 B
12
16
Calculated Thickness /Thickness Class
U9e (Thickness
Calculated Thickness TTe_ /Thickness Class
x (Thickness
Calculated Thickness iTc* /Thickness Class
(Thickness
Calculated Thickness t To- /Thickness Class use {Thickness
Calculated Thickness it.. /Thickness Class use {Thickness
Calculated Thickness T /Thickness Class U9C (Thickness
.93
21
.98
.94
21
.98
.99
21
.98
1.09
22
1.06
iat 24
1.23
1.30 25
1.33
.97
21
.98
.98
21
.98
1.03 22
1.06
1.12 23
1.14
1.25 24
1.23
1.34 25
1.33
1.03 22
1.06
1.03
22
1.06
1.09
22
1.06
1.17 23
1.14
1.30 25
1.33
1.38 25
1.33
1.09 22
t.06
1.10 23
1.14
1.15 23
1.14
1.24 24
1.23
1.35 25
1.33
1.44 26
1.44
Calculated Thickness 21 T. /Thickness Class
Use (Thickness
.84 .88 .93 1.00
21 21 21 21
.98 .98 .98 .98
Calculated Thickness 31 n,, /Thickness Class
usc (Thickness
.84 .88 .94 1.01 21 21 21 2!
.98 .98 .98 .98
Calculated Thickness
.90 .PJ .99 1.04
5 n,, /Thickness Class 21 21 21 22
use (Thickness
.98 .98 .98 1.06
Calculated Thickness
.97 1.01 1.07 1.13
8 r /Thickness Class 21 21 22 23
use (Thickness
.98 .98 1.06 1.14
Calculated Thickness
1.08
1.12
1.16
123
12 TT_ /Thickness Class 22 23 23 24
use (Thickness
1.06
1.14
1.14
1.23
Calculated Thickness
1.15
120
1.25
1.31
16 /Thickness Class 23 24 24 25
Lse (Thickness
1.14
1.23
1.23
1.33
-14
250
CTD000286
Sec. 1-2--General Procedure for Thickness Determination
Sec. 1-2.1--Scope
This section gives the general method for determining the thicknesses of castiron pressure pipe. Thickness nomo grams (Fig. 1-1 through 1-5) are in cluded for two commonly used iron strengths (18/40 and 21/45); thick nesses for other iron strengths may be computed by the method presented in Sec. 1-3.1.
The required thickness of cast-iron pipe is determined by considering trench load and internal pressure in combination, and calculations of net thickness are made for two cases, namely:
Case 1. Trench load (earth load but no truck superload) in combination with internal pressure (working pres sure plus surge pressure) and with a 2.5 factor of safety applied to both trench load and internal pressure
Case 2. Trench load (earth load plus truck superload) in combination with internal pressure (working pres sure but no surge pressure) and with a 2.5 factor of safety applied to both trench load and internal pressure.
The larger thickness thus deter mined is chosen as the net thickness (only Case 2 is used for gas pipe). To the net thickness is added a cor rosion allowance to obtain the minimum manufacturing thickness and a casting tolerance to obtain the total calculated thickness. Finally, the thickness for specifying and ordering is selected from a table of standard class thick nesses.
An example of this method is shown in Sec. 1--2.3.
Sec. 1-2.2--Procedure for Thickness Determination
This section gives the procedure for determining total calculated thick
nesses and standard class thicknesses for pipe. This procedure was used in calculating the values shown in Sec. 1-1, Tables 1-1, 1-2 and 1-3.
1-2.2.1--Determination of Net Thick ness
The net thickness for the more usual conditions may be readily determined using Tables 1-4 and 1-5 and the nomograms in Fig. 1-1 through 1-5. The bases for these tables and nomo grams are described in Sec. 1-3. The three most commonly used methods of laying pipe, called "laying conditions," are defined below:
Laying Condition
Description
A Pipe laid on flat-bottom trench,
backfill not tamped
B Pipe laid on flat-bottom trench, backfill tamped
F Pipe bedded in gravel or sand,
backfill tamped
After the pipe size, working pressure, iron strength, laying condition, and depth of cover have been established, the procedure for determining net thickness is as follows:
a. From Table 1-4, select for both Case 1 and Case 2 the value of w, which is the ring test load equivalent of trench load including a 2.5 safety factor (see Sec. 1-3.1 for definition of ring test load equivalent).
b. From Table 1-5, select for both Case 1 and Case 2 the value of p, which is the internal pressure including a 2.5 safety factor.
r. Thickness nomograms are pro vided in Fig. 1-1 through 1-5 for iron strengths of 18/40* and 21/45.* Se-
* The first figure designates the bursting tensile strength in 1,000 psi and the second figure designates the ring modulus of rupture in 1,000 psi.
+5
CTD000287
46 AMERICAN NATIONAL STANDARD
lect the nomogram for the desired iron strength and range of loads and pres sures. Locate the values of w and p for Case 1 on the vertical scales. Con nect these values with a straightedge and read the required thickness for Case 1.
d. Repeat this procedure using the above values of w and p for Case 2 and read the required thickness for Case 2.
e. The larger thickness, as deter mined for Cases 1 and 2, is the net thickness for water pipe. (For gas pipe, only Case 2 is applicable.)
1-2.2.2--Addition of Allowances to Net Thickness
a. A corrosion allowance of 0.08 in. is added to the net thickness. The re sulting thickness is the minimum manu facturing thickness. Where severe cor rosion is anticipated, an analysis of the condition should be made.
b. A casting tolerance from Table 1-6 is added to the minimum manufac turing thickness and the resulting thickness is the total calculated thick ness.
1-2.2.3--Selection of Standard Thick ness
Refer to Table 1-7 and select the standard class thickness nearest to the total calculated thickness. When the calculated thickness is halfway between two standard thicknesses, the larger of these is selected. When the calculated thickness is less than the smallest stand ard thickness, the smallest standard thickness is selected.
Sec. 1-2.3--Example for Determining Thickness of 18-in. Water Pipe
Determine the thickness for 18-in. cast-iron pipe laid on flat-bottom trench with tamped backfill (laying condi tion B), under 5 ft of cover for a working pressure of 200 psi. Iron strength is 18/40.
1-2.3.1--Step 1--Determination of Net Thickness
a. From Table 1-4, the ring test load equivalents of trench load, includ ing a safety factor of 2.5, are
For Case 1, w = 2,786 lb/lin ft For Case 2, tv = 3,876 lb/lin ft
b. From Table 1-5, the internal pres sures, including a safety factor of 2.5, are
For Case 1, p = 750 psi For Case 2, p = 500 psi
c. Using Fig. 1-1, locate w = 2,786 and p = 750 on the vertical scales. Connect these values with a straight edge and read the thickness for Case 1, which is 0.47 in.
d. Using Fig. 1-1, locate w = 3,876 and p = 500 and read the thickness for Case 2, which is 0.46 in.
e. The larger of these two thick nesses is the net thickness. The con trolling one in this example is 0.47 in. (Case 1).
1-2.3.2--Step 2--Addition of Allow ances to Net Thickness
The total calculated thickness, as shown in Table 1-1, is determined as follows:
Net thickness Corrosion allowance
Minimum manufacturing thickness Casting tolerance (Table 1-6)
Total calculated thickness
0.47 in. 0.08 in.
0.55 in. 0.08 in.
0.63 in.
1-2.3.3--Step 3--Selection of Stand ard Thickness
From Table 1-7, the total calculated thickness of 0.63 in. is exactly the same as Class 23. Therefore, Class 23 is the standard thickness class for the pipe in this example.
In ordering or specifying, the fore going pipe is identified as 18-in. size, thickness Class 23, conforming to A XS1 Standard A21.6 or A21.8 as applicable.
CTD000288
THICKNESS DESIGN OF CAST-IRON PIPE
47
TABLE 1-1 Ring Test Load Equivalents (w) of Trench Loads--Ib/lin ft*
Laying Pipe Condi Size
tion in.
Depth of Cover--fi
2i a
5
8
12 16 20
Case I--Ring Test Load Equivalent of Earth Load (Use With Surge Pressure)
24
3 396 4 49t 6 672 8 826 10 974
12 mu
14 1.235 16 1.341 18 1,446 A 20 1.552
24 1,770 30 2.093 36 2,437 42 2.761 48 3,102
54 3.437 60 3,778
3 3S5 4 438 6 585 8 709
10 824
12 926 14 1.007 16 1,079
IS 1,147 B 20 1,214
24 1.339
30 1.524 36 1,709 42 1,879 48 2.074
54 2.259 60 2,455
3 261 4 323 6 434 8 528
10 612
12
14 16 18 F 20
691 755 812 861
915
24 1,018 30 1,157 36 1.310 42 1,443 48 1,586
54 1,726 60 1,881
565 704 974
1.211
1,448
1,674 ltK87 2.085 2.265 2,433
2,730 3,167 3,626 4,083 4.S50
5,022 5,493
508 628 848 1.039 1,224
1.395 1,539 1,677 1,797 1,903
2,066 2,305 2,543 2,778 3,042
3,300 3,569
374 463 629 774 910
1,041 1,154 1,262 1,350 1,435
1,570 1,751 1,949 2,134 2,326
2,522 2,735
817 1.024 1.428 1,791 2,157
2,520 2,865 3,196 3,513 3,815
4.372 5,087 5,713 6,341 6,991
7,650 8,313
734 913 1,244 1,537 1,823
2,100
2.337 2.570 2,786 2,985
3.307 3,703 4,006 4,315 4,674
5,027 5,401
S40 673 923 1.144 1,355
1,566 1,753 1,934 2,093 2.250
2,514 2,812 3,070 3,315 3,573
3,842 4,139
1,324 1,663 2,337 2,948 3,576
4,239 4.822 5,176 5.506 5,839
6,509 7,520 8,537 9,556 10,580
11,609 12,643
1,189 1,483 2,036 2,530 3,024
3.S33 3.933 4,163 4,367 4,568
4,924 5.473 5,986 6,503 7,074
7,629 8,215
87S 1,093 1,510 1,883 2.247
2.635 2,949 3,133 3,281 3,444
3,742 4,157 4,588 4,996 5,408
5,830 6,295
2,000
2,515 3,548 4,491 5,376
5,839 6.304 6,776 7,250 7.728
8,693 10,161 11,643 13,078 14,646
16,161 17.815
1.797 2.242 3.091 3.855 4,546
4,866 5.142 5.449 5.750 6,046
6,577 7.396 8.165 8,899 9.792
10,620 11.575
1.322 1,653 2.292 2,869 3,378
3,630 3,856 4,101 4,320 4,558
4,999 5,618 6,257 6.837 7,485
8,116 8,869
2,674 3.367 4.756 5,635 6,198
6.774 7,356 7,954 8,548 9,150
10,378 12,256 14,167 16,104 18,061
20.039 22,028
2,402 3.002 4.144 4,836 5,241
5,645
6,000
6,397 6,779 7,158
7,852 8,921 9,935 10,959 12,076
13,169 14,312
1.767 2.213 3.073 3,600 3,895
4,211 4,500 4,315 5,093 5,396
5,968 6.776 7,613 8,418 9,231
10.063 10,967
3,343 4,222 5,487
6,120
6,770
7,433 8.115 8,804 9.509 10,224
11,678 13.915 16,220 18,554 20,928
23.346 25.776
3,004 3.764 4.780 5,252 5,724
6,194 6,618 7,080 7.541 7,998
8,836 10,128 11,373 12,626 13,993
15,342 16,747
2,210
2,774 3,545 3.910 4,254
4,620 4,964 5,329 5,666 6.029
6.715 7,693 8.716 9,699 10,697
11,724 12,832
4,026 5,074 5,754 6,446 7,163
7.902 8,659 9.433 10.224 11.033
12.680 15,237 17,882 20,560 23,354
26,161 28,998
3,617 4,523 5,014 5,531 6,057
6,586 7.062 7,586 8,109 8,631
9,593 11.090 12,540 14,015 15,615
17.191 18,841
2,661 3,334 3,718 4,118 4,502
4,912 5.297 5.709 6,092 6,506
7.291 8,424 9.610 10.766 11,937
13,138 14,436
* A safety factor of 2.5 is included. These ring test load equivalents are based on the earth loads in Table 1-8.
CTD000289
48 AMERICAN NATIONAL STANDARD
TABLE 1-4 (Continued) Ring Test Load Equivalents (w) of Trench Loads--lb/lin ft*
Laying Pipe
Depth of Cover--ft
Condi Size
tion in.
2 3
5
8
12 16 20 24
Case 2--Ring Test Load Equivalent of Earth Load Plus Truck Superload (Use Without Surge Pressure)!
J 748 4 1,137 6 1,904 8 2,528 10 3,087
741 1,057
1,678 2,267
2,798
12 3,635 14 3,880 16 4,183 18 4,489 A 20 4,865
3,317
3.641 3,996 4,361 4,772
24 5.383 30 6,278
36 7,180 42 7,878 48 8,596
5,250 6.115 7,054 7,887
8.728
54 9.165 60 9,789
9,483 10,237
3 672 4 1,014 6 1,659 6 2,170
10 2,610
666
942 1,462 1,946 2,366
12 3,029 14 3,165 16 3.364 B 18 3,560 20 3,806
2.765 2.970 3.213 3,459
3,733
24 4,072 30 4,570
36 5,035 42 5,361 48 5,747
3,972 4,451 4,947 5.367 5,836
54 6,023 60 6,360
6.232 6.651
3 494 4 747
6 1,230
8 1.615 10 1,940
490 694 1,084 1.449 1.758
12 2.260
14 2,374 16 2,532 F 18 2,675 20 2,869
2,062 2.227
2,418 2.598 2,814
24 3,095 30 3.471 36 3,859 42 4,118 48 4,393
3,019 3.381 3,791 4,123
4.461
54 4.603 60 4,874
4.762 5,097
935
1,200
1.839 2,437 2,978
3,517 4.039 4,478 4,887 5,400
6,043 7,083 8,083 9,035 10,035
10,967 11,904
840 1,070 1,602 2.091 2,518
2,931 3,294 3,601 3,876 4,225
4,572 5,155 5,668 6,148 6,709
7,207 7,734
618 789 1,188 1,557 1,872
2,187 2,471 2.711 2,912 3,185
3.475 3.916 4.343 4.723 5,129
5.508 5,927
1,411 1,780 2,541 3,270 3,987
4,767 5.409 5,880 6,298 6,730
7,513 8,746 9,911 11,115 12,350
13,563 14,783
1,268 1,587 2,214 2,806 3,371
3,973 4,411 4,729 4,995 5.265
5,684 6,366 6,950 7,564 8,257
8,913 9,604
932 1,170 1,642 2,089 2,505
2.964 3,309 3.559 3,752 3,969
4,320 4.835 5.326 5,810 6,312
6,811 7,360
2,059 2.602 3.696 4,696 5,611
6,104 6,598 7,128 7,661 8,198
9,250 10,865 12,465 14,076 15,761
17,452 19,193
1,850 2.320 3.220 4,030 4,744
5.087 5.381 5,733 6,076 6.413
6,998 7,908 8,741 9,578 10.538
11,469 12,470
1,361 1.710 2,388 3,000 3,526
3.795 4.036 4,315 4,565 4,835
5.319 6,007 6,698 7,358 8,055
S.764 9,556
2,704 3,426 4,843 5.752 6,346
6,950 7,561
8.220
8.841 9.S02
10,761 12.726 14,724 16,778 18,824
20,861 22,909
2,430 3,054 4,220 4,937 5,366
5,792 6,166 6.610 7.012 7,434
8.141 9,263 10,325 11,417 12,586
13,709 14,884
1,787 2,251 3,129 3,675 3.988
4.320 4.625 4,975 5,268 5,604
6,188 7,036 7.912 8.771 9.621
10.476 11.405
3,363 4,261 5.543 6,198 6.867
7,548 8,250 8,980 9.702 10,456
11,930 14,226 16,587 19,000 21,432
23.902 26.393
3,021 3.798 4.830 5.319 5,807
6,290 6,729 7,222 7,695 8,180
9.026 10.354 11.631 12.929 14,330
15,707 17,148
2,223 2.800 3,581 3,960 4,316
4.692 5,046 5.436 5.781 6.167
6,360 7.865 8.914 9.932 10,954
12.003 13,140
4,041
5,104 5,798 6,506 7,239
7,991
8,763 9,567 10,374
11.213
12,876 15.476 18,167 20.939
23.743
'
26.572 29,437
3,631 4.550 5.051 5.584
6,121
6.659 7.147 7.694 3,228 8,772
9.742 11,264 12.739
14,248 15,875
17.461 19,126
2.671 3,354 3.746 4,157 4,549
4,968 5,360 5.791 6.181
6,613
7,404 8,556 9.763 10,945
12,136
13,344 14,655
*A safety factor of 2.5 is included. These ring test load equivalents are based on the earth loads and truck supertoads in Table 1-8.
t Truck superload is based on two passing trucks with adjacent wheels 3 ft apart, having a 9,000-lb wheel load on unpaved road or flexible pavement and an impact factor of 1.50 (see Sec. 1-3.3).
CTD000290
THICKNESS DESIGN OF CAST-IRON PIPE
TABLE 1-5 Internal Pressures (p)*
Pipe in.
10
Rated Working Pressure--psi SO 100 150 200 250 300
Case 1--Internal Pressure With Surge Pressure Allowancesf
_3 425 550 675 800 925 1,050
4 -- 425 550 675 800 925 1,050 6 -- 425 550 675 800 925 1,050 8 -- 425 550 675 800 925 1,050 10 -- 425 550 675 800 925 1,050
12 ____ 400 525 650 775 900 1,025 14 -- 400 525 650 775 900 1,025 16 -- 375 500 625 750 875 1,000 18 -- 375 500 625 750 875 1,000 20 -- 350 475 600 725 850 975
24 ____ 338 463 588 713 838 963 30 -- 325 450 575 700 825 950 36 -- 313 438 563 688 813 938 42 -- 300 425 550 675 800 925 48 -- 300 425 550 675 800 925
54 ____ 300 425 550 675 800 925 60 -- 300 425 550 675 800 925
Case 2--Internal Pressure Without Surge Pressure Allowances
3-60 alt
25
125 250 375 500 625
750
* Safety factor of 2.5 included, t For surge pressure allowances, see Table l--10.
350
1,175 1,175 1,175 1,175 1,175
1,150 1,150 1,125 1,125 1,100
1,088 1,075 1,063 1,050 1,050
1,050 1,050
875
Pipe Size in.
3-8 10-12
TABLE 1-6 Allowances For Casting Tolerance
Casting Tolerance in.
0.05 0.06
{( ;
|J
|
Pipe Size -
14-24 30-48
Casting Tolerance
0.08 0.10
CTD000291
50 AMERICAN NATIONAL STANDARD
TABLE 1-7--Standard. Thickness Classes of Cast-Iron Pipe (See note on facing page)
Pipe Size in.
20
21
Thickness for Standard Thickness Class Number--in.
22 23 24 25 26 27 28
3 4
6
8 0.35* 10 0.38* 12 0.41* 14 0.43 16 0.46 18 0.50 20 0.53 24 0.58 30 0.68* 36 0.75* 42. 0.83* 48 0.91*
0.35* 0.38 0.41 0.44 0.48* 0.50* 0.54* 0.57* 0.63* 0.73 0.81 0.90 0.98
0.32* 0.35* 0.38 0.41 0.44 0.48 0.51 0.54 0.58 0.62
0.68
0.79 0.87 0.97 1.06
0.35 0.38 0.41 0.44 0.48 0.52 0.55 0.58 0.63 0.67 0.73 0.85 0.94 1.05 1.14
0.38 0.41 0.44 0.48 0.52 0.56 0.59 0.63
0.68
0.72 0.79 0.92
1.02
1.13 1.23
0.41 0.44 0.48 0.52 0.56 0.60 0.64
0.68
0.73 0.78 0.85 0.99
1.10
1.22
1.33
0.44 0.48 0.52 0.56 0.60 0.65 0.69 0.73 0.79 0.84 0.92 1.07 1.19 1.32 1.44
0.48 0.52 0.56 0.60 0.65 0.70 0.75 0.79 0.85 0.91 0.99 1.16 1.29 1.43 1.56
0.52 0.56 0.60 0.65 0.70 0.76 0.81 0.85 0.92 0.98 1.07 1.25 1.39 1.54
1.68
29
0.56 0.60 0.65 0.70 0.76 0.82 0.87 0.92 0.99 1.06 1.16 1.35 1.50
1.66
1.81
30
0.60 0.65 0.70 0.76 0.82 0.89 0.94 0.99 1.07 1.14 1.25 1.46 1.62 1.79 1.95
100 psi
16 15 14 13 12 n 10 9 8 7 o. 6 5 4 3 2
1
0
Fig. 1-1. Thickness Nomogram for Pipe of 18/40 Iron Strength, Low-Range Load Thicknesses are net, and computations are made using nominal pipe diameter for in side diameter. S equals 18,000, R equals 40,000. The encircled values at the end of
each curve are for pipe size, in inches.
CTD000292
THICKNESS DESIGN OF CAST-IRON PIPE
51
Fig. 1-2. Thickness Nomogram for Pipe of 18/40 Iron Strength, High-Bange Load Thicknesses are net, and computations are made using nominal pipe diameter for in side diameter. S equals 18,000, R equals 40fl00. The encircled values at the end of
each curve are for pipe size, in inches.
Explanatory Note to Table 1-7
Irrespective of calculated thickness, standard thicknesses are not made less than certain minimums, which are the smallest thickness classes shown in the table. They have been chosen by judgment based on experience with the shocks received by pipe in handling and transporting. ANSI Standards A21.6, A21.7, A21.8, and A21.9 are based on iron strength of 18/40. The recommended minimum nominal thicknesses for such pipe are shown in boldface type. Pipe of 21/45 iron strength for water service may have thicknesses less than those pipe of 18/40 iron strength. Pipe of such reduced thickness should be used only after consideration of possible adverse conditions of installation and environment. The recommended minimum nominal thicknesses for such pipe are shown with an asterisk. Pipe with 21/45 iron strength in Thickness Class 20 are sometimes used in sizes 14-24 in., when the cal culated thicknesses permit and where provisions are made for special handling.
CTD000293
-1,000 Ib /lm ft
100 psi-
52 AMERICAN NATIONAL STANDARD
Tig. 1-3. Thickness Nomogram for Pipe of 21/45 Iron Strength, Low-Range Load Thicknesses are net, and computations arc made using nominal pipe diameter {or in side diameter. S equals 21,000. R equals 45,000. The encircled values at the end of
each curve are {or pipe sice, in inches. CTD000294
-1,000 Ib /lin It
THICKNESS DESIGN OF CAST-IRON PIPE
53
15
14
13 12
11 10 9
8
7 a. 3
6
5 4
3
2
1
0
Pig. 1-4. Thickness Nomogram for Pipe of 21/45 Iron Strength, Medlnm-Bange Load Thicknesses are net, and computations are made using nominal pipe diameter for in side diameter. S equals 21,000, R equals 45,000. The encircled values at the end oj
each curve are for pipe size, in inches.
isd o o i-
CTD000295
54 AMERICAN' NATIONAL STANDARD
~r
*
0
Fig. 1-5. Thickness Nomogram for Pipe of 21/45 Iron Strength, High-Range Load Thicknesses are net, and computations are made using nominal pipe diameter for in side diameter. S equals 21,000, R equals 45,000. The encircled values at the end of
each curve are for pipe size, in inches.
CTD000296
#
Sec. 1-3--Design Theory--Determination of Net Thickness. Earth Load, and Truck Superload
Sec. 1-3.1--Determination oi Net Thickness
Tests made for ANSI Committee A21* showed that, when a pipe has both an external load applied in threeedge bearing (such as the laboratory ring test) and an internal pressure, the relation between external load and internal pressure at the point of breaking can be represented, with sufficient accuracy, by a parabola drawn as in Fig. 1-6.
The mathematical relationships expressed by the formula for the loadpressure curve are the basis for the whole system of pipe thickness calcu lations used in this standard.
The equation of the load-pressure parabola is
(1)
in which:
R -- ring modulus of rupture (psi)
5 = bursting tensile strength (psi)
t = net thickness (in.) d = nominal pipe size (in.).
The symbols 5 and R denote the strength of the iron in the pipe and are based on periodic full-length bursting tests and ring tests as specified in ANSI Standards A21.6 (AWWA C106), A21.7, A21.8 (AWWA C108), and A21.9.
The design values of w to be used in solving Eq 1, either by nomogram or by trial calculation, are determined as follows:
For Case 1,
in which:
W = ring test crushing load with no internal pressure (lb/ lin ft)
P -- bursting pressure with no external load (psi)
p and w are any combination of internal pressure and ex ternal load that will just cause fracture.
The values of IV and P are calcu lated as follows:
II
0.0795(a + 0
2 Si P = Y-
(2) (3)
* See Ref. 3, "Foreword," p. x.
For Case 2, w =2--.-5--(-W-- . + W,)
(5)
in which:
w = ring test load equivalent of trench load (lb/lin ft), in cluding a 2.5 safety factor
= earth load (ib/ft) (Table 1-8 and Sec. 1-3.2)
Wt -- truck superload (lb/ft) (Table 1-8 and Sec. 1--3.3)
Lt -- load factor dependent on laying condition (Table 1-9)
2.5 = safety factor.
The load factor Lf converts the trench load (earth load only or earth
03
CTD000297
56 AMERICAN' NATIONAL STANDARD
load plus truck superload) to an equivalent load in the laboratory ring test. Table 1-4 gives values of w computed from Eq 4 and 5 for stand ard depths of cover using the earth loads and truck superloads in Table 1-8 and the load factors in Table 1-9.
The design values of p to be used in solving Eq 1, either by nomogram or by trial calculation, are determined as follows:
For Case 1, P = 2.5 (/>,, -p p,)
(6)
For Case 2,
p = 2.5 />,, in which:
(V)
p = internal pressure (psi), in cluding a 2.5 safety factor
pw -- working pressure (psi) p, -- allowance for surge pres
sure (psi) (Table 1-10) 2.5 = safety factor.
Table 1-5 gives values of p com puted by Eq 6 and 7 for standard working pressures using the allow ances for surge pressure in Table 1-10.
As described in Sec. 1-2.2, calcula tions for net thickness for water pipe are made for two conditions of com bined loading: Case 1, which includes surge pressure but not truck super load; and Case 2, which includes truck superload but not surge pres sure. The larger of the two thick nesses is used for design. Truck supcrload and surge pressure are transient and occasional loads, and it is considered extremely unlikely that they will occur simultaneously.
\\ hen Eq 2 and 3 are substituted in Eq 1, the result is a high-order equa tion which cannot be solved directly for the net thickness l by conventional mathematical procedure. It is nec essary to resort to graphical solution
or to successive approximation. The more convenient method for routine work is to use a nomogram as shown in Fig. 1-1 through 1-5. Such nomo grams are prepared by the following steps:
a. Using the appropriate iron strength values of 5 and R, calculate W and P for a series of thicknesses for each pipe size by means of Eq 2 and 3.
b. For each thickness select two values of p and compute the corre sponding values of w using Eq 1.
c. Set up parallel scales for w and p, using linear increments for the p scale and increments proportional to the square of the load for the w scale.
d. Using a straightedge to connect the corresponding values of w and p, locate and mark the intersection of the two lines determined by the two sets of values for each thickness.
e. Repeat for the full series of thicknesses to lay out the curve for each pipe size.
If it is desired to determine net thickness for iron strengths or loads and pressures not covered in the nomograms in Fig. 1-1 through 1-5, a trial calculation method may be used to solve Eq 1, as follows:
a. Based on the values of w and p corresponding to the design condi tions, assume a trial value of t.
b. Using the known iron strength values 5 and R and the trial value of t, calculate W and P from Eq 2 and 3.
c. Using these values of W and P and the design value of p, solve Eq 1 for w.
d. Compare this calculated value of u1 to the design value of w and assume a smaller or larger value of t, as re quired, for the second trial calculation.
e. Continue until a change in as sumed thickness of less than 0.01 in. results in a calculated w equal to or greater than the design w.
CTD000298
THICKNESS DESIGN OF CAST-IRON PIPE
57
A graphical method may also be used for determining thicknesses for conditions not covered in the nomo grams in Fig. 1-1 through 1-5. The parabolic graphical method is de scribed in Sec. 1-12.3 of ANSI A21.11957 (AYVWA Hl-57).
Sec. 1-3.2--Earth Loads (We)
For computation of earth loads on cast-iron pipe the type of installation is identified as shown in Fig. 1-7. Ditch condition (Fig. l-7a, b, c) de notes pipe laid in a relatively narrow trench and backfilled to the original ground surface. The trench width at the top of the pipe determines the load and the ditch may be widened above the top of the pipe for installation convenience (Fig. 1-7 b, c) without increasing the load on the pipe. Em bankment condition includes two types of installation: positive projec tion condition (Fig. 1--7d) which de notes pipe laid on top of a subgrade and covered with fill, and negative projection condition (Fig. 1--7e) which denotes pipe laid in a trench in the subgrade and covered with fill, which extends substantially above the sub grade. Methods for calculating earth loads for these three installation con ditions are given below:
in which :
IV, = earth load, lb per linear ft
Cd = calculation
coefficient,
ditch condition
Cc = calculation
coefficient,
positive projection condi
tion
w = soil density (120 Ib/cu ft
assumed in standard cal
culations)
Bd = width of trench at top of
pipe (ft) (for standard cal
culations use nominal pipe
diameter plus 2 ft)
Be = outside diameter of pipe,
ft.
This procedure was established by work done at Iowa State College,* which proved that for certain com binations of pipe size, trench width, and depth of cover, the load given by Eq 9 for positive projection condition should be used when it is the lesser of the two loads even though the pipe is laid in a trench.
The calculation coefficient Cd is obtained from Fig. 1-8 or from the following equation:
in which :
1-3.2.1--Ditch Condition
The ditch condition is the most common method of installing castiron pipe and is the basis of the earth loads shown in Table 1-8. The load is obtained by selecting the lesser of the two loads computed by Eq 8 and 9.
IP, = C#uB (ditch condition) (8)
II', = C,wB,* (positive projection
condition)
(9)
K = ratio of active horizontal pressure at any point in the fill to the vertical pressure which causes the active horizontal pressure
a' = coefficient of sliding fric tion between fill materials and sides of trench
Kn' = 0.130 for standard calcu lations
* Spangler. M. G. Soil Engineering. International Textbook Co., Scranton, Pa. (2nd ed., 1960). p. 416.
CTD000299
58 AMERICAN NATIONAL STANDARD
e = the base of natural logarithms (2.71828)
H = depth of cover to top of pipe
(ft).
The calculation coefficient, Ce, is
obtained from Fig. 1-9 or from the following equation:
in which:
r,d = settlement ratio* p = projection ratio*
For standard calculations the value of the product rtip is taken to be 0.75. For this value, the height of equal
settlement calculated by Eq 13 is, H, = 1.75 Be and Eq 12 reduces to:
Ce = 1.961 ^ - 0.934
(12a)
or
in which:
n = coefficient of internal fric tion in fill materials
Kfi -- 0.1924 for standard calcu
lations
H, -- Height of equal settlement
(ft) (vertical height from the top of conduit to the level at and above which the fill materials directly over the conduit settle equally with the adjacent fill materials).
Equation 11 is used when the height
of fill, H, is equal to or less than the height of equal settlement, He. Equa
tion 12 is used when the height of fill,
H, is greater than the height of equal settlement, H,,
The height of equal settlement, He,
is obtained from the following equa tion :
" B` -2K? j = IK^rup) + 1 (13)
In most cases Eq 12a is used to calcu
late Ce becuase the depth of cover
usually exceeds 1.75 times the pipe outside diameter.
Table 1-8 and Fig. 1-10 show earth loads computed by the above proced ures for cast-iron pipe laid in trenches with widths, Bi, equal to the nominal pipe diameter plus 2 ft. Figure 1-11 shows a chart of earth loads computed by the above procedures for pipe in stalled in trenches where Bi is equal to the nominal pipe diameter plus 1 ft.
Figures 1-12 and 1-13 show charts computed by the above procedures for pipe laid in trenches with sides sloped 1:1 and 2:1, respectively.
For standard calculations, Kfi = 0.1924 is used for C, and Kfi' = 0.130 is used for Ci in order to obtain conservative earth loads.
Other values of Kfi and Kfi, which
may be used in calculating earth loads for special soil conditions, are shown below with the corresponding soil type:
Soil Type
Value of Km or Km'
Granular materials without cohesion
Sand and gravel, maximum
0.1924 0.165
* For a definition of these terms see: Spangler, M. G. Sod Engineering. Inter national Textbook Co., Scranton, Pa. (2nd ed., 1960). p. 403.
CTD000300
THICKNESS DESIGN OF CAST-IRON PIPE
59
Saturated top soil, maximum Clay, ordinary maximum Saturated clay, maximum
0.150 0.130 0.110
1-3.2.2--Positive-Projection Embank ment
The positive-projection condition may be encountered with pipe laid on top of a subgrade and covered with fill for highway or dam construction. The earth load is calculated from Eq 9 using Eq 12a for calculation of Cc when standard values of r,dp and Kn are used. For such standard values the load may also be read directly from Fig. 1-12 which was constructed from loads computed by Eq 9. The loads in Fig. 1-12 are based on soil weighing 110 lb/cu ft and may be ad justed to soil of 120 lb/cu ft by multi plying the graph load by 120/110. For calculation of pipe thicknesses, special load factors are used for posi tive projection embankment condition as shown in Table 1-9.
1-3.2.3--Negative-Projection Embank ment Condition
The negative-projection embank ment condition may be encountered in highway or dam construction when the pipe is laid in a relatively narrow trench cut in the subgrade, a more de sirable method than installation di rectly on top of the subgrade. Loads for negative projection are calculated as follows.
W. - C,,wB/
(U)
in which:
C,, = calculation coefficient (neg ative projection condition).
Other terms are as defined for Eq 8 and 9.
of p' and H/Bi have been determined as follows:
pf = h/Bi h = depth of cover in trench
from top of pipe to sub grade (ft) H = total height of fill from top of pipe to top of embank ment (ft) Bi -- width of subgrade trench at top of pipe (ft)
Equation 14 is considered to give the maximum load that could occur on pipe laid in trenches under embank ment conditions such as the case of embankment or additional fill added at some time, generally years, after the pipe was laid as a ditch conduit and backfill placed. In many em bankment cases, Eq 14 may give loads which are too conservative.
In cases where pipe is laid in a sub grade trench with the embankment completed shortly thereafter, the load may be closer to that given by Eq 8 for ditch condition, and the embank ment fill above the subgrade trench may be considered as equivalent to an increase of the trench width above the top of the pipe without significant effect on the earth load.
For other cases the load may lie somewhere between those given by Eq 8 and Eq 14. The correct load depends largely on relative soil com paction in the subgrade trench and overlying embankment and selection of the proper load (or pipe design will be governed by engineering judgment based on the specific factors in each installation.
1-3.2.4--Sample Calculation of Earth Load
The calculation coefficient, Cn, is
Determine earth load on 12-in. cast-
read from Fig. 1-14 after the values iron pipe with 5 ft of cover. Pipe laid
CTD000301
60 AMERICAN NATIONAL STANDARD
in a flat-bottom trench (d + 2) ft wide.
Step 1. Calculate earth load for ditch condition using Eq 8.
- 2K*`
\-e
Bi
IKy!
AV = 0.130 H=5 ft
(10)
Sj = --+2 = 3 ft
,r- 2(0.130)
,, 1-e
V3/ 0.3516 ,
2(0.130)
~ 0.260 "1,35
W.^CiwBJ
= 1.35(120)(3)1
= 1,460 Ib/ft
(8)
Step 2. Calculate earth load for projection condition using Eq 9.
H. = 1.75 Bc = 1.75 (^)
= 1.75(1.10) = 1.92 ft
H is greater than H,, therefore use Eq 12 or 12a to calculate Cc. Using Eq 12a:
Cc = 1.961 - 0.934
(12a)
- (n) -0 934
= 7.98 W. = CeviB?
= 7.98 (120KU0)1 = 1,159 lb/ft
(9)
Step 3. Select lesser load from Step 1 or 2. The load for projection condition is the lesser. Therefore, the earth load, We, is 1,159 lb, ft. This load is shown in Table 1-8.
Sec. 1-3.3--Truck Superloads (W,)
The procedures in this section may bc used to compute truck superloads
for unpaved roads, flexible pavement or rigid pavement; one truck or two passing trucks; and any wheel load and impact factor. For unpaved road or flexible pavement Eq 15 is used. For rigid pavement Eq 16 is used.
IV, = CRPF
(15)
W, = KB.PF
(16)
in which:
IT.
Wt = Truck superload (lb/lin ft) C = Surface load factor for un paved road or flexible pave ment (for one truck, see Table 1-11; for two trucks, see Table 1-12). B ~ Reduction factor which takes account of the fact that the part of the pipe directly below the wheels receives the truck super load in its full intensity but
is aided in carrying the
load by adjacent parts of the pipe that receive little
or no load from the truck.
(See Table 1-13.) f - Wheel load (lb)
Impact factor = Surface load factor for
rigid pavement (see Table 1-14).
B` = Outside diameter of pipe (ft) (see Table 1-15).
Equations 15 and 16 may be used in computing AASHO truck loading which is described in "Standard Specifications for Highway Bridges," American Assn, of State Highway Officials, 1961. The wheel loads and impact factors to be used in the equa tions are given in Art. 1.2.5 and
CTD000302
THICKNESS DESIGN OF CAST-IRON PIPE
61
1.2.12 of the AASHO specification, as follows :
AASHO Truck
H-10 H-15 H-20
Gross Weight
10 tons 15 tons 20 tons
Depth of Cover
0 ft to 1 ft, 0 in. 1 ft, 1 in., to 2 ft, 0 in. 2 ft, 1 in., to 2 ft, 11 in.
3 ft, 0 in., or more
Wheel Load, P
8,000 lb 12,000 lb 16,000 lb
Impact Factor, F
1.30 1.20 1.10 1.00
The truck superload allowances given in Tables 1-4 and 1-8 are in tended for standard conditions.
They are based on two passing trucks with adjacent wheels 3 ft apart, 9,000-lb wheel load, unpaved road or flexible pavement, 1.50 impact factor. These loads in most cases equal or exceed the static load from a single AASHO H-20 truck with 16,000 lb on each rear wheel. These truck super loads are based on having the design
depth of cover over the pipe. Con sideration should be given to the loads that may be transmitted to the pipe if either truck superloads or heavy construction equipment is per
mitted to pass over the pipe at less than the design depth of cover.
CTD000303
62 AMERICAN NATIONAL STANDARD
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CTD000304
THICKNESS DESIGN OF CAST-IRON PIPE
63
TABLE 1-9 Load Factors for Cast-Iron Pipe in Ditch and Embankment Conditions
Pipe
Size in.
H* B
Laying Condition A BF
Load Factor (L/)
Pipe Size in.
H* B%
Laying Condition ABF
Load Factor (./)
Ditch and Negative Projection Conditions!
3 1.15 1.28 1.74 4 1.15 1.29 1.75 6 1.15 1.32 1.78 8 1.15 1.34 1.80 10 1.15 1.36 1.83
12 1.15 1.38 1.85 14 1.15 1.41 1.88 16 1.15 1.43 1.90 18 1.15 1.45 1.93 20 1.15 1.47 1.95
24 1.15 1.52 2.00 30 1.15 1.58 2.08 36 1.15 1.64 2.14 42 1.15 1.69 2.20 48 1.15 1.72 2.25
Ditch and Negative Projection Conditions! (Continued)
54 1.15 1.75 2.29 60 1.15 1.77 2.31
Positive-Projection Condition!
0.5 1.50 2.16 1.0 1.36 1.84 1.5 1.29 1.74 2.0 1.26 1.68 3.0 1.26 1.64
5.0 1.26 1.60 10.0 1.26 1.58
* H i depth of cover to top of pipe, in feet; B. is outside diameter of pipe, in feet (see Table X--IS), t See Fig. 1-7 and See Sec. 1-3.2.
Pipe Size in.
3-10 12-14 16-18
20
TABLE 1-10 Allowances for Surge Pressure
Surge Pressure psi
120 110 100
90
Pipe Size in.
24 30 36 42-60
Surge Pressure psi
85 80 75 70
CTD000305
64
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AMERICAN NATIONAL STANDARD
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04 f-
Q* VO VO $hp*NN
^ 00 CM O
Tp VO VO <0 iflOh-ooa
N 1-* M dd
-i PO vO -< N H N (S fO O
O N N N 00 rO ^ ^ lO ip
O
00 ^ PO <0 PO 'OOOO'O^ O -M ^
so CM CM
Tp t-*. vo <0 -- CM PO
O
00 VO --f 00 lO
d
r- cm t- O' CK 00 - CM PO O ^.
d
r-- o rp vo
Is =1
uC
I>f u4 fa C .. f"Cc-oOo' iuf --.
ST .2,
is
8 5
2.3
gc
c--
cn
rTspfrOf rtf}<i T10p
fO P4 N 00 Of- 00 ^ O'
PO CM 00 O O
-'O^'ON
00 0* 0- 00
(N
odd odd d d *
so
C4
oO 'f OO 't fN ^ O f
O' N N O^^^
OVO *t-N- 0000O O-H r" -M N fs
O CM CM
CM Ol
5S So
d d o'
| rOTfOCCO
N ^ O 00 O
CM
O O CN 00 CM PO PO *P -p
-f
lO O
J
I)
I)
CTD000306
t
T A B L E 1-12 Surface Load Factors (C ) fo r Two Passing Trucks on Unpaved Road or Flexible Pavement
tionai Textbook Co,, Scranton, Pa.)
THICKNESS DESIGN OF CAST-IRON PIPE
65
10 0 ^ 0 O O O - -- t- f*. r- cn O O
za
(N
0 p- tN M OOOOO OOOOO
fO ^'t n 0 OOOOO OOOOO
OO O00 OOs -*4H r-No OOOOO
^ VO OO
*3
5=
OOOOO* OOOOO OOOOO o' d
8o c<o
32
iiOCN
0 ^ -n CN PO OOOOO OOOOO
Oi'OO'O^ m^'C'ON OOOOO OOOOO
OOIONN 00 0 CN V) *N. OOOOO
00 O-n' C*N* OO
0 0 0 0 d OOOOO d d d d d d d
SS
O
-- cq ro T* 55 00005
-O f- O' 0 CN *^ -- OOOOO
PO 0 O' fO 0 4 04 N OOOOO
00 0 CN fO OO
3
d 0 0 d 0 OOOOO d d d d o' o' d
e
e
is in n
^ONTfO O T-4 OOOOO
& 00 00 n 04 m fn rn OOOOO
4* IN. 33
n <*0
O O O O 0 OOOOO OOOOO d d
Me5 Mva i
.O
w>
n
i/> fn
0
^
h
S8oo
N*4 ^P4"*64 OINi NfS OOOOO
NO <N 00 T* cn *> *o tn OOOOO
r- - 10 0 OO
oo
4J
3a
OOOOO OOOOO doddd d d
a'o
2
40
fO
h*
-N
nn
^-n
OOOOO
OOO^NN IN M N N fn OOOOO
O N O' tN po^intno OOOOO
** -N r- 00 OO
si S5
0 OOOOO OOOOO OOOOO 0 d
<0
u. 0
VO (OOOlO^OrtNNOOOOO
NtN -fO4 O r*Nf 0T0f OOOOO
po ^ m n fN in 0 fN 00 O' OOOOO
co r-- O
OOOOO OOOOO 0 o* o' o* d d 0* 8
u C/J W)
Tf 0 Tf M 00 O O -- cn cn OOOOO dodo
N* O O CN O ^ 4 vn 0
OOOOO ddddd
in O n co pn O 00 O' O M O O O -N -- OOOOO
n <r> ^ o' d
.5 c -c j3 - a
IOO OO' N0 ^0fO0 OOOOO
NIANOO f ifl'ONOO OOOOO
N N ts O f' O' O M ^ IO ^N vN VN
0|N. 00 ^N
av
M8
OOOOO OOOOO OOOOO d d
.Ud5 J^v2
0 CN 0 0
O T#i o CN 00 O CN
4R <0
0^ OOOOO
in 0 00 O' OOOOO
O CM ^ O tN
ONN' 0CN
OOOOO d d d d d doddd o* 0
si
flO'ON'^'O O -- <0 rj* 10 OOOOO d d ddd
0 co 0 - n in. r> Ci O --1 O O O NN -n dodo d
O mD O' 00 vo CNM ^H -O1OOO doddd
0 00 -h CN CN CN dd
OV JS i
<N
CN
an J5
fS CS (N 90 CS *- m in OOOOO o' dodo
OOOONO
000
OO'
-N
CN
--
<-Nn
ddddd
04 O CM 00 ^ i*n4 nM (0N C<nM pCMo doddd
*4* vO r#* to CN CN 0d
^ JN 0O O !N - fn >n r> O' OOOOO ddddd
cotsoon ONPOif'O ddddd
U0 CM LO ~N c-o C-4M pCoM iMn C0M doddd
-N n- 00 CN CN dd
"T tt O CO O m 0 00 0
O (N 00 4** 0
cm pn 'n t t VO O
*
rt ti n "O Suri 3-- ---a aty> H.i
CTD000307
66 AMERICAN NATIONAL STANDARD
TABLE 1-13 Reduction Factors (R)
Pipe Size in.
Depth of Cover--ft
21-31
4-7
8-10
>10
Reduction Factor
Pipe
Size in.
21-31
Depth of Cover--ft
4-7 8-10
>10
Reduction Factor
3-12 14 16 18
1.00 0.92 0.88 0.85
1.00 1.00 0.95 0.90
1.00 1.00 1.00 1.00
1.00 1.00 1.00 1.00
20 24-30 36-60
0.83 0.81 0.80
0.90 0.85 0.85
0.95 0.95 0.90
1.00 1.00 1.00
TABLE 1-14 Surface Load Factors (K) For One Truck and Two Passing Trucks on Rigid Pavement*
Depth of
Cover
ft
One Truck
Two Passing Trucks
Pavement Thickness--in.
Pavement Thickness--in.
4 6 8 10 4 6 8 10
Surface Load Factor
2 0.0244 2* 0.0213 3 0.0186
0.0149 0.0139 0.0126
0.0101 0.0097 0.0090
0.0076 0.0072 0.0070
3i 0.0164 4 0.0144
5 0.0114
0.0114 0.0102 0.0084
0.0085 0.0079 0.0066
0.0066 0.0061 0.0054
6 0.0093 0.0071 0.0057 0.0047 8 0.0065 0.0052 0.0043 0.0036 10 0.0046 0.0039 0.0033 0.0029
12 0.0034 0.0030 0.0026 0.0023 16 0.0022 0.0019 0.0017 0.0016 20 0.0013 0.0011 0.0010 0.0009 24 0.0008 0.0007 0.0006 j 0.0005
0.0410 0.0364 0.0333
0.0290 0.0262 0.0210
0.0170 0.0114 0.0080
0.0059 0.0034 0.0024 0.0015
0.0263 0.0246 0.0228
0.0206 0.0187 0.0156
0.0133 0.0097 0.0070
0.0054 0.0032 0.0023 0.0014
0.0186 0.0177 0.0167
0.0156 0.0146 0.0123
0.0107 0.0081 0.0062
0.0049 0.0030 0.0022 0.0013
0.0142 0.0136 0.0129
0.0122 0.0117 0.0102
0.0088 0.0069 0.0055
0.0045 0.0028 0.0021 0.0012
* These factors were computed by the methods explained in "Vertical Pressure on Culverts under Wheel Loads on Concrete-Pavement Slabs", Bull, ST65, Portland Cement Assn., Chicago, 111. In Bulletin ST65, K if expressed as c/L*. These factors are based on a modulus of subgrade reaction of 100 Ib/cu in. and a modulus os elasticity of 4,000,000 psi for the pavement concrete. The factors for two passing trucks are based on the inside rear wheels passing 3 ft apart.
THICKNESS DESIGN OF CAST-IRON PIPE
67
TABLE 1-15 Outside Diameters of Cast-Iron Pipe
Pipe
Size in.
Outside Diameter
in.
Outside Diameter (B)
ft
Pipe
Size in.
Outside
Diameter in.
Outside Diameter (B.)
ft
3
3.96
0.330
20
21.60
1.800
4
4.80 0.400
24
25.80
2.150
6
6.90 0.575
30
32.00
2.667
8
9.05 0.754
36
38.30
3.192
10
11.10
0.925
42
44.50
3.708
12
13.20
1.100
48
50.80
4.233
14
15.30
1.275
54
57.10
4.758
16
17.40
1.450
60
63.40
5.283
18
19.50
1.625
Fig. 1-6. Load-Pressure Curve The parabola represents the relation be tween external load and internal pressure
at the point of breaking.
CTD000309
68 AMERICAN NATIONAL STANDARD
Natural Ground Surface
Natural Ground Surface
A
|A|
S
0 1 2 3 45
(d) (e>
Fig. 1-7. Installation Conditions for Earth' Load Calculations
Fig. l-7(a)-(c) are for ditch conditions; Fig. 1-7(d) and (e) are for positive and negative projection embankment con
ditions, respectively.
Fig. 1-8. Calculation Coefficients (C,,) for Ditch Condition
Curve A is for Cd for K/jl and K^' of 0.1924, the minimum for granular ma terials without cohesion; Curve B, Cd for Kn and Kp of 0.165, the maximum for sand and gravel; Curve C, Cd for Kp. and Kfx,' of 0.150, the maximum for saturated topsoil; Curve D, Cd for Kp and Kp' 0} 0.130, the ordinary maximum for clay; and Curve E, Cd for Kp and Kpr of 0.110, the maximum for saturated clay.
CtDOOO^0
THICKNESS DESIGN OF CAST-IRON PIPE
69
0123456789 Cc
10
Fig. 1-9. Calculation Coefficients (C.) for Positive-Projection Condition The values of Cc may also be determined by Eg 11 or Eg 12, given in the text.
CTD000311
Fig. 1-10. Earth Loads on Pipe for Trench Width of (d + 2) ft
Values associated with each curve are for pipe size, in inches. It is assumed that the
unit weight of fill is 120 Ib/cu ft, that Kp. equals 0.1924 and
equals 0.120, and that
r,dp is 0.75 for all sizes. Be is pipe OD. For 3- and 8-60-in. pipe, OD is as shown
in Table 1-15. OD of 4- and 6-in. pipe is 5.00 and 7.10 in., respectively.
)
70
CTD000312
THICKNESS DESIGN OF CAST-IRON PIPE
71
Load-1 ,0 0 0 Ib /lin (1
Fig. 1-11. Earth Loads on Pipe for Trench Width of (d + 1) ft Values associated with each curve are for pipe size, in inches. It is assumed that the unit weight of fill is 120 Ib/cuft, that K^i equals 0.1924 and K/x equals 0.130. For wide ditches, rsdp is 0.75. Bc is pipe OD. For 3- and 8-60-in. pipe, OD is as shown
in Table 1-15. OD of 4- and 6-in. pipe is 5.00 and 7.10 in., respectively.
CTD000313
L o a d -1,000 Ib /lln ft
72 AMERICAN NATIONAL STANDARD
ft ft
Tig. 1-12, Earth Loads on Pipe In Trench With 1:1 Side Slopes Values associated with each curve are {or pipe size, in inches. It is assumed that the unit weight of fill is 110 Ib/cuft; this load may be adjusted to soil of 120 Ib/cuft by multiplying the graph load by 120/110. For wide ditches, ridp is 0.75. Kp equals 0.1924, Kfj! equals 0.130. Bc is pipe OD. For 3- and 8-60-in. pipe, OD is as shown
in Table 1-15. OD of 4- and 6-in. pipe is 5.00 and 7.10 in., respectively. CTD000314
THICKNESS DESIGN OF CAST-IRON PIPE
73
Load-1 ,0 0 0 Ib /lin U
Fig. 1-13. Earth Loads on Pipe in Trench With 2:1 Side Slopes Values associated with each curve are for pipe size, in inches. It is assumed that the unit weight of fill is 120 Ib/cu ft. For wide ditches, r>dp equals 0.75. Kp equals 0.1924, Kp' equals 0.130. Bc is pipe OD. For 3- and 8-60-in. pipe, OD is as shown
in Table 1-15. OD of 4- and 6-in. pipe is 5.00 and 7.10 in., respectively.
CTD000315
74 AMERICAN NATIONAL STANDARD
0 1 2 3 4 5 6 7 8 9 IQ Load Coefficient (C,,)
Fig. 1-14. Calculation Coefficients (0,) for Negative-Projection Conditions
The values associated with the five curves to the right are for p'. K^' equals 0.130.
r.dP equals 0.0.
CTD000316
Sec. 1-4--Thickness Determination for Pipe on Piers or Piling Aboveground or Underground
Sec. 1-4.1--Scope
This section gives the procedures for determining the net thickness of cast-iron pipe supported at intervals rather than continuously. These pro cedures are applicable to pipe in stalled on piling bents and piers, with or without earth cover, as well as to pipe installed on bridges and other structures with hangers and other types of spaced supports.
Sec. 1-4.2--Pipe Installed Above ground Without Earth Cover
a. Determine the ring test load equivalent of external load, including 2.5 safety factor, as follows:
w
in which:
2,5 {W,+ Wm)
L,
(17)
w = ring test load equivalent (lb/ft)
Wp = weight of pipe (lb/ft) (see Table 1-16)
W,, = weight of contained water (lb/ft) (see Table 1-16)
Lf -- load factor (see Table 1-17)
Sec. 1-4.3--Pipe Installed Under ground With Earth Cover
Thicknesses are computed for two cases as described in Sec. 1-2.2 and the larger of the two thicknesses is used for design.
Case 1:
a. Determine the ring test load equivalent from the following formula :
2.SW.
w Lf
(18)
in which:
w = ring test load equivalent db/ft)
W, = earth load (see Table 1-8) Lf = load factor (see Table
1-17)
b. Select the internal pressure to* Case 1 from Table 1-5 which includes surge pressure and 2.5 safety factor.
c. Enter the above values of ring test load equivalent and internal pressure in the appropriate nomogram and read the net thickness.
Case 2:
b. Select the internal pressure for Case 1 from Table 1-5 which includes surge pressure and 2.5 safety factor.
c. Enter the above values of ring test load equivalent and internal pres sure in the appropriate nomogram and read the net thickness. To ob tain total calculated thickness, cor rosion allowance and casting tolerance are added to this net thickness as described in Sec. 1-2.2.
a. Determine the ring test load equivalent from the following formula:
2.5 (W, + W,) w =--------------------------
Lf
(19)
in which W, is the truck superload in pounds per foot (see Table 1-8) and other factors are as defined for Eq 18.
b. Select the internal pressure for Case 2 from Table 1-5 which includes a safety factor of 2.5.
75
CTD000317
ANSI A21.50-1976 (AWWA C150-76)
Revision of A21.50-1971 (AWWA 050-71)
AMERICAN NATIONAL STANDARD
iot ffae
THICKNESS DESIGN OF DUCTILE-IRON PIPE
Secretariats
AMERICAN GAS ASSOCIATION AMERICAN WATER WORKS ASSOCIATION NEW ENGLAND WATER WORKS ASSOCIATION
Revised edition approved by American National Standards Institute, Inc. Aug. 4, 1976
PUBLISHED BY
AMERICAN WATER WORKS ASSOCIATION
6666 West Quincy Avenue, Denver, Colorado 80235
CTD000321
American National Standard
An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertising and promotion ma terial or on tags or labels that the goods are produced in conformity with particular American National Standards.
CAUTION NOTICE. This American National Standard may be revised or with
drawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five (5) years from the date of publication. Purchasers of American National Stan dards may receive current information on all standards by calling or writing the American National Standards Institute, 1430 Broadway, New York, N.Y. 10018,
(212) 868-1220.
Copyright 1976 by the American Water Works Assn. Printed in US il
CTD000322
Committee Personnel
Subcommittee 1, Pipe, which reviewed this standard, had the following per sonnel at that time:
Edward C. Sears, Chairman Walter Amory, Vice-Chairman
User Members
Robert S. Bryant Frank E. Dolson George F. Keenan Leonard Orlando Jr. John E. Perry
Producer Members
Alfred F. Case W. D. Goode Thomas D. Holmes Harold Kennedy J r. W. Harry Smith Sidney P. Teague
Standards Committee A21, Cast-Iron Pipe and Fittings, which reviewed and approved this standard, had the following personnel at the time of approval:
Lloyd W. Weller, Chairman Edward C. Sears, Vice-Chairman James B. Ramsey, Secretary
Organization Represented
American Gas Association American Society of Civil Engineers American Society of Mechanical Engineers American Society for Testing and Materials American Water Works Association
Cast Iron Pipe Research Association
Individual Producer Manufacturers' Standardization Society of
the Valve and Fittings Industry New England Water Works Association Naval Facilities Engineering Command Underwriters' Laboratories, Inc. Canadian Standards Association
Name of Representative
Leonard Orlando Jr. Kenneth W. Henderson James S. Vanick H. M. Cobb* Arnold M. Tinkey Lloyd W. Weller Thomas D. Holmes Harold Kennedy J r. Edward C. Sears W. Harry Smith Alfred F. Case
Abraham Fenster Walter Amory Stanley C. Baker John E. Perry W. F. SemenchukJ
* Alternate t Liaison representative without vote
m
CTD000323
Table of Contents
SEC.
PACE
Foreword............................................... vi
Standard
50--1 50-2
50-3
50-4
Scope.............................................. Procedure for CalculatingThick
ness Design Example forCalculating
Thickness..................................... Design Method..............................
1
1
2 3
Tables
50.1 Earth Loads P,, Truck Loads Pt, and Trench LoadsP,.........
50.2 Design Values for Standard Lay ing Conditions.........................
50.3 Allowances for Casting Tolerance 50.4 Reduction Factors R for Truck-
Load Calculations.................... 0.5 Standard Thickness Classes of
Ductile-Iron Pipe.....................
6
8 8
8
10
SEC.
PACE
50.6 Surface-Load Factors for Single Truck on Unpaved Road.......... 11
50.7 Diameter-Thickness Ratios for Laying Condition Type 1......... 12
50.8 Diameter-Thickness Ratios for Laying Condition Type 2......... 14 '
50.9 Diameter-Thickness Ratios for Laying Condition Type 3......... 16
50.10 Diameter-Thickness Ratios for Laying Condition Type 4......... 19
50.11 Diameter-Thickness Ratios for Laying Condition Type 5......... 22
50.12 Thickness for Earth Load Plus Truck Load..................................... 26
50.13 Thickness for Internal Pressure 31 50.14 Rated Working Pressure and
Maximum Depth of Cover. ... 32
Figures 1. Standard Pipe Laying Conditions..
9
v CTD000324
Foreword
This foreword, is for information only and is not a part of ANSI A21.50 {A IVIVA C150).
American National Standards Com mittee A21, Cast-Iron Pipe and Fit tings, was organized in 1926 under the sponsorship of the American Gas Association, the American Society for Testing and Materials, the American Water Works Association, and the New England Water Works Associ ation. Since 1972, the co-secretariats have, been A.G.A., AWWA, and NEWWA, with AWWA serving as the administrative secretariat. The present scope of Committee A21 activity is
Standardization of specifications for cast-iron and ductile-iron pressure pipe for gas, water and other liquids, and fittings for use with such pipe. These specifications to include design, dimensions, materials, coatings, lin ings, joints, accessories and methods of in spection and test.
The work of Committee A21 is con ducted by subcommittees. The di rective to Subcommittee 1--Pipe is that
The scope of the subcommittee activity shall include the periodic review of all current A21 standards for pipe, the preparation of re visions and new standards when needed, as well as other matters pertaining to pipe standards.
The first edition of A21.50, the standard for thickness design of duc tile-iron pipe, was issued in 1965 and a revision was issued in 1971. Sub committee 1 reviewed the 1971 edition and submitted a proposed revision to American National Standards Com mittee A21 in 1975.
Major Revisions
The basic design procedures are unchanged from the 1965 and 1971
editions. Certain design parameters have been changed to the following.
1. Trench load, which includes earth load and truck load, is expressed as vertical pressure in pounds per square inch. Earth loads for all pipe sizes are based on the prism load concept. Truck load is based on a single AASHTO* H-20 truck with 16 000-lb wheel load and 1.5 impact factor. Truck load is included at all depths of cover. In addition to tabu lated truck loads, equations are in cluded for complete calculation of truck loads.
2. The design ring bending stress is 48 000 psi, which provides safety factors under trench loading of at least 1.5 based on ring yield strength, and at least 2.0 based on ultimate strength of the material.
3. The design pipe deflection is 3 per cent of the outside diameter. Tests have shown that 3 per cent deflection is permissible without caus ing any damage to cement linings of ductile-iron pipe.
4. The standard laying conditions have been expanded to include five types. Types 1, 2, and 5 replace A, B, and S, respectively, in A21.50-1971. Types 3 and 4 have been added to provide a wider selection of laying conditions.
5. The design for internal pressure is based on a 2.0 safety factor. The design pressure is obtained by adding 100-psi surge allowance to the working pressure and multiplying the sum by the 2.0 safety factor. (If anticipated surge pressures are greater than 100
* American Association of State Highway and Transportation Officials.
VII
CTD000325
AMERICAN NATIONAL STANDARD
psi, the maximum anticipated pres sure must be used.) The resulting design pressure is then applied to the minimum yield strength in tension of 42 000 psi.
6. The standard thickness classes have been renumbered. Class 1 be comes Class 51, Class 2 becomes Class 52, and so on. Class 50 has been added for 6-54-in. pipe and Class 51
has been expanded to include 3-12-in. pipe.
7. The tables have been modified to reflect the preceding changes. Also, a table has been added to show rated working pressure and maximum depth of cover for all the standard laying conditions and standard thickness classes.
t
Vlll
cTO00^26
ANSI A21.50-1976 (AWWA Cl50-76)
Revision of A21.50-1971 (AWWA Cl 50-71)
American National Standard
for file
Thickness Design of Ductile-Iron Pipe
Sec. 50-1--Scope
This standard covers the thickness design of ductile-iron pipe complying with the requirements of ANSI A21.51 (AWWA, C151), "Ductile-Iron Pipe, Centrifugally Cast in Metal Molds or Sand-Lined Molds for Water or Other Liquids."
Section 50-2 outlines the design procedure and Sec. 50-3 gives a design example.
Section 50-4 explains the bases of design.
As opposed to using procedures in Sec. 50-2 or 50-4, the designer may reference Tables 12-14 directly.
Table 12 lists thicknesses for stan dard laying conditions and depths of cover up to 32 ft.
Table 13 lists thicknesses for 150-- 350 psi water working pressure.
The greater thickness from Table 12 or 13 for given trench load or internal pressure should be used.
Table 14 lists working pressures and maximum depths of cover for standard laying conditions and thick ness classes.
Sec. 50-2--Procedure for Calculating Thickness
The thickness of ductile-iron pipe is determined by considering trench load and internal pressure separately.
50-2.1 Step 1--Design for trench load.
a. Determine trench load P,. Table 1 gives trench load, including earth load, P,, plus truck load Pt, for 2.5-32 ft cover.
b. Determine the standard laying condition from the descriptions in Table 2 and select the appropriate table for diameter-thickness ratios from Tables 7-11. Each table lists diameter-thickness ratios calculated for both bending stress and deflection over a range of trench loads.
c. For bending stress design, enter the column headed "Bending Stress Design" in the appropriate table of Tables 7-11 and locate the tabu lated trench load, P,, nearest to the calculated P, from paragraph 502.1.a. (If the calculated P, is half way between two tabulated values, use the larger P,, value.)
1
CTD000327
2 AMERICAN NATIONAL STANDARD
Select the corresponding-^- value for
this P,.
Divide the pipe's outside diameter D
D (Table 5) by the -- value to obtain
the net thickness t. d. For deflection design, enter the
column headed "Deflection Design" in the appropriate table of Tables 7-11 and locate the tabulated trench load,
P,, nearest to the calculated P, from
paragraph 50-2.1.a. (If the calcu
lated P, is less than the minimum P,
listed in the table, design for trench load is not controlled by deflection and this determination need not be com
pleted.) If the calculated P, is half
way between two tabulated values,
use the larger P, value.
D Select the corresponding -- value for
n this P,.
Divide the pipe's outside diameter D
D (Table 5) by the -- value to obtain
*i
minimum manufacturing thickness t\. Deduct 0.08-in. service allowance to obtain net thickness t.
e. Compare the net thicknesses from steps c and d and select the larger of the two. This will be the net thickness required for trench load.
50-2.2 Step 2--Design for internal pressure. Calculate the net thickness required for internal pressure using the equation for hoop stress:
in which t is net thickness in inches;
Pi is the design internal pressure,
which is equal to the safety factor of 2.0 times the sum of working pressure (Pa) in pounds per square inch, plus
100 psi surge allowance (P.) for water pipe. That is, P, = 2.0 (Pa + P,).
If anticipated surge pressures are greater than 100 psi, then the maxi mum anticipated pressure must be used. D is outside diameter of pipe in inches, and S is minimum yield strength in tension (42 000 psi).
50-2.3 Step 3--Selection of net thickness and addition of allowances.
a. Select the net thickness t from step 1 or 2, whichever thickness is larger.
b. Add the service allowance of 0.08 in. to the net thickness t. The resulting thickness is the minimum manufacturing thickness ti.
c. Add the casting tolerance from Table 3 to the minimum manufactur ing thickness ti. The resulting thick ness is the total calculated thickness.
50-2.4 Step 4--Selection of stan dard thickness and class. Use the total calculated thickness from Sec. 50-2.3.c to select a standard class thickness from Table 5. Select the standard thickness nearest to the calculated thickness. When the calculated thick ness is halfway between two standard thicknesses, select the larger of the two.
In specifying and ordering pipe, use the class number listed in Table 5 for this standard thickness.
Sec. 50-3--Design Example for Calculating Thickness
Problem : Calculate the thickness for 30-in. ductile-iron pipe laid on a flatbottom trench with backfill lightly consolidated to centerline of pipe, lay ing condition Type 2, under 10 ft of cover for a working pressure of 200 psi.
50--3.1 Step 1--Design for trench load.
a. Earth load (Table 1) P, Truck load (Table 1) Pt
= 8.3 psi = 0-7 psi
Trench load, P, = P, + Pi = 9.0 psi
CTOOOO^
THICKNESS DESIGN OF DUCTILE-IRON PIPE
3
b. Select Table 8 for diameterthickness ratios for laying condition Type 2.
c. Entering P, of 9.0 psi in Table 8, the bending stress design requires
-- of 128. From Table 5, diameter D of 30-in. pipe is 32.00 in.
Net thickness t for bending stress D 32.00
- d = -nr " -2j
t d. Also, from Table 8, the deflec-
D tion design requires -- of 108.
n
Minimum thickness ti for deflection design D 32.00 D 108 0.30 in.
h
Deduct service allowance
--0.08 in.
Net thickness t for deflection control 0.22 in
e. The larger net thickness is 0.25 in., obtained by the design for bending stress.
50-3.2 Step 2--Design for internal pressure.
Pi -- 2.0 (Working pressure + 100 psi surge allowance)
(If anticipated surge pressures are
greater than 100 psi, then the actual
anticipated pressures must be used.)
Pi = 2.0 (200 + 100) = 600 psi PiD 600 X 32.00
1 ~ IS ~ 2 X 42 000
0.23 in.
Net thickness t for internal pressure is 0.23 in.
50-3.3 Step 3--Selection of net thickness and addition of allowances. The larger of the thicknesses is given by the design for trench load, Step 1, and 0.25 in. is selected.
Net thickness Service allowance
= 0.25 in. = 0.08 in.
Minimum thickness Casting tolerance
= 0.33 in. = 0.07 in.
Total calculated thickness = 0.40 in.
50-3.4 Step 4--Selection of stan dard thickness and class. The total calculated thickness of 0.40 in. is nearest to 0.39, Class 50, in Table 5. Therefore, Class 50 is selected for specifying and ordering.
Sec. 50-4--Design Method
50-4.1 The thickness of ductileiron pipe is determined by considering trench load and internal pressure separately.
Calculations are made for the thick nesses required to resist the bending stress and the deflection caused by trench load. The larger of the two is selected as the thickness required to resist trench load. Calculations are then made for the thickness required to resist the hoop stress of internal pressure.
The larger of these is selected as the net design thickness. To this net thickness is added a service allowance to obtain the minimum manufacturing thickness and a casting tolerance to obtain the total calculated thickness.
The standard thickness and the thickness class for specifying and ordering are selected from a table of standard class thicknesses.
The reverse of the preceding pro cedure is used to determine the rated working pressure and maximum depth of cover for pipe of a given thickness class.
50-4.2 Trench load, P,,. Trench load is expressed as vertical pressure in pounds per square inch, and is equal to the sum of earth load P, and truck load Pt.
50--4.3 Earth load, Pe. Earth load is computed by Eq 4 for the weight of the unit prism of soil with a height equal to the distance from the top of the pipe to the ground surface. The unit weight of backfill soil is taken to be 120 lb/cu ft. If the designer antici
CTD000329
4 AMERICAN NATIONAL STANDARD
pates additional loads because of frost, the design load should be in creased accordingly.
50-4.4 Truck load, Pt. The truck loads shown in Table 1 were computed by Eq 5 using the surface load factors in Table 6 and the reduction factors R from Table 4 for a single AASHTO H-20 truck on unpaved road or flexible pavement, 16 000-lb wheel load, and 1.5 impact factor. The surface load factors in Table 6 were calculated by Eq 6 for a single concentrated wheel load centered over an effective pipe length of 3 ft.
50-4.5 Design for trench load. Tables 7-11, the tables of diameterthickness ratios used to design for trench load, were computed by Eq 2 and 3. Equation 2 is based on the bending stress at the bottom of the pipe. The design bending stress / is
48 000 psi, which provides at least a 1.5 safety factor based on minimum ring yield strength and a 2.0 safety factor based on ultimate strength. Equation 3 is based on the deflection of the pipe ring section. The design deflection AX is 3 per cent of the out side diameter of the pipe, which is well below the deflection that might dam age cement linings. Design values of the trench parameters E', Kb, and Kx are given in Table 2.
Tables similar to Tables 7-11 may be compiled for laying conditions other than those shown in this stan dard by calculating the trench loads P, for a series of diameter-thickness
ratios, ^ and --, using Eq 2 and 3 t 11
with values of E', Kb, and Kz appro priate to the bedding and backfill conditions.
Design Equations
t
=
PiD IS
f
P. =
Kf)(f-0 Kb -
Kr 8E - + 0.732
(1)
(2)
,P. =
Ax
D
r 8 + 0.732E' (D ,V
12K Ah /
wH 120H H 144 144 ~ 1.2
C-R-P-F P, = 12 D
(3) (4) (5)
C,,
=
-31
--
--2 3t
. arcsin
r L
H
A'- + m + 1.5* (.42 + 77s) (ffs + 1.5s) .
+
7r fAs
AH + H*
-(-
1.5s t1.5s L
A*
+
Hl
+
J____ 1 H* +-I- 1.5s J
(6)
CTD0C0330
THICKNESS DESIGN OF DUCTILE-IRON PIPE
Explanation of Symbols for Equations
5
A = Outside radius of pipe in feet = --
C = Surface load factor (Table 6) D = Outside diameter in inches (Table 5) E = Modulus of elasticity (24 X 10* psi) E' = Modulus of soil reaction in pounds per square inch (Table 2) F = Impact factor--l.S I = Design bending stress--48 000 psi H = Depth of cover in feet Ki = Bending moment coefficient (Table 2)
= Deflection coefficient (Table 2) P - Wheel load--16 000 lb
= Earth load in pounds per square inch Pi = Design internal pressure in pounds per square inch = 2.0 (working pressure + 100
psi surge allowance) = Truck load in pounds per square inch i\ = Trench load in pounds per square inch = P. + Pt R = Reduction factor which takes account of the fact that the part of the pipe directly
below the wheels is aided in carrying the truck load by adjacent parts of the pipe that receive little or no load from the wheels (Table 4) 5 = Minimum yield strength in tension--42 000 psi t = Net thickness in inches <i = Minimum thickness in inches (t + 0.08) w = Soil weight--120 pounds per cubic foot
AX = Design deflection in inches (f =0.03)
Note : In Eq 6, angles are in radians.
CTD000331
6 AMERICAN NATIONAL STANDARD
Depth of
ft
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
Depth of
u
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
TABLE 50.1 Earth Loads P0, Truck Loads Pt, and Trench Loads P--psi
Pt
2.1 2.5 3.3 4.2 5.0 5.8 6.7 7.5 8.3 10.0 11.7 13.3 16.7 20.0 23.3 26.7
3-in. Pipe
Pi P.
9.9 12.0 7.4 9.9 4.4 7.7 3.0 7.2 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.6 10.6 0.4 12.1 0.3 13.6 0.2 16.9 0.2 20.2 0.1 23.4 0.1 26.8
4-in. Pipe
Pi P.
9.9 12.0 7.4 9.9 4.5 7.8 3.0 7.2 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.6 10.6 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
6-in. Pipe
Pi P.
9.9 12.0 7.3 9.8 4.4 7.7 3.0 7.2 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.6 10.6 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
8-in. Pipe
P. P,
9.8 11.9 7.3 9.8 4.4 7.7 3.0 7.2 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.6 10.6 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.S
Pt
2.1 2.5 3.3 4.2 5.0 5.8 6.7 7.5 8.3 10.0 11.7 13.3 16.7 20.0 23.3 26.7
10-in. Pipe
Pi P,
9.7 11.8 7.2 9.7 4.4 7.7 2.9 7.1 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
12-in Pipe
Pi P.
9.6 11.7 7.2 9.7 4.4 7.7 2.9 7.1 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
14-in. Pipe
Pi P.
8.7 10.8 6.6 9.1 4.4 7.7 2.9 7.1 2.1 7.1 1.6 7.4 1.2 7.9 1.0 8.5 0.8 9.1 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
16-in Pipe
p p.
8.2 10.3 6.2 8.7 4.1 7.4 2.8 7.0 2.0 7.0 1.5 7.3 1.2 7.9 1.0 8.5 0.8 9.1 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
CTD000332
*
#
Depth of Cover
ft
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
A
P.
2.1 2.5 3.3 4.2 5.0 5.8 6.7 7.5 8.3 10.0 11.7 13.3 16.7 20.0 23.3 26.7
2.5 3 4
A w
7 8 9 10 12 14 16 20 24 28 32
2.1
2.5 3.3 4.2 5.0 5.8 6.7 7.5 8.3 10.0 11.7 13.3 16.7
20.0 23.3 26.7
THICKNESS DESIGN OF DUCTILE-IRON PIPE
7
TABLE 50.1--(cont.)
18-in . Pipe
Pi p.
7.8 9.9 5.9 8.4 3.9 7.2 2.6 6.8 1.9 6.9 1.4 7.2 1.2 7.9 1.0 8.5 0.8 9.1 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
20-in. Pipe
Pi P.
7.5 9.6 5.7 8.2 3.9 7.2 2.6 6.8 1.9 6.9 1.4 7.2 1.1 7.8 0.9 8.4 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
24-in. Pipe
Pi P.
7.1 9.2 5.4 7.9 3.6 6.9 2.4 6.6 1.7 6.7 1.3 7.1 1.1 7.8 0.9 8.4 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
36-in. Pipe
Pi P.
6.2 8.3 4.9 7.4 3.4 6.7 2.3 6.5 1.7 6.7 1.3 7.1 1.1 7.8 0.8 8.3 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
42-in Pipe
Pi P.
5.8 7.9 4.6 7.1 3.3 6.6 2.3 6.5 1.7 6.7 1.3 7.1 1.0 7.7 0.8 8.3 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
48-in. Pipe
Pi p.
5.4 7.5 4.4 6.9 3.1 6.4 2.2 6.4 1.6 6.6 1.2 7.0 1.0 7.7 0.8 8.3 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
30-in. Pipe
Pi P.
6.7 8.8 5.2 7.7 3.5 6.8 2.4 6.6 1.7 6.7 1.3 7.1 1.1 7.8 0.9 8.4 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
54-in. Pipe
Pi P.
5.0 7.1 4.1 6.6 3.0 6.3 2.1 6.3 1.6 6.6 1.2 7.0 1.0 7.7 0.8 8.3 0.7 9.0 0.5 10.5 0.4 12.1 0.3 13.6 0.2 16.9 0.1 20.1 0.1 23.4 0.1 26.8
CTD000333
i
8 AMERICAN NATIONAL STANDARD
TABLE 50.2
Design Values for Standard Laying Conditions
Laying Condition*
Description
Type If Type 2 Type 3 Type 4
Type S
Flat-bottom trench.f Loose backfill. Flat-bottom trench. Backfill lightly con
solidated to centerline of pipe. Pipe bedded in 4-in.-minimum loose soil.
Backfill lightly consolidated to top of pipe. Pipe bedded in sand, gravel, or crushed
stone to depth of J pipe diameter, 4-in. minimum. Backfill compacted to top of pipe. (Approx. 80 per cent Standard Proctor, AASHTO T-99)** Pipe bedded to its centerline in compacted granular material, 4-in. minimum under pipe. Compacted granular or select^ material to top of pipe. (Approx. 90 per cent Standard Proctor, AASHTO T-99)**
Bedding E' Angle K.
deg
K,
150 30 0.235 0.108 300 45 0.210 0.105
400 60 0.189 0.103
500 90 0.157 0.096
700 150 0.128 0.085
* See Fig. 1.
(For pipe 30 in. and larger, consideration should be given to the use of laying conditions other than Type i. Flat-bottom is defined as "undisturbed earth."
Loose soil or select material is defined as "native soil excavated from the trench, free of rocks, foreign material, and frozen earth."
** AASHTO T-99, "Moisture Density Relations of Soils Using a 5.5 lb (2.5 kg) Rammer 12-in. (J05-mm) Drop."
TABLE 50.3
Allowances for Casting Tolerance
Size in.
3-8 10-12 14-42
48 54
Casting Tolerance in.
0.05 0.06 0.07 0.08 0.09
TABLE 50.4
Reduction Factors R for Truck Load Calculations
Size in.
Depth of Cover--ft
<4 4-7 8-10 >10 Reduction Factor
3-12 14 16 18 20 24-30 36-54
1.00 0.92 0.88 0.85 0.83 0.81 0.80
1.00 1.00 0.95 0.90 0.90 0.85 0.85
1.00 1.00 1.00 1.00 0.95 0.95 0.90
1.00 1.00 1.00 1.00 1.00 1.00 1.00
CTD000334
THICKNESS DESIGN OF DUCTILE-IRON PIPE
9
Type 2
Figure 1. Standard Pipe Laying Conditions See Table 2
CTD000335
10 AMERICAN NATIONAL STANDARD
TABLE 50.5
Standard. Thickness Classes of Ductile-Iron Pipe
Thickness Class
Size
in.
Outside
Diameter--in.
50
_3 3.96
4
4.80
--
6 6.90 0.25
8 9.05 0.27
10 11.10 0.29
12
13.20
0.31
14 15.30 0.33
16 17.40 0.34
18 19.50 0.35
20 21.60 0.36
24 25.80 0.38
30 32.00 0.39
36 38.30 0.43
42
44.50
0.47
48 50.80 0.51
54 57.10 0.57
51
0.25 0.26 0.28 0.30 0.32 0.34 0.36 0.37 0.38 0.39 0.41 0.43 0.48 0.53 0.58 0.65
52 53 54
Thickness--in.
0.28 0.31 0.34 0.29 0.32 0.35 0.31 0.34 0.37 0.33 0.36 0.39 0.35 0.38 0.41 0.37 0.40 0.43 0.39 0.42 0.45 0.40 0.43 0.46 0.41 0.44 0.47 0.42 0.45 0.48 0.44 0.47 0.50 0.47 0.51 0.55 0.53 0.58 0.63 0.59 0.65 0.71 0.65 0.72 0.79 0.73 0.81 0.89
55
0.37 0.38 0.40 0.42 0.44 0.46 0.48 0.49 0.50 0.51 0.53 0.59 0.68 0.77 0.86 0.97
56
0.40 0.41 0.43 0.45 0.47 0.49 0.51 0.52 0.53 0.54 0.56 0.63 0.73 0.83 0.93 1.05
CTD000336
THICKNESS DESIGN OF DUCTILE-IRON PIPE
11
TABLE 50.6
Surface Load Factors for Single Truck on Unpaved Road
Depth of Cover
n
2.5 3
4
5 6 7 8 9 10 12 14 16 20 24 28 32
Pipe Size--in.
3 4 6 8 10 12 14 16
Surface Load Factor--C
0.0196 0.0146 0.0088 0.0059 0.0042 0.0031 0.0024 0.0019 0.0015 0.0011 0.0008 0.0006 0.0004 0.0003 0.0002 0.0002
0.0238 0.0177 0.0107 0.0071 0.0050 0.0038 0.0029 0.0023 0.0019
0.0013 0.0010 0.0007 0.0005 0.0003 0.0002
0.0002
0.0340 0.0253 0.0153 0.0102 0.0072 0.0054 0.0042 0.0033 0.0027 0.0019 0.0014 0.0011 0.0007 0.0005 0.0003 0.0003
0.0443 0.0330 0.0201 0.0134 0.0095 0.0071
0.0055 0.0043 0.0035 0.0025 0.0018 0.0014 0.0009 0.0006 0.0005
0.0003
0.0538 0.0402
0.0245 0.0163 0.0116 0.0087 0.0067 0.0053 0.0043 0.0030 0.0022 0.0017 0.0011 0.0008 0.0006
0.0004
0.0634
0.0475 0.0290 0.0194 0.0138 0.0103 0.0079 0.0063 0.0051 0.0036 0.0027 0.0020 0.0013 0.0009 0.0007
0.0005
0.0726 0.0546 0.0335 0.0224 0.0159 0.0119 0.0092 0.0073 0.0060 0.0042
0.0031 0.0024 0.0015 0.0011 0.0008
0.0006
0.0814 0.0614 0.0379 0.0254 0.0181 0.0135 0.0104 0.0083 0.0068 0.0047 0.0035 0.0027 0.0017 0.0012 0.0009
0.0007
Depth of Cover
ft
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
Pipe Size--in.
18 20 24 30 36 42 48 54
Surface Load Factor--C
0.0899 0.0681 0.0422 0.0283 0.0202 0.0151 0.0117 0.0093 0.0076 0.0053 0.0039 0.0030 0.0019 0.0013 0.0010 0.0008
0.0980 0.0746 0.0464 0.0312 0.0223 0.0167 0.0129 0.0103 0.0084 0.0059 0.0043 0.0033 0.0021 0.0015 0.0011
0.0008
0.1130 0.0867 0.0545 0.0369 0.0264 0.0198 0.0154 0.0122 0.0100 0.0070 0.0052 0.0040 0.0025 0.0018 0.0013
0.0010
1
0.1321 0.1028 0.0657 0.0449 0.0323 0.0243 0.0189 0.0151 0.0123 0.0086 0.0064 0.0049 0.0032 0.0022 0.0016 0.0012
0.1479 0.1169 0.0761 0.0525 0.0381 0.0288 0.0224 0.0179 0.0147 0.0103 0.0076 0.0059 0.0038 0.0026 0.0019
0.0015
0.1604 0.1286 0.0853 0.0595 0.0435 0.0329 0.0258 0.0206 0.0169 0.0119 0.0088 0.0068 0.0044 0.0030 0.0022 0.0017
0.1705 0.1384 0.0936
0.0661 0.0486 0.0370 0.0290 0.0233 0.0191 0.0135 0.0100 0.0077 0.0050 0.0035 0.0026 0.0020
0.1784 0.1466 0.1008 0.0720 0.0534 0.0409 0.0322 0.0259 0.0213 0.0151 0.0112 0.0087 0.0056 0.0039
0.0029
0.0022
CTD000337
12 AMERICAN NATIONAL STANDARD
TABLE 50.7
Diameter-Thickness Ratios for Laying Condition Type 1*
Trench Load (P#)--psi
Trench Load (Pf)--psi
Bending Stress Design
4.40 4.43 4.46 4.50 4.54
4.57 4.61 4.64 4.68 4.72
4.76 4.80 4.84 4.88 4.92
4.96 5.00 5.04 5.08 5.13
5.17 5.21 5.26 5.30 5.35
5.40 5.45 5.49 5.54 5.59
5.65 5.70 5.75 5.80 5.86
5.91 5.97 6.03 6.09 6.15
6.21 6.27
Deflection Design
3.46 3.48 3.50 3.51 3.53
3.55 3.57 3.59 3.61 3.63
3.65 3.67 3.69 3.71 3.74
3.76 3.78 3.81 3.83 3.86
3.89 3.91 3.94 3.97 4.00
4.03 4.06 4.09 4.13 4.16
4.20 4.23 4.27 4.31 4.35
4.39 4.43 4.47 4.52 4.56
4.61 4.66
Of D t r !i
170 169 168 167 166
165 164 163 162 161
160 159 158 157 156
155 154 153 152 151
150 149 148 147 146
145 144 143 142 141
140 139 138 137 136
135 134 133 132 131
130 129
Bending Stress Design
6.33 6.40 6.46
6.53 6.60 6.67 6.74 6.82
6.89 6.97 7.05 7.13 7.21
7.29 7.38 7.47 7.56 7.65
7.75 7.85 7.95 8.05 8.16
8 27 8.38 8.49 8.61 8.74
8.86 8.99 9.13 9.27 9.41
9.56 9.71 9.87 10.03 10.20
10.37 10.55 10.74 10.93 11.13
Deflection Design
4.71 4.76 4.82
4 87 4.93 4.99 5.05 5.11
5.18 5.25 5.32 5.39 5.46
5.54 5.62 5.71 5.79 5.88
5 97 6.07 6.17 6.27 6.38
6.49 6.61 6.73 6.86 6.99
7.12 7.26 7.41 7.57 7.73
7.89 8.07 8.25 8.44 8.64
8.85 9.06 9.29 9.53 9.78
Df D
1 or tl
128 127 126
125 124 123 122 121
120 119 118 117 116
115 114 113 112 111
110 109 108 107 106
105 104 103 102 101
100 99 98 97 96
95 94 93 92 91
90 89 88 87 86
CTD000338
THICKNESS DESIGN OF DUCTILE-IRON PIPE
13
TABLE 50.7--(coni.)
Trench Load (Pi)--psi
Trench Load (P.)--psi
Bending Stress Design
Deflection Design
Dt D Torl7
Bending Stress Design
Deflection Design
>t D 1 0r h
11.34 11.55 11.78 12.01 12.25
12.50 12.76 13.03 13.31 13.60
13.91 14.23 14.56 14.91 15.27
15.65 16.05 16.46 16.89 17.35
17.83 18.33 18.85 19.40 19.98
20.59 21.23
10.04 10.31 10.60 10.90 11.22
11.56 11.91 12.28 12.67 13.08
13.51 13.97 14.45 14.96 15.50
16.07 16.68 17.32 18.00 18.73
19.50 20.32 21.19 22.12 23.12
24.18 25.32
85 84 83 82 81
80 79 78 77 76
75 74 73 72 71
70 69 68 67 66
65 64 63 62 61
60 59
21.91 22.63 23.38
24.18 25.02 25.92 26.86 27.87
28.94 30.07 31.28 32.57 33.95
35.42 37.00 38.69 40.50 42.46
44.56 46.84 49.30 51.96 54.86
58.02 61.46 65.23 69.36 73.92
26.54 27.85 29.26
30.77 32.39 34.15 36.05 38.10
40.32 42.73 45.35 48.20 51.31
54.72 58.44 62.53 67.03 71.99
77.47 83.54 90.28 97.80 106.20
115.62 126.21 138.18 151.73 167.15
58 57 56
55 54 53 52 51
50 49 48 47 46
45 44 43 42 41
40 39 38 37 36
35 34 33 32 31
* E* = ISO; Kb = 0.235; K 0.108. t The -- for the tabulated P> nearest to the calculated P is selected; when the calculated P* is halfway between
two tabulated values, the smaller -- should be used.
CTD000339
u AMERICAN NATIONAL STANDARD
TABLE 50.8
Diameter-Thickness Ratios for Laying Condition Type 2*
Trench Load (Pi)--pst
Trench Load (Pr)--pi.
Bending Stress Design
6.29 6.34 6.39 6.44 6.50
6.55 6.60 6.66 6.71 6.77
6.82 6.88 6.94 6.99 7.0S
7.11 7.17 7.23 7.29 7.35
7.42 7.48 7.54 7.61 7.67
7.74 7.80 7.87 7.94 8.01
8.08 8.15 8.22 8.29 8.37
8.44 8.52 8.59 8.67 8.75
8.83 8.91
Deflection Design
6.18 6.19 6.21 6.23 6.25
6.26 6.28 6.30 6.32 6.34
6.37 6.39 6.41 6.43 6.46
.
6.48 6.50 6.53 6.56 6.58
6.61 6.64 6.67 6.70 6 73
6.76 6.79 6.83 6.86 6.89
6.93 6.97 7.01 7.05 7.09
7.13 7.17 7.22 7.26 7.31
7.36 7.41
Of D
1
170 169 168 167 166
165 164 163 162 161
160 159 158 157 156
155 154 153 152 151
150 149 148 147 146
145 144 143 142 141
140 139 138 137 136
135 134 133 132 131
130 129
Bending Stress Design
8.99 9.07 9.16
9.25 9.33 9.42 9.51 9.60
9.70 9.79 9.89 9.99 10.09
10.19 10.29 10.40 10.51 10.62
10.73 10.84 10.96 11.08 11.21
11.33 11.46 11.59 11.73 11.87
12.01 12.16 12.31 12.46 12.62
12.79 12.96 13.13 13.31 13.49
13.68 13.88 14.08 14.30 14.51
Design
7.46 7.51 7.57
7.63 7.69 7.75 7.81 7.87
7.94 8.01 8.08 8.16 8.23
8.31 8.40 8.48 8.57 8.66
8.76 8.86 8.96 9.07 9.18
9.29 9.41 9.54 9.67 9.80
9.94 10.09 10.24 10.40 10.56
10.73 10.91 11.10 11.29 11.50
11.71 11.94 12.17 12.42 12.67
D--i t or --Dt
128 127 126
125 124 123 122 121
120 119 118 117 116
115 114 113 112 111
110 109 108 107 106
105 104 103 102 101
100 99 98 97 96
95 94 93 92 91
90 89 88 87 86
CTD000340
THICKNESS DESIGN OF DUCTILE-IRON PIPE
15
TABLE 50.8--(coni.)
Trench Load (P*)--psi
Trench Load (P#)--psi
Bending Stress Design
14.74 14.97 15.21 15.46 15.72
15.99 16.28 16.57 16.87 17.19
17.52 17.86 18.22 18.59 18.98
19.39 19.82 20.27 20.73 21.23
21.74 22.28 22.85 23.45 24.07
24.74 25.43 26.17
Deflection Design
12.94 13.22 13.52 13.83 14.16
14.50 14.86 15.24 15.64 16.06
16.51 16.98 17.48 18.00 18.56
19.14 19.77 20.43 21.13 21.87
22.67 23.51 24.41 25.37 26.39
27.49 28.66 29.91
Of D t r ti
85 84 83 82 81
80 79 78 77 76
75 74 73 72 71
70 69 68 67 66
65 64 63 62 61
60 59 58
Bending Stress Design
26.95 27.77
28.64 29.56 30.53 31.57 32.67
33.84 35.08 36.41 37.83 39.34
40.96 42.70 44.57 46.57 48.73
51.06 53.57 56.30 59.25 62.46
65.96 69.79 73.98 78.57 83.64
Deflection Design
31.26 32.71
34.26 35.93 37.74 39.69 41.80
44.09 46.56 49.26 52.19 55.40
58.89 62.73 66.93 71.56 76.66
82.29 88.54 95.48 103.21 111.85
121.54 132.44 144.74 158.68 174.54
Df D ror7,
57 56
55 54 53 52 51
50 49 48 47 46
45 44 43 42 41
40 39 38 37 36
35 34 33 32 31
* E' 300; Kb = 0.210; K = 0.105. t The ~ for the tabulated P* nearest to the calculated P. is selected; when the calculated Pis halfway between
two tabulated values, the smaller ~ should be used.
CTD000341
16 AMERICAN NATIONAL STANDARD
TABLE 50.9
Diameter-Thickness Ratios for Laying Condition Type 3*
Trench Load (P)--psi
Trench Load (P,)--pit
Bending Stress Design
3.25 3.29 3.33 3.37 3.41
3.45 3.49 3.54 3.58 3.63
3.67 3.72 3.76 3.81 3.86
3.91 3.96 4.01 4.06 4.11
4.17 4.22 4.28 4.33 4.39
4.45 4.51 4.57 4.63 4.69
4.76 4.82 4.89 4.96 5.03
5.10 5.17 5.24 5.31 5.39
5.47 5.54
Deflection Design
7.26 7.27 7.27 7.27 7.28
7.28 7.28 7.29 7.29 7.30
7.30 7.30 7.31 7.31 7.32
7.32 7.33 7.33 7.34 7.34
7.35 7.35 7.36 7.36 7.37
7.38 7.38 7.39 7.39 7.40
7.41 7.42 7.42 7.43 7.44
7.45 7.46 7.47 7.48 7.48
7.49 7.51
Of D
< or (.
310 308 306 304 302
300 298 296 294 292
290 288 286 284 282
280 278 276 274 272
270 268 266 264 262
260 258 256 254 252
250 248 246 244 242
240 238 236 234 232
230 228
Bending Stress Design
5.62 5.70 5.79
5.87 5.96 6.04 6.13 6.22
6.32 6.41 6.51 6.60 6.70
6.80 6.91 7.01 7.12 7.22
7.33 7.45 7.56 7.68 7.80
7.92 8.04 8.16 8.29 8.42
8.55 8.62 8.69 8.75 8.82
8.89 8.96 9.03 9.10 9.17
9.25 9.32 9.39 9.47 9.54
Design
7.52 7.53 7.54
7.55 7.56 7.58 7.59 7.60
7.62 7.63 7.65 7.66 7.68
7.70 7.72 7.74 7.76 7.78
7.80 7.82 7.84 7.87 7.89
7.92 7.95 7.98 8.01 8.04
8.07 8.09 8.11 8.13 8.14
8.16 8.18 8.20 8.22 8.24
8.27 8.29 8.31 8.33 8.36
'
Df D
T or 7i
226 224 222
220 218 216 214 212
210 208 206 204 202
200 198 196 194 192
190 188 186 184 182
180 178 176 174 172
170 169 168 167 166
165 164 163 162 161
160 159 158 157 156
CTD000342
THICKNESS DESIGN OF DUCTILE-IRON PIPE
TABLE S0.9--(cont.)
Trench Load (P0--psi
Trench Load (P*)--psi
Bending Stress Design
9.62 9.69 9.77 9.85 9.92
10.00 10.08 10.16 10.24 10.33
10.41 10.49 10.58 10.66 10.75
10.83 10.92 11.01 11.10 11.19
11.28 11.37 11 46 11.56 11.65
11.75 11.84 11.94 12.04 12.14
12.25 12.35 12.45 12.56 12.67
12.78 12.89 13.00 13.11 13.23
13.34 13.46 13.58
Deflection Design
8.38 8.41 8.43 8.46 8.49
8.52 8.54 8.57 8.60 864
8.67 8.70 8.73 8.77 8.81
8.84 8.88 8.92 8.96 9.00
9.04 9.09 9.13 9.18 9.23
9.28 9.33 9.38 9.44 9.49
9.55 9.61 9.67 9.74 9.80
9.87 9.94 10.02 10.09 10.17
10.25 10.34 10.42
Dt D
rorT,
155 154 153 152 151
150 149 148 147 146
145 144 143 142 141
140 139 138 137 136
135 134 133 132 131
130 129 128 127 126
125 124 123 122 121
120 119 118 117 116
115 114 113
Bending Stress Design
13.71 13.83
13.96 14.09 14.22 14.36 14.50
14.64 14.78 14.93 15.08 15.23
15.39 15.55 15.71 15.88 16.06
16.23 16.42 16.61 16.80 17.00
17.21 17.42 17.64 17.86 18.10
18.34 18.59 18.85 19.12 19.40
19.68 19.99 20.30 20.62 20.96
21.31 21.68 22.07 22.47 22.88
Deflection Design
10.51 10.61
10.71 10.81 10.91 11.02 11.13
11.25 11.37 11.50 11.63 11.77
11.91 12.06 12.21 12.37 12.54
12.72 12.90 13.09 13.29 13.50
13.72 13.95 14.18 14.43 14.70
14.97 15.26 15.56 15.88 16.21
16.56 16.93 17.31 17.72 18.15
18.61 19.09 19.59 20.13 20.69
17
Dt D
i or <i
112 111
110 109 108 107 106
105 104 103 102 101
100 99 98 97 96
95 94 93 92 91
90 89 88 87 86
85 84 83 82 81
80 79 78 77 76
75 74 73 72 71
CTD000343
18 AMERICAN NATIONAL STANDARD
TABLE 50.9--(coni.)
Trench Load (P)--psi
Trench Load (P.)--psi
Bending Stress Design
23.32 23.78 24.26 24.76 25.29
25.85 26.43 27.04 27.68 28.36
29.08 29.83 . 30.63 31.47 32.36
33.31 34.30 35.37 36.49 37.69
Deflection Design
21.29 21.93 22.60 23.32 24.08
24.88 25.74 26.66 27.64 28.68
29.80 30.99 32.27 33.64 35.12
36.70 38.41 40.25 42.24 44.39
Dt D i 0ff,
70 69 68 67 66
65 64 63 62 61
60 59 58 57 56
55 54 53 52 51
Bending Stress Design
38.97 40.33 41.78 43.33 44.98
46.76 48.66 50.71 52.91 55.28
57.84 60.61 63.61 66.86 70.40
74.27 78.49 83.11 88.19 93.79
Deflection Design
46.72 49.25 51.99 54.98 58.25
61.81 65.72 70.01 74.72 79.92
85.67 92.04 99.11 106.99 115.80
125.67 136.78 149.32 163.54 179.71
Df D TorT,
50 49 48 47 46
45 44 43 42 41
40 39 38 37 36
35 34 33 32 31
* E' - 400; K = 0.189; K, = 0.103. t The - for the tabulated P nearest to the calculated P is selected; when the calculated P. is halfway between
two tabulated values, the smaller j should be used.
A
V
)
#1
CTD000344
i
THICKNESS DESIGN OF DUCTILE-IRON PIPE
TABLE 50.10
Diameter-Thickness Ratios for Laying Condition Type 4*
Trench Load (/\)--psi
Trench Load (/%)--psi
Bending Stress Design
5.93 6.00 6.07 6.14 6.21
6.29 6.36 6.43 6.51 6.59
6.67 6.74 6.83 6.91 6.99
7.08 7.16 7.25 7.34 7.43
7.52 7.61 7.71 7.80 7.90
8.00 8.10 8.20 8.31 8.41
8.52 8.63 8.74 8.85 8.97
9.08 9.20 9.32 9.44 9.57
9.69 9.82
Deflection Design
9.70 9.70 9.71 9.71 9.71
9.72 9.72 9.73 9.73 9.73
9.74 9.74 9.75 9.75 9.76
9.76 9.77 9.77 9.78 9.78
9.79 9.79 9.80 9.81 9.81
9.82 9.83 9.83 9.84 9.85
9.86 9.86 9.87 9.88 9.89
9.90 9.91 9.92 9.93 9.94
9.95 9.96
Df D t or(,
310 308 306 304 302
300 298 296 294 292
290 288 286 284 282
280 278 276 274 272
270 268 266 264 262
260 258 256 254 252
250 248 246 244 242
240 238 236 234 232
230 228
Bending Stress Design
9.95 10.08 10.21
10.35 10.49 10.62 10.77 10.91
11.05 11.20 11.35 11.50 11.66
11.81 11.97 12.13 12.29 12.45
12.62 12.79 12.96 13.13 13.30
13.48 13.66 13.84 14.02 14.20
14.39 14.48 14.57 14.67 14.76
14.86 14.96 15.05 15.15 15.25
15.34 15.44 15.54 15.64 15.74
Deflection Design
9.97 9.98 9.99
10.01 10.02 10.03 10.05 10.06
10.08 10.09 10.11 10.13 10.15
10.17 10.19 10.21 10.23 10.25
10.27 10.30 10.32 10.35 10.37
10.40 10.43 10.46 10.50 10.53
10.57 10.59 10.60 10.62 10.64
10.66 10.69 10.71 10.73 10.75
10.78 10.80 10.82 10.85 10.87
19
Of D i orT,
226 224 222
220 218 216 214 212
210 208 206 204 202
200 198 196 194 192
190 188 186 184 182
180 178 176 174 172
170 169 168 167 166
164 163 162 161
160 159 158 157 156
CTD000345
20 AMERICAN NATIONAL STANDARD
TABLE 50.10--(coni.)
Trench Load (Pe)--psi
Trench Load (Pf)--psi
Bending Stress Design
15.84 15.94 16.04 16.14 16.24
16.34 16.45 16.55 16.65 16.76
16.86 16.96 17.07 17.18 17.28
17.39 17.50 17.60 17.71 17.82
17.93 18.04 18.15 18.26 18.37
18.49 18.60 18.72 18.83 18.95
19.06 19.18 19.30 19.42 19.54
19.66 19.78 19.91 20.04 20.16
20.29 20.42 20.55
Deflection Design
10.90 10.93 10.96 10.98 11.01
11.04 11.07
11.11
11.14 11.17
11.21 11.24 11.28 11.31 11.35
11.39 11.43 11.48 11.52 11.56
11.61 11.66 11.71 11.76 11.81
11.86 11.92 11.97 12.03 12.09
12.15 12.22 12.28 12.35 12.42
12.50 12.57 12.65 12.73 12.82
12 91 13.00 13.09
md t or ti
155 154 153 152 151
150 149 148 147 146
145 144 143 142 141
140 139 138 137 136
135 134 133 132 131
130 129 128 127 126
125 124 123 122 121
120 119 118 117 116
115 114 113
Bending Stress Design
20.69 20.82
20.96 21.10 21.24 21.39 21.54
21.69 21.84 22.00 22.16 22.32
22.49 22.66 22.83 23.01 23.20
23.38 23.58 23.78 23.99 24.20
24.42 24.64 24.88 25.12 25.37
25.63 25.90 26.18 26.47 26.77
27.09 27.42 27.76 28.11 28.49
28.87 29.28 29.70 30.15 30.62
Deflection Design
13.19 13.29
13.39 13.50 13.61 13.73 13.85
13.98 14.11 14.24 14.38 14.53
14.68 14.84 15.01 15.18 15.36
15.55 15.75 15.95 16.17 16.39
16.62 16.87 17.12 17.39 17.67
17.97 18.28 18.60 18.94 19.30
19.67 20.07 20.48 20.92 21.38
21.87 22.38 22.93 23.50 24.11
Df D t r ti
112 111
110 109 108 107 106
105 104 103 102 101
100 99 98 97 96
95 94 93 92 91
90 89 88 87 86
85 84 83 82 81
80 79 78 77 76
75 74 73 72 71
CTD000346
THICKNESS DESIGN OF DUCTILE-IRON PIPE
21
TABLE 50.10--(cont.)
Trench Load (P)--psi
Trench Load (P)--psi
Bending Stress Design
31.11 31.62 32.16 32.72 33.32
33.95 34.61 35.30 36.04 36.81
37.63 38.50 39.42 40.39 41.42
42.51 43.67 44.91 46.22 47.62
Deflection Design
24.75 25.43 26.16 26.92 27.74
28.60 29.53 30.51 31.56 32.68
33.88 35.16 36.53 38.00 39.58
41.28 43.12 45.09 47.22 49.53
m-- or --d / 11
70 69 68 67 66
65 64 63 62 61
60 59 58 57 56
55 54 53 52 51
Bending Stress Design
49.11 50.70 52.41 54.23 56.18
58.27 60.52 62.93 65.54 68.35
71.39 74.67 78.24 82.11 86.33
90.93 95.97 101.49 107.56 114.25
Deflection Design
52.03 54.74 57.69 60.90 64.40
68.23 72.42 77.02 82.08 87.66
93.82 100.65 108.24 116.70 126.15
136.74 148.66 162.12 177.37 194.72
Dt D
Trl7
50 49 48 47 46
45 44 43 42 41
40 39 38 37 36
35 34 33 32 31
E' = 500; Kb = 0.157; K, = 0.096. t The y for the tabulated P. nearest to the calculated P, is selected; when the calculated P. is halfway between
two tabulated values, the smaller -- should be used.
CTD000347
22 AMERICAN NATIONAL STANDARD
TABLE 50.11
Diameter-Thickness Ratios for Laying Condition Type 5*
Trench Load (P.)--psi
Trench Load (P.)--psi
Bending Stress Design
3.06 3.10 3.15 3.20 3.25
3.30 3.35 3.40 3.46 3.51
3.57 3.63 3.68 3.75 3.81
3.87 3.94 4.00 4.07 4.14
4.21 4.29 4.36 4.44 4.52
4.60 4.69 4.77 4.86 4.95
5.05 5.14 5.24 5.35 5.45
5.56 5.67 5.78 5.90 6.02
6.15 6.28
Deflection Design
15.09 15.09 15.09 15.09 15.09
Df D 1 r <i
660 655 650 645 640
15.09 15.09 15.09 15.09 15.09
635 630 625 620 615
15.10 15.10 15.10 15.10 15.10
15.10 15.10 15.10 15.10 15.10
610 605 600 595 590
585 580 575 570 ; 565
15.10 15.10 15.10 15.11 15.11
15.11
15.11 15.11 15.11 15.11
15.11 15.11 15.12 15.12 15.12
560 555 550 545 540
! 535 530
i 525 520 515
510 505 500 495 490
15.12 15.12 15.12 15.13 15.13
485 480 475 470 465
15.13 15.13
460 455
Bending Stress Design
6.41 6.54 6.68
6.83 6.98 7.13 7.29 7.46
7.63 7.80 7.98 8.17 8.36
8.56 8.77 8.98 9.20 9.43
9.66 9.91 10.16 10.42 10.69
10.97 11.26 11.56 11.87 12.19
12.52 12.66 12.80 12.94 13.08
13.23 13.37 13.52 13.67 13.83
13.98 14.14 14.30 14.46 14.62
Deflection Design
15.13 15.14 15.14
15.14 15.14 15.14 15.15 15.15
15.15 15.16 15.16 15.16 15.17
15.17 15.17 15.18 15.18 15.19
15.19 15.20 15.20 15.21 15.22
15.22 15.23 15.24 15.24 15.25
15.26 15.27 15.27 15.27 15.28
15.28 15.29 15.29 15.30 15.30
15.30 15.31 15.31 15.32 15.33
O--t f or --1D1
450 445 440
435 430 425 420 415
410 405 400 395 390
385 380 375 370 365
360 355 350 345 340
335 330 325 320 315
310 308 306 304 302
300 298 296 294 292
! 290
! 288 ! 286
284 282
CTD000348
THICKNESS DESIGN OF DUCTILE-IRON PIPE
TABLE 50.11--(cont.)
Trench Load (P.)--psi
Trench Load (P.)--psi
Bending Stress Design
14.79 14.96 15.13 15.30 15.48
15.65 15.83 16.02 16.20 16.39
16.58 16.77 16.97 17.16 17.36
17.57 17.77 17.98 18.19 18.40
18.62 18.84 19.06 19.28 19.51
19.73 19.97 20.20 20.43 20.67
20.91 21.16 21.40 21.65 21.90
22.15 22.40 22.66 22.92 23.18
23.44 23.70 23.97
Deflection Design
15.33 15.34 15.34 15.35 15.35
15.36 15.37 15.37 15.38 15.39
15.40 15.40 15.41 15.42 15.43
15.44 15.45 15.45 15.46 15.47
15.48 15.49 15.51 15.52 15.53
15.54 15.55 15.57 15.58 15.59
15.61 15.62 15.64 15.65 15.67
15.69 15.71 15.73 15.75 15.77
15.79 15.81 15.83
D t f t\
280 278 276 274 272
270 268 266 264 262
260 258 256 254 252
250 248 246 244 242
240 238 236 234 232
230 228 226 224 222
220 218 216 214 212
210 208 206 204 202
200 198 196
Bending Stress Design
24.24 24.50
24.77 25.04 25.31 25.59 25.86
26.13 26.41 26.68 26.96 27.23
27.51 27.65 27.78 27.92 28.06
28.19 28.33 28.47 28.60 28.74
28.87 29.01 29.15 29.28 29.41
29.55 29.68 29.82 29.95 30.08
30.21 30.34 30.48 30.61 30.74
30.87 30.99 31.12 31.25 31.38
Deflection Design
15.86 15.88
15.91 15.93 15.96 15.99 16.02
16.06 16.09 16.12 16.16 16.20
16.24 16.26 16.28 16.31 16.33
16.35 16.37 16.40 16.42 16.45
16.48 16.50 16.53 16.56 16.59
16.62 16.65 16.68 16.71 16.74
16.78 16.81 16.85 16.89 16.92
16.96 17.00 17.04 17.09 17.13
23
Df D
194 192
190 188 186 184 182
180 178 176 174 172
170 169 168 167 166
165 164 163 162 161
160 159 158 157 156
155 154 153 152 151
150 149 148 147 146
145 144 143 142 141
CfOOOO^49
24 AMERICAN NATIONAL STANDARD
TABLE 50.11--(cont.)
r
Trench Load (P)--Psi
Bending Stress Design
31.50 31.63 31.76 31.88 32.01
32.13 32.25 32.38 32.50 32.62
32.75 32.87 32.99 33.11 33.23
33.35 33.47 33.59 33.71 33.83
33.95 34.07 34.19 34.31 34.43
34.55 34.68 34.80 34.92 35.05
35.17 35.30 35.43 35.56 35.69
35.83 35.96 36.10 36.25 36.39
36.54 36.69 36.85
Deflection Design
17.17 17.22 17.27 17.32 17.37
17.42 17.47 17.53 17.58 17.64
17.70 17.76 17.83 17.89 17.96
18.03 18.11 18.18 18.26 18.34
18.42 18.51 18.60 18.69 18.78
18.88 18.98 19.09 19.20 19.31
19.43 19.55 19.68 19.81 19.95
20.09 20.24 20.39 20.55 20.72
20.89 21.07 21.26
Dt D -- or -- l t\
140 139 138 137 136
135 134 133 132 131
130 129 128 127 126
125 124 123 122 121
120 119 118 117 116
115 114 113 112 111
110 109 108 107 106
105 104 103 102 101
100 99 98
Trench Load (P.)--psi
Bending Stress Design
37.01 37.17
Deflection Design
21.45 21.66
t
Dt D
T or T,
97 96
37.34 37.52 37.70 37.89 38.08
21.87 22.09 22.32 22.56 22.82
95 94 93 92 91
38.28 38.49 38.71 38.93 39.17
23.08 23.36 23.65 23.95 24.27
90 89 88 87 86
39.41 39.67 39.94 40.22 40.51
24.60 24.95 25.31 25.70 26.10
85 84 83 82 81
40.82 41.14 41.48 41.84 42.21
26.52 26.97 27.44 27.93 28.46
80 79 78 77 76
42.60 43.02 43.45 43.92 44.40
29.01 29.59 30.20 30.85 31.53
75
t74
73 72 71
44.91 45.46 46.03 46.64 47.28
32.26 33.03 33.85 34.71 35.63
70 69 68 67 66
47.96 48.68 49.44 50.25 51.11
52.02 52.99 54.02 55.12 56.28
36.61 37.65 38.77 39.95 41.21
65 64 63 62 61
42.57
| 60
44.01
: 59
I
45.56
: 53
47.23
57
49.01
56
CTD000350
THICKNESS DESIGN OF DUCTILE-IRON PIPE
25
TABLE 50.11--(coni.)
Trench Load (P.)--psi
Trench Load (P.)--psi
Bending Stress Design
57.53 58.86 60.28 61.79 63.41
65.14 67.00 68.99 71.12 73.41
75.88 .78.54 81.40
Deflection Design
50.93 53.00 55.23 57.64 60.25
63.07 66.13 69.46 73.09 77.04
81.36 86.10 91.29
O--f or --D t 11
55 5-4 53 52 51
50 49 48 47 46
45 44 43
Bending Stress Design
84.50 87.85
91.47 95.40 99.67 104.32 109.40
114.94 121.02 127.69 135.03 143.14
Deflection Design
97.01 103.31
110.27 117.98 126.56 136.11 146.78
158.75 172.21 187.41 204.63 224.22
D\ D
T or 71
42 41
40 39 38 37 36
35 34 33 32 31
* ' = 700; Kk - 0.128; K, = 0.08S. t The j for the tabulated P* nearest to the calculated P* is selected; when the calculated P* is halfway between two tabulated values, the smaller ^ should be used.
CTD000351
26 AMERICAN NATIONAL STANDARD
TABLE 50.12
Thickness for Earth Load Plus Truck Load
Laving Condition
Depth
Type 1
Type 2
Type 3
Type 4
Type
Size of
in. Cover
ft Total
Total
Total
Total
Total
Calculated Use Calculated
Calculated Use Calculated Use Calculated Use
Thickness* Class Thickness* Class Thickness* Class Thickness'' Class Thickness* Class
m. in. (a. lit. in.
3
2.5 0.18 5 L
0.17
51
0.16
51
0.15
51
0.14
51
3
0.17
51
0.16
51
0.16
51
0.15
51
0.14
51
4
0.17
51
0.16
51
0.15
51
0.14
51
0.14
51
5
0.16
51
0.16
51
0.15
51
0.14
51
0.14
51
6
0.16
51
0.16
51
0.15
51
0.14
51
0.14
51
7
0.16
51
0.16
51
0.15
51
0.14
51
0.14
51
8
0.17
51
0.16
51
0.15
51
0.15
51
0.14
51
9
0.17
51
0.16
51
0.15
51
0.15
51
0.14
51
10
0.17
51
0.16
51
0.15
51
0.15
51
0.14
51
12
0.17
51
0.17
51
0.16
51
0.15
51
0.14
51
14
0.18
51
0.17
51
0.16
51
0.15
51
0.14
51
16
0.18
51
0.17
51
0.17
51
0.15
51
0.14
51
20
0.19
51
0.18
51
0.17
51
0.16
51
0.15
51
24
0.19
51
0.19
51
0.18
51
0.16
51
0.15
51
28
0.20
51
0.19
51
0.19
51
0.17
51
0.15
51
32
0.21
51
0.20
51
0.19
51
0.18
51
0.15
51
4
2.5 0.19
51
0.18
51
0.17
51
0.15
51
0.15
I! D3
0.18
51
0.17
51
0.16
51
0.15
51
0.14
4 0.17 51 0.16 51 0.16 51 0.15 51 0.14 !.
5
0.17
51
0.16
51
0.15
51
0.15
51
0.14
6
0.17
51
0.16
51
0.15
51
0.15
51
0.14
7 0.17 51 0.16 51 0.16 51 0.15 51 0.14
8
0.17
51
0.16
51
0.16
51
0.15
51
0.14
9
0.18
51
0.17
51
0.16
51
0.15
51
0.14
10
0.18
51
0.17
51
0.16
51
0.15
51
0.14
12
0.18
51
0.17
51
0.16
51
0.15
51
0.14
14
0.19
51
0.18
51
0.17
51
0.15
51
0.15
16
0.19
51
0.18
51
0.17
51
0.16
51
0.15
51
20
0.20
51
0.19
51
0.18
51
0.16
51
0.15
51
24 0.21 51 0.20 51 0.19 51 0.17 51 0.15 51
28
0.22
51
0.21
51
0.20
51
0.18
51
0.15
51
32
0.22
51
0.21
51
0.21
51
0.19
51
0.16
51
6 2.5 0.21 50 0.20 50 0.18 50 0.16 50 0.15 50
3 0.20 50 0.19 50 0.18 50 0.16 50 0.15 50
4 0.19 50 0.18 50 0.17 50 0.16 50 0.15 50
5 0.19 50 0.17 50 0.17 50 0.15 50 0 15 50
6 0.19 50 0.17 50 0.17 50 0.15 50 0.15 50
7 0.19 50 0.18 50 0.17 50 0.16 50 0.15 50
8 0 19 50 0.18 50 0.17 50 0.16 50 0.15 50
9 0.20 50 0.18 50 0.17 50 0.16 50 0.15 50
10
0.20
50
0.18
50
0.17
50 0.16
50
0.15
50
12 0.21 50 0.19 50 0.18 50 0.16 50 0.15 50
14 0.21 50 0.20 50 0.18 50 0.17 50 0.15 50
16 0.22 50 0.21 50 0.19 50 0.17 50 0.15 50
20 0 23 50 0.22 50 0 21 50 0 18 50 0 16
24 0.24 50 0.23 50 0.22 50 0.19 50 0.16 50 w
28 0.25 50 0.24 50 0.23 50 0.20 50 0.16 50
32 0.26 50 0.25 50 0.24 50 0.22 50 0.17 50
* Total calculated thickness includes service allowance and casting tolerance added to net thickness.
k
THICKNESS DESIGN OF DUCTILE-IRON PIPE
TABLE 50.12--(coni.)
27
Laying Condition
Depth of
Cover ft
Type l
Total Calculated Use Thickness* Class
in.
Type 2
Type 3
Total Calculated Use Thickness* Class
in.
Total Calculated Use Thickness* Class
*H.
Type 4
Total Calculated
1 1
Use
Thickness* Class
in.
Type S
Use 1 Thickness* Class]
in.
2.5 0.24 50 0.22 50 0.20 50 0.18 50 0.16 50
3 0.23 50 0.21 50 0.19 50 0.17 50 0.16 50
4
0.21
50
0.19
50
0.18
50
0.16
50
0.15
50
5 0.21 50 0.19 50 0.18 50 0.16 50 0.15 50
6 0.21 50 0.19 50 0.18 50 0.16 50 0.15 50
7 0.21 50 0.19 50 0.18 50 0.16 50 0.15 5C
8
0.21
50
0.19
50
0.18
50
0.16
50
0.15
50
9 0.22 50 0.20 50 0.18 50 0.17 50 0.15 50
10 0.22 50 0.20 50 0.19 50 0.17 50 0.15 50
12
0.23
50
0.21
50
0.19
50
0.17
50
0.16
50
14 0.24 50 0.22 50 0.20 50 0.18 50 0.16 50
.16 0.25 50 0.23 50 0.21 50 0.18 50 0.16 50
20 0.27 50 0.25 50 0.23 50 0.19 50 0.17 50
24 0.28 50 0.26 50 0.24 50 0.21 50 0.17 50
28 0.29 51 0.28 50 0.26 50 0.23 50 0.18 50
32
0.30
51
0.29
51
0.27
50
0.24
50
0.18
50
2.5 0.27 50 0.25 50 0.23 50 0.20 50 0.17 50
3
0.26
50
0.23
50
0.21
50
0.19
50
0.17
50
4 0.24 50 0.22 50 0.20 50 0.18 50 0.17 50
5 0.23 50 0.21 50 0.20 50 0.18 50 0.17 50
6 0.23 50 0.21 50 0.20 50 0.18 50 0.17 50
7 0.24 50 0.21 50 0.20 50 0.18 50 0.17 50
8 0.24 50 0.22 50 0.20 50 0.18 50 0.17 50
9 0.25 50 0.22 50 0.20 50 0.18 50 0.17 50
10 0.25 50 0.23 50 0.21 50 0.19 50 0.17 50
12 0.26 50 0.24 50 0.22 50 0.19 50 0.17 50
14 0.28 50 0.25 50 0.23 50 0.20 50 0.18 50
16 0.29 50 0.26 50 0.24 50 0.20 50 0.18 50
20 0.31 51 0.28 50 0.26 50 0.22 50 0.18 50
24 0.32 51 0.30 50 0.28 50 0.24 50 0.19 50
28 0.34 52 0.32 51 0.30 50 0.26 50 0.20 50
32 0.35 52 0.33 51 0.32 51 0.28 50 0.20 50
2.5 0.30 50 0.27 50 0.24 50 0.21 50 0.18 50
3 0.28 50 0.25 50 0.23 50 0.20 50 0.18 50
4 0.26 50 0.23 50 0.21 50 0.19 50 0.17 50
5 0.25 50 0.23 50 0.21 50 0.19 50 0.17 50
6 0.25 50 0.23 50 0.21 50 0.19 50 0.17 50
7 0.26 50 0.23 50 0.21 50 0.19 50 0.17 50
8 0.26 50 0.25 50 0.21 50 0.19 50 0.17 50
9 0.27 50 0.24 50 0.2 2 50 0.19 50 0.17 50
10 0.27 50 0.24 50 0.22 50 0.20 50 0.18 50
12 0.29 50 0.26 50 0.23 50 0.20 50 0.18 50
14 0.30 50 0.27 50 0.24 50 0.21 50 0.18 50
16
0.31
50
0.29
50 0.26
50
0.21
50
0.18
50
20
0.34
51
0.31
50 0.28 50 0.23 50 0.19 50
24 0.36 52 0.33 51 0.31 50 0.25 50 0.20 50
28
0.38
52
0.35
51
0.33
51
0.28
50
0.21
50
32
0.39
53
0.37
52
0.35
51
0.30
50
0.23
50
* Total calculated thickness includes service allowance and casting tolerance added to net thickness.
CTD000353
28 AMERICAN NATIONAL STANDARD
TABLE 50.12--(cont.)
Size tn.
Laying Condition
Depth of
Cover ft
Type I
Total Calculated L'se Thickness* Class
in.
Type 2
Total Calculated LTse Thickness* Class
in.
Type 3
Total Calculated Use Thickness* Class
in.
Type 4
Total Calculated Use Thickness* Class
in.
Type 5
Total Calculated Use Thickness* Class
in.
f
14 2.5 0.32 50 0.29 50 0.26 50 0.22 50 0.20 50
3 0.31 50 0.27 50 0.24 50 0.21 50 0.19 50
4
0.29
50
0.26
50
0.23
50
0.21
50
0.19
50
5 0.28 50 0.25 50 0.23 50 0.20 50 0.19 50
6 0.28 50 0.25 50 0.23 50 0.20 50 0.19 50
7 0.28 50 0.25 50 0.23 50 0.21 50 0.19 50
8 0.29 50 0.26 50 0.23 50 0.21 50 0.19 50
9 0.30 50 0.26 50 0.24 50 0.21 50 0.19 50
10 0.31 50 0.27 50 0.24 50 0.21 50 0.19 50
12 0.32 50 0.29 50 0.26 50 0.22 50 0.19 50
14 0.34 50 0.30 50 0.27 50 0.23 50 0.20 50
16
0.35
51
0.32
50
0.29
50
0.24
50
0.20
50
20
0.38
52
0.35
51
0.32 50 0.26 50
0.21
50
24 0.40 52 0.38 52 0.34 50 0.28 50 0.22 50
28 0.42 53 0.40 52 0.37 51 0.31 50 0.24 50
32 0.44 54 0.42 53 0.39 52 0.34 50 0.26 50
16 2.5 0.34 50 0.30 50 0.27 50 0.23 50 0.20 50
3 0.32 50 0.28 50 0.25 50 0.22 50 0.20 50
4 0.30 50 0.27 50 0.24 50 0.21 50 0.19 50
5 0.30 50 0.26 50 0.24 50 0.21 50 0.19 50
6 0.30 50 0.26 50 0.24 50 0.21 50 0.19 50
7 0.30 50 0.26 50 0.24 50 0.21 50 0.19 50
8 0.31 50 0.27 50 0.25 50 0.22 50 0.19 50
9 0.32 50 0.28 50 0.25 50 0.22 50 0.20 50
10 0.33 50 0.29 50 0.26 50 0.22 50 0.20 50
12 0.35 50 0.31 50 0.27 50 0.23 50 0.20 50
14 0.36 51 0.33 50 0.29 50 0.24 50 0.20 50
16 0.38 51 0.34 50 0.30 50 0.25 50 0.21 50
20 0.41 52 0.38 51 0.34 50 0.27 50 0.22 50
24 0.44 53 0.41 52 0.37 51 0.30 50 0.24 50
28 0.46 54 0.43 53 0.40 52 0.33 50 0.27 so
32
0.48
55
0.46
54
0.43
53
0.36
51
0.29
50
18 2.5 0.36 50 0.32 50 0.28 50 0.24 50 0.20 50
3 0.34 50 0.29 50 0.26 50 0.23 50 0.20 50
4 0.32 50 0.28 SO 0.25 50 0.22 50 0.20 50
5 0.31 50 0.27 50 0.25 50 0.22 50 0.19 50
6 0.31 50 0.27 50 0.25 50 0.22 50 0.19 50
7 0.32 so 0.28 50 0.25 50 0.22 50 0.20 50
8 0.33 50 0.29 50 0.26 50 0.22 50 0.20 50
9 0.34 50 0.30 50 0.26 50 0.23 50 0.20 50
10 0.35 50 0.30 50 0.27 50 0.23 50 0.20 50
12 0.37 51 0.32 50 0.29 50 0.24 50 0.21 50
14 0.39 51 0.35 50 0.30 50 0.25 50 0.21 50
16
0.41
52
0.37
51
0.32
50
0.26
50
0.22
50
20 0.44 53 0.40 52 0.36 50 0.29 50 0.23 50
24 0.47 54 0.44 53 0.40 52 0.32 50 0.26 50
28 0.50 55 0.46 54 0.43 53 0.36 50 0.29 50
32
0.53
56
0.49
55
0.46
54
0.39
51
0.32
50
* Total calculated thickness includes service allowance and casting tolerance added to net thickness.
1 J.CTD000354
THICKNESS DESIGN OF DUCTILE-IRON PIPE
TABLE 50.12--(cont.)
29
Laying Condition
Depth of
Cover
ft
Type 1
Total Calculated Use Thickness* Class
in.
Type 2
Total Calculated Use Thickness* Class
in.
Type 3
Total Calculated Use Thickness* Class
in.
Type 4
Total Ca Iculated Use Thickness* Class
in.
Type 5
Total Calculated Lrse Thickness* Class
in.
2.5
0.38
51
0.33
50
0.29
50 0.24
50
0.21
50
3 0.35 50 0.31 50 0.27 50 0.23 50 0.20 50
4 0.34 50 0.29 50 0.26 50 0.23 50 0.20 50
5 0.33 50 0.28 50 0.26 50 0.23 50 0.20 50
6 0.33 50 0.29 50 0.26 50 0.23 50 0.20 50
7 0.34 50 0.29 50 0.26 50 0.23 50 0.20 50
8 0.35 50 0.30 50 0.27 50 0.23 50 0.20 50
9 0.36 50 0.31 50 0.28 50 0.24 50 0.21 50
10 0.37 50 0.32 50 0.28 50 0.24 50 0.21 50
12 0.39 51 0.34 50 0.30 50 0.25 50 0.21 50
14 0.41 52 0.37 50 0.32 50 0.26 50 0.22 50
16
0.43
52
0.39
51
0.34
50 0.27 50 0.22
50
20 0.47 54 0.43 52 0.39 51 0.31 50 0.23 50
24 0.50 55 0.47 54 0.42 52 0.34 50 0.28 50
28
0.54
56
0.50
55
0.46
53
0.38
51
0.31
50
32 0.57 -- 0.53 56 0.49 54 0.42 52 0.34 50
2.5 0.42 51 0.35 50 0.31 50 0.26 50 0.22 50
3 0.39 so 0.33 50 0.29 50 0.25 50 0.21 50
4 0.37 50 0.31 50 0.28 50 0.24 50 0.21 50
5 0.36 50 0.31 50 0.28 50 0.24 50 0.21 50
6 0.36 50 0.31 50 0.28 50 0.24 50 0.21 50
7 0.37 50 0.32 50 0.28 50 0.24 50 0.21 50
8 0.39 50 0.33 50 0.29 50 0.25 50 0.21 50
9 0.40 51 0.34 50 0.30 50 0.25 50 0.22 50
10 0.41 51 0.35 50 0.31 50 0.26 50 0.22 50
12 0.44 52 0.38 50 0.33 50 0.27 50 0.23 50
14 0.46 53 0.41 51 0.35 50 0.28 50 0.23 50
16 0.49 54 0.44 52 0.38 50 0.31 50 0.24 50
20 0.54 55 0.49 54 0.43 52 0.36 50 0.25 50
24
0.57
56
0.53
55
0.48
53
0.40
51
0.32
50
28 0.61 -- 0.57 56 0.52 55 0.43 52 0.36 50
32 0.65 -- 0.60 -- 0.56 56 0.47 53 0.40 51
2.5 t 3 4
5 6 7 8 9 10 12 14 16 20 24 28 32
t 0.40 50 0.34 50 0.28 50 0.23 50 0.37 50 0.32 50 0.27 50 0.23 50 0.35 50 0.31 50 0.26 50 0.22 50
0.35 50 0.31 so 0.26 50 0.22 50
0.35 50 0.31 50 0.26 50 0.22 50 0.36 50 0.31 50 0.26 50 0.23 50 0.37 50 0.33 50 0.27 50 0.23 50 0.39 50 0.34 50 0.28 50 0.23 50 0.40 50 0.35 50 0.28 50 0.24 50 0.44 51 0.37 50 0.30 50 0.24 50 0.47 52 0.40 50 0.32 50 0.25 50 0.51 53 0.43 51 0.37 50 0.26 50 0.57 55 0.50 53 0.43 51 0.29 50 0.62 56 0.56 54 0.48 52 0.37 50
0.67 -- 0.61 56 0.51 53 0.43 51
0.71 0.66 -- 0.55 54 0.47 52
* Total calculated thickness includes service allowance and casting tolerance added to net thickness, t For pipe 30 in. and larger, consideration should be given to laying conditions other than Type 1.
CTD000355
30 AMERICAN NATIONAL STANDARD
TABLE 50.12--(cont.)
Laying Condition
Depth
of Cover
ft
Type 1
Total Calculated Use Thickness* Class
in.
Type 2
Total Calculated Use Thickness* Class
in.
Type J
Total Calculated Use Thickness* Class
in.
Type 4
Total Calculated Use Thickness* Class
in.
Type 5
Total Calculated Use Thickness* Class
in.
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
2.5 3 4 5 6 7 8 9 10 12 14 16 20 24 28 32
2.5 3 4 5
6
7 8
9
10 12 14 16 20 24 28 32
t t t
t 0.43 50 0.37 50 0.30 50 0.25 50
0.40 50 0.35 50 0.29 50 0.24 50
0.39 50 0.34 50 0.28 50 0.24 50
0.38 50 0.34 50 0.28 50 0.24 50
0.39 50 0.34 50 0.28 50 0.24 50
0.40 50 0.35 50 0.29 50 0.24 50
0.42 50 0.36 50 0.30 50 0.24 50
0.43 50 0.37 50 0.30 50 0.25 50
0.45 50 0.38 50 0.31 50 0.25 50
0.49
51
0.42
50
0.33
50
0.26
50
0.54 52 0.46 51 0.37 50 0.27 50'
0.58
53
0.49
51
0.42
50
0.28
50
0.65
54 0.57
53
0.50
51
0.33
50
0.71 56 0.63 54 0.55 52 0.43 50
0.77 -- 0.70 55 0.60 53 0.50 51
0.82 -- 0.76 -- 0.64 54 0.55 52
t 0.46 50 0.40 50 0.32 50 0.26 50 0.44 50 0.38 50 0.31 50 0.25 50
0.42 50 0.37 50 0.30 50 0.25 50
0.42 50 0.37 50 0.30 50 0.25 50
0.42
50
0.37
50
0.30
50
0.25
50
0.44 50 0.38 50 0.31 50 0.25 50
0.46 50 0.39 50 0.32 50 0.26 50
0.48 50 0.41 50 0.33 50 0.26 50
0.50 51 0.42 so 0.33 50 0.27 50
0.55 51 0.47 50 0.35 50 0.28 50
0.60 52 0.52 51 0.42 50 0.29 50
0.64 53 0.56 52 0.48 50 0.30 50
0.73 54 0.64 53 0.57 52 0.37 50
0.80 56 0.71 54 0.63 53 0.49 50
0.87 -- 0.79 55 0.69 54 0.57 52
0.93 -- 0.86 -- 0.73 54 0.63 53
t 0.50 50 0.43 50 0.35 50 0.28 50 0.48 50 0.42 50 0.34 50 0.28 50
0.46 50 0.40 50 0.33 50 0.27 50
0.46 50 0.40 50 0.33 50 0.27 50
0.47 50 0.41 50 0.33 50 0.27 50
0.48 50 0.42 50 0.34 50 0.28 50
0.51 50 0.44 50 0.35 50 0.28 50
0.53 50 0.45 50 0.36 50 0.29 50
0.56 51 0.47 50 0.37 50 0.30 50
0.61 51 0.53 50 0.39 50 0.31 50
0.67 52 0.59 51 0.48 50 0.32 50
0.72
53
0.64
52
0.55
51
0.33
50
0.82 54 0.72 53 0.65 i 52 0.43 50
0.91 56 0.80 54 0.72 53 0.56 51
0.98 -- 0.89 55 0.79 54 0.65 52
1.05 -- 0.97 -- 0.84 55 0.72 53
* Total calculated thickness includes service allowance and casting tolerance added to net thickness, t For pipe 3U in. and larger, consideration should be given to laying conditions other than Type 1.
CTD000356
THICKNESS DESIGN OF DUCTILE-IRON PIPE
31
TABLE 50.12--(cont.)
Laying Condition
Size in.
Depth of
Cover
ft
Type l
Total Calculated Use Thickness* Class
in.
Type 2
Total Calculated Use Thickness* Class
in.
Type 3
Type 4
Type S
Total
Calculated Use Thickness* Class
.
Total
Calculated Use Thickness* Class
iff.
Total
Calculated Use Thickness* Class
in.
54 2.5 3 4 5 6 7
8 9 10 12 14 16 20 24 28 32
t
t 0.54 50 0.46 50 0.37 50 0.30 50
0.52 50 0.45 50 0.37 50 0.30 50
0.51 50 0.44 50 0.36 50 0.30 50
0.51
50
0.44
50
0.36
50
0.30
50
0.52 50 0.45 50 0.37 50 0.30 50
0.53 50 0.46 50 0.37 50 0.30 50
0.56
50
0.48
50
0.38
50
0.31
50
0.59 50 0.50 50 0.39 50 0.32 50
0.62 51 0.52 50 o:4i ` 50 0.32 50
0.68
51
0.60
50
0.43
50
0.34
50
0.74 52 0.67 51 0.54 50 0.35 50
0.80
53
0.72
52
0.62
51
0.36
50
0.91 54 0.81 53 0.73 52 0.48 50
1.01 56 0.89 54 0.81 53 0.63 51
1.09 -- 0.99 55 0.88 54 0.73 52
1.17
--
1.08
--
0.94
55
0.81
53
* Total calculated thickness includes service allowance and casting tolerance added to net thiekness. t For pipe 30 in. and larger, consideration should be given to laying condit ons other than Type 1.
TABLE 50.13
Thickness for Internal Pressure
Rated Water Working; Pressure*--pti ...-vr
Pipe
Size in.
150 200 250 300 350
Total Calculated Thickness
in.t
Use Class
Total Calculated Thickness
in.t
Use Class
Total Calculated Thickness
n.t
Use Class
Total Calculated Thickness
n.t
Use Class
Total Calculated Thickness
in.t
Use Class
3
0.15
51
0.16
51
0.16
51 - 0.17- 51
0.17
51
4
0.16
51
0.16
51
0.17
51
0.18
51
0.18
51
6
0.17
50
0.18
50
0.19
50
0.20
50
0.20
50
8
0.18
50
0.19
50
0.21
50
0.22
50
0.23
50
10 0.21 50 0.22 50 0.23 so 0.25 50 0.26 50
12 0.22 50 0.23 50 0.25 50 0.27 50 0.28 50
14 0.24 50 0.26 50 0.28 50 0.30 50 0.31 50
16 0.25 50 0.27 50 0.30 50 0.32 50 0.34 50
18 0.27 50 0.29 50 0.31 50 0.34 50 0.36 50
20 0.28 50 0.30 50 0.33 50 0.36 50 0.38 51
24
0.30
50
0.33
50
0.37
50
0.40
51
0.43
52
30
0.34 50 0.38 50
0.42
51
0.45
52
0.49
53
36
0.38
50
0.42
50
0.47
51
0.51
[52
0.56
53
42 0.41 50 0.47 50 0.52 51 0.57 i,52 0.63 55
48
0.46
50
0.52
50
0.58
51
0.64
52
0.70
53
54 0.51 50 0.58 50 0.65 51 [0.71 .52 0.78 53
* These pipe are adequate for the rated working pressure plus a surge allowance of 100 psi. f Total calculated thickness includes service allowance and casting tolerance added to net thickness.
CTD000357
32 AMERICAN NATIONAL STANDARD
TABLE 50.14
Rated, Working Pressure and Maximum Depth of Cover
Pipe Size in.
Thickness Class
Nominal Thickness
in.
Rated Water Working Pressure
psi*
Type 1
Laying Condition
Type 2
Type 3
Type 4
Maximum Depth of Cover--ftf
Type S
3 51
0.25
350
98
loot
loot
loot
loot
52 0.28
350
loot
loot
loot
loot
loot
53 0.31
350
loot
loot
loot
loot
loot
54 0.34
350
toot
loot
loot
loot
loot
55 0.37
350 loot loot loot loot loot
56 0.40 350 loot loot loot loot loot
4 51
0.26
350
76
86
96
loot
loot
52 0.29
350
loot
loot
loot
loot
loot
53 0.32
350
loot
loot
loot
loot
loot '
54 0.35
350
loot
loot
loot
loot
loot
55 0.38
350
loot
loot
loot
loot
loot
56 0.41 350 loot loot loot loot loot
6 50
0.25
350
32 38 44 56 75
51 0.28
350
49 57 64 80 loot
52 0.31
350
67
77
86
loot
loot
53 0.34
350
91 loot loot loot loot
)54 0.37 350 loot loot loot loot loot
55 0.40 350 loot loot loot loot loot
56 0.43
350
loot
loot
loot
loot
loot
8 50
0.27
350
25 30 36 46 64
51 0.30
350
36 42 49 61 81
52 0.33
350
47 54 62 77 99
53 0.36
350
64
73
82
loot
loot
54 0.39
350
80
91
loot
loot
loot
55 0.42
350
98 loot loot loot loot
56 0.45
350
loot
loot
toot
loot
loot
10 50 51 52 53 54 55 56
12 50 51 52 53 54 55 56
0.29 0.32 0.35 0.38 0.41 0.44 0.47
0.31 0.34 0.37 0.40 0.43 0.46 0.49
350 350 350 350 350 350 350
350 350 350 350 350 350 350
19 24 29 38 55
27 32 38 49 66
35 41 47 59 79
45 52 59 74 95
57 65 74 91 loot
67
77
86
loot
loot
81
92
loot
loot
loot
17 22 27 36 52
23 28 33 43 60
30 35 41 53 71
36 42 49 61 81
45 52 59 74 95
54 62 71 87 loot
64
73
83
loot
loot
* These pipe are adequate for the rated working pressure plus a surge allowance of 100 psi. Duct:le-i: on pipe for working pressures higher than 350 psi is available.
f An allowance for a single H-20 truck with 1.5 impact factor is included for all depths of cover. Calculated maximum depth of cover exceeds 100 ft.
CTD000358
THICKNESS DESIGN OF DUCTILE-IRON PIPE
33
TABLE 50.14--(cont.)
Pipe Size n.
Thickness Class
Nominal Thickness
in.
Rated Water Working Pressure
psi*
Type l
Laying Condition
Type 2
Type 3
Type 4
Maximum Depth of Cover--jii
Type S
14 so 51 52 53 54 55 56
16 50 51 52 53 54 55 56
18 50 51 52 53 54 55 56
20 50 51 52 53 54 55 56
24 50 51 52 53 54 55 56
30 50 51 52 53 54 55 56
0.33 0.36 0.39 0.42 0.45 0.48 0.51
0.34 0.37 0.40 0.43 0.46 0.49 0.52
0.35 0.38 0.41 0.44 0.47 0.50 0.53
0.36 0.39 0.42 0.45 0.48 0.51 0.54
0.38 0.41 0.44 0.47 0.50 0.53 0.56
0.39 0.43 0.47 0.51 0.55 0.59 0.63
350 350 350 350 350 350 350
350 350 350 350 350 350 350
350 350 350 350 350 350 350
300 350 350 350 350 350 350
250 300 350 350 350 350 350
200 250 300 350 350 350 350
15 19 24 33 49
19 23 28 38 55
24 29 34 44 62
30 35 41
53 71
36 42 49 61 81
43 50 57 71 92
52 59 67
83 loot
13 17 21 30 47 16 21 25 34 51 20 25 30 40 57 25 30 36 46 64 30 35 41 53 71 35 41 47 59 79 41 48 55 68 89
11 15 20 29 42 14 19 23 32 49 18 22 27 36 53 22 26 31 41 58 25 30 36 46 64 30 35 41 53 71 35 41 47 59 79
10 14 18 27 38 13 17 21 30 44 16 20 25 34 50 19 23 28 38 54 22 27 32 42 59 26 31 37 47 65 30 35 41 53 71
8 12 17 23 31 10 15 19 27 36 13 17 21 30 41 15 19 24 33 47 18 22 27 36 53 20 25 30 40 57 24 29 34 44 61
10 14 18 25 12 16 21 29 14 19 24 33 17 21 29 38 19 24 33 44 22 27 36 51 26 31 41 57
* These pipe are adequate for the rated working pressure plus a surge allowance of 100 psi. Ductile-iron pipe or working pressures higher than 350 psi is available,
f An allowance for a single H-20 truck with 1.5 impact factor is included for all depths of cover. t Calculated maximum depth of cover exceeds 100 ft. For pipe 30 in. and larger, consideration should be given to laying conditions other than Type 1.
CTD000359
9
34 AMERICAN NATIONAL STANDARD
TABLE 50.14--(cont.)
Pipe Size in.
Thickness Class
Nominal Thickness
in.
Rated Water Working Pressure
psi*
Type 1
Laying Condition
Type 2
Type 3
Type 4
Maximum Depth of Cover--/iff
Type 5
36 50 51 52 53 54 55 56
42 50 51 52 53 54 55 56
48 50 51 52 53 54 55 56
54 50 51 52 53 54 55 56
0.43 0.48 0.53 0.58 0.63 0.68 0.73
0.47 0.53 0.59 0.65 0.71 0.77 0.83
0.51 0.58 0.65 0.72 0.79 0.86 0.93
0.57 0.65 0.73 0.81 0.89 0.97 1.05
200 250 300 350 350 350 350
200 250 300 350 350 350 350
200 250 300 350 350 350 350
200 250 300 350 350 350 350
10 13 17 25 12 16 20 28 15 19 24 32 17 21 28 37 20 25 33 43 23 28 37 50 26 31 41 59
9 13 16 24
12 15 19 27
14 18 22 30
17 22 27 35
20 24 32 42
23 28 38 48
26 31 41
57
9 12 15 23 12 14 18 26 14 18 21 30 17 21 25 34 20 24 30 40 23 28 37 47 26 31 41 55
9 12 15 23 12 14 18 25 14 17 21 29 17 21 25 34 20 25 30 40 23 28 37 47 27 32 42 55
* These pipe are adequate for the rated working pressure plus a surge allowance of 100 psi. Ductile-iron pipe for working pressures higher than 350 psi is available,
f An allowance for a single H-20 truck with 1.5 impact factor is included for all depths of cover. X Calculated maximum depth of cover exceeds 100 ft. For pipe 30 in. and larger, consideration should be given to laying conditions other than Type 1.
CTD000360
3P--5M--4/78--43 1 SO
CTD000361