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HEATING VENTILATING AIR CONDITIONING GUIDE 1941
the statement that a weld is only as good as the workman who makes it. The control Codes now in process of adoption will be the law governing the use of the welding process. These Codes prohibit individual practices contrary to their specified procedure and rules of control, and this is predicated upon the sound requirement that the employer must assume full responsibility for the deposited weld.
It is advisable that this management responsibility be included in all welding specifications and that authoritative standards of workmanship also be specified. The standards of workmanship for this industry are as
Table 8. American Standard Dimensions op Tees and Crosses (Straight Sizes)
for Class 125 Cast-Iron Flanged Fittings
CHAPTER 17. PIPE, FITTINGS, WELDING
set forth in the Standard Manual on Pipe Welding of the Heating, Piping and Air Conditioning Contractors National Association.
A complete line of manufactured steel welding fittings is now available and a dimensional standard is being prepared under the procedure of the American Standards Association to unify heretofore divergent dimensions for the same type welding fittings as produced by different manufacturers. Proposed standard dimensions for elbows, tees, caps, and lapped-joint stub ends are given in Table 10. Dimensions for eccentric and concentric reducers, and 180-deg return bends are not shown in Table 10 but will
Table 9. American Standard Dimensions of Elbows for Class 125 Cast-Iron Flanged Fittings
Nominal Pm 8roa-b
A
Centos to Face Tees and Crosses b-c
AA
Face to Face Tees and Crosses b-c
Diameter or
Flange
Thickness or Flange, Min.
Mbtal<1 Thickness or Boot
i
i*
W
2
2X
3
m
4 5
6
8 10 12 14 O.D. 16 O.D. 18 O.D. 20 O.D. 24 O.D. 30 O.D. 36 O.D. 42 O.D. 48 O.D.
3X 3%
4
W
5
5X
6
8X 7X
8 9 11 12 14
15
16H 18 22
25 28 31 34
7
7X
8 9 10 11 12 13 15 16 18 22 24
28 30 33 36 44
50 56 62
68
4X 4X
5 6 7
smx
9 10 n
13X
16 19 21
23M 25
WX
32
38X
46 53 59^
;
He 14 He X We X We 'He 'He
1
w
1 He IX We 1 Ke We lWe W 2X 2X
We
2X
He He He He He
Ve
He X X He X
%
We X
1
We We IX We W lWe 2
All dimensions given in inches. Size of all fittings listed indicates nominal inside diameter of port. bTees, side outlet tees, and crosses, 16 in. and smaller, reducing on the outlet, have the same dimensions center to face, and face to face as straight size fittings corresponding to the size of the larger opening. Sizes 18 in. and larger, reducing on the outlet, are made in two lengths, depending on the siz* of the outlet. . oTees and crosses, reducing on run only, cany same dimensions center to face and face to face as a straight size fitting of the larger opening. dBody thickness at no point shall be less than 87} per cent of the dimensions given in the table.
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Nominal Pipe Size
.A B c
Center to Face Elbow b-o-d
Center to Face
Long Radius Elbow b-o-d
Centes to Face 45 Deo
. Elbow c
Diameter or
Flange
Thickness or Flange,
Mm.
Metal Thickness or Boot
i
w
I2X 2X
3
3X
4
5 6 8 10 12 14 O.D. 16 O.D. 18 O.D: 20 O.D. 24 O.D. 30 o.d: 36 o.d: 42 O.D; 48 O.D.
3X 3X
4
*5X SX
6
6X 7X 8
9 11 12 14 15
16X 18
22
25 28 31 34
5 w*
5X 2
6 2X
6X 2X
73
7X 3
8X 3X
9 4,
1n0xX
4X 5
14 5X
ieX 6X
19 7X
21X !
24
7X 8
26X 8X
29 9X
34 11
HX 15
49 18
56H
21 ;
64 24 :
**xx
He
He He
5 He He
6 X He
7 We
7X X
X
8X We He
9 We X
10 We : X
11 1
He
13X We
X
16 We X
19 21
IWX
We X
23X We l
25 We : We
2RX lWe We
32 IX IX
38$*
2X
We
46 2X . IX
53 2X lWe
39X 2X
2-
All dimensions given in inches. Size of all fittings listed indicates nominal inside diameter of port. bReducing elbows and side outlet elbows carry same dimensions center to face as straight size elbows corresponding to the size of the larger opening. ^Special degree elbows, ranging from 1 to 45 deg, inclusive, have the same center to face dimensions as given for 45-deg elbows and those over 45 deg and up to 90 deg, inclusive, shall have the same center to face dimensions as given for 90-deg elbows. The angle designation of an elbow is its deflection from straight line flow and is the angle between the flange faces. dSide outlet elbows shall have all openings on intersecting center-lines.. Body thickness at no point shall be less than 87H per cent of the dimensions given in the table.
337