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Insulation and Protective Coatings E8-3. 1 STANDARD THERMAL INSULATION FOR VESSELS -50F to 0F CELANESE CORPORATION OF AMERICA Centra Engineering Charlotte Office HNA 14340 Approved March 7, 1962 CELANESE CORPORATION OF AMERICA INSULATION AND PROTECTIVE COATINGS THERMAL INSULATION FOR VESSELS (-50F. to O^F.) Sponsor - Celriver ENGINEERING STAND ARE E8-3.1 Issued 3/7/62 Rev. No. D TABLE OF CONTENTS 1. Scope 2. General 3. Specifications 3.1 Materials 3.1.1 Comparison of Materials 3.1.2 Thickness Requirements 3.1.3 Calculations 3.2 Method of Application 3.3 Protective Coatings Figure 1 - Dew Point Temperature Chart Figure 2 - Conductivity Nomograph Table 1 - Emissivity Factors Appendix A - Application Specifications Appendix B - Celriver Procedure for Insulating Crystallizers and Acetylizers l*Se 2 2 2 2 2 3 3 5 5 6 7 8 9 17 HNA U34 j (1) CELANESE CORPORATION OF AMERICA INSULATION AND PROTECTIVE COATINGS THERMAL INSULATION FOR VESSELS (-50F. to 0F.) Sponsor - Ceiriver ENGINEERING STANDAAL E8-3. I Issued 3/7/62 Rev. No. D; 1. Scope This standard is intended to specify type, thickness, calculation method and application procedures for insulation used on vessels operating in the tem perature range of -50F. to 0F. where corrosive conditions are present. It also specifies a suitable protective coating to withstand physical abuse where required. 2. General The purpose of this standard is to provide a practical procedure for insu lating cold vessels such as brine storage and head tanks, brine cooled jacketed vessels, and tube and shell heat exchangers (refrigeration equip ment). The material specified is impervious to the external elements including weather and chemical spills, and to internal elements when leaks allow process chemicals to be trapped between the insulation and the vessel. The materials used and method of application represents the most economical way to insulate vessels operating in the above temperature range and to satisfy process requirements.____________________________ The criteria for insulating these vessels are: 1) Maintain required process temperatures 2) Reduce heat gain of' brine or cooling agent 3) Prevent ice formation on vessel 4) Prevent sweating on either vessel or insulation surfaces. 3. Specifications 3.1 Materials. All cold vessels operating in the temperature range of -50F. to 0F. and under corrosive conditions (except where extreme vibration is present) should be insulated with multiple layers of cellular glass insu lation. 3.1.1 Comparison of Materials. There are five types of insulation materials that can be used for cold applications. Three of these, mineral wool, expanded polystyrene, and hairfelt, are not suitable for the conditions of this standard. The other two, vegetable cork and cellular glass, are most HNA 'M342 (2) Engineering Standard E8-3.1 March 7, 1962 commonly used. Cork is clean to work with and offers fair resistance to impact due to its resilience. However, it is difficult to cut and shape in the field for fitting around various obstacles as compared to cellular glass which can be trimmed, cut, or notched very quickly and easily. Cellular glass dust created by cutting operations can result in a minor clean up pro blem unless care is taken to contain it. Labor time can be reduced on most installations by about one third when using cellular glass. Cellular glass is more readily available and can be supplied on short notice, shaped to various contours. Material cost is comparable to cork although cork is slightly higher on the basis of total job cost, irregardless of thicknesses required. The primary advantage of cellular glass over cork is that due to its com position and cellular structure it is unaffected by chemical leaks and spills.' The absorption of water or chemicals by cork will result in cracks because its low tensile strength will not withstand the additional weight. However, cellular glass is a practical insulation to use in either environ ment, whether liquid absorption is a problem or not. 3.1.2 Thickness Requirements. The first consideration in making a selection of insulation thickness is to determine the process temperature requirements. This is usually done by holding to a minimum the allowable heat gain of the brine or cooling agent. In most cases, sweating is the biggest problem to overcome in insulating vessels in the -50F to 0F temper ature range. Therefore, if the insulation is designed to prevent condensation, the heat gain of the brine will probably be minimum and the process tempera ture requirements met. Equally important, along with the thickness of insula tion, is the positive seal to eliminate air from penetrating through the joints of the insulation, resulting in ice build up on the vessel surfaces. This "s the reason for using a good combination cement and sealing compound and staggering all joints. Recommended thicknesses of cellular glass insulation on flat surfaces is shown below for the following conditions: 90F. outside ambient air temperature 807. relative humidity .9 emissivity factor (uncoated cellular glass) 10.50 BTU/hr./sq. ft. average heat gain 0 MPH wind velocity Temperature range 0 to -20F - 4" thick Temperature range -20 to -40F - 4-1/2" thick Temperature range -40 to -50F - 5" thick The above thicknesses are minimum. For borderline cases use an additional 1/2" thickness. 3.1.3 Calculations. The above atmospheric and heat transfer conditions will cover most applications. However, since temperature and humidity vary considerably from one locality to another, required thicknesses can be calculated and verified as follows: (3) HNA 1434/ Engineering Standard E8t3.1 March 7, 1962 Using the formula q = LT 2 -wThere: X K q = BTU/hr./sq. ft. insulation surface T2 = Ambient outside temperature F. (dry bulb) = Lowest inside temperature F. (process or cooling agent temperature) X * Insulation thickness K = BTU/hr./sq. ft./ F/in. thickness (see conductivity nomograph) Example: A brine circulating tank is to be insulated to prevent condensation and main tain a -30F. brine temperature with an outside temperature of 80F. (still air) and a relative humidity of 75%. q = 13.23 allowable heat gain, BTU/hr./sq. ft. of insulation surface. This is found by first determining the dew point from Psychrometric chart or attached dew point graph. (Fig. 1) To use graph follow 80F. line from bottom of sheet to intersection point of diagonal 757. relative humidity line. Read to left of sheet for dew point which is 71. Subtracting this from 80 (dry bulb temperature) we have 9F. difference between air and surface temperatures. Using attached table of values, (Table 1) which gives allowable BTU gain or loss/F. (difference between air and surface temperature), find 80F. on left side of sheet (0 MPH). Read across to column under 9 and find 1.47. Since this is BTU/F. multiply 1.47 x 9 ( difference) for an allowable BTU gain/hr./sq. ft. of 13.23. The values given in the table are for .9 emissivity and represents heat transmitted by convection plus heat transmitted by radiation. ...If .difference be twee.n.-air_and_.aurf ace temperature is more than 10, >- additional graphs can be obtained from Pittsburg Corning so that an allowable q can be found for almost any condition. There are a number of these graphs and a detailed explanation of their use would be lengthy. Since the attached table covers a wide variety of conditions, the additional graphs are not included in the standard. T2 - 80F. ll - -30F. K * .365 from attached conductivity nomograph (Fig. 2) Solving for X we have: X = <T2 - Tj) (K) q x = (80 - (-30)) (.365) 13.23 X'= (U0> ( 365) 13.23 X = 3.05 use 3V thick insulation The calculations shown are for flat surfaces; however, for a.ll practical purposes * Or use alternate data (4' HNA 14344 Engineering Standard E8-3.1 March 7, 1962 the same calculations would hold true for vessels 3 ft. or more in diameter. If exact calculations are desired so that vessel diameter is considered, then r log e v2' can be substituted for X to find equiavlent thickness. ( r^ = rl radius of vessel and r = radius to outside surface of insulation). Graphs and charts showing equivalent thicknesses for pipe up to 24" diameter, where equivalent thickness is important, can be obtained from Pittsburg Corning, 3.2 Method of Application. Manufacturers recommendations should be followed whenever possible. Reference Pittsburgh Corning Specification FI-104A revised, (refer to Appendix A). 3.3 Protective Coatings. Several types of coatings can be used and the one chosen depends entirely on conditions. Some examples are shown below. Condition Type Coating Re ference No vibration, physical abuse, or chemical spills 1. Paint (type to suit conditions). .2 Filler (concrete type) to seal pores, then paint. 3. Heavy, filled paint to seal and paint in one coat. Light vibration, average 1. Asphalt base - cork filled physical abuse, and chemi coating 1/8" to 1/2" thick, cal spills depending on degree of pro tection required. Leaves rough surface, hard to keep clean. Can be sealed and painted. .2 Asphalt cut back, with layer of glass cloth & more asphalt cut back "Re-Nu-It", mfg, by Re-Nu-It Corp., N.Y., N.Y. "Insul-Mastic" Pittsburg Chemical and Coke Co., Pittsburg, Pa. Detailed in Pitts burg Corning FI-104A specification. Subject to heavy physical abuse and direct acid spills. 1. Combination coatings of asphalt base - cork filled mastic, epoxy mastic, and epoxy or erethane paint coat. Refer to Appendix B HNA 14345 (5) nnn'iim!! CORNING Engineering Standard E8-3.1 March 7, 1962 PITTSBURGH CORNING CORPORATION FOAMCLAS INSULATION DEW POINT TEMPERATURES FOR VARIOUS AIR TEMPERATURES AND RELATIVE HUMIDITIES tO 50 40 30 0 TO K DRY BULB TEMPERATURE, DEGREE FAHRENHEIT 100 Preprinted by permission from Pittsburgh Coming Corporation HNA 14346 Fig. l (6) 130 \Z0.. T 0.400 804 .0395 70. -Q390 Engineering Standard E8-3.1 March 7, 1962 30 20 110.. 60. .0.385 10 \100!. 50..0.380 90.. \ 40. -0375 \ -0370 80 70.. 60.. ku 50.. 40J. 30 ..UJ H 20 ..UJ a 10 to \ 30. .0.365 \ 20. \ -Q360 \ 10 \ -0,355 UJ baj,0350 I tO 5 o s cc s -104kQ345 u. ll. L0340 o \ -204 U0.335 fc\ g -30J LQ330 > o \ \ 2 -404U0325 3a zo \ o 0 .. -50.L0.320 0 -10 20 30 -40 30 60 4.-70 ..-80 ..-90 N V-100 u. iLi CC UaJ. 2 UJ H UJ o to z -10.. -20.. -30.. -4CL. -6a -Q315 -0,310 -7a -0305 -80. -0.300 -9a -Q295 ..-110 ..-120 ..-130 .-140 -50 -100 0290 1-150 FOAMGLAS C0NDUCT1V TV NOMOGRAPH UtiM oniwtJ nmm OAkC pat 6- 8" 54 *(V, JL JH T PITTSBURGH CORNING CORP. r, 0. SLAM BLOOM HCM ATI FOAMOLA* IMIUkATtbM Printed In U. 8R*eeppAn.n.rnted by perrission from Pittsburgh Corning rOHM 1101 MV. ! Corporation Fig. 2 n) HNA' U34? Engineering Standard E8-3.1 March 7, 1962 o o rH rH XA rH Os H Csj sO Os rH Os rH CM Os <"H rH O iH rA rH pCM o H PA CO CM CM H H rn rH sO rH H i--1 PA CO Hi CH CM (H rn -3 no 3 CM rH PH CO rH -3 PA rH ch r1A PA rH CH Os CH XA-=r H CH O Os rH CO ON rH OJ -3 rA rH On rH CSJ co prH On rH CM CM rH CM O r-l PA r-vO CM O H rH rH PA CH H rH rH P- CO CH rH rH fA PA O -3 CM rH PA C^XA -3 <M rH CH CM rH XA PA H CH CO NO XA PA rH PH ace w o < I--I H >P c Oe-> a o CW5O uXo. =50 CuO* ^co CO Os ch O CO H OJ o f-O *H p< CO to o P- r-t CM c 0) QJ ` -PO a; so m P- PO so rH OJ rHXA rH CO rH CM CM OS rH 0rH CM rH CM rH C-- rH CM ? ,W' 0 a)\r\ o c Qi u 0> <*-o H-3 Q -7 0' 5 XA rH CM C\J CO o H Ol a> +> DO U CH a> Os SO On CH O CM E-i o CM "so Os' Os H O CM CO CM O SO rH CM sA CM O XA H OJ ch O C -3rH CM O CM O CM H CM O H CM Os-a O Os H SO CO On Os O rH r-- rH rH Os rH CM so xa rH CO -- CM \a prH P~ rH CM cm vr\ r-t SO rH CM O sO r-t XA r-l CM CO -3 O -3 r-t CM -3 po CM rH CM ON CM Os O o CM rH US CM ON rH CM sO O CM O . r"1 ^ O -3 pa O H rn O CO CM CO -J CM XA pr\ CM OS --J CM co pCM Os <-H CM Os O r-l CO r-l CM CH P CM CO H CM P- Os CM CO H CM C-- rH rH P- r-l CSJ CM US, cm t- rH CM 1A Os CM P- rH CM "UN rH r-l SO r-l CM O NO CM sO H CM rH PCM sO H CM CM CO rH -3 f-H CM P- CH r-l XA pH CM* O fCM XA rH CM Os rH O PA r-l CSJ CM \A r-l (A rH CM sO Os rH CH H CM o ochno r-l CM S3 rH CM rH NO rH rH H CM XA Os PA o rH <A -3 CM PA O ~H rH CM Hi CH Os rH CM O XA CH CO H CM CO \A CM p- H CM SO Os CM XA rH CSJ -3 PCM -3 rH CM CO rH rH CM H CM o CM HI rH rH PA Os M3 PA O p-H CH CO Os CH On H CM sO Os CH CO rH CM -3 O CH CO H CM O rCH>0 rH CM r-- o CM \A rH CM HvO CM CM rH CM sO O -3 CM rH CH rH CH CMJ -3 O rH CH rH \A -3 Os H CM Os XA CH CO H CM NO CM CH PrH CM CHnO CH\A rH CM CO rH CM CH r-l CM rH tA XA CM rH rH O CO XA rH -1 CH ON O -3 rH rH CH CO rH -3 O rH rH XA rH _3 Os rH CM o p- rH CM CO -a PAXA rH CM -3-xa CH CH rH CM XA PA i-H rH sO ch XA CSJ rH rn -sr pXA rH rH CH CH sO XA O rH CH O CO XA Os H CM -3- CO rH CM -3 N -3 sO rH CM Os rn CH-3 * rH CM u & X 5* r>OO0HH) XX 2 XX XX XX kk XX 2i Xx e? g XX kk XX 8: XX kk XX kk as x 2 .<3 O XrHA O XrHA O XrHA O XrHA O XrHA O XrHA O XrHA O XrHA O XrHA O XA pH O XrHA Uo rOH O CM pH O CH OO O XA NO PO- COO OO Os rOH Table 1 (8) HNA 14348 Engineering Standard E8-3.1 March 7, 1962 FOAMGLAS APPLICATION SPECIFICATION! ...for LOW TEMPERATURE Equipment and Piping (Below 70F.| This specification covers the application of FOAMGLAS insulation for use on equipment and pipinf normally operating at temperatures below 70F. It is applicable to either indoor or outdoor service. (9) Appendix A Engineering Stands E8-3.1 March 7, 1962 Table I MINIMUM SUGGESTED THICKNESSES FOR SPECIFIED TEMPERATURES Figures in table ire degrees Fahrenheit and are minimum temperatures for use with thichness and design conditions stated. When design temperature (alls between two thickness columns, use the greater thickness. Table is based on thickness required to pre- vent condensation on surfaces with .9 emissrvity, in 90* F still nr at 80% relative humidity. Heat gams average 8-9 Btu/Hr/S.F. insulation surface. Where other design conditions are used, thicknesses should be adapted to meet job requirements Iron Pipe Size Nominal FOAMGIAS Thickness ' BiMHBMH 3/r D IV," WBBB1 6V," wuwmm B fBBBCfl iovr Q[ 11'/;' IS VT >' r 1VS' ivr r IV," 3' 3VT 4' 4K' 5' 6' r r r l<r lr 12' 14' - 16" 18' 20" 24' 28* 3r 36' 45 10 -25 -45 -95 -140 -275 -300 -335 -390 -450 50 25 -10 -25 -70 -135 -225 -255 -300 -340 -415 -450 50 25 -10 -25 -70 -130 -180 -255 -300 -340 -415 -450 50 30 5 -25 -60 -105 -145 -200 -265 -315 -375 -425 -450 50 30 15 -15 -45 -100 -120 -185 -230 -290 -345 -390 -440 -450 50 30 15 -15 -45 -90 -120 -175 -225 -290 -340 -385 -430 -450 50 30 15 -10 -35 -60 -105 -130 -175 -235 -290 -330 -375 -415 -450 60 30 15 .-10 -35 -60 -105 -135 -175 -235 -290 -330 -370 -415 -450 50 30 15 -10 -35 -60 -105 -135 -175 -235 -290 -330 -355 -410 -450 50 30 20 50 30 20 0 -30 -55 -85 -135 -160 -205 -255 -300 -340 -375 -420 -450 0 -30 -55 -85 -135 -160 -205 -255 -300 -340 -380 -420 -450 50 45 25 50 45 25 0 -25 -45 -80 -110 -140 -175 -220 -270 -305 -345 -380 -415 -450 0 -25 -45 -70 -105 -125 -160 -195 -240 -290 -325 -360 -395 -430 -450 45 25 45 25 0 -25 -40 -65 -95 -120 -150 -185 -220 -275 -305 -340 -375 -410 -450 0 -15 -35 -60 -85 -115 -145 -175 -215 -255 -295 -325 -360 -395 -425 -450 45 25 5 -10 -35 -55 -80 -105 -135 -170 -200 -240 -265 -315 -345 -380 -415 -445 -450 45 30 10 -10 -25 -50 -70 -105 -125 -150 -185 -225 -265 -300 -330 -360 -410 -420 -440 -450 45 30 10 -5 -25 -45 -70 -105 -120 -145 -175 -210 -255 -290 -320 -350 -380 -410 -435 450 45 30 15 -5 -25 -45 -65 -95 -115 -140 -170 -205 -245 -285 -325 -340 -370 -400 -425 450 45 30 15 0 -25 -40 -55 -80 -105 -130 -160 -190 -225 -265 -295 -325 -355 -380 -410 430 450 -'45- -3T 20" - 0" -25" -35 -5b -75 "TOT ~I25~ ^2itr ~-2'85 -310 -340 -365 -395 425 450 45 30 20 0 -25 -35 -50 -70 -105 -115 -145 -175 -200 -235 -275 -295 -325 -355 -380 410 435 450 so 30 20 0 -25 -35 -45 -65 -95 -110 -135 -165 -190 -225 -260 -290 -315 -345 -370 -395 425 450 50 30 20 0 -25 -35 -45 -65 -85 -105 -130 -155 -180 -205 -240 -270 -300 -330 -355 -380 405 430 50 30 20 5 -10 -25 -45 -60 -80 -105 -125 -145 -170 -200 -235 -260 -295 -315 -340 -365 -390 415 50 30 20 5 -10 -25 -40 -60 -75 -105 -120 -140) -170 -190 -225 -250 -285 -305 -330 -350 -375 400 1 50 1 30 20 10 -5 -25 -55 -75 -105 -115 -135 -160 -185 -215 -240 -280 -300 -320 -345 -365 -390 Vessel O. D. 30 25 10 | -5 -20 -35 -55 -70 -95 -110 -130 -155 -175 -195 -230 -260 -290 -310 -330 -355 1 -375 48' 50 30 25 10 -5 -20 -35 -50 -70 -90 -105 -125 -145 -170 -190 -225 -245 -280 -305 -325 -345 i -365 1 54' 60" 50 ~ 1 50 35 40 25 25 10 -5 10 -5 -20 -35 -50 -65 -85 -105 -125 -145 -165 -190 -215 -240 -270 -295 -315 -340 -360 I -20 -30 -50 -65 -85 -105 -125 -140 -165 -185 -210 -230 -260 -290 -310 -330 1 -350 i nr66' 50 40 25 10 -5 -15 -30 -50 S_65 -80 -105 -120 -140 -160 -180 -205 -230 -260 -285 -3051 -325 i -345 7r 50 40 25 10 -15 -30 -50 -65 -80 -105 -115 -135 -155 -180 -200 -230 -255 -285 -305 -320 i -340 78' 50 40 25 10 1 0 -15 -30 45 : -65 -80 -105 -115 -135 -155 -175 -200 -225 -250 -280 -300 -315 i -340 96' 50 40 25 10 I 0 -IS -30 45 ! -65 -80 -105 -115 -130 -150 -170 -190 -220 -240 -270 -290 -310 '-330 ior 120" Zj 50 i 50 40 40 25 25 10 0 10 0 -15 -30 45 -60 -75 -105 -110 -130 -150 -170 -190 -215 -240 -265 -290 -305 ---3-2-5- 11 -15 -30 45 -60 -75 -105 -110 -130 -145 -170 -190 -210 -230 -260 -290 -305 1"320 | 144' Over 144" to Flat 50 1 50 40 40 25 25 10 i 0 15 I 0 -15 -30 45 -60 -75 -95 -110 -125 -145 -165 -185 -205 -230 -255 -280 I -300 1-305 -10 -25 40 -55 -65 -80 -105 -115 -130 -145 -165 -180 -200 -220 -240 1 -265 -290 Copyright 1959 Pittsburgh Corning Corporation (10) Appendix A HNA 14350 Engineering Standard E8-3.1 March 7, 1962 Prior to the application of any insulation, all metal surfaces shall be thor oughly cleaned. The metal should then be primed with either a rust inhibit ing paint or an asphalt mastic depending upon the temperatures involved. I. EQUIPMENT A. Thickness Equipment shall be insulated with thickness of FOAMGLAS insulation as shown in Table I. Insulation thickness shall be determined by lowest temperature at which the equipment normally operates. B. Insulation Supports 1. Vertical Equipment a. Angle or plate supports shall be welded around the shell at top and bottom. b. On equipment requiring multiple-layer insulation, horizontal leg of support shall be of such length as to support 1/2 the thick ness of the outer layer of insulation. Horizontal leg of insulation supports for single layer application shall be of such length as to support 1/2 the thickness of the insulation. C. Application 1. FOAMGLAS insulation shall be curved sidewall segments or beveled lags fabricated to fit the diameter of the equipment to which it is applied. Insulation shall be applied in staggered position with all joints tightly butted and secured with specified strap in sufficient tension to hold insulation in place. a. Additional layer or layers of FOAMGLAS insulation, where specified, shall be applied in the same manner as the first layer, with side and end joints staggered over joints of preceding layer, so that no two joints coincide. b. All butt edges and ends of outermost layer (or single layer) shall be sealed with a buttered coat of joint sealer. c. An additional layer of FOAMGLAS insulation shall be applied over the outside layer where insulation supports are located. d. Typical installation shown in Figure 1. 2. Each layer of FOAMGLAS insulation shall be secured in place with stainless steel strapping, on 9 inch centers, where contour of equip ment permits firm and effective attachment. a. On irregular surfaces, where use of insulation strap is impractical, FOAMGLAS insulation shall be secured with stainless steel wire. vtSJli-J HGUIE 1 HOC TIGHT WITH CUSHIONING MATEIIAL. OUTEI LAYEI JOINTS Smau IE COATED WITH JOINT SEALEI. key noarro iest ON SUPPOtT JOINT SlALEt SUP-JOINT. HEAVY FILLET OP CAUUCING MASTIC FOAMGLAS INSULATION CONTRACTION JOINT (ID FKSUIE 2 HNA U351 Appendix A Engineering Standa E8-3.1 March 7, 1962 b. Head insulation, as well as insulation around manholes and other connections, may be fastened in place using a floating ring of steel rod or stranded cable. One end of the band is fastened to the floating ring and the other is anchored to an extra band or bands placed around the sidewall insulation. Bands shall be spaced on 12 inch centers around the perimeter of the extra band or bands. 3. Contraction joints shall be provided below insulation support as shown in Figure 1. Where more than one thickness is specified for the equipment, an insulation support shall be provided at the junction of two different thicknesses and insulated in similar manner shown in Figure 2. 4. Where equipment is .supported on metal cradles, FOAMGLAS in sulation shall be carried down over cradles and shall be installed as shown in Figure 3. 5. Where equipment is supported by structural steel members, FOAM GLAS insulation shall be extended not less than four times the speci fied insulation thickness in each direction, measured from junction of . equipment with insulated support lug. Thickness of insulation over steel supports shall be one-half that specified for body of equipment. Thickness of insulation over support lugs to be the same as body insulation. Installation shall be as shown in Figure 4. 6. Equipment legs shall be insulated w:,h FOAMGLAS block as part of equipment area. FOAMGLAS insulation to extend over structural legs and down legs a distance of four times insulation thickness. Thickness shall be as specified for body of equipment. Body insulation shall be brought up to and butted firmly against tank leg flange. Spaces between flanges and webs of structural members shall be filled with FOAMGLAS block cemented in place with an approved ad hesive. Installation shall be as shown in Figure 5. 7. Skirts supporting vertical equipment shall be insulated inside and out side as part of equipment area, FOAMGLAS to extend downward from junction-Of"inside~oFskirrwilh insulatedTjottomTiead a distance of not less than four times the thickness of insulation, but in no case less than one foot. Thickness shall be as specified for body of equip ment. FOAMGLAS insulation shall be secured to inside of skirt with an approved adhesive. FOAMGLAS insulation inside skirt shall be supported on angle or plate support. Blank nuts on 12 inch centers shall be provided on inside of skirt for securement of bottom head insulation. Where welding is prohibited, a punched, expanding split ring type angle shall be used. Installation shall be as shown in Figure 6. *Oa/*G~AS INSULATION of VESSEL ClAOlES t SUfPO*T$ fGuE 3 OUTft IATEI JOINTS Shall COATED fOamGiaS inSuIaHOn On VESSEL LUGS AND SufPOITiNG $Tt, (12) Appendix A POAMGIAS biiuiiKd i.ng standard E8-3.1 March 7, 1962 THICKNESS T OUTER LATER RUTT joints Shall IS sumCOATED WITH joint STRAP aSOUNO CIRCUMFERENCE SECURE lie INSULATON WITH STRAP ANO APPROVE) ADHESIVE huvy fian of Caulking mastic THICKNESS T tank leg COAT top Of CONCRfTE with joint sealer lEfORf APPLICATION Of INSULATION FOamGLAS INSULATION ON VESSEL LEG FIGURE S FOAMGlAS INSULATION ON VESSEL SKIRT. FIGURE 6 D. Finish 1. After specified thickness of equipment insulation has been installed, an approved coating shall be sprayed, brushed, or troweled on to a minimum thickness. While coat is still tacky, an open weave (10 x 10 mesh) glass membrane shall be laid smooth and thoroughly em bedded in coating. Care must be exercised that weave does not rupture and that cloth is overlapped approximately three inches (3") to provide strength at joint equal to that maintained elsewhere. 2. Before surface becomes dry to the touch, a second coating shall be sprayed, brushed, or troweled over the reinforcing cloth to a uniform thickness not less than 1/8 inch thick, with a smooth, unbroken sur face and allowed to dry. 3. Application of coating shall be built up in a uniform manner to pre vent uneven contraction and tendency toward surface cracks. When spraying, care should be taken that air is directed at sufficient pressure to obtain maximum atomization without pock-marking of surface owing to excessive velocity. Slugs shall be removed from surface immediately. Da. Finish (Alternate Application Method) An open weave 10x10 mesh glass membrane may be spot tacked to the insulation and the finish coating applied through membrane as a single application. Coating should be applied in accordance with manufac turer's recommendations. E. Flashing On equipment located outdoors, it is imperative that proper flashing materials and methods be used at nozzles, manholes and other projec tions, as well as at the junction of horizontal and vertical installations. F. Painting When asphaltic materials are specified for the weathercoat and paint is desired, it may be done as follows (usually by separate contract): 1. As soon as asphalt surface has dried, the surface shall be painted with an asphalt base aluminum paint. 2. If aluminum finish is not desired, the asphalt surface shall be sealed with asphalt sealer and painted to desired color. (13) Appendix A II. PIPING Engineering Standard E8-3.1 March 7, 1962 A. Thickness All piping shall be insulated with the proper thickness of FOAMGLAS insulation as shown in Table I. Insulation thickness shall be determined by lowest temperature at which the piping normally operates. B. Application 1. Where single layer "Factory-wrapped" insulation is used, application shall be made as received, with joints tightly butted and sufficiently buttered with specified joint sealer. Wrapping laps shall be brushed with asphalt cut back and pressed firmly in place. 2. Where single layer "Regular" insulation is used, the FOAMGLAS insulation will be applied to piping with butt joints staggered and all joints tightly butted and buttered with joint sealer. A finish shall then be applied in similar manner as called for under "Equipment" in these specifications. 3. On multiple-layer insulation, where specified, the additional layer or layers shall be applied with side and end joints staggered over joints of preceding layer. 4. Only outer layer joints of multiple-layer applications shall be buttered with specified joint sealer before installation. The joints shall be drawn together when FOAMGLAS insulation is applied so that only a very thin vapor seal separates the section of insulation. 5. FOAMGLAS insulation shall be applied with all joints fitted to elimi nate voids. Large voids shall not be filled with vapor seal coating, but eliminated by refitting or replacing insulation. 6. Where piping is subject to excessive vibration, the bore of the inner layer shall be coated with a thin application (to fill surface cells only) of specified bore coating, and allowed to dry before application of insulation to piping. 7. Single and outermost layers of pipe insulation shall be secured in place with stainless steel insulation strap on 9" centers. 8. After specified thickness of insulation has been installed, a finish shall be applied as called for under "Equipment" in these specifications. 9. Contraction joints shall be installed in both horizontal and vertical straight run piping when piping will be subjected to temperatures which dictate the neces sity of such joints. Chart at right may be used as a guide for determining number of joints required. DIFFERENTIAL CONTRACTION BETWEEN FOAMGLAS ANO METAL PINING a. Joints shall be loosely filled with cushioning material. b. When contraction joints are re quired, contraction should be pro vided by and in the flange cover of flanged joints when they occur in the line. c. Typical installations shown in Fig ure 7A. B. C. (14) HNA !4 3`>4 Appendix A fOAMGLAS ^^ INSULATION Tl. JOINT SEALER SUP JOINT FINISH Engineering Stand E8-3.1 T <ryr i- SPACE FILLED WITH CUSHIONING MATERIAL ONE LATER CONTRACTION JOINT FOAMGLAS INSULATION CONTRACTION JOINTS FOR HORIZONTAL PIPING. NOTE: ALL OUTtR LAYER JOINTS COATED WITH JOINT SEALER. FIGURE 7A FINISH FOAMGLAS SLOCK KEYED TO SUPPORT - JOINT SEALERx'1 ' 1 SUP JOINT--' .` INSULATION SUPPORT FILL WITH CUSHIONING MATERIAL MIN. Vi T MIN HEAVY FILLET OF CAULKING MASTIC OUTER LAYER JOINTS SHALL BE COATED WITH JOINT SEALER OUTER LAYER JOINTS COATED WITH JOINT SEALER. T, FOAMGLAS FINISH SPACE AROUND FLANGE PACKED WITH CUSHIONING MATERIAL. THE TWO HALVES OF THE COVER E CEMENTED WITH JOINT SEALE I APPLIED to THE OUTERMOST 2 '/, I APPROX.) OF THE JOINT FACES VS' MIN. ROUND OUTSIDE CORNERS. HEAVY FILLET CAULKING MJLSTIC. FOAMGLAS INSULATION VERTICAL CONTRACTION JOINT ON PIPING FIGURE 7B FOAMGLAS INSULATION ON LINE FLANGE. FIGURE 7C 10. FOAMGLAS insulation on flanges, valves and other fittings shall con sist of prefabricated fitting covers of the same material and thickness specified for pipe insulation. a. Fitting covers shall be applied in same manner as pipe insulation. Stainless steel insulation strap will be so located that maximum strength and securement shall be obtained. Fitting fillers are not necessary, provided all joints are properly sealed. b. Protruding metal parts (such as valve stems) shall be thoroughly sealed. c. Hangers shall be on the outside of the insulation and shall not be in contact with the pipe. Curved metal shields shall be used be tween the hangers and the bottom of the insulation. Shield and hanger spacing shall be designed to limit the compressive stress between hanger and insulation to 35 psi. d. Outer surface of fitting covers shall be reinforced and finished in the same manner as specified for pipe insulation. Care shall be exercised that reinforcing cloth overlaps connecting pipe insulation a distance of not less than six inches. C. Painting When asphaltic materials are specified for the weathercoat, and painting is desired, it may be done as follows (usually by separate contract): 1. As soon as asphalt surface has dried, the surface shall be painted with an asphalt base aluminum paint. 2. If aluminum finish is not desired, the asphalt surface shall be sealed with asphalt sealer and painted to desired color. (15) Appendix A RECOMMENDED ACCESSORY MATERIALS FOAMGLAS PIPING AND EQUIPMENT te-d.1 March 7, 1962 1 MATERIALS USE TEMP. RANGE SOURCE Regular Hot Erection Asphalts Adhesive d Sealer - 50F. to 150F. Refineries RR-1950 (Erection Asphalt) RB-2813 (Erection Asphalt) Adhesive d Sealer -- 100F. to 150F. H.H. Robertson Co. Adhesive d Sealer - 25F. to 200F. Farmers Bank Bldg. Pittsburgh, Pa. Pittcote 300 Fibrated Asphalt Cutback Coating d Sealer - 40F. to 250F. Pittsburgh Corning Corporation Pittcote 400 Vinyl Emulsion Mastic Coating - 50"F. to 180F. Pittsburgh Corning Corporation Pittseal 111 Sealer d Slipjoint -- 100F. to 300F. Pittsburgh Corning Corporation PC Mastic 100 Sealer d Slipjoint - 50F. to 125F. Pittsburgh Corning Corporation Anti-Abrasive Compound 1A Bore Coating -- 300F. to 150F. Pittsburgh Corning Corporation Keenes Cement Bore Coating - 25F. to 500F. Local Builders' Supply Firms CS Daint White insulation coating Lagging adhesive for light-weight fabrics - 10F. to 125F. Pittsburgh Corning Corporation Primer Sealer 3A Asphaltic Primer - 50F. to 150F. Pittsburgh Corning Corporation Glass Fabrics 10x10 asphalt treated 10x10 plain Membrane for asphaltic coatings Membrane for vinyl coating's (determined by coating used) Pittsburgh Corning Corporation These-specifications-arc necessarily gerierat in nature arid Uu nut uuvgnrtt~posslble methods of application. Application procedure is at the discretion and responsibility of the design engineer to meet specific job requirements. Litho in U. S. A. COR N Appendix A I R.IOXA R*. 10M.1 CELANESE FIBERS COMPANY Celriver Plant REPAIR General Instructions for Insulating Crystallizers and Acetyli'zers Engineering Standard E8-3.1 1 March 7, 1962 Maintenance Dept. Procedure VM3-00lil Date 10-30-61 Supersedes Procedure I. Crystallizer Insulation Procedure, 1. All surfaces are to be clean and free of rust and scale. Jacket, nozzle, and supporting beam repairs are to be complete. Acid drain lines, etc., are to be complete. Retaining ring, pan around stuffing box, any other anticipated mechanical repairs should be completed if possible to avoid later damage to insulation. All mild steel parts should be thoroughly primed and painted before insulation is applied. 2. Material specifications - See B*M., Page 2. II. Acetylizer Insulation Procedure 1. All surfaces are to be clean and free of rust and scale. Jacket, nozzle, and supporting beam repairs are to be complete. Sheet metal boxes (s/s) are to be installed around four stationary arm bolt locations. Any other mechanical repairs should be completed if possible to avoid later damage to insulation. All mild steel parts should be thoroughly primed and painted before insula tion is applied. 2. Material specifications - See 9.M., Page 5. (17) Appendix B HNA 14357 Engineering Standard E8-3. I March 7, 1962 t/.i-00L2 on nod Rod Used o n ly when g u id e b e a rin g and housing rem ain on bottom o f c r y s t a lliz e r . i gi"- S <M 3 oY m P 82 8 e3 O d r-- -O' o 1 iT co o H 00 vO m u> \f\ o CM CM -d -d vO Os vO CO O ttf r*\ O o rA rH rH \A in in CM CM -3 .* m3 -3 ? s c*\ pp u u Ui X a cL 3:r *ui wQ i* Q _C S aE_i c! O c Ui UJ B a Ol u 8 O * 43 p be B y-- Q CO 43 H d *T3 <0 4ft rj O 1 > e 0 H * +5 io A 43 (4 CD d 0 e eft (0 in in H NO NO H 03 n/i rH h (0 4ft CO I t Oft tfi rH X 4ft t0 H H 0) Hu Vi 4> M 14 3y <J f-3 a 4ft M 5 CO 43 m CO A (M c a> 43 > O +> Cm 43 V <m 4) jC t* V 0 0 4) CO H 4^ J3 43 0 CJ O A cm 88 C M o TJ H n % O <M Qj 2 t, D 8 > EE o X 0) T5 til V E3. E E o cO d o Cm cm 03 t- 3 a 0) U 0 * o 3 i +> o 0) o > J5 6 2 (0 >P t3 cd tM 4Os > <m o 1 U 2 43 8 T3 3 14 %0 * 43 \A O tft OJ O Ml 1 T3 4> cm 0) H o s (0 4) o H VO <0 r H cO a P 4J CO o H mI (0 CO x 4J y e e <m TJ 4) 4ft 0 o d CO u 43 Cfl t4 X O W u 0> CO CO u CO id w id & o CO d is E ,o to o >> u th o Q> o o E 0) m o 2J3 i 4J c r-1 ,3 *o C O X CO Xi TJ 43 >> o X3 43 X) TJ o B 03 r-4 NO X JO u * M X o ca 43 X 2 c5 -H3 01 -----<T - r** 9 cm j8 p CO 3 '43 J6 - n --<0 r-H CO n "43 "43 0 Ai b Cm c T> CJ _h h 43 X CO 4> tx 3 a 1 S ao Q c 0 (0 0 CO X 43 0 V) V) 4ft o H cn Q o crl <7 c0 f*1 h +: d Pu ca cn cn cn C/1 c * t o H cd H a3 M c c r c N c c aa o o oo H T" *3 d rt cc <0 a 3H r- S3 p q 10 bi wl 5v5 dc MM +> 43 tO 0 H o CO co 43 4ft u < (0 o; 03 H V) CO 2 H 01 CO 4ft C 41 cd d 1 t sH g ic CO 4J ij a O 3>5 d Wf EC cn ee on r* B B B i-in n*i n" CM H u, 0) a c51 o H- 3 a. Ui e CO X ue fl CN 0 r~ 1 1* 11 ^ s | V) 8 i C3 nv 8 D i- e CE r e CN 4. ft- 0 c c* e B Be CO _~ co Cs CN r- x X HK e 8 BB c\ ac CO CM r* r- p- H i4 4J 4- 4J 4J ft- V Cm <m < /er cr c- c Cc 0 i <0 H o & ec <. c- f <*- e rH IT cr r- ti o 1 ft- uS vC * aJ a_3 <h <M Sc u c r; CO cv r- c li-* HOT 1* * ou. -Ir uI z m *<* X aaS.. Uh<i <o aK. Hwi CL < <O Vco c0o) ao o uo M 7j 1 4-> <0 z o UI ^ m co -J Q 4-> A g V eft a vu 3n v* 3 & o < 0O O >- o ft. o Uai -oi Appendix B (18) HNA 14358 Engineering Standard E8-3.1 March 7, 1962 7M3-0013 \\ \s 'S \S V*1 U Application Procedure fepUNble vher* a^waton Joint boa boon ranrrvod free Jackal, ahaft ahortoned oo Uul It doa# not protrude (brooch bottoo of waaal, and dlaenerga al*a raloeatod to top of aootyllter* afore atartlng insulation, rplj J/16* (Met coat of Olloonlta to Unk nvoort braebata (all orar) and both aid** of nveorUna tuatl ork for about 12* aneh aida of tank import brackets* Maid 7/6* lodcwthora around betton flange anroxlnetely 6* to 7* (part, tackle li ft. long atr^a to aeeh vaahar. Maid ten 6* lorg s lA* die. roda ^prox, J0 ^>rt around fluffing box. Mold tvo ring a (l/l* dla. rod) to tne nrUul roda, ona rlr^ J* froo Motion af voeeol, and the other 6* fro* bottoa of vueeal, buckle Lx to ti atrapa, l ft. long, to aaeh ring aa required. ^ Apply lat Uyar of Insulation to botton, euttlry. to fit aa required. Van l/? mabar of straps InatoUad in St^ 1 to retain lat layer by pulling atrap a on oppoalto aldoa of tha voeeol aeroaa tha Inaulatlon and bvptlinc *trapa togathar chore they wet. Apply fed layor (etagger all Jolnta) urtnr reneJnine half of atr^e to retain. Apply lat Layer lnoulatlen on rldo of veiael, itartlng with bloeko rooting on betton flonga. Out ovary othar block in half (lat eeuraa only) to provide proper tfragwaal of block* for atoggorad Jolnta, Apply fed loyar Inaulatlon on aldoa, alerting with bettoo block a flush with bettea insula* Uaa, Top b leek a tfteuld extend 5* above S/S top of **aaal (2nd layer an aldoa bias aarvaa aa lot Uyar an tank flangee.) Wotoi DaejA * Ada S/S bands and buck laa an 6* to > eantora to retain beUt 1st and 2nd layers* Apply fedlayer Vo top and betton flants using kdnlnua of 5 atra on ae4i flange* ^ Apply latUyar (2* thick) aa tap using strep to build on bait haada to aaka thaee surface* even with Uu lat l^er, (t) feply fed layer () thick) an top, of outor ring and around 0 Apply blooks or piefarurd pip* lnsulaUan (2* thick) inund noaalos proireding fren betten ^ ad tank. doadi dowl pins, afeaalva, and rtr^i are uaad to hole In pUao* 0 Fill veld ^aeo arvaid dlstfiarge vulva housing vlth flbargUt (blonkst typa) laaalotlan* @ Apply Inflation (ona 1}* Uyer) to antlra discharge lina, building ip around eld vulva hoealng and flange*. Ratalo 1U dovala, adhesive, and atr*>s, feply ano )* blade to oover shaft flonr*. Aatala nth aono af the atr*># installed In Stop 1. etot 1, Apply Mealv* to antire Inal da aorfaoa and four adgaa of Insulation blocks (all layarv) to inetre peel live sir (nrrtv, I* 1* 0*0, flaAbla i1 ddias tetri ng can ba aad affacUvely to hold Inaulating bloeko in plooe pitll batda eon bo IntULUd. 7 i Si is <D ii HNA 14359 Appendix B Engineering Standar E8-3. 1 March 7, 1962 7M3-00hii W AocUoatlon Procedure - AlU^^ Arnnaenant AppUoable where abandon joint la atill la jacket, ahaft protrudes through bottoo of naiel with external guide bearing, and original discharge uelee la a till uecd. 9am aa Standard Procedure exo^t ftrap length can be out to 2 ft. (2) Weld 10 W U-3A* S/9 note around botten bearing pedeatal with 3/8* die. red nMng through the note foridng a amtar ring. Buokla an equal maber (te theaa installed in Step 1) of benda about 2 ft. long to thla oenter ring. w Sam aa Standard Prooedure axoept outaide atrapa will buokla togather uith straps fro* canter ring. @ Sam aa Standard Procedure. (E) Sane aa Standard Prooedure exempt let layer blouke ulU baee to be out to aloar a^aneion joint in jacket._______________________________ _____________________________ 9am aa Standard Procedure. Apply 1| laaelaUea to discharge Una bolov nlft flange. (A (20) HNA 14360 Appendix B *. ea I u\ -a ujB is 8 5 8 Engineering Standar E8-3.1 March 7. 1962 3 -a CN 3 O NO Os r- t- O 0 rH f*N 1 1 11 co oo 5 rH NO OO OH C*k 0 V\ \A CM >0 UN CNJ _P -P -a -3 UJ Z A c e ty liz e r In s u la tio n - M a te ria l f o r One Vessel vt vO i 88 I1^ Bs j I I | I <B. u m at 3 > (0 -i Q) > o B CO rH Tc3 6 cO o I c 0 On rt +> a a X ,r--x a o1 0) 43 0 0) 43 B NO 1 S O 1 o H> 2 | <4 <0 u CH bo O CM eo cn o H 1 , to bO rH <u 43 5 p H 4J p H 43 Cm -p 0) 4> cO tH to H rH Cm 0) <M P 4) to 43 H Cm 43 p n o 43 H Cm rIHfl p to >> CO P 0) > x43; -=3 H HrH 0) 0 O O' 2 2 > Op 43 2 20) c rH rH H <* 0 O 1& * s I 1 1 1 1 u I 1 1 | | u 1 II -Is "0 0)0 Q) n i E 05c <l)CO m co > M TJ <D (0 P no a a .c c "0 tn = CD O-c o iw o 30*0 P T3 4) <D > Ew E pH o <n 0) c P o CM w wCO co *H ou p CO pH rH TJ o 0) E CO 0) O T5 <M 0) (0 P o co to l. X a) Uo >, <0 rH T3 0) < 0) >r- E oa Po XI b M ct 0) P r- p a'Cr p> o t to P * 0) o o >. ( <0 C rH rH<*- T3 a> E u o cm 0) CO X oo pH be u cO o CO H T3 c o u 0) >1 cq rH XJ CD O a 14 a i CO o o rH 0) >o 43 0) rH T3 CsM v--r* e CM H 43 \A X3 cO 43 * 43 43 CM i 0 u a rJH9 r-n3 cO NO rH > Cm O 0 H 43 t. 05 05 0) 05 CD cO > CtJ U O o o O O rH rH rH rH E 0) O 03 TJ C cO pH cO O E 0) x: 0 X3 m|Cm c p aCO O 0 CO e tn eg] 25o +>-c O <fl fcu r0 J3 to to bj E <o3 Ci. p (0 H a > 0 X cti X> 43 CO 0) cO pH rH g (o0 Q tip O XI x> T3 T 43 0) to CO 5 <N w 0 = 5 pH b. E *C g 5 o o # l- cO O Q fH O 0 O X3 c O X3 x> W CO eo pH Cpn 0) CO CO cO rH rH 0) 5 0 p gi 0) 43 cO O c O rot <0 0 05 O a tui Cl4 C14 Ci^ u BP X) 05 43 43 tn CO tn tn *H a, s CO Ncol "S, CO \ CO CELANESE CORPORATION OF AMERICA ENGINEERING DEPT. C fc L riie r------------- 0) (0 >0 4H CJ 05 cco 2 4-> [ CO 3 to c cC c t- n 5 c co H +3 ct r CO oc Co 43 4H3 Ct r- 5 Pp CO G 6: c C O C p C a> 4^ C OO ct fcu iH r H H OC 43 5 P tco 43 H> < 3 Ct 5 p CO 1 1 V] 1 H 0 0: to 05 43 Ccc c p CO n. 0 '3 u0 2 0) pH Cu 0 0 M h w M M w w M M M CO 03 < C2 UJ o CO < BBB r- r' B CH s r* nlr CM XX X XXX S e e B -r2 O > C. CC r-- ac CO r-- CO -G ~ rH CS C\ CNJ H X 4-> 4- X X B 2B X XXx g BBB s e cv c\ c\j CC ac CC P"V r r~ i-- r-- r-- rH h1^ a X X (0 5 rHr r- BB X B co V . r4|r \ f. c H 4 s +j 1 < r g tr ,, 8 ccc 8 2C-* NOT 3-*`*"A* 4- 4Cl. r1 r' 0: 0 C* c cV r" r- 4V r 03 cr o i 43 Cm r tr c) | (21) 1 4XX V Ci. Cm P 4 r r 1 tr 0 0 V b1 cc ,u c \r C\ rr r~ t# C j < c t 4 c c vr U\ <cs- P" HNA 14361 Appendix B Engineering Stands E8-3.1 March 7, 1962 VK3- 1 !i \I Exhibit B (22) HNA 14362 Maintenance Department Procedure Engineering Standard E8-3.1 March 7, 1962 VM3-OOli7 III* Protective Coating for crystallizers and acetylizers insulation. 1. Material requirements - See B.M., Page 8. 2. Application procedure (both vessels). a. Insul-Mastic (Gilsonite) Trowell on directly over smooth Foamglas approximately 1/16" to 1/811 thick and thick as required to fill in holes, cracks, and cover metal bands. Allc to dry thoroughly. Hot air, infra-red lights, etc., will reduce drying time b. Carboline Hardtop #3 Mix according to instructions (reduce amount of water if sand is wet) and trowel on top of vessel. Thickness should vary from about l/2M in center of vessel to 1/8" at outer perimeter. This will provide a slight slope which will drain off water or acid spilled on top. Pea gravel can be used as an aggragate to fill and strenghten mix. Allow to dry at least 8 hours. c. Carboline 12200-21 Mastic Mix equal parts of Conponent A and Component B to make one part (|- qt. A and ^ qt. B 1 qt. mixture), 3 to 32 parts special silica sand, and 1/2 to 1 part ground asbestos. It is extremely important that Components A and 3 be mixed properly. Due to the fast set-up time and unless more than two men ar: working, not more than 1 qt. of each conponent plus 8 parts of sand and asbe: tos should be mixed at a time. Mixing can best be done using a slow speed 1, drill motor and 1/2" rod about 3 ft. long with blades welded on the end. Tvc men applying and a third mixing gives most efficient procedure. This material is not easy to apply and some experience is required to do a smooth, good-looking job. Upward strokes should be used on vertical surface: - and minimum number of strokes should be used as the material will tend to st: to the trowel. A good, heavy pressure on the trowel on each stroke will mini mize this sticking and provide a smoother finish. Tools can be kept clean ar moist with special trowelling solvent or MEK. The trowelling solvent is usee with a brush and trowel to provide the final smooth slick finish. Allow to dry 12 to 2U hours. d. Carboline 11301-2 (Gray 72li) Polyurethane build coat Wipe down surface of mastic coat with Solcx (denatured alcohol) and brush one coat X1301-2 build coat. This helps to seal pores of mastic and provides a still smoother surface for the final coat. (This step is more for appearance and can be eliminated if desired.) e. Carboline X1301-66 Polyurethane (any color) finish coat This coat should be applied 8 to 1|8 hours after build coat. If more than four days elapse, surface of build coat should be washed down with 3olox before applying final coat. Appendix B (23) NNA 14353 (2d) HNA 14364 Appendix B NOT CELANE5E CORPORATION OF AMERICA ENGINEERING DEPT. . DMQ(S). MTUU\L Biu B0` VK3-OOU8 engineering standard E8-3.1 4 March 7, 1962