Document RpzOaO4DMzJY8pRnGLgOdRp7E
LIMPET SPRAYED INSULATION AT BEAUMONT
The first application of limpet was applied on the Acrylonitrile unit in mid 1961 on a test basis. Probably less than 1,000 lbs. The next application was on a 12" steam line from the power house to the new Nordel plant. This work started in late 1962 or early 1963. All of the hot temperature carbon steel equipment was sprayed with limpet. This work took place in 1963-64. In the mean time we sprayed limpet on equipment in other areas of the plant on small projects and plant work orders. Those that come to mind are 2 Hypalon reactors, 2 Acrylonitrile waste heat boilers, several boiler heads and the dearator at the Power house.
We sprayed limpet on the 16" steam line from the new Ammonia plant to the Power house. The spraying was applied to the pipe in the insulation shop, then carried to the field and erected. Spraying started in April of 1-966 and continued for approximately 1 month. During this period (1961 thru mid 1966). The limpet crew was wearing "Dustfoe 66" respirators. Some time in 1966 we were directed to furnish filtered fresh air to the limpet crew. Also we were directed to do any further spraying of limpet in isolated areas away from other personnel.
The second phase of Nordel started up in late 1967. All equipment that was sprayed with limpet was transported to the west end of the plant to an open area away from other personnel where the limpet and finish were applied.
Limpet was applied on the Nordel equipment until finished during the first quarter of 1967. Sometime late in 1967 we were directed to stop the spraying of limpet. Other alternative sprayed materials were becoming available but we never used them.
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DUP 1008050
REFERRANCES TO LIMPET IN NOTES, LETTER
LIMPET INFORMATION, UPDATE
LETTER - SUBJECT; SPRAYED LIMPET UPDATED, APP 1966
LETTER - 6/17/1965, 6/8/1965
DIARY
LIMPET SUBSTITUTE - ARMASPRAY - 1/7/66, 1/10/66 LIMPET -
3/21/66,3/31/66,7/13/66,7/15/66,7/19/66,105/66,10/6/66, 10/10/66,10/25/66. 4/23/68 - MONOSPRAY AND ARMASPRAY ASBESTOS CONTENT. 5/23/68 - 5/24/68 - MONOSPRAY. 6/3/68 - BANNING OF HOT SPRAY MATERIALS 6/21/68 - SPRAYED MINERAL WOOL
DUp 1008051
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LIMPET INFORMATION
1. Temperature limits (a) L.W. 25 - 200 700 F (b) L.B. 8 - J00 to 1350 F.
2. Density after spraying and drying - 8 to 12 lbs. per cubic foot.
3 Drying - 2k hours at 70 F. 60$ R.H. 4. Cures to 90$ of ultimate strength in seven days.
5. Setting time - 2 to 3 hours depending on temperature humidity. 6. K - Factors - "K" = 0.30; 70 mean temperature; 15 MFH wind; and density of
10.5 lhs. ft. 30 can be as low as 0.23. 7. Expansion and contraction nullified and absorbed by the fibrous nature of the
coating. 8. Combustability - completely Incombustible.
9. Corrosion - inhibits corrosion of steel when used within specified range of temperatures 200 - 1350.
10. General - will not mildew, crack or rot and will not sustain rodents or vermin.
11. L.W. 25 100$ amoslte asbestos fibers.
12. LB. 8 - blend of crocidolite asbestos (soda - iron - magnesium silicate) developed for hi temperature has been applied successfully to a hot face temperature of 1380 F and its temperature limit has not been determined.
13. TS .2 a white resin emulsion which can be added to the spray water in various concentrations, can be over sprayed for surface toughening, or throughout to make the Limpet hard.
14. Air - 5*5 cubic feet per minute. 50 lbs. minimum 15 Water - 4 gallons per minute. 35 lbs. minimnm 16. Electrical - 115 to 230 volt - 60 cycle, single phase A.C. One H.P. motor;
13 amps an 110; 6.5 A on 230. 17. Blower for extra height. Standard height is 40 feet. 18. Weather protection.
(a) Protect from direct rain the first 24 hours. (b) Apply finish when a crust is formed on surface, although Limpet may not
be thoroughly dry.
19. Rental $25/veek - Armstrong Maintenance $28o/year - Du Pont buys hoses and maintains.
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DUP 1008052
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UMPET THICKNESS TO CORRESPONDING DU FOOT CODES FOR BLOCK
DEGREES F 100 1" 200 1" 300 l" 400 1"
500
600 2" 700 2J4" 800 3"
314"
k" Wz
BLOCK 1" 1" 1" l/z
2"
2/4" 3" 314" V*
Wz'
. 5" .
CODE 56
66
76
86
96 106 116 126 136 146 156
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DUP 1008053
DU 051133
:?ray polyupethalt: mil be used on szc speke storage tanks at lcuisville. the -JUIPIUNT WILL 3E SHIPPED THERE. FROM BEAUKOin OH THE lSTH OF NOVEMBER. SSBS TEE J03 'ILL START AROUND THE FIRST OP UECEiEER. R. L. HOOKEY, INSULATION SPECIALIST AT BEAUMONT, WILL GO UP FOR ABOUT THREE DAYS AMD TRAIN THEIR OPERATOR TO USE THE EQUIPMENT. THE BRI2IE STORAGE TANKS ARE 10 FEET III DIAMETER AND 28 FEET LONG KITH
-- /dT DISHED HEAD^ 'ORIGINALLY 4 INCHES OF FOAMGLAS WAS TO BE USED PRIOR TO OUR mKK.-*******,
TO USE SPRAY POLYURETHANE WHICH WILL BE 2 INCHES THICK. THE FOAMGLAS MATERIAL WAS ISTIt'IATED AT 708 PER SQUARE FOOT. THE POLYURETHANE MATERIAL COST SHOULD BE AROUND 308 PER SQUARE FOOT. THE LABOR COST FOR THE SPRAYED POLYURETHANE IS ESTIMATED TO BE iOd PER SQUARE EOOT. THE LABOR FOR FOAMGLAS INSTALLATION COULD BE AS HIGH AS $1.00 PER SQUARE FOOT. IT IS BELIEVED THAT CONSIDERABLE LABOR AND MATERIAL SAVINGS WILL BE MADE, BUT WE WANT TO SEE THE ACTUAL RESULTS AT LOUISVILLE PRIOR TO PREDICTING TIIEIR EXACT SAVINGS.
SUBJECT: SPRAYED LIMPET SPRAYED LIMPED? HAS BEEN APPROVED BY THE OPERATING DEPARTMENT AT BEAUMONT
FOR APPLICATION ON AN 18" STEAM LINE TO BE INSTALLED TO THE NEW AMMONljSK PLANT. THE EXISTING STEAM LINE AT BEAUMONT, WHICH WAS INSULATED ABOUT THREE YEARS AGO WITH LIMPET,WAS EXAMINED BY THE OPERATING DEPARTMENT AND CONSTRUCTION TO DETERMINE ANY CORRISION OR PITTING OF THE STEAM LINE. NO APPARENT DAMAGE WAS SEEN AT THE
TEST PLUGS. THE LIMPET PRICES HAVE BEEN REDUCED FROM 2kj> PER POUND TO 208 EER
POUND. THIS REDUCTION GIVES ADDED IMPETUS TO THE USE OF LIMPET FOR HOT INSULATION ON EQUIPMENT AND LARGE PIPE LINES.
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