Document ExGzGROZqmRr69gyagyDnYaJN

THE row CHEMICAL COMPANY Texas Division GENERAL PLANT STANDARDS < INSULATION SPEC. 8-627 Dated 12-14-62 Page 1 of 5 INSULATION FOR PERSONNEL PROTECTION PIPE AND FITTINGS 1. Insulation Material I.I Pipe Hie insulation material for piping shall be one, or more, of the fo!loving, or Dew-approved equal: 1.1.1 "Hinged" type sectional fiber glass insulation, 3 foot or 6 foot lengths, suitable for continuous service at 350 F., such a3: Guatin-Bacon Snap-On, Johns-Manville Micro-Lok, or Carey Thermoglas; > For Class G-P only. From llKTF. to 350 F. Note: Plain fiber glass pipe insulation, or insulation with factory applied Jacket may be used. See Sections 4 and 5 for type of Jacket required. 1.1.2 1.1.3 Mineral wool industrial pipe insulation, standard > lengths, fabricated to fit pipe, such as: For Classes Baldwin-Ehret-Hill #101 pipe Insulation, or C-P, D-P, SE-P, F-P, Carey mineral wool industrial pipe insula and G-P. tion; or From l!*0F. to 1000 F. Insulating materials specified in Dow Standard | 8-601, page 3, may be used. J 1.2 Pipe Flttlnga and Valves Note: The insulation shall be omitted from all valves and all flanges for Class G-P insulation. The Insulation material for pipe fittings and valves shall be the same material specified for piping or the material specified for vessels and equipment (See Dow Standard 8-647) z z in e s Q is All in/crmfl/ton hereon is the confidential property ofThe Dour Chemical Compmry, Texas Division. Sukiect to retien on demand and must not he made titJiltr re umhr*4tr umtten mntmmml. 2. Insulation Thickness SPEC. 8-627 Page 2 of 5 ) cn !3 |c-p i 1 | D-P Temperature NOMINAL Equipment 1." aid. Under 23 1000P. to 8oof. ?" 800F. to 700OF. 1" INSULATION THICKNESS and 4 5 6 8 10 12 14 16 18 20 24 Elat Surf 3" 2 2" |b-p . 700P. to 6oof. i ; f-p 6oof. to 350F. ic-p 1 350F. to i4of. t_' 1 ' SOKES: 1` 3A' i - In ~2 1" 1. 2" 1" 1" 1. For temperatures 800F. and. over, insulation shall he applied in double-layer construction with staggered joints, or in single-layer construction with Dowapproved expansion joints. 2. For temperatures 350 to 800P. (Class D-P, E-P, and F-P) insulation shall he applied in single-layer construction with Dow-approved expansion joints. ST0534U23 3 General Plant Standards Insulation Spec. 8-627 n&tea 12-lU-~62 Page 3 of 5 3. Application 3.1 Pipe 3*1.1 Fiber Glass, Plain All end joints shall he tightly butted and the single longi tudinal seam shall be held together with- copper clad outward clinch insulation staples, 4 staples per 3-foot section. No bands are required except over asbestos felt Jacket. See Section 5* 3.1.2 Fiber Glass with 6-ounce Canvas Jacket Apply the same as plain fiber glass. Paste down all canvas laps with white adhesive such as Foster's Lagfas 81-42W, Airbol, or Dow-approved equal. 3.1.3 Fiber Glass with 55-pound Asbestos Jacket, White Exterior Apply the same as plain fiber glass. Seal asbestos laps with asphalt seam sealer. Apply bands over the asbestos jacket as specified in Section 5. 3.1.4 Mineral Wool Butt end joints. Secure longitudinal seams with lead wires furnished with the insulation, or with. Ifi gage 302 or 304 stain . less steel wireB on 9" centers. 3.2 Fittings, Valves, and Flanges 3.2.1 The insulation shall he stopped short of all flanges and valves on Class G-P insulation. The ends of the insulation shall be beveled to permit removal of the flange bolts. Flanges and valves with insulation hotter than Class G-P shall be insulated. 3.2.2 The insulation for fittings and the body of valves (when insulated) on pipe 2" and smaller shall consist of a built-up layer of insulating cement or other material suitable for the temperatures involved. Total thickness of insulation to equal that on adjoining pipe. - 3.2.3 Fittings on piping 2 l/2" and larger and the bodies of the flanged valves (when insulated) shall be insulated with blanket or sectional insulation to a thickness equal to that on adjacent piping. 3.2.4 Flanges (when insulated) shall be covered with sectional pipe or blanket insulation to a thickness equal to that of the insulation on the adjacent piping. ' 3.2.5 The insulation on the body of 2 l/2" and larger fittings and valves and on all flanges shall be securely wired or banded in AH information hereon is the confidential property o{The Dout Chrmrml Company, Stihtet't fn return nn - T -- * 1-- -- -- - -- Division* SPEC. 8-627 Page 4 of 5 place. On flanges, the Insulation shall he of such length as to extend not less than 2" or a distance equal to the insulation thickness, whichever is greater, over the adjacent pipe insulation on each side of the flange. The total thickness cf the insulation shall he equal to that on the adjacent piping. 33 Bends 3.3.1 Bends shall be covered by mitering sectional insulation, or by using blanket insulation. 4. Finish Indoor 4.1 Pipe 4.1.1 The finish for pipes indoors in all areas, except in production plants, shall be 6-ounce white canvas lapped at least 2" at all joints and pasted over the insulation with white adhesive such as Foster's Lagfaa 81-42W, Airbol, or Dow-approved equal. After the canvas is in place, apply a full coat of white adhesive. Pipe furnished with 6-ounce canvas jacket will require sealing of the seams (See Section 3*1-2), followed by one full coat of ' white adhesive, Foster's 81-42W, Airbol, or Dow-approved equal. 4.2 Flttingr, Valves, Flanges, and Bends 4.2.1 These items shall be finished with a two-coat application cf a white FVA. resin emulsion; such as Foster's 31-99 Sealfaa Mastic car Dow-approved equal; reinforced with a layer of open-weave glass cloth. Lap all edges at least 2". All voids and pinholes must be covered, leaving a smooth, neat finish. 5* Finish Outdoor 5.1 Pipe 5.1.1 All piping outdoor, or otherwise exposed to the weather, shall be finished with a waterproof jacket of asbestos roofing felt, white one side, tightly wrapped on, with a cold seal of adhesive applied evenly over the entire surface of all lap joints. The weight of asbestos felt shall be 50 to 55 pounds/lOO square foot. All joints shall be lapped as follows: Insulated Outside Diameter Minimum Joint lap Less than 8" 8" and larger 2" 3" On horizontal pipes, the seams of the waterproof Jacket shall be placed at the side of the pipe with the lap turned down in order to shed water. Secure waterproof jackets with 302 or 304 stainless steel bands spaced a maximum of 10" from center to center of bands, with one ST0534425 ) General Plant Standards Insulation Spec. 8-627 Dated 12-14--62 Pag- 5 of 5 band not more than 3" from the end of each Jacket. Bands shall be 3/8" wide by .015" thick for all sizes of pipe. 5.2 Fittings, Valves, Flanges and Bends 5-2.1 Finish the same as indoor. See Section 4-.2. 6. References 6.1 Dow Standards: Standard No. Title 8-64-7 Insulation of Personnel Protection - Vessels and Equipment. \ 9 Z *i*ie s o is All injorrrmtion hereon 11 the confidential property ofThe Dow Chemical Carnymiy, Texas Dtvistoru Ci,4#er /ew wA ' GENERAL PLANT STAND ii. .; : pi.',;, . ! > ` M: : <' tNSULATJON SPEC. 8-72 REV. A Dm-.! ' ;i-&? P**e 1 of l njf "?? -- 3 75 j a ' --T X VX* </* O2 <= _ - rHr iil f| V1 \/ . * . ' * * -i -* > f/ 5O m2 / . rF *2 H> OX > om n -< x s 2n -r. *,,T i) -/,* 3- 3* -!> .v" *< --i 7> - T? a* 2 ^3 ^ 'f Z W 6 < i oS w * j r < J5 " J? ; p 3* *e ft* 03 1 O ^g 2* ^ft ?T * < 31i (/i *i *> Oft *jorn ;f* sr yc *a* V :3* -r* 2 -s ; 9* <1 o q 5. AA n z -Tt z ? *n iC csi tzj oz r m. 5*0 5z z|zi 2 > o*zm H EST00000 I9 R. C. Middleton 10/26/64 The question .concerning asbestosis had to do with sawing Tranaite. Although the dust from such an operation will probably contain respirable particles of asbestos it is highly unlikely that enough exposure would exist in the use of Tranaite to represent a real hazard. . It wa3 explained to the men that in using the epoxy resins it i3 necessary that contact with the skin does not occur. We explained that the seriousness of the rash stems from the fact that exposures which appear to be acceptable can result in sensitization and that once a person is sensitized he can no longer work With the epoxies. We explained that the plant air was free of carbon monoxide and mercury and explained our plan for checking the air for oil mist and other particulate material. There was some discussion concernling the use of an oil trap in the air line. The equipment used in Midland was shown. The men reported that those who had been involved in sand blasting equlpmert in the Catalyst Plant had been plagued with rashes which they associated with nickel salts. We stated that there is such.a thing as dermatitis due to nickel and that surely the appearance ' of rashes associated with such contact indicated the need for.keeping the material off the skin and for removing it if any contact should occur. I hope you will forgive the tardiness of this report. My only ex cuse is that entirely too many demands have been placed on my time since last I saw you. . Rest personal regards, H. R. Hoyle Biochemical Research laboratory 1701 Building HRH:reh Enc - .i " P i i i I , nISi OFFICE COPY Biochemical Research Laboratory The Dow Chemical Company EXPOSURE TO PINE DUSTS ENCOUNTERED BY WORKERS CUTTING VARIOUS TYPES OP PIPE COVERING MATERIAL Pile: Date: By: OO T2.l-3-l July 21, 1965 E. J. Schneider Signed ^^ ---------- 7?---------------------------- Checked Date 7/23- A S Date 7- DOW CONFIDENTIAL PROBLEM I A question was raised by shop personnel after reading an article of the health hazards associated with exposure to asbestos. L Is there a health hazard from asbestos in cutting various types of ri pipe covering material used at Dow Corning? The Environmental Research Laboratory was asked to evaluate the exposures to the i fine dusts encountered by workers cutting the pipe covering material and to determine tne possible health hazard. l CONCLUSIONS l 1. Concentrations of total dust in excess of acceptable levels ( can be encountered by workers cutting pipe covering material both by nand and in using a table 3aw. 2. A total du3t count or the number of particles per million cubic feet of air also exceeds acceptable levels at times. 3. The amount of asbestos fibers of significant length found within the dust exceeds 25 per cent cf the fiber content, DAK 01161 Orrmn r *-rr'C'T1 r* * i- u r\ -.. -- r> r-v r.r 1 Y . Biochemical Research Laboratory T2.1-3-1 Page 2 however, fibers constitute only 10 per cent of the total i dust. The possibility that Dow Corning workers are being exposed to excessive amounts of asbestos fibers within the important fiber lengths (20-50 microns) i3 unlikely, hovever, it is advisable and prudent to have workers wear respiratory protection while cutting pipe covering material. This is especially true when using a table saw. 4. No one type of pipe covering material was found to have a significantly greater amount of asbestos fibers than the others. The Phillip Carey Pibercel material does produce considerable more fine dust than the others when cut. S IU U U U bby ASBESTOS In reviewing the literature^ it is learned that the moat common form of asbestos, is known as chrysotile, a hydrous magnesium silicate containing from 12.5 to 14 per cent water of crystallization. There is another form of asbestos derived from amphibole which occurs as a variety of minerals consisting of iron, calcium and magnesium silicates with little water of con stitution. This latter type of asbestos consists of shorter fibers but i3 more 3table chemically than chrysotile and more resistant to acids and heat. DAK 01162