Document rebXxMN0Bdy8VGaEkjX97eqar

4-tO tf **CC Y***) Monsanto c MO* |NAM| l lOCADON) DATt UAXCT wwNa TO B. J. Sanders - Texas City (3R-16) August 31, 1984 Non-asbestos Packing S Gaskets P. K. Hanson11.' . ',. ^ Regional Purchasing . R. M. Gibbs R. L. Harrmond D. A. HardinF. E. Rouse R. V, Sharps Confirming our telephone conversation of 8/30/84, please review the attached memo from CED concerning use of non-asbestos gaskets and packing. Note the January 1, 1985 target date^to stop purchasing asbestos-containing gaskets. Dorothy Hardin and'I are gathering Information frcm various suppliers to ' determine availability, cost, chemical resistance, etc. of non-asbestos products. - : -t 'F." r'-.ir.L _ t - If you have any more ccmnents-please let us know. We will keep you posted on our findings.'''--' ^- c ............... 5-- l.B, J. Sanders /sm . . . / "Attachments - r : r.; r: ' r . ; JV - - c 6113 23620 'From: Donald R. Fr ..ken CS7H Corpora..- Engineering (4-6744) Date August 2Q ,""-1*984,7";* .............. ' " ' `"`'`''Re: Use of As b es to7s'"`rnping~Sy stefiis u r'cc'^cHarTie PetxT"-"''CS7H Tpm~,-Pryor - CS7H Dave Allman.. ... --1720 Andy Larson -- CS7E Gene Anthony - CS7E Walter Leong _ - 1760 Larry Baer CS6M - Tom-Martin - - -- CS6G Dave Barrett - CS7H-------- Lynn Meenen CS 6M Paul Bernache - - CS7V .. Charlie PannettT t CS6D Jim Blankenship - CS6B - ,,.Joe Purvis. - , -- CS7V A. D. Book . :l--;1560 ___ ____ ...Wendy Purvis..^.-... - -E4WB Jim -Borgmeyer - CS7V Rich Quinlisk -- CS6B Len Bornemann - 1440 Rich Ramsey -- CS6G Bruce Bradley-- , s,,-S6M .Doug Rogel -- 1900 Paul Brewer . - Glenn Ross -- 1780 George Butler . - 1200 i ... .Jack Roubidoux. - CS6M M. R. Bynum - 1760 _c... .. ..Dennis Sages .. - CS70 Bob Carlton . - CS-7D. - - -B.. J.,1 Sanders - 11890' Mike Combs ", i6.9u: ; 7. rBuddy" Satierly71 -CS7E Mac Feld ...- CS 6G. . - Mark Schoedel-... --. CY.: 7 Gene Forneris - -1740 . . ...Gene Stecher -- CS70 Barry Hauf - CS6B G'us Theodore -- CS6B Dave George CS70 Ralph Tisher CS70 Lee James' ~jr C.S6M A1'Tung ; -- CS2B Joe Jeter ; >. xxso: -i;.. Don White -- 1560 Tom Jordan -TB70 . Bill Womack ' 1850 - - *c - For those of you Who haven't seen it,"I have attached a copy_.of Monsanto's policy on the/use of asbestos. As you probably., know, most of the asbestos we use irf new facll/rties is,.in piping systems. I developed a proposal for implementation";of this policy on CED projects as' shown below. The proposal was'approved this'morning.' PLAN FOR ELIMINATING ASBESTOS-IN NEW PIPING SYSTEMS Line Gaskets - ` - - 1. Revise piping system masterspecs (PSM's) . (I revised the electronic version this morning. Any PSS's developed using the automated system will not have asbestos containing1gaskets.) 2. Revise piping system specifications (PSS'"s) "for current projects before January. 3. Stop purchasing gasketing which contains asbestos on January 1, 1985, even if the requisition specifies asbestos. 6113 23621 Coated and Wrapped Pipe 1. Revise piping system masterspecs (PSM's). (i revised the to: ^electronic version . this morning. Any PSS' s ^developed usinq.the,; automated system will not have coated and wrapped pipe.) " 2. Revise piping system specifications (PSS's) for current projects' 3. Stop purchasing coated and wrapped pipe on January 1, 1985. Valves 1^ Revise valve specifications before December, 1985. 2. Stop purchasing valves which contain asbestos on January 1, 1986, even if the requisition specifies otherwise. RECOMMENDED ALTERNATES TO ASBESTOS There is no universal substitute for asbestos. There are generally three materials which have been demonstrated to be suitable: * Asbestos substitutes J . .- * Reinforced PTFE * Flexible Graphite For line'gasYets, the primary alternates are compressed non-asbestos sheet, reinforced PTFE and reinforced flexible graphite (vendor information attached). For utilities such as air, water, inert gas and steam, I recommend using Garlock Blue-Gard style 3400. Unless this, or another asbestos substitute has been demonstrated to be suitable in a chemical service, I recommend using the reinforced PTFE for temperatures below 400 F. For temperatures from 400 F to 500 F, flexible graphite should be used in chemical service. Flexible graphite filled spiralwound gaskets should be substituted for asbestos filled spiralwound gaskets. I cannot recommend PTFE filled spiralwound gaskets because of reported leakage at moderate temperatures, presumably caused >y creep. I understand the industry is gaining favor .for reinforced PTFE filled spiralwound gaskets, but I know of ho Monsanto experience with this gasket. .................... . ... For coated and wrapped pipe, the primary alternates are extruded polyethylene coating and coal tar epoxy coating (K1.3 STD U2). .The primary alternates for valve gaskets are the same as for line gaskets. The primary alternates for valve packing are asbestos substitutes, PTFE and flexible graphite. For specific applications, I recommend consulting with your friendly Materials Engineer. Don Frikken 6113 23622 MONSANTO'S POLICY ON AS5ESTOS Pol icy'/Statement Monsanto's social responsibility policy states that we will provide a safe and healthful workplace for our employes. To support this policy we will ensure that appropriate safety procedures and health considerations are incorporated into the design of all new Monsanto facilities and we will train employes in the safe operat ing practices and require the use of proper protective . , devices. '-To-support this policy a program for the identification and elimination of asbestos materials within our workplaces will be developed. Scope To implement the policy regarding the identification and elimination-of asbestos materials we will: 1 -`Revise the specifications in the CED piping standards to eliminate a.sbestos gaskets. Situations in which rnon-asbestas"gaskets will not meet the specific requirements will be handled by the operating company and CED on an exception basis. 2. -Specify non-asbestos materials for valve packing and other speciality applications. This will require a transition:'period to inform all of our suppliers well ahead of time that we will no longer accept materials obtaining asbestos, to evaluate the cost and performance of alternatives for asbestos, and to change the Monsanto specifications. Situations in : _ which non-asbestos materials will not meet the specific requirements will be handled'by the- - operating company and CED on an exception basis. The target date for completion is December 31, 1985. 3. Replace asbestos in existing facilities with non-asbestos materials when repair, replacement, modification projects or executed. Situations in which non-asbestos materials will not meet the specific requirements will be handled by the operat ing company and CED on an exception basis. A. Manage in a manner to assure proper protection of personnel those situations in which asbestos remains by: a) providing workplace guidelines that reflect the state of technology today and that comply with all governmental regulations on handling, working with, and disposal of asbestos. ------ ------------------ 62H33623, Gasket loading vs. leakage pressures The prime requirement for satisfactory sealing with "Grafoil" metal-inserted gaskets is suffi cient unit load on the gasket at all times in one continuous path around the gasket. If surfaces are maintained flat within 0.005 inches, and are held to a surface finish of 125 RMS or better, "Grafoil" gaskets will seal hydrostatic pressures as shown on the graph above, "Leak Pressure vs. Gasket Unit Load for 'Grafoil' Gaskets." A Net Load of 7,000 psi of dotted line example will seal up 3,150 psi water pressure. The Net Unit Load is that force still exerted on the gasket surface after all the forces which tend to relieve the initial unit load are subtracted. One such opposing force is the "piston" action of the sealed pressure on the area within the gasket I.D. Others are: bolt stretch, piping stress, and differential thermal expansion. The initial load on "Grafoil" gaskets must be enough to end up, under operating conditions, at c Load indicated on the grat 6113 23624 iWWMlMlWHii 'llliMi :IMli,aii3ttlsaSIliitgigt,i.; i i!jBIiBMiiaiiP taw#BjiifiiigssiBiSiWMMBW=WMffliIiKasg|ilSHHi .) "GRAFOIL" METAL-INSERTED GASKETS PIPE-SIZE GASKET* DIMENSIONS C LC- * Normally available from stock. - j; c HOW TO INSTALL -J Remove all projecting particles, scale, and burrs from the ^ m-flange faces. Small subsurface defects will cause no trouble. ^ O ; Part Ganges enough to slide gasket in place, using a few bolts for positioning. Temporary spaces may be advisable. r *5 . .Handle the "Grafoil" gasket with reasonable care to avoid - tearing, scratching or bunging. HOWTO ORDER CUSTOM SIZES c Insert rest of bolts. Draw flanges together evenly. Tighten ail nuts hand tight. Increase bolt loading in usual manner :-r -'?=-:"y7untii required bolt load is obtained. See separate Catalog Section** for pricing and standard packaging. On order, specify size, quantity, catalog number and price. Gaskets with dimensions varying from those shown in the table, can be supplied upon request -- please furnish sketch and dimensional data. G-8819 GRAFOIL it r*git*r*d trad* mark of Union Carbid* Corporation. c UNION CARBIDE CORPORATION CARBON PRODUCTS DIVISION 6113 23625 SALES OFFICE: 120 SOUTH RIVERSIDE PLAZA, CHICAGO, ILLINOIS 60606 TELEPHONE: (312) 454-2000 EXPORT: CARBON PROOUCTS OIVISION. EXPORT SALES OFFICE nn po* avf NFW vnoK n v <noi7 C