Document bBQQJ83yvkZopwamkp8Qqo5ro

KV Ml E. I. ou Pont de Nemours & Company Wilmington. Delaware i989b TEXTILE FIBERS DEPARTMENT CC: R. L. Myles - Camden O. Waldkirch - Cape Fear W. D. Rhodes - Chattanooga G. R. Coulter - Chestnut Run W. M. Reading - Kinston W. J. Maney - Martinsville R. A. Attanasio - Old Hickory F. C. Miner - Seaford C. P. Fisher - Spruance J. C. Jacks - Waynesboro H. Jansen - Uentrop P. E. M. Soons - Dordrecht H. A. Canavan - Maydown December 8, 1971 D. M. ISIMINGER STANDARDS ENGINEER ENGINEERING DEPARTMENT S4T - MEASUREMENT AND CONTROL OF ASBESTOS DUST EXPOSURE Attached are comments from our plants on the proposed subject standard. As you can see, they are numerous and represent some basically different approaches from those proposed in the standard. The Textile Fibers Department has been concerned with this problem for some time now and has done a great deal of work to determine how to adequately control asbestos dust. I am attaching a procedure developed at our Old Hickory Plant for you to use as you see fit. We certainly agree on the need for a standard such as this but, in view of the number and nature of the attached comment^ we do request that their disposition be made known to this office before adoption of the standard. MANUFACTURING DIVISIONS J. A. Sigman Division Engineer WDM/pas A ttach. BETTER THINOS FOR BETTER living . . THROUGH CMIMIT*T DUp M53872 DU 062100 ASHE 3705 E'-'e:1 :;?/ c 0 UP nS38?3 DU 062101 ASZZZ70Z CC'.'.Z ROL s sar.:. ary :c work car. e bv is a cccrailaaicr. Ano'ycical Research Labaratory Cheir.ic-:! Ccr.trcl Laboratory and V.'orhs Zr.gir.eer ir g Zc-ccicn Old Iiichory Ter.aile Libers Old Hide rv . Zenr.os.occ by DUP 1 153874 DU 062102 INTRODUCTICU............................................................................. dzvilopmzut OF OLD HICKORY'S asbestos dust EXPOSURE LIMITS 'TURKSHOLT LIMIT VALUES) . SAXP7.IU0 RRCCEDURE............................................................. SAMPLE DATS.................................................................................... RECOXEL-LDE T1. OAs.................................................................. SUMMAR.Y................................................................................... ACKKO'. ELLD3MEETS ........................................................................ APPEXDUMZS 1 2 4 4 6 11 DUP I 153875 DU 062103 1 I. Intr oductlcr. A. Objectives Reference Letter J. H. Sigman-L. Ccx to R 8/8/68: Letter R. J. Blair to 0 (See Appendix A) Blair, Hess, 2/16/ 68 . 1. Study jobs .-.'here asbestos dust is present, a a he dust samples for analysts and determine wh-.m. respiratory Drotecticr. is recoined. 2. Provide information to the Textile Fibers department that could be used as a guide for. a uniform, safety standard. 3. Recommend mi dust control e emer.ts f er B. Premise 1. Asbestos dust control is the prevention of high concen trations of asbestos dust entering the lung of asbestos hanHl inn nr wo-V' t>c v' rh ssb.f'ms . 2. Asbestos:? is a fibrogcr.ic (scar prcduc:nm.` unoun- conios:s (dust disease of the lung', due !<- . ,.hel= . ... or asoestos finer dust. ir. its more a dv-.no-ad c cage? it can impair respiratoty function vith prod iution ui emphysema . Total dior.b.' '.i ty and death vr-:-ou ' v.. Espeo-r.lly m e, .eue-os there is a marhii ir.our.. a in. inciccr.ce of soT,erol cf c?.r.ci . There is ro reasonable: e to control u J unc. DUP 153876 DU 062104 2 II. Devel comer. ~ (Threshold Limit ''aiuesi Asrss.:s Dust Exposure Limit; f) *t) In April 1C.G3, the Engineering Dcpertinent1 s Construction Division established procedures for monitoring air using personnel sir sampling instruments (see Appendix 3). Sam. were then sens to the University of Pittsburgh for micros analysis by qualified experts. The Construction Division's established Threshold Limit Value (TLV, cor xtsi oust count at inis time v/as set at S . .Cv particle? per cubic foot of This was 1/10 the fL7 set for industry. Old Eichory of ashes studies: is Committee r.as reseurcuec cr.e subject has cor.cludsd from their o A.sbestoc dust consisted of grains and fibers ^ . The fibers are the major recognized health hazard. 9 Large dust grains canr.ct enter the lungs but medical studies show that long fibers (as long as 200 microns'-^) do enter the xUiig anct cause asbestoses. c* Prior to 10GC, exposure measurements vers based on particle: counting methods vr.ich ware not efficient Or * OCV C'VM't. . TH 0 * r * 2 j" ' v.' , u r ^ H " cr TLV had been set for dust concentrations which '-.or ; measured primarily by grain count. o Ir. the late lOfC's. new sample and count techniques were developed vdiich provided much improuemcr. in tbs accuracy and efficiency c::m. mg t-i? estos dust grains and fibers This method was par ei.receive- m the finer sizes of most co 5 micro:..! and creator. (1 KI-i:n, er is : size .i. 12), ______ . -------- c. DUP 1153877 DU 062105 3 Studies since chat tine led the American Conference of Governmental Industrial Hvnier.ists in 1955 to adcot. as an "intent to change vi', 11 a TLV of 12 fibers greater than 5 microns in length per milliliter cf air '12 fibers/ml ^ 5 ) or 2 million particles per cubic foot of air (2 I'.PPCF), instead of the present TLV cf i MPPCF (see Appendix C) . The 12 fifcers/-i 5 TLV is based on the r.ev membrane filter samole method; whereas, the impir.ger sample method. o 3oth the ACGIII and the Div: :n cf occupational Department of Health, Iduuatior.. and Welfare-, agree the fiber count method will, in all probability., replace particulate measurement for exposure to asbestos dust and v.'ill be in the TLV "Recommended" category m 1970. The Construction Division's TLV and the Departmental ccal of 500,000 *J?C1' actually applies to overall dust: ness a;' measured bv the imoincer method and :s not me.anrngiui men tuc sample is taxon og c : * - a.'u j >*. s. - m OmV -- _...v,..,** ...y. ............ .... ----------- - v-- ------------ * e* r- - c. p e- : method of mu.=.surcm.cnc to date and justifie; continued use. Daicd or. thes^ f. indirgs ant the fact thaw :.'.?:r.br ant 3?."rpj.ir.g vas ceing usoc *. ^ : ^p3 I'TT'>' cl-;-"--*-'TTr Conor.: acreto c;:?.r/:'c door* ire >?rirr. pper to 12 f ihers/r?.l 5 ir. lo: :n ; i. -I ft - - l. r. . short icrr. exposut2 'c?:\g hcor or 5 y*-* t r* 1 g rj c t h o " o if ' * -1' This is 1/2 the ACGIH prop:red : or eigne r.cJi '. 1 ^' W e f e 2 goals cf 2 2 and 5 offer as much or mere pretc eti oricur.;:! TLV expresi .1 in particlce. Add` i:.r.s 11 u r 1 ".u ourselves in cl.c direct-or. in ic'n v a aebc.: . j ,,. i- or stuuv shai ' cumin ue to tr,, mm.v.n cuav th - me use." stud.es l\ ~ .n DUP 1153878 ' rticc DU 062106 4 In the following sample fata. Old Hickory used the TLV s for long and short, term exposure defined above for specify ing when respiratory protection is required. III. Sam.olir.c Procedure Sampling at Old Hickory was dons with an MSA portable pump Mo. 92814, with Millipore Filter Assembly Mo. MAWG037.-O and Aerosol Adaptor Ko. ::X62CCC04. All samples were sent to: Dr. Morton Corn Attention: Felix Stein Department of Occupational Health Ur.iverstty of Pittsburgh Pittsburgh. Pennsylvania, 15213 Dr. Corn is a qualified expert in the field for microscopy analysis. See Appendix D for actual procedures. Jn a poricd, May through August, 43 samples were taken and analyzed (See Appendix E) . Of the 43, 36 were jobs; 7 ..ere sampled at vents. Fifteen of the 36 were out of limits. Four of the 15 "out of limits" were taken while machine sawing " Ur.ibestor.." There were three short term samples and Oiic. xOi'ju ucrr.\. Of the ii remaining samples, 6 were less than one hour and' 5 ware greater than six hours. Following are data of the 15 samples that exceeded T1`.'1 s. DUP 1 153879 DU 062107 3- dust sampling Zu.ci?.o:::c- riv's Instar. laneous or short term (or.c hour or less) > 5 --*< length. Long term (eight hour average) > 5 -'** length. Duration Fiber/ Sample Location and of ML > 5 No. Activitv Sarr.Dle - 12 fibers /ML.. - 6 fibers/."!, Remarks Grout 1 25 Central Shoos _ 20 min. ^ "tH'Voc e 11 23 Central Shops 5 min. Sawing " Ur. ibe s t-CS " All S9 Sav.-inc of "Unibcstor" : All sarnies rroduced fiber counts greatly exceeding TLV's. 30 Central Shots 10 min. Sawing "t'nibes _ w _ ^ _ 11 32 Reemay* Shot - 1 hr. Sawing "Unites X. II 4 min. and "Kaylo" 759 249 Grout i 24 Central Shoos Sawing 4 Dacron'-' Shops O C. * . w1 .. TM .r c. Ruberoid-LK 5 Dacron^' Shots Sawing & Pcuri Ground .'.sb-sto s 10 min. 15 min. 13 min.. 38 Sawir.c of Insul-tirn: Specific brand:, of insulation net known. 27 All short term i:bcr counts c::cc-:d TLV by considerable amount. The long tun:-. sc...;.l; 38 =42 only slich.tly exceeds T7V. 42 Dacron- Shots Sav/i.ng "Kayio' 7 hr. 30 min. .8 19 DMT Shop Sawing 15 min. 925 25 sh- Sr.-.. 10 "7 3 C i. ^ .. .. DU 062108 I _> : ` ' - ' C. .. - . rV ODUOPP "l S1533888800 6 DUST sa:u?i:i:g e:-:c ' s iConi' d) Sample No. Grouc 3 Locat ion and Act 2. V 2. "ZV Durauicn of Sam le Fiter/ y.L > 5 Remarks 39 Central Shops - 7 hr. Routine i OT.T-. --1- 7 Routine iLor.c Term) : Work includes all :v:e= 4C S' C'~. i/G S_ _ w. . _ 5 hr. of jobs from sawing to 13 cleaning. Som^ read- Routine Work 4 min. ings are slightly 41 Dacron^ c;-,q-, - 6 hr. greater than two iim.es 8 the TLV but do r.oi Routine r`t cr.\ ID min. approach the levels of the short iarm. jobs. 42 Pover H aintc-ra r.co 5 hr. 13 Rout i. r.e "Cork 50 min. V . Recc--.-er.da t ior.s o. o Based or. C3d Hickory's study of the asbestos dust and analysis or the sample data, the following reo Lio.is arc rer r. e - 1 The Engineering Standards should specify the c-xclr.sicr. of insniailcn materials containing Crocidciutc lyue asbestos. 2 Use of Unibestcs be discontinued and romov Engineering Department Standards. tr.c 3 S cTiC 1 OS ~ C 4" C.*t C~ U ^ ^ 0 G L' L 1. of impincer type samplers) at several plan 4 Torit Huso Collector, Series IS (or equal) sr.ou. specified for use on ail power saws used f {Consider including in Engineer" r.g Scaudar ) All sho 0 qj C lo cj v?ivjr-i systcr.s use .u; c i.. x prraced to higr.e t c leakage. Speci 1 a tor. t.\ cz (i). I se r. l ' - ` r . ': DU 062109 DUP 1 15388 I 7 6. Torif Down Draft Benches (or equal) should he scarified for use or. procuctacn type insulation shoos 'where severe dusting occurs from. shaping, cutting or hanf.sav.unc asbestos. (OMZ S1.5M-S2M). (Consider including on Engineering Standards.) 7. Approved vacuum cleaners shall he used for flocrs, ecuipment, etc., whenever practical. (Investigation is continu ing to find vacuum cleaners that will entrap particle sizes 5 microns and greater efficiently.) Goal is to reduce fiber content of the exhaust air. Q VJ Ca*n4v* 1 2 3 4 a. Mineral dust resoirators actroved under U. S. Bureau ti).O- Mix.es cCiicttj.c ^_3 , occ for the following gobs m --v (1) All sawing cf "Unibestos" until this product is discontinued. (2) Touring Qf ground asbestos in all cases. Examples: filling storage bins, dumping into mix pails, etc. (3) Tearing off asbestos insulation from pipelines, ccuicrncr., vessels, (4) A:ry operation involving cleaning cr removing cr asbestos dust or residue in .hich an approved vacuum cleaner is not used. fC \ ^ -* / aSDeSuCS :ust 1 -- b. An approved vacuum, clearer shall be use asbestos dust when cleaning floors, ecu wherever practical, v.'hcro impractical, dust mash, shall ho worn. e c. On power equipment provided with dust removal sycte.-.s. turn systems on hair.re . erk; ng cr. asbestos materials. Turn systems off only after completing worm.. DU 062110 HUP 1 153882 8 9. Procedures All insulation shops must be properly ventilated and saws equipped with high efficiency cyclone type cr fabric filter type dust collectors. In order to assure cxpedier. and efficient dust removal, the following shall be in 6 sc t a. Specific Safety Rules shall apply. b. Equipment and shops shall be inspected once per month to assure systems are being maintained and are operating properly. (This inspection shall bo on the IBM monthly reminder.) Specific items to be checked are: (1) Dust collector fans operating. (2) Seals around ducts are tight to assure adequate velocity and volume of air. (3) All duct joints are tight. (4) Dust collection containers shall have plastic bags inserted to eliminate need ror shoveling, sweeping, dumping, etc. Bags should r.ct be allowed fn fil] more than 1/2 to 2/3 full to wiicv: for tyinc* tr.9 bacs noon rcr.ovci to prevent dusting condition. (5) Under normal use cf sav;s (average one hour sav ing per day), the cloth exhaust filter bags shoul be agitated (shaken and beaten) each week, and cleaned each six months. (6) To clean exhaust filter bags, a large plastic beg should be placed ever the filter bag and tied at the top. Then, with the far; cf f, agitate the fil bag vigorously by beating ar.d shaking to looser, the dust particles from, inside and outside the filter baa. Plastic hag must then be removed. tied and disposed cr. Dust inside the filtor big will settle to the bottom. These bags car. be used r.dcf in j tel'/ by i'.*cocr.'' y cleaning' but : t is r occ~ m on d d th uni:, and after t too nor- - u s <:. DU 062111 DUP 1153883 9 (7) Ducts shall be checked by use cf flashlight :: other means to assure they are r.ot plugged. (0) Room exhausts and wall fans shall be checked feu proper rotation of fan and to assure guards or grids are not blocked with trash. (9) Exhausts and vents shall be checked periodically to assure they are exhausting into unoccupied areas. c. Approved dust masks shall be used as specified in d. Personnel should be thoroughly trained in how to properly fit the masks or respirators to the face as per the manufacturer's recommendations. Responsibility - It is the responsibility of the area supervisor in 'chose, area dust collection systems are located to see that they are inspected and recorded on TP" cards according to this procedure. SUMMARY Old Hickory has attempted tc pool present kncvlcdgc of the dust problem with the information obtained from. cn-,,lana Hrr.'t 1 ir.'T tc d.c c ^ rifv t.r.2 c.Lz Jcircr.ccs 'z 2Z'.. r-r. level identification - MPPCI' and fibers/ML; (2) determine realistic T bV r 3 identify dobs and m.hteria.s exceeding Tl'.'; ; 4; red .mu exposure by specifying equipment modifications or additions, changes in job procedures and use cf suitable respirators ..here levels cannot be lov/ered sufficiently. The recommendations contained in this ronert are based cu analysis of the problems imposed on the only qrouya of t'_ctl_- ; n the Old hickory plant site routinely exposed to asbestos r'v.sa the r a;- a insulators. Other job cl asses and ether giant sates ~;.y have rnrtaeuier orobltms which etc bc-vono Old "ickorv' a cuu.tifer: t i: DU 062112 t,OOP 53684 10 Asbestos dust hazards can obviously be greatly minimized by controlling exposure concentrations to safe levels. Old Hickory selection of a safe level is equivalent to 20% of the present recognized industry standard. Further, it is believed that the best way to obtain this level is to control it at the source, thereby reducing the instances where respirators are needed. l>Up ',S3&8s DU 062113 11 ac k: : owls 3 cmi ::t s The assistance of the following individuals is gratefully acknowledged. C. D. Crook Analytical Research Laboratory Old Hickory E. J. Klocjb Bureau of Mmes_. U.S. Department of Interior Pittsburgh, Pennsylvania J. R. Lynch Bureau cf Occupational Safety & Health U.S. Department cf H.I.W. Cincinnati, Ohio H. D. Murray, M.D. Medical Supervisor Old Hickory V. E. Rose Secretary of American Conference of Governmental Industrial Hygienists Cincinnati, Ohio j* r. C-* f'V iJj.u ron VO 1 * -- -- - w* "" ^ j T T-V-s/-.- --t.-^ Fell;. Stein Dspartr'.er.t cf Occur attune 1 Her'uh University of Pittsburgh Pittsburgh, Pennsylvania j'. J. Tracey Du Pont ue Nemours (Deutschland) GMBH We rk Ucntrop Hamm, West Germar.v DU 062114 Dup