Document e7G485oKzeddj26K771gDVRBE

'c_y (y'y(f") r u rp> ^ -<i> rm/j rr . oMl(* tt Bf!)* it o ft M Ml PEA*L t'ARROR NAVAL SHIPYARD Pearl Harbor, Hawaii Ser 78-14 Code 185.6 INDUSTRIAL YniEHE INVESTIGATION SHEET SHOP 38 Simulated basket Cutting Operation DATE: 16 May 1978 REPORT HATE: 17 Mnv 1978 INVESTIGATOR: ...1 Kim Koyamatsu REFERENCES: fa) U.S. nept. of hew. Criteria nocument for Asbestos HAH ^-2-10267.. ~62fi0:i . Control ofAsbestos v'a <. * fe) vI*'*E1RxUpMoEnsuIrter'vto*UNMaEvanl-5P53e3rsoTnInERe:l and to Enyl pas, 8260.4A of T'Marc^W) fd) rederal Register, Occupational Safetv and Health Standa 39, *!o. 125, Part TI, 27 June 1974. PROBLEM: To determine the airborne asbestos concentration as a result simulated gasket cutting and asbestos material handling operatior investigation was ordered by Timmy Choy Code 140, as a result of walk-through asbestos survey of SHOP 38 on 16 May 1978. OPERATION: Nearly all the Shop 38 employees make gaskets out of asbestos material fconsako). According to Gideon Kaonohi, 038-11409, General Forems n, they make gaskets as needed, sometimes aboard ship. The following ast e stos materials are used: -v* Inscription Manufacturer F.S.N. 1/32" sheet Garlock 5330005859 : 02 1/16" or 3/32" sheet Garlock 5330002222$ 63 taa x Z"' Description Mannfac turer rqv 1/8" sheet 1/16" sheet 1/8" sheet woven asbestos {- rubber w/wire Insert Garlock Nicolet Ind. Fed Spec. HHP31 type 2 5330009424728 533D0O58595D 533000268988* valve packing (used on shafts) John Crane (local purchfse) The average maximum time that a worker will spend per day makirg gaskets is one-half hour. When a large number of gaskets is needed^ employee is assigned the job which may take 45-60 minutes. The worlfle use tinsnips, aviation shears or a variable size gasket cutter to the gaskets. Then they use a metal template and hatrmer to punch ou' holes. When it is inconvenient to obtain these Cools, they may use valve itself as a template and create a gasket by placing the consal r the valve and hampering at the edges. Because hammering out a gasket messy and produces a low quality gasket, this rarely is done. The employees also handle asbestos valve packing: cutting it with a she.it fitting it around shafts. Sometimes they hammer it, causing disinti); of the woven network. lip to now the.workers have not been using personal protective &* *,. or po's ting s ignsv^ftousekeeping de tai1s are-often ignored ..particles *.r i debris are-just ^brushed aside. No special provisions for disposing * .** waste material-have^been adhered to. The consako material is stored hazardly, pieces:are often left laying around the shop. The present operation was performed on a table on the eva side shop. The worker was Harold Ahuna, badge no. 038-11596. The table covered with canvas, no containment was used. He was instructed to simulate the typical gasket making and asbestos material handling used by the shop employees. He used tinsnips, a metal template, and hammer. Men were workftig ten feet away and hand printed sign savin; "Caution Asbestos Test" was displayed. INVESTIGATION PROCEDURE: 1. Three Bendix Super Sampler Pumps BDX41, serial numbers 3-77-08, 3-77-03 and 3-77-14. Pumps were calibrated on 8 May 1978 with a Universal 'ump Calibrator, Model 302. Flow rates ranged from 1.29 to 1.67 1/min. 2. Miliipore aerosol field monitors with cellulose ester filters, size .8 The undersigned took three air samples. One was taken as clos the cutting operation as possible in order to estimate the concentrii a. '< -re ny/ ft . oMi F- w rr no rt H* mi rt CD {D M pu CU O C ft !!* g * rg @ ct p W go re rt of fibers created. One was taken ten feet in back of the operator in the breathing zone of the nearest workers. One operator breathing zone sample was taken in order to estimate the exposure of th; operator. Sampling time was approximately one-half hour. The sampling Records the airborne asbestos concentration produced by a composite of a S >estos handling operations and would thus represent a typical day's e jeposure of a X38 employee. These operations included pounding the consalco material with a hammer, punching holes by hammering the material on a jlummy plate, cutting with tinsnips, cutting holes with template and hammer cleaning up by placing debris into blue poly bags, wiping the area with a paper towel and rolling up the canvas covering on the workbench to dispose of it. The cassettes were analyzed as directed in reference (a) rfpt- oHin*>H Pft* HW ft- ft PO Pft rOt r+r NC MI Z30 UlM Iz 030 wm . XM 00 innum a Dummy plate to simulate valve flange 'Thei resuTts"r-a>,re''"tabulated in-Table 1. DISCISSIONS:-;', ,, ' Mimiltf! 4 The T.W.A. fiber counts were lower than the two fibers tfer c.c. T.W.A standard promulgated in reference (b). On the other hand, rt ference (c) notes that NIOSH recotranended in 1976 that the time weighted verage occupational exposure to asbestos fibers be lowered to .1 fit er/cc. with this in mind, BUMED has recommended that all personnel who a exposed to concentration of .1 fiber/cc should be included in the Asbes tfos Medical Surveillance Program. Since the T.W.A. produced by the oper tion (sample i) is very close to .1 f/cc, men who make gaskets should also be included in that program. Also, since the object of the Shipyard Asbestc s Control Program is to "Keep fitters out of people's lungs," the persorbl protective measures as outlined in references (b) f. (d) should be instituted. RECOMMENDATIONS: 1. A seperate roon in Shop 38 should be set aside for all gtsket making operations. The area should be posted as described in reference (d) 2. The personal protective equipment outlined in reference b) should be worn by gasket makers. 3. More attention should be paid to housekeeping details, Iarger pieces of asbestos material should be stored in blue poly bags and Smaller pieces in zip-lock plastic bags. Dry sweeping should not be allowec The area should be vacuumed with an NRMC-approved asbestos vacuum clei ner. Care should be taken not to produce airborne particles in all opei ations. a ''I.. <,, -.-rrl A'- % 4. All asbestos material should be labeled with black and yellow asbestos caution taps described in reference (d). 5. An acceptable substitute for asbestos valve packing cord shou :.d be found. 6. All men who handle the asbestos valve packing cord should wea both cotton gloves and surgical gloves. They should wash their hands :md arms thoroughly after completing the work. In addition, cutting tools should be cleaned with a damp rag. 8. All asbestos scrap and asbestos contaminated waste bag and du nped in a designated asbestos dumpster. 9. All Shop employees should be given an asbestos indoctrination since nearly all of them make gaskets or handle other asbestos material at one time or another. 10. All gasket makers should be included in the Asbestos Medial Surveillance Program. 11. A more indepth study on the relationship between local,air currents and asbestos fiber dispersion should be made by the Industrial Hjgienist. yCD rr u rP-- rn p. v in rr . O y** W (PD" rr n rr M rr P(T)4 Kto C(aD HH a a. 1 0 no oc pi" \ Vi. r-OC Mi Ox>to -230 UlHm I ZU> cochj LU I C2D2 m tn xmm : ' >H ift M (OH jCn-4 rvicD 4jZC 9jH30 ( 90 ao i >.4 /Tm Table 1 Monitoring results of Simulated Gasket Cutting Operation Shop 38 Sample 1 Time Area 1245-1317 Within one foot of operation fibers/c.c. .69 2 1245-1318 10 feet from operator 0 3 1245-1315 Breathing zone .21 Note: TWA is based on 1 hour maximum exposure time. #v * TWA .09 fibers/cc 0 .0 ) fibers/cc (T> ''C CD d> (i* ffl rf .O CD J.T* h+ u* ro rt O fTt* H Hfi>-* MHo p. CD a Hft) H0 ro> reo 0p0 rt lNfc~ f-nc I uiMrn I Zi/ coo u ; u> m I o XMfll > -4 <J& M l OH 'cCnH .fVico Ussc 0,-150 . o9O0 '