Document kmEVnQnBYNBab6yZd7d9b44Y0

+ 139 S4T.pl MEASUREMENT AND CONTROL OF AS8EST0S OUST EXPOSURE ISSUED TH4$ PAGE REVISED RSTEAANFOFIARRMOED SAFETY ENGINEERING STANOAR0 APRIL 1973 OCT 1985 NOV 1984 S4T Page 1 of 8 This standard includas requirements of the Occupattenal Safety and Health Act of 1970 (OSHA) as puolished in the redarat Reg st*' OSHA information is printed in red. i. scope b. Removing, handling, and laundering of asbestos-contaminated clothing 1.1 This standard presents the permissible asbestos dust exposure limits, methods of controlling asbestos dust exposures, special OSHA requirements for removal of asbestos insulation, respiratory protective equipment, and method of sampling asbestos dust concentrations in Cutting new or removing weathered asbe<to> (Transite) siding, roofing, pipe, etc, or Haveg id equipment the work areas. It provides sufficient information to comply with OSHA and EPA regulations but guidance from the Du Pont Legal Dept (via the Departmental OSH <L Maintenance and operation of machinery and icle brake linings Coordinator) should be sought whenever an interpretive t. Opening boxes and removing new asbestos problem arises. materials 1.2 An Asbestos Compliance Package can be obtai from the Occupational Health and Water Trecmi group of ESD. Ref (1) contains extensive ad . information. , Cv^ . Handling asbestos materials used in production of Company products 13 A comprehensive book on asbestor control has been published. Ref (14). I* and detailed information on ashes' niques, monitoring, and disposal checklists for removal jobs and sc contractors. The removal lechniq, is called "negative air filtration'' ana fi. Repair of laboratory equipment with asbestos ' ` lated heaters, e.g., gas chromatographs, lab ovens ^4}'VTqr'1eaning and maintenance of vacuum systems AA* f asbestos fibers WAS blankets and cloths a portable, HEPA equipped powered ex. technique is also explained In an Environm. lion Agency report that has been reprinted undv "Controlling Asbestos Contamination with Negab Filtration Systems," Ref (15). The report contains a . ^a estos floor tile and adhesive , _ <0 ^itutes should be used *^V^^sTn*ver the "* of tailed operating procedure for asbestos removal and an evaluation form that would be useful in auditing the re on asbestos moval job. It also contains much of the same information in the more expensive book identified as Ref (14) 2. GENERAL 2.1 Asbestosis and cancer are associatef umh over exposure to asbestos. Historically, the inoKnce of these diseases has been significantly high^aBmong asbestos workers than among the general i^^iUtion. Cigarette smoking greatly increases the iimbace of respiratory cancers arising from exposure to asbestos. Asbestosexposed persons who smoke have a S3-fold increase in risk from lung cancer over nonsmokers, Ref (2). a2-.44 ^ e.g., Tran, %C/4 . - fibers, rdous dur- ing normal mpressed as- bestos gaskets,' felt, Teflon* impregnated asbestt. .rated asphalt cut- back (mastic). These m. *i become hazardous if asbestos fibers are relea. .ause of loss of binder or a physical action such grinding. Supervision should inspect use of these materials to determine if respirators are needed. 2.2 Principal potential sources of exposure to airborne asbestos dust in Company operations are: a. Removing old asbestos-containing insulation from lines and vessels, including gaskets on hightemperature lines 2.5 A material which contains asbestos which might become airborne should be treated as asbestos unless it is determined that the asbestos present is not a potential health hazard. Talc, vermicullte, and other minerals are listed by Appendix 1 of Ref (1) as possibly containing asbestos. suscouurmi no. no Vendors and merchsndtoe designations am given to describe materials and may not include a* acceptable products. Substitutions by suppliers are to be made only on approval of trie local authority initiating the use of tbit standard. Si!i;i nes oocuueir a ths mownr cm ou meomwTiON HensN u*r not k useo non oe NCMouns *mo comcanv. the techmou. without ths remessioN oe ou cont. O C TJ O 00 CO 00 at in 00 SAT Pq 2 i___________________ MEASUREMENT AND CONTROL "OF ASBESTOS DUST EXPOSURE This Page Rev Oct 1985 3. EXPOSURE UMITS 3.1 Amosite, chrysotile, aad tremolite asbestos fibers concentration* in air (hail not exceed an 8-hour (and 12>hour) Acceptable Exposure Limit (AEL) of 0.5 fiber* longer than S micrometers per cm3. 3.2 The types of asbestos occurring in Du Pont are amosite, chrysotile, and tremolite, a potential contami nant in tale. 3.3 Since crocidoiite asbestos is not known to be present in Du Pont, its toxicity was not considered in setting the AEL. (Use the ACGIH TLV 8-hour TWA of 0.2 fibers longer than S micrometers per cm3.) If encountered in Du Pont, Haskell Laboratory should be contacted. 3.4 At no time may exposure to airluirne fibers concentration exceed a ceiling of 10 fibers longer than S micrometers per cm3. 4.3-3 Caution signs aad labelm thall be used per section 12. 4.2.4 \f asiiestos cement, mortar, etc. or similar material containing dry friable asbestos fillers -hall be removed from bags, cartons, or other containers in w hirh they are -hipped without being either wetted, en closed. or ventilated to effectively prevent the release <>I asliestos Rivers in excess of the limits in section 3. 4.3 Tools Usod on Asbestos 4J.1 Avoid sawing where possible; knife cutting is preferred. 4.3.2 All hand-operated and power-operated tool* which may produce or release asbestos fibers in excess of ex|iosure limits, i.e., saw*, scores, abrasive wheels, and drills, shall be provided with a dust-collection system as specified in 4.1. 4. CONTROL OF ASBESTOS DUSTS 4.1 Engineering controls, such as. but not limited to. isolation, enclosure, exhaust ventilation, and dust collection shall be used to meet the exposure limits in section 3. 4.1.1 Local exhaust ventilation and dust collec tion systems shall be in accordance with ANSI Z9.2 -1971, ''Fundamental- Governing the Design and Operation of Local Exhau- v stems." 4.1.2 Additional information on the design of ventilation systems is contained in H1U, HSU, DH1U, DG20D, and Ref (1) and (4). 4.2 Handling Asbestos 4.2.1 Insofar os practical, asbestos-containing materials shall be handled, mixed, applied, removed, cut. scored, or otherwise worked in a wet state sufficient to prevent the emission of airborne fibers in excess of the exposure limits in section 3. 4.3.3 All asbestos-cutting operations should be isolated to minimise unauthorized access. This can be a temporary area for nonroutine operations with barri cades and signs per section 12. Routine work should be isolated in a properly posted separate work area. 4.4 Removal of Asbestos Insulation 4.4.1 If the composition of the material is un known, it shall be treated as being asbestos. For use of labels to identify nonasbestos insulation, see SN218P. 4.4.2 Proper rrspirators (per section 5) and spe cial protective clothing (per section 9) shall lie provided all employees engaged in removal or demolition of asbestos insulation or covering. Atmosphere supplying respirators are required except where it has dearly been demonstrated that the wet method is effective and moni toring has shown that airborne concentrations of as bestos on the job will not exceed the OSHA protection factor of the air purifying respirator. Respirator selec tion information is provided in section S. 4.2.2 Housekeeping. All external surfaces thall be maintained free of asbestos fibers if. with their dis persion, there would be an excessive concentration. 4.421 At a minimum, air-purifying respira tors (52) and special clothing shall be worn during the removal of asbestos insulation. Many plants have found a. All areas where asbestos is routinely handled shall have a vacuum cleanup system. This can be a system of hoses connected to a central vacuum system disposable dust masks (52.1) (NIOSH approved for asbestos) and disposable paper clothing satisfactory (522). designed in accordance with 4.1.1. Vacuum hoses should be inspected periodically to ensure they are five of loose asbestos fibers. These hoses should be appropriately-, isolated, i.e., placed in a sealed, labeled bag. a. This requirement does not apply to removal of insulation, fabricated and protected to withstand re peated removal and reinstallstion for equipment mainte nance or other reasons, providing the techniques b. No dry sweeping shall be performed. Com employed have been demonstrated to maintain asbestos pressed air is not to be used for cleanup. concentrations within exposure limits of section 3. Portions pnrttsO in rsd mart OSHA regulations, Ssction ;9t0. tOOt (temsrty 93s)- DUP 0838559 ISO S4T. p2