Document VbO9Zz3ngOrZwVZe8gZbyaJZ

% .+ & e-' VI TOXICITY SAFETY ENGINEERING STANDARD MEASUREMENT AND CONTROL OF ASBEST.OS DUST EXPOSURE issueo 1HII Mil KVIIIO S4T Poge I ol 5 Any portion of this or referenced document printed in red is o mandatory requirement of the Willioms-Steiger~j Occupationol Safety and Haolth Act of 1970 (OSHA) ot published in tho Federal Register. __ __ s n t! 0 * 4. uo il il OL 0u I: if 0 5* ou* S* > 5 n < ax zs-- ui w p M s* w I. 0 u 'If* IS I IU 1. SCOPE 2.4 Control methods, such n hut not limited to, rnrlu- *1 This standard prrsrnts (he permissible exposure limits to asbestos dust, genera! information on methods of controlling asbestos dust exposures, and describes on acceptable method of sampling asbestos dust concentra sure, vacuum sweeping, and local exhaust ventilation, i shell lie used to meet the permissible exposure limits, tee section 3. 2.3 Respiratory protective davices, shell be provided] tions in the work area. and used where such control methods are not feasible. | 2 GENERAL or do not otherwise reduce the concentrations below the t permissible exposure limits.jsce section 4. 2.1 Asbestosis end lung cancer have long been associ ated with exposure to asbestos. Historically, the incidence 2.6 Hygieno requirements are included in section 5. of these diseases has been significantly higher among 17 Sampling. For sampling equipment, monitoring. asbestos workers than among the general population. Ij analysis record keeping, and warning signs, see -I section 6. 2.2 Principal sources ot exposure to airborne uabesfoa dust tn Company operations have been: I 23 Nona^baitos bearing muteriaU ahoutd he substi- a. shops b. Cutting insulation by power saws in fabrication Opening boxes and removal of new insulation j, tuted where asbestos contribute* to a dust concentration1' | exceeding the permissible exposure limits. 3. CONTROL OR ASBESTOS DUSTS e. Removing old insulation from linea and vessels 11 Handling Asbestos Insulation d. Mixing asbestos to form cement 3.1.1 Cartons of block insulation are a potential j source of severe dust exposure and should be handled a. Removal of clothing after completing insulating I duties with care. The rough, abrasive nature of the block mate rial creates dust within the cartons. f. Cutting asbestos shingles, Transits, etc 3.1.2 Cnrtont of new insulation should be vacu umed upon opening, end prior to removal cf block*, g. Spraying insulation or fireproofing to remove dust. ,1 * h. Asbestos materials used in production of Com 11.3 Asbestos block* muat be bandied with care pany products at all time* to minimize dusting. 2.3 Pormitslbf# Expoavr* Limiis. Asbestos dust concen i trations in air shall not exceed an 8-hour time-weighted | average (TWA) of 5 fibers longer than 5 microns per cubic centimeter (ce) of air. At no time may the concen tration exceed a ceiling of 10 fibers longer than 5 microns percc. ______ 2.3.1 The 8-hour time-weighted average (TWA) is the svernge concentration occuring over a period of 8 continuous hours. 3.1.4 Purchase of block insulation with a glare coaling ia recommended. This mikee il virtually dust free for handling purposes. 12 Asbestos Cutting Operation* 3.21 All hand-operated or power-operated tooia I which may produce or release asbestos fibers in excess I of the permissible exposure limits shall be provided with ' a dust collection system, see 3.6. 2.3.2 After July 1. 1970, the TWA is reduced from J> to 2 fiber* longer than 5 microns m-r ce._______________ 3.22 AM mnjor power-cutting machines ehould he i. olated in n separate working area. Perilous printed In red meet OSHA roqulotlrms, Suction I910.93o. _] Vendors ond merchandise dectgnarlons o.*o plvsn tn describe materiel* end may net Include alt eccoptouteproducts. St Itstiiullcnt by sui'plicts at* ta be mada only on approval vt the iocat oulherity inl-lntinp tne use ot this stendard. SiroeovMiTTt' ns. x* c*zrd '304 DUP 0902927