Document qmVnQ29JOpkwok630Zme0N89n

FILE NAME: Marley (MAR) DATE: 1971 Dec 9 DOC#: MAR034 DOCUMENT DESCRIPTION: Industry Recommended Practices Guide $> 19?I , Ceanin&'z c C ifO tiity H z its e . ? Issue No. 27 . NUMBER "~ f merit J DECEMBER 9, 1971 Emergency Asbestos Standard Promulgated The Occupational Safety and Health Administration has determined that the currently effective standards for asbestos dust concentrations are dangerous to employees' health and has promulgated an emergency standard reducing allowable concentrations of the hazardous substance. A new section 1910.93a has been added to the Occupational Safety and Health Standards at 6647.93a, which reduces the formerly permissible concentration of 12 fibers per milliliter greater than five microns in length for an eight-hour time-weighted average to S fibers per milliliter for the same size particles. This standard is immedately effective. The emergency standard requires employers to provide engineering con trols t o abate excessive dust concentra tions and respiratory equipment where the controls are not feasible or capable of controlling the dust levels. Require ments have also been set for the use of dust collecting devices on hand and power tools and for gathering and disposing of asbestos dust. Details of the new standards are found at f 8239 as well as the technical changes made in other standards -to reflect the emergency standard. SBA -Releases Policy Statement on Safety Improvement Loans T he Small Business Administration has issued its policy guidelines for making safety improvement loans. The Occupational Safety and Health Act authorizes improvement loans if. the!Administration determines that substan tial economic injury will result to the firm if required safety improvements are madd. Only firms meeting the size requirements of the SBA Rules and Regu lationJs., Part 121, are eligible. \ / Permissible: Loan Purposes Ldans may be authorized to construct a new building, replace working capital {expended incidentally for compliance/meet equipment notes or mort gage paiymetits, help finance startup"costs,'and finance changes in methods ----------------------------------------------------T h i s r e p o r t in in. t w o p a r t s . T h i s i s T n r t 1 .------------------------------ ------- ------- -- \ C O M M E N C E , C l-E A M H G , H o h S E J n C PU B LISH E R S T O P I C A L L. A W R E P O R T S NEW YORK C H IC A G O W A S H IN G T O N " / MARDEP001359 c- Humber 23--zi 12-16*71 O ccupational S afety and Health Act 3477-5 T able G-3--MiKKbal D usts T able 0 - 3 - MinKn.\i- D u3t3 Subsi&iico M p p ci Mj/M* ?.u b s!2 nco M p p rI' M-j/M1 Silica: Cryst-ftUlna: Qu& iu. (rfvsplrublo)________ 20 * lOjDgfM* " % S10}+0 Q u a r tr (to ta l d o s t) ________ ____________ CrJstobalito: Uso tho ttuo calc u late d fr o m th e co u n t o r m&is fo im u la t for quartz.. Trldym ito: Uso Um value calculated from tfao for m ulae for quw tx. A m orphous, inclodlns natural dlatom aceous earth. 20 % S,O H -2 30xog/M* %SjOj+2 Sfimg/M* %sio3 81Hcatcs (less t h a n 1% c ry s tallin e silica): M ic a ______ __ __________ _ S o ap sto n e_____ _____. . . . __ T a lc _______________________ P o r tla n d c e m e n t . . . . . ____ . G ra p h ite (nfediral)_______ . . . Coal d u s t (respirable fraction, less t h a n b% SlO i)_______ _ F o r m o re th a n h% S lO j______ 20 20 20 60 16 2.4rog/MJ or lOrag/M? %SiO,+2 iff 6647.93a) 1910.93a Asbgstos dujtf. (a) The 8-hour time-weighted aver age airborne concentration of asbestos dust to which employees are exposed shall not exceed 5 fibers per milliliter greater than 5 microns in length, as de termined by the membran.ee filter method at 400-45Ox magnification (4 millimeter objective) phase contrast illumination- Concentrations above 5 fibers per milliliter but, hot to exceed 10 fibers per milliliter,'may be permitted up to a total of 15 minutes in an hour for up to 5 hours in an 8-hour day/ <b) Engineering methods, such as but not limited to, enclosure, vacuum sweep ing, and local exhaust ventilation, shall be used to meet the exposure limits pre scribed in paragraph (a) of this section. Where such engineering methods are not feasible, or do not otherwise reduce the concentrations below, those prescribed in paragraph (a) of this section, respira tory protective devices shall be provided and used in accordance with paragraph (c) of this section. ( 0 ( 1 ) (i) When the limits of ex posure to asbestos dust prescribed in paragraph (a) of this section are ex ceeded and when engineering controls required by paragraph (b) of this section are not feasible or do not otherwise re duce the concentration of asbestos dust Employment Health and Safety Guide Inert or N uisance Dyol: RSepIr&blo fra c tio n ................. T o ta l d u s t........-............... 13 fimg/M1 to lfimg/M* N ote: Conversion factors-- mppclX35.3=mflllm p articles per cubic meter =pertlcjE3 per c.c. M illions o p a rtid a s p e r c u b ic fool o l a ir, b ased on im pingar sam ples co u n ted b y llght-Oold technics. ` T h a percentage of crystalline silica In the formula is th a am o u n t determ ined from elr-borno samples, except In those Instances In which other m ethods navo been shown to be applicable. i As determ ined by th a m em brane filler m ethod at 130 X phoao c o n tra s t m agnification. " Both concentration and percent quartz for the application of th is lim it a re to bo determ ined from th e fraction passing a site-selector W ith the following characteristics: Aerodynamic diam eter (uni t density sphere) Percent passing selector 22.5 9760 35..50 2650 10 0 T h o m easurem ents u n d e r th is u o te refer to th e use of an A B C In stru m e n t. I f th o respirable fraction of coal d u st is determ ined w ith a M R th e figure corresponding lo t h a t of 2.4. Mg/M* in. th e t a b le for coni d u s t Is 4.5 Mg/M* [As amended at 36 F. R. 35101, Aug. 13, 1971, and at 36 F. R. 23207, Dec. 7, 1971.] below those prescribed in paragraph (a) o i this section, the employer shall re quire the use of respiratory protective de vices. The selection .of respiratory protective devices shall be limited to those specified in the remaining sub paragraphs of this paragraph (c). Cill The employer shall require that each employee test his respiratory pro tective device before each use in order to insure a proper fit according to the manufacturer's instructions. The em ployer shall further provide for effective training or supervision of employees in the testing of respiratory protective de- vices for St before their use. *s (2) For an atmosphere containing not | more than 25 fibers per milliliter greater than 5 microns in length over an 3-hour | average, or more than 50 fibers per m.llll- \ liter over any period of 15 minutes, a V reusable or single-use filter type respira tor, operating with negative pressure during the inhalation phase of breathing, approved by the U.S. Bureau of Mines under the provisions of 30 CFR Part 14 CBureau of Mines Schedule 21B), or a valveless respirator providing equivalent protection, shall be used. (3) For an atmosphere containing not more than 250 fihers per millilter greater than 5 microns in length over ah 8-hour average, or more than 500 fibers per milliliter over any period of 15 minutes, a powered filter positive pressure res- II 6647.93a . l a 1 $ f^ fir -- r MARDEP001360 !?!%;! fe *** vt*e * \ -r %'() '***,^^*i illf a s m f !M <?%%**&&*' ...J { | * -, -zJss&Mm^' 3478 R e g u la tio n s H u m b e r 23--22 12-16-71 plrator approved by .the U.S. Bureau of Mines under the provisions of 30 CFS Part 14 (Bureau of Mines Schedule 21B) shall be used. (4) For m atmosphere containing more than 250 fibers per milliliter greater than 5 microns in length over an 8-hour average a type C positive pres-, sure supplied-air respirator approved by the U.S. Bureau of Mines under the pro visions of 30 CFR. Part 12 (Bureau of Mines Schedule 19B) shall be used. : (5) The employer shall establish a respirator program in accordance with tire requirements of American National r ',,w. teStion Z88..2~1963. Tsf^HS^felplraiors provided each em ployee shall be properly inspected, cleaned, repaired and stored. (d> Cl) When an employer has em ployees who are exposed to asbestos dust exceeding the limits prescribed in para graph (a) of this section and the ex posure results from the operations 'de scribed In the remaining subparagraphs of this paragraph (d>, the employer shall comply with the .requirements of these subparagraphs relating to the operations involved. The requirements of this para graph are in addition to those prescribed in paragraph (b) of this section. . (2) All hand- or power-operated tools which produce asbestos dust such as, but not limited to, saws, scorers, abrasive Wheels, and drills shall be provided with local exhaust ventilation and dust col lectors in accordance with the American National Standard Fundamentals Goveming the Deslfrn. aS'J.Qngr.ationp.f,E-ocal. Exhaust Systems; AIJSI1Z9.2--i'971." " (3) Employees exposed to the spraying of asbestos or the demolition of pipes, structures, or equipment covered or insulated with asbestos shall be provided with respiratory, protective devices in accordance with paragraph (c) (4) of this section. <e> Asbestos cement, mortar, coatings, grout, and plaster shall be mixed in closed bags or other containers. (f) Asbestos waste and scrap shall be S collected and disposed of in sealed bags J V or other containers. -<= p* (g> All cleanup of asbestos dust and 'i y blowing shall be performed by vacuum j cleaners. No dry sweeping shall be per-,,--" V ....formed. [1910.93(a) added at 36 F. R . 23207, Dec. 7,1971.) [ f 6647.94] 1910.94 Ycnlittion. (a) Abrasiva blasting--(1) Defini tions applicable to) this paragraph.--(1) Abrasive. A solid Substance used in an abrasive blasting Operation. (il) Abrasive-blasting respirator. A continuous flow alif-line respirator con structed so that it Vjll! cover the wearer's head, neck, and shoulders to protect him from rebounding abrasive. (iii) Blast cleaning barrel. A complete enclosure which rotates on an axi3, or which has an internal moving tread to tumble the parts, injorder to expose vari ous surfaces of the parts of the action of an automatic blast fspray. (iv> Blast cleaning room. A complete enclosure in which blasting operations are performed and] where the operator works inside of the' room to operate the blasting nozzle and jdirect the flow of the abrasive material. (v) Blasting cabinet. An enclosure where the operatoi; stands outside and operates the blasting nozzle through an opening or opening^ in the enclosure. (vi) Clean air. Afr of such purity that it will not cause hnrjn or discomfort to an individual if it Is inlialcd for extended periods of time. | (vji) Dust calleeCor. a device or com bination of devices| for separating dust from the air hanciled by an exhaust ventilation system. | (viii) Exhaust ventilation system. A system for removing contaminated air from a space, comprising two or more of the following elnents (a) enclosure or hood, <b> duct wyrk, (c) dust collect ing equipment. Cd>] exhauster, and (e) discharge stack. f . (ix) Particulate-filter respirator. An air purifying respirator, commonly re ferred to as a dust fr a fume respirator, which removes mas of the dusi or fume from the air passing through the device. (x) Respirable dust. Airborne dust in sizes capable of passing through the up per respiratory system to reach the lower lung passages! (xi) Rotary blast) cleaning fable. An enclosure where the pieces to be cleaned are positioned on a rotating table and are passed automatically] through a series of blast sprays. 5 (xil) Abrasive blasting. The forcible application of an abrasive to a surfnee by pneumatic pressure, hydraulic pres sure, or centrifugal fbree. 1? 6 6 47 .9 4 1971, Commerce Clearing House, Inc. / MARDEP001361