Document XzLLJpBKDDaJ96a8z4EQZr3R4

, 10466, RULES AND REGULATIONS Title 29--LABOR Chapter XVII--Occupational Safety and Health Administration, Depart ment of Labor PART 1-910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS National Consensus Standards and Established Federal Standards Pursuant to authority in sections 6(a) and 8(g) of the Williams-Steiger Occu pational Safety and Health Act of 1970 (84 Stat. 1593,' 1600: 29 U.S.C. 655, 657), Chapter XVII of Title 29 of the Code of Federal Regulations, established on April 13, 1971 (36 F.R. 7006), is hereby amended by adding thereto a new Part 1910 to read as set forth below. The provisions of 5 U.S.C, 553 concern ing notice of proposed rulemaking, pub lic participation therein, and delay in effective date are inapplicable by virtue of the exception to 5 U.S.C. Ch. 5, pro vided in section 6(a) of the Act. The new Part 1910 contains occupa tional safety and health, standards which are either national consensus standards or established Federal standards. The national consensus standards are occupational safety and health standards adopted and promulgated either by the American National Standards Institute (ANSI) or by the National Fire Protec tion Association (NFPA) under proce dures whereby it can be determined that persons interested and affected by the scope or provisions of the standards have reached substantial agreement on their adoption. I have determined that those standards have been adopted and pro mulgated under such procedures. Ac cordingly. pursuant to this determina tion, after consultation with other appropriate Federal agencies, and in ac cordance with section 3(9) of the Act, I do hereby designate as national consen sus standards those standards m Part 1910 which are standards adopted and promulgated by either the American Na tional Standards Institute or the Na tional Fire Protection Association. The national consensus standards contain only mandatory provisions of the stand ards promulgated by those two organiza tions. The standards of ANSI and NFPA may also contain advisory provisions and recommendations the adoption of which by employers is encouraged, but they are not adopted in Part 1910. The established Federal standards are operative occupational safety and health standards in effect on April 28, 1971, and established by the Department of Labor pursuant to section 107 of the Contract Work Hours and Safety Standards Act, as amended (40 U.S.C. 333); section 41 of the Longshoremen's and Harbor Workers' Compensation Act, as amended (33 U.S.C. 941); the Walsh-Healev Pub lic Contracts Act. as amended (41 U.S.C. 35' ; the Service Contract Act of 1965 (41 U.S.C. 351'; or pursuant to the National Foundation on the .Arts and Humanities Act (20 U.S.C 9511. In any proceeding to enforce any such standard, brought under any of such statutes or under the Wllliams-Steiger Occupational Safety and Health Act of 1970, the principle of collateral estoppel will be followed. The effective date of the national con census standards is delayed for 90 days with respect to every employer and em ployment subject to the Williams-Steiger Occupational Safety and Health Act of 1970. The effective date of the established Federal standards is also delayed for 90 days, but only for employers and em ployments not subject to any of the statutes listed in the preceding para graph. The purpose of the delay is to insure that affected employers and em ployees would be informed of the exist ence of the standards and of their terms, and to give such employers and employ ees an opportunity to familiarize them selves with the requirements of the standards before their application. The delay is also intended to afford a State a full opportunity to apply for an agree ment under section 18<h) of the Act per mitting it to continue to enforce one or more occupational safety and health standards in the State and to submit a plan under section 18(b) of the Act for the development and enforcement of State safety and health standards. How ever. for established Federal standards which correspond to occupational safety and health standards (1) promulgated under any of the statutes listed in the preceding paragraph and (2) applicable to any employer and any employment by virtue of any of such statutes, no delay in effective date is provided with respect to such employer and employment, in the case of employers and employments subject to standards issued under such statutes, familiarity already exists. An additional delay in effective date until February 15. 1972. is provided and codified m the new Part 1910 m sections within Subparts G, H, I. L. N, O. P. R. and S in situations where additional time is considered necessary to adjust to the new standards. Elective ame The occupational safety and health standards m new Part 1910 shall become effective on August 27, 1971 except: (1) Where additional delays in effective date are specifically provided, and (2) with respect to any employment and place of employment which, on a date before August 27. 1971, is or be comes subject to any safety and health standard prescribed in 29 CFR Parts 505, 1501. 1502, 1503. 1504, 1516, or 1518. or in 41 CFR Part 50-204, any correspond ing occupational safety and health standard in Subpart B of this Part 1910. or in Subpart D through S which are from 41 CFR 50-204, shall also become effective, and shall be applic^ole to such employment and place of employment, on such earlier date. For example, when ever a standard promulgated under the Contract Work Hours and Safety Stand ards Act and contained in 29 CFR Part 1518 is applicable to an employment and places of employment by virtue of the performance of a construction contract on a date before August 27, 1971, the corresponding standard prescribed by 1910.12 of new Part 1910 shall also be come effective on the same aate with respect to such employment and places of employment. However, this effective date provision shall not be deemed to relieve any employer of any duty 'under section 5>a) il' of the Act to furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or likely to cause death or serious physi cal harm to his employees, or to relieve the Secretary7 of Labor of his respon sibilities and authority under section 13 of the Act to initiate enforcement pro ceedings to counteract imminent dan gers. where any employer breaches such duty under section 5(a)(1). The new Part 1910 is set forth below. Signed at Washington, D.C., this 27th day of April, 1971. J. D. Hodgson, Secretary of Labor. PART 1910--OCCUPATIONAL SAFETY AND HEALTH STANDARDS Sec 1910.1 1910.2 1910.3 1910.4 1910.5 1910 6 Swbport A--Generol Purpose and scope. Definitions. Petitions for the issuance, amend- mea:. or repeal at a standard. Amendments to this pert. Applicability of standards. Incorporation by reference. Subport ft^Adoption and Extension of Established Federal Standards 1910,11 1910 12 1910.13 1910 14 1910.15 1910.16 Scope and purpose. Ccnstruction work. Ship repairing. Shipbuilding. Shipbreaking. Longsfcoriog. Subpart C-- IReserved! Subport Walking---Working Surfaces 1910.21 1910 22 191023 1910 24 1910,25 1910 26 1910 27 1910.28 1910.29 1910 30 1910 31 1910 22 Definitions General requirements Gua.-i.ng door and wall openings and holes. Fixed industrial stairs Portable wood ladders. Portable metal ladders Pi.xec '.adders Safety requirements lor scafiold- lng Manually propelled mobile ladder stands and scafiolds cowers). Other working surfaces. Sources of standards. Standards organizations. 1910.35 1910.36 1910 37 1910 38 1910,39 1910.40 Subport E--Means of Egress Definitions, General requirements Means of egress, general. Specific means of egress require ments by occupancy Sources of standards. Standards organizations. Swbport FTMPow*red Platforms. Monlifts ond VeHide-Mounted Work Platforms 1910 66 1910.67 1910 63 1910,69 1510.70 Power platforms for exterior build ing maintenance. Vehicle-mounted elevating and ro tating work platforms. Manllfta. Sources of standards Stancards organizations. (f PLAINTIFFS e| | mgff [| FEDERAL REGISTER, VOL. 36, NO. 105--SATURDAY, MAy 29, 1971 ucc 109522 RULES AND REGULATIONS 10467 Subpart C Occupational HeoltH and Environmental Control S#C. 1910 93 'u-h; Air contaminants. Venr.l&ticz. 19:0,55 Occupational noise exposure. ' v 0 96 Irelation. 15:0 ST N-rnicnmng radiation. 1S10 S3 1910.95 Screes of standards. 1910.100 Standards organizations. Suddc" H--Haiordowi Materials :=;c ;s:o icc i = :c 102 1910. 104 1910. 105 1910. 106 1 C 1CT 1510 105 1910. 109 i9io. no 1310. Ill 1910. 112 1910. 113 1910.114 1910.115 1910.116 gases -- general re quirements. Acetylene. Hrdroaen. Osvgeu. Nitrous oxide. Flammable and combustible Louids. Spray finishing using aammable and combustible materials. D;p vazxs containing fiammable or combustible liquids. Zxolos.ves and blasting agents. Storage and handling of liquified oetrsleum gases. Storage and handling of ashy- irOU5 ~ri mnn 1a [Reserved] [Reserved] Additional delar in effective date. Sources of standards. Standards organizations. Subpen I---Pariona! Protective Equipment 1910. 132 General requirements. 1910. 133 Eye and face protection. 1910. 134 1910, 135 1910 135 1910 137 1910 138 :s:o :3S 1910,140 Respiratory protection. Occupational head protection. Occupational foot protection. Eieotniai protective devices. Additional delay in effective date. Sources cf standards. Standards organizations. Subpert ^Ginfrql Environmental Controls 1910 141 1910 142 1910 143 Sanitation. Temporary labor camps. Nonwater carriage disposal 1910, 144 1910, 143 i c: c 1^6 1910 14" 1910 148 Safety color code for marking physical hazards. Specifications for accident prevent.on signs and tags. Rescued' Sources of standards. Standards organizations. Subpert K--Medico! end Pint Aid 1510, 151 1910 152 1910 152 Med.czl services and first aid. [ Reserved] Source* c? standards. Subport l--Fire Protection 1910 156 Delusions a.p?Uc*ble to this suopajT. POF.TU iz Ftzr SwppazssioN Esorptararr 13m 's- Portable fire extinguishers. 1910 155 Standpipe and hose systems Fas rtzz Srrparsjio.v EatnpMirsT 1910. 159 1910, 160 1910. 161 1919 152 .Automatic sprinkler systems. dry chemical extinguishing systems. Carhcn dioxide syne mi. extinguishing [Reserved] * 2 1 `w 1 * a S 1 ,, . i 19.0 153 Local fire alarm signaling systems. [ P.eserved ] acc..:;oiial delay ;u execute date. Sec. 1910. 165a Sources of standards. 1910. 165b Standards organizations. Subpart FA--Cempretted Sat and Camprtsttd Air Equipment 1910. 166 1910. 167 1910. 168 1910.169 1910. 170 1910.171 Inspection of compressed gas cyl inders. Safety relief dences lor com pressed gas cylinders. Safety relief devices for cargo and portable denies storing com pressed gases. Air receivers. Sources of standards. Standards organisations. 8ubpart N--Material* Handling and Storage 1910.176 Handling materials--general. 1910.177 Indoor general storage. 1910.178 Powered industrial cruets. 1910.179 1910.180 1910.181 Overhead and gantry cranes. Crawler, locomctlve, and cranes Derricks. trucic 1910.182 Additional delay in eflecave d.tte, 1910.183 Sowces of standards. 1910.184 Standards organisations. Subpart O--Machinery and Machine Guarding 1910.211 1910.212 1910.213 1910.214 1910.215 1910.216 1910.217 1910.218 1910.219 1910.220 1910.221 1910.222 Definitions. General requirements for all ma chines. Woodworking machinery require ments. Cooperage machinery. Abrasive wheel machinery. Mills and calenders In tide rubber and plastics industries. Mechanical power presses. Forging machines. Mechanical power-transmission ap paratus. Additional delay In effective dateSources of standards. Standards organizations. Subpart P--Hand and Portable Powered Tooli and Other Hand-Held Equipment 1910.241 Definitions. 1910.242 Hsnd and portable powered tools and equipment, general. 1910.243 Guarding of ponab.e powered tools. 1910.244 Other portable tools and equip ment. 1910.245 Additional delay m effective date. 1910.246 Sources cf standards. 1910.247 Standards organizations. Subport 0^--Welding, Cutting qnd Brazing 1910.251 1910.252 1910.253 1910.254 Definitions Welding, cutting and brazing. Sources of standards Standards organizations. Subpart R----Special Industrie* 1910 261 1910.262 1910.263 1910.264 1910.265 1910 266 1910.267 1910.268 1910.269 Pulp, paper, and paperboard mills Textiles. Bakery equipment. Laundry machinery and opera tions Sawmills. Pulpwood logging. Agricultural operations. Sources of standards, Standards organizations. 1910.308 1910.309 1910.310 1910 311 1910.312 1910.313 Subpart Electrical Application (NFPA 70-1968 Article 90). National Electrical Code NFPA 701968 Genera! (NFPA 70-1968 Article 110) | Reserved | Overcurrtnt protection (NTPA 701968 Article 240 i , [Reserved) Sec. 1910.314 1910.315 1910.316 1910.317 1910.318 1910.319 1910.320 1910.321 1910.322 1910.323 1910.324 1910.325 1910.326 1910.327 19101328 1910.329 1910 330 1910.331 Grounding (NFPA 70-1968 Article 2501 Outlets, switch, and Junction boxes. and fittings (NFPA 70-1968 Ar ticle 370) . Flexible cords and cables (NFPA 70-1968 Article 400), [Reserved] Transformers (NFPA 70-1968 Ar ticle 450). [Reserved] Apnlianeea (NFPA 70-1968 Article 422) [Reserved] Hazardous locations, general (NF PA 70-1968 Article 5001. (Reserved] Hazardous locations. Class I Instal lations (NFPA 70-1968 Article 501). [Reserved] Hazardous locations. Class II in stallations (NFPA 70-1968 Ar ticle 502). [Reserved] Hazardous locations. Class HI in stallations (NFPA 70-1968 Article 503). Additional delay in effective date Sources of standards. Standards organizations. AtthozitT) The provisions of this Part 1910 issued under secs. 6(a), 8(g), 84 Stat. 1593, 1598; 29 G.S.C. 655, 657. Subpart A--General 1910.1 Purpose and scope. (a) Section 6(a) of the WiHiaxnsSteiger Occupational Safety and Health Act of 1970 <84 Stat. 1593) provides that "without regard to chapter 5 of title 5, United States Code, or to the other sub sections of this section, the Secretary shall, as soon as practicable during the period beginning with the effective date of this Act and ending 2 years after such date, by rule promulgate as an occupa tional safety or health standard any na tional consensus standard, and any es tablished Federal standard, unless he determines that the promulgation of such a standard would not result in im proved safety or health for specifically designated employees," The legislative purpose of this provision is to establish, as rapidly as possible and without regard to the rule-malting provisions of the Ad ministrative Procedure Act. standards with which industries are generally fa miliar, and on whose adoption interested and affected persons have already had an opportunity to express their views. Such standards are either (1) national con census standards on whose adoption af fected persons have reached substantial agreement, or (2) Federal standards al ready established by Federal statutes or regulations. (b) This part carries out the directive to the Secretary of Labor under section 6(a) of the Act, It contains occupational safety and health standards which have been found to be national consensus standards or established Federal stand ards. 1910.2 Definitions. As used in this part, unless the con text clearly requires otherwise: (a)"Act" means the Williams-Steiger Occupational Safety and Health Act of 1970 (84 Stat. 1590). FEDERAL REGISTER, VOL. 34, NO. 10S--SATURDAY, MAY 29, 1971 UCC * 109523 RULES AND REGULATIONS 10503 (vi) st~ength of step supports. When subjected to a load of 400 pounds applied at the approximate center of the step, tep frames, or supports and their guides tall be of adequate strength to1, a ' Prevent the disengagement of any step roller 151 Prevent any appreciable m.isalme- ment. c1 Prevent any visible deformation of tne steps or its support. vu - Prohibition of steps without handholds. No steps shall be provided un less there is a corresponding handhold aoove or below it meeting the require ments of subparagraph 14) of this para graph. If a step is removed for repairs or permanently, the handholds immedi ately above and below it shall be removed before the lift is again placed in service. 4' Handholds--<i) Location. Hand holes attached to the belt shall be proviced and installed so that they are not less than 4 feet nor more than 4 feet 8 inches above the step tread. These shall be so located as to be available on the both -up" and "down" run of the belt. til' Size. The grab surface of the handhold shall be not less than 4 Vi inches m width, not less than 3 inches in depth, and shall provide 2 inches of clearance from the belt. Fastenings for handholds shall be located not less than 1 inch from the edge of the belt. nil' Strength. The handhold shall be capable of withstanding, without dam age. a load of 300 pounds applied paral lel to the run of the belt. Prohibition of handhold without fcvpj so handhold shall be provided p.h'.c'v.t a corresponding step. If a hand- -hd .# removed permanently or tempo rarily. the corresponding step and hand hole for the opposite direction of travel shall also be removed before the lift is again placed in service. Type. All handholds shall be of re closed type. i i'p limit stops--i;i Requirements. Tvo separate automatic stop devices s-'-a'.l be provided to cut of! the power :-r.o ..nply the brake when a loaded step .pi-'V; me upper terminal landing. One irese shall consist of a split-rail s'- .'.cn mechanically operated by the step ro-.sr and located not more than 6 meres aoove the top terminal landing, -r.e second automatic stop device may consist of any of the following: _'0` .Any split-rail switch placed 6 -_-cr.es above and on the side opposite the --m; limit switch. 3 Am electronic device. `3. -A switch actuated by a lever, rod ` lhe latter to be placed on the , J;cie - nhe head pulley so as to just t--a. a passing step -- reset location. After the --as oee- stopped by a stop device -- ~,e necessary to reset the auto^`^P manually. The device shall be ~ . :r*a: a Person resetting it shall -- C-L..'\ Ciear view of both tne "up" anc ,.;urj of *-be rnanlift, it shall not - " 'J7.:aetfo10rmre.set tne device from any point. The initial him: - sr.a.i function so that the rnanlift will be stopped before the loaded step has reached a point 24 inches above the top terminal landing. dv) Electrical requirements, (a) Where such switches open the mam motor circuit directly they shall be of the multipole type. (b) Where electronic devices are used they shall be so designed and installed that failure will result m shutting off the power to the driving motor. (c) Where flammable vapors or dusts may be present all electrical installations shall be in accordance with NFFA No. 70-1968 National Electric Code, require ments for such locations. (d) Unless of the oil-immersed type controller contacts carrying the main motor current shall be copper to carbon or equal, except where the circuit is broken at two or more points simultaneously. (6) Emergency Stop--(i) General. An emergency stop means shall be provided. (ii) Location. This stop means shall be within easy reach of the ascending and descending runs of the belt. (iii) Operation. This stop means shall be so connected with the control lever or operating mechanism that it will cut off the power and apply the brake when pulled m the direction of travel. (iv) Rope. If rope is used, it shall be not less than three-eighths inch in diameter. Wire rope, unless marlincovered, shall not be used. (7) Instruction and warning signs-- (i) Instruction signs at landings or belts. Signs of conspicuous and easily read style giving instructions for the use of the rnanlift shall be posted at each landing or stenciled on the belt. (a) Such signs shall be of letters not less than 1 inch in height and of a color having high contrast with the surface on which it is stenciled or painted (white or yellow on black or black on white or gray). (t>j The instructions shall read ap proximately as follows: Face the Belt Use the Handholds To Stop--Puli Rope. (ii) Top floor warning sign and light, (a) At the top floor an illuminated sign shall be displayed bearing the following wording: "TOP FLOOR--GET OFF" Signs shall be in biock letters not less than 2 inches in height. This sign shall be located within easy view of an ascend ing passenger and not more than 2 feet above the top terminal landing. (b) In addition to the sign required by subdivision (a> of this subdivision, a red warning light of not less than 40watt rating shall be provided immedi ately belo\ the upper landing terminal and so located as to shine m the passen ger's face. (in' Visitor Warning, A conspicuous sign having the following legend--AU THORIZED PERSONNEL ONLY--shall be displayed at each landing. The sign shall be of block letters not less than 2 inches m height and shall be of a color offering high contrast with the back ground color. (d) Operating rules--(1) Proper use of manlifts. No freight, packaged goods, pipe, lumber, or construction materials of any kind shall be handled on any rnanlift. (e) Periodic inspection--(1) Fre quency. All manlifts shall be inspected by a competent designated person at intervals of not more than 30 days. Limit switches shall be checked weekly Man lifts found to be unsafe shall not be oper ated until properly repaired (2) Items covered. This periodic in spection shall cover but is no: limited to the following items: steps. Steo Fastenings, Ralls. Rail Supports and Fastenings. Rollers and Slides. Belt and Belt Tension. Handhoiders and Fastenings Floor Landings. GuardraUs. Lubrication. Limn Switches. Warnine Signs and Lights. Illumination. Drive Pulley. Bottom (boot) Pulley and Clearance Pulley Supports. Motor. Driving Mechanism. Brake. Electrical Switches. Vibration and Misalignment. "Skip" on up or down run when mounting step (Indicating worn gears) (3) Inspection log. A written record shall be kept of findings at each inspec tion. Records of inspection sh'll be made available to the Assistant Secretary of Labor or his duly authorized represent ative. (SOUWCE' ANSI A90.1-1969 Safety Code for Manlifts.) 1910.69 Sources of standards. Sec. Source 1910 66 1910.67 1910 6E ANSI .4120,1-1970 Safety Coae for Powered Platforms for Exterior Building Maintenance ANSI A92 2-1969 American National Standard fer Vehicle.Mounted Elevating and Rotating '.Vcrx Platforms ANSI .490.1-1969 Safety Coce for Maniifts. 1910.70 Standards organizations. Specific standards of the following or ganizations have been referenced m this subpart. Copies of the standards may be obtained from the issuing organization American National Standard; Institute. 1430 Broadway. New York, NY 10013 Subpa rt G--Occupational Health and Environmental Control 1910.93 Air contaminants. (Ga>e;. vapors, fumes, dust, and mists.) (a) Exposures by inhalation, inges tion, skin absorption, or contact to any material or substance (1) at a concen tration above those specified m the "Threshold Limit Values of Airborne Contaminants for 1970" of the American Conference of Governmental Industrial Hygienists, listed in Table G-i. except for the American National Standards listed m Table G-2 of this section ana FEDERAL REGISTER, VOL. 36, NO. 105--SATURDAT, MAY 2V, 1971 ucc 109524 10504 RULES AND REGULATIONS except for values of mineral dusts listed in Table G-3 of this section, and f 2> con centrations above those specified in Table G-l. G-2. and G-3 of this section, snail be avoided, or protective equipment shall he provided and used. b ' To achieve compliance with para graph < a > of this section, feasible ad ministrative or engineering controls must irs: oe determined and implemented in all cases In cases where protective equ.pmer.t cr protective equipment in addition to other measures is used as the method of protecting the employee, such protection must be approved for each specie apphcaaon by a competent in dustrial hygienist or other technically quainted source. Tj.3-,,z G-I Substance P-D-ni,. rog./M! .Uile............................................. ,`Mt. ,:"vae.......................... . Aortic *e:d.................................... Acetic anhydride......................... Acetone.......................................... Artronitnie.*...................... ........ Acerytene dichlonde. see 1. 2* 200 10 5 1.000 40 Aeerviene tetrabromide____.... Aopleia*............ .......................... Acriamme--Skm....................... Acre lonimle-- iteto.............. .. Aldra--Sfar............................... auti liciinl--sfcia..................... AUt' chlonde........ .................. "C Air! nh,r (AGE). A,,t\ nrorr cisulfide.......... XAZiiDoeihanoi. see Ethaool* I 0.1 20 n J 1<01 --*"t-, fme.......................... **Arr-or.^*................................. A.T.r .'-iur. su r* i` - (Am* `/JT.*' ......... .... SK*A~>. ....................... . Ar.jun*--sklfi................................ A-s-cn? (o tMtamffS}--Sliln., AntL--or.y aad compounds '&s Sb)......................................... AVTT 'i'.pns r.aphihy! :iiour*- ... ........................ j." c.mpour.'is < as Asi. A*?.,*-,, ........................ A:.r.: tm............. ai so 100 125 5 0.05 p-^r-socuinone. see Quvnone.. cr. *:.>................... ........ 1 A.s*f Diglycwrl THfVOT.ide ............. C io-?*. .................. 'Bromine per.ra^uonde.............. Sktn.. ................. Sctacjene 3-bntadier.ej........ Bnunetr.ioi. see Buryi ner* cantar........................... . 2-3u:inone.................................... 2-3ciorr ethanol Bu;xi Cellow ........................ Bw"r < n^ou^l aceutej. SK-Bury. acetate........... *............ tert-Bcryl acetaie.. Eurri a:noL... ..... c-Bc:yl alconol............... . tvt-Buryi alcohnj............... . C Burr.amine--Stem................... C C ~r'. --- V ,3:, (as r,-Eprr! ,:vnir) tbr (BGE).. ictv; mercaptan........................ >ter:-3t;tr i toluene...................... 1 l a1 0.1 0.5 1,000 200 so iso 200 200 100 150 100 5 50 0.5 10 CiirbZJ oii'ie....... ...................... `'Cccr ,5yrf:he*vic .............. r ---r! wr- W' Carr7'- ........................... . Curort* dioxide..................... .. Carbo' mon-n-a*.......... ............. * s.ooo 50 7'..:^%'^ cam men*-- ".jrtny; otide....... ^ p 'rr- Uicxid- ......................... - * i.ir.r t fr.duartde................. 1 0.1 01 15 360 is 20 2. *00 70 14 a. is 0.3 45 0.25 5 3 45 12 ft is 15 525 650 19 as o.s 0.3 o.s 0.2 0.2 0.5 5 5 15 10 3 0. 7 0.7 5 2 200 590 140 no 950 960 300 450 300 15 0, 1 -7-0 i. 5 60 5 5 35 3,000 55 0.5 O.S 0. 5 3 a3 0.4 Tabli G-I--Coo. SubsUnce p.p-m.- C Chloroaeeuldehyde............. a-Chloroacetophenone (phenacy icnionde). aoi Chlorobenzene (monochioro* beaxenej................... ............ 75 0-CMoroberuyliderte malononitrde (OCBM)......... aw Chlorobromomethane.............. 200 2-Chlorol.^butadiene, see Chloroprene. Chlorodiphenyl (42 percent Chlorine/--Skin.*....*......... Chlorodiobenyl (54 percent Chlonnei--Stem.___ 1-Chloro.2,3-epoxypropane, $m Epichlorhydrin.**................ 2-Chloroe;hanol, see Ethylene ohlorohydria......... ............. Chlofootbylene, see Vinyl choride*..,............ .............** C Chloroform (mchloro- methane)..**...*.................... SO l-Chloro-l-uitropropane........... 20 Chioroplena..................... .*.,* 0.1 Cbloroprene (2-chloro-l,3- boudjene)--Skin.................... 25 Chromium. sol. chromic, cbromoos salts as Cr......*.......... . Metal and tasol. salts........ Coal tax pitch rol&bita (ben- tens soluble fraction) anthra cene. BaP. pbeoanthrene. acridine, chrysene, pyrene.......**.... Cobalt, metal fume and dust*..-.......... Copper fume......... ...................... ......... . Dusts and Mists.......... ....................., Cotton dust (raw)................... *........... CrajrtJ) herbicide................................. Cresoi (all isomers)--Slew......... 5 Crotonaldehyde.......... ............ 2 Cumene--Skin................... SO Cyanide (as CN)--Skin....-..*....___ 'Cyanogen............... Cyclohexane, 100 300 CydohexaooL... SO Cyclohexanone.. so Cyclohexene__ _ 300 Cyelopenudiene 75 2. 4-D................. DDT-Skin....... DDVP, see Dlchlorvos Deeiborane--Skin........................ O-ttf Demeion -Skin.......................... DUeeuKW alcohol (4-hydrory- 4-methyl-2*penunone}.... 50 1,2-dlamifkoethaoe, see E thy leoedUus me.................. Diotometbane............................... 0.2 Diborane...... .................... .......... ai Dibutyl phosphate..................., i DiburvIphthaUte........ ......... ... -. `C Dlcnloroacetylen*.................. o: C o-Dichlorobroiene................. 50 p*Dichiorobenzene,. *............. . 75 Dichlofodifluoromethane._ 1,000 i,3*DichloroN5,5-dimnhyl hxdantoin................................. l.l-Dichioroethane..................... 100 l.i-Dichioroethvlene.................. 200 C Dtcnlorocihvt ethfr--Skin.. 15 Dichloromethane, see Methylenechlonde.................. Dichloromonofluoromethane.. . 1 COO C 1.1-Diehloro-l-miroethane.*,. 10 i.2*D)ch)oropropar>e. see Propylenedicblonde................. D ichlofoteiraftuoroethane___ , 1,000 Dichlorvos (DDYp)--Skin........ Dieidrin--Skin.............................. Dieihylamine.......................... 25 Diethylammo ethanol--Skm... 10 *`C Diethylene tnamme--Skin. 10 Dtethyinner, see Ethyl ether... Diftuorodibrocnomethane-........ 100 C Dieiycidyl ether (DOE)....... 0.5 Dihydforybeniene, see H y drop u won* *........................ Dusobutyi ketone..... ................ 50 PUsopropeiamme--Stem........... 5 Dimethoiymethane. see Methylal................................... Dimethyl acetamide--Skin....... 10 Dtmethylamme......................... 30 Dtmethylaminoben2ene, see XybOene...................................... DunethyianiUne(S*dimethyl- smlwej--Stem.................. ... Dtmethylbentene, see Xylene... Dimethyl 1.2-djbromo-2.2*di* chloroethyl phosphate, (Dib'om)............................ Dimeth'Mformamide--Stem..., 2.6-Diffletnymept.anon*, s** Dusoouiyl ketone. . i.l'Dimnnyihyprastne--Skiru.. a5 UrnifthyipfunaiaLfe................ Table G-I---Con, . * Substance p.p.m.* mg./M* * 3 0.3 M0 0.4 1.050 1 Q. 5 2*0 100 0.' 90 0.5 1 a: ai ai i i 15 6 245 5 1.050 200 200 1,015 200 10 1 0,3 0. 1 240 0. 4 0,1 5 5 04 300 450 4.950 0. 400 ;r-i yo 4.200 60 r.ooo 0.25 75 50 42 IS 290 20 35 IS 3 30 Dimethylsulfate^Slcin.... ___ 1 Dmitrobemene tall isomersi-- Skin................. ....................................... Dinitro-o-cresoi--Skin............ ............... Dinitrotoluene-Skm*............-- Dioxane (Dietnyiene dioxide)-- Skin............................................. 100 Diphenyl.........................- -- 0.2 Dtphenv) amine...,................................. Diphenyimethane dusocyan&te tsee Methylene bisohenyl isocyanate (MDH------- --.......-- Dipropyiene xlycol methyl ether--Stetn................................ 10Q Di-sec. octyl pftthalare (Di-2* ethylhejyiphthalate). .................... . 'Endosulfan (Thiodan <$)-- Skin...............................................-......... Endno--Skin.............--............ . Epiehiorhydnn--Skin, --..... 5 EPV-Skm................................... 1.2-Epor>*prooane, see Propyleneoxide..................... 2.3-Epoxy.i-propanol, see Glvctdol.............................. .. Ethanethioi, see EthyUner* captan..................... -- Ethanolamioe......... . --........... 3 2-Echoryetbanoi--Skin....... . 200 2*Ethoxye;hvlaoetate (Cello- sol ve acetate)--Skin................. 100 Ethyl acetate........................ Ethvl aery late--1Stew.................. 400 25 Ethyl alcohol (etnanol).............. 1,000 Ethylamme... --...................... 10 Ethyl sec-amyl ketone (5* mtthy l-3*heptanont).......... .. Ethyl benxene............................. Ethyl bromide............. 25 300 200 Ethyl butyl ketone (3Heptanone)............................ SO Ethyl chloride*............................ Ethyl ether... --. --........... . Ethyl formate...................-.......... Ethyl mercaptan,.,.................... Ethyl silicate......................... . Ethylene chlorohydrin--Skm.. 1,000 400 100 as 100 5 Ethylenedianune*........................ 10 Etnylene dibromide, see 1.2- Dibromoethane--*................. Ethrlene dichlonde, see 1,2' Dichloroethane..,.................... C Ethylene filycol umitrate and/or Xitrociycenn--Skm... * 0.2 Ethylene xlycol reonomethyl ether acetate, see Methyl ocllosolve acetate................... Ethylene imme--Skin................ Ethylene oxide...............-- Ethylene chloride, see 1.1* 0.5 50 Dichloro^thane.............. . N-Ethylmorpnohne--5 km........ Ferbam,.,............................ -- Ferroranadium dust............... -- 20 ......... Fluonde las F)............................. f luortne....................................... Fluorotrtchloromefhane----- l.onn Formic acid................................ Furfural--Skin................. Furfurv; aicohol.................. 5 5 50 Giycidol f2.3*Epoxy-ipropanou................... Givcol moncethyl ether, se 50 2-Ethoxv^ihanol,.......... Guthvon. vj) see Atwpnos- methyi...................................... Ralmurr,................................... Heptachlof--Skin...................... Heptane fn-hepiane)... Heiachiorocthane--Skin,. ... Hexachloronaphtnaleue--Skin.. 50n 1 Hexane ui-hexane)................. 2*Hesancne--. ......... ............. He..io.n..e..(.M..e..th..y.l..is..o.b.u..t.y.l....... sec*Hexyl acetate......................... Hydraiine--Skm........................ Hydrocen bromide................. C H ^drocen ch\onde_................. Hydroeen cyanide--Skm....... Hydropen peroxide..................... Hvdroeen selenxjf..................... 100 100 50 1 3 5 10 1 0.05 .H..y.d.r.o..q.u.i.f.tO..n..e................................................ Indium and compounds, as In.. C Iodine...... ........................ . Iron oxide fume.....*'-*-........ Iron salts, soluble, as Te....... .... Isoamvl acetate,....................... Isoamyl alcohol........................... lsomry! acetate.. -- *............. I?ohutvt alconol,. ...................... isopuorone..............................- *- * Itoprop) 1 acetate ........................ lsopropvi alcohol.......................... isopropylamme.......... ............... 10 0.1 100 100 150 JOO 25 2.vi 400 5 5 1 0. 2 15 360 1 10 600 5 0.1 0, l 19 0, 5 ( * ll i 6 *40 540 1,400 100 1,900 18 130 435 890 230 2.600 1,200 300 1 850 16 25 3 90 15 5 0 5, 600 i. 20 200 150 l I i as 0,5 ono 10 0.2 1,800 410 410 300 : 1.310 < u L4 as:-1 2 45 r~ ai.v, 1 10 1 525 360 700 300 140 Q50 9W 12 at ead of table. FEDERAL IEGISTEE. VOL. 36, NO. 105--SAnjIDAf, MAT 29, 1971 ucc 109525 RULES AND REGULATIONS 10505 Tabu G--I--Con. Tabu G-I--Con. Table G-I--Con. Substance p.pjn.* mg./M* Substanee p.p.m. mg,/M * Substance p.p.m,.* sag/M i 4 600 l?opropyUl7"<iyl th (IGE). 60 LKefaicdnatr-s-e-n-a-te--.-..-.-.*............".*....-.*.*."-- 0.6 Lindane--Skin.............. -........... Lithium nvdnde,..,.................. L T u. -.Loudied petroleum pas; 1, 0004 Macnestum oxide fume................. Maiattuon--Skin,................. Maleic anhydnde............. ,,........ q.25 C Manpanese and compounds. a,* Mn...... ......................... Mesityl oiide..........,........ `is'"" Metbaaethiol, see Methyl mercaptan................................... Methoxvchlor............................... 2-Methoxyethanol, see Methyl ceilosolve..,,............................... Methyl acetate............ 200 Methyl acetvlene (propyne)----- 1,000 Methvl acetyiene-propadieoe mixture (MAP Pi...................... Metr.vl scrvlate--Skin................ Methylai (dimethoirmethane) *. Nletnyi alcohol (methanol)......... 1.000 10 1.000 200 Methylaeine......... ,..................... Methvl amyl alcohol, see 10 Methvl isobatyl carbiool,.*..- Methyl isoamyl ketone.............. 100 Methyl (o*amyl) ketone (2- Heotanone)...... ..........,.......... . C Methyl bromide--Skin........... 100 20 Methyl butyl ketone, see 2- liexanone............. -- *............. .Methyl cellosolve--Skin.,.......... 25 Methyl cellosolve acetate--Skin Methyl chloroform____ MethyIcyclohexane ................ 25 350 500 Methylcydohexanol,................... 100 0-Methyicycloheianone-- Skin*. Methyl ethyl ketone (MEE), 100 see 2-Butahone............................. .Methyl formate-- Methyl iodide--Skin................... IX 5 Methyl isobutyl carbinol--Skin. 25 Methyl isobutyl ketone, see iiexonc.............. .......................... . Methyl isocyanate--Skin............ Methyl mercaptan..................... Methyl methacryiate................., 0.X 0.5 IX Methyl propyl ketone, see 2* fvnianone'.......................... *____ C Ma;i,\ i <ihcatc......................... < ` * Mrtnyl jftvrene*,........... 5 IX C Methylene bisohenyl taocyanate (MDI)..................... 0.X Moivudenum Soluble compounds.................... Insoluble compound*.............. Monomethvi aniline--Skin,.... ' M'-'.'niethvlhyi-atxne-- M.-- skin___ _________ 0,2 X 'toaltar;..,.................. Naphthalene...................... Vic tel carbonyl*,............. Nickel, metal and soluble * 4V'p-`*. a* Ni* ......................... IX 10 0. XI VN..lm i-.ti^.k..m...................... N.................. ;wSitrua".Mne--Skin,.......... *. Nit.-oboi* ne--Skin., p-Nitrr;r.lorotx`nrene--Skin"!*. N'ltfvw.aric.............. . Niirwvu dioxide...,___ in fluoride..,!!!!!!!!!! Nii roc!-.Term --Skin.!...........* Nuromethanc..,................!!!!!! 1-Nliropropanc..................,./! - N jtrnp-oaanc ................!!!!!. Vitrotoiuene--Skin...!!!!!!!!! Nltmincnloromcthanc. see t ___ _ ' " IX 5 10 o.: IX 25 25 5 O<rtrhnjron,phir!lcnc-^gfc]"n "Oc-anc,.................... *OL Bust, particulate......... <X ^:ut. ictroiidc. Oxalic and................ ! ....................... fiifluond'c............................... 0,05 ua` >kin 0.1 iiAiMc;jj.ids*sii-ui and aoiul'lr com" J'O'iiUh! nuoroocelatr (Vog/ivL. Mu. >ndiur f viirouUr * * : #M. /irr;u * .................... n. i" "U. U' itWlMl-'. %*d-u: l^uJluondr.. j5 V- :iI r]U] of r.-iblc. iioo 240 0.9 0.15 0,5 0.025 1.800 25 15 1 5 100 610 1,650 1.800 36 3.100 260 12 475 465 80 80 120 L 900 2.000 470 460 250 28 IX 0.06 1 410 X 480 0,2 6 26 9 0.35 70 400 so 0. XT 1 0,5 6 X 6 5 1 310 y 250 X 90 X 0,1 1*900 *5 0.002 1 01 0.2 0.5 0.01 0 05 1' U. 5 1 IX 0 15 13 6. X0 Sulfuric acid..................................... 1 Sulfur monochloride.................... V 6 Sulfur Dentafluonde.................... 0. 025 U. 25 Sulfuryl fluoride,......................... 5 X Systox, see Demeton ......... * -- 2.4.5T.................................................. 10 Tantalum.,........................ . 5 TEDP--Skin................................... 0.2 Tellurium.................................. .... 0. 1 Tellurium hexafluoride........ . o,: TEPP-Skin..................................... 0 05 C Terphenvis ............................. l,l,1.2*Tetrachloro-2,2-difluoro- etbane...................... ............. 500 4,170 1.1.2.2-Tetracnlorol.2^difluoroethane....... ................................ SOO 4.170 1.1.2.2-Tetrachloroe thane--Skin 5 35 Tetrachloroethyiene. see Per- chloroethylene..................... . Tetrachloromethane, see Carbon tetrachloride.................................. Tetrachloronaphthalene--Skin... Tetraethyl lead (as Pb)--Skm___ / 0 IX Tetrahydrofuran.... ........ M0 Tetramethyl lead (as Pb) -- Skin................................................. ft 150 Tetramethyl succinonurlle-- Skin............................................. as Tetranitromethant...... ............ i Tetryl (2.4.6-trmitrophenyl- methyimtramme)--Skin............. . 1,5 Thalbum (soluble com* pounds)--Skin as TL-,.............. 0.1 Thlram.......................................... 5 Tin (inoraamc empds, except SnH and SnOt)_________ ....... Tin (onramcempds).................... . al C Toluene-2,4-duaocyanate........ ax a 14 o-Toluidlne--Skin....................... 5 22 Toxtphene, see Chlorinated eamphene......................................... Trlbutyl phosphate.......................... 1.1.1-Trtchloroethane see Methyl chloroform................ ..... 1.1.2-Trichloroethane--Skin....... 45 Parathion--Skin............................. . 0. 1 Pentaborane...,........................... 0.005 aoi Peotachloro naphthalene--Skin.,.. Fentachiorophenol--Skin_............... 0. 5 0.5 pentane,..................................... 500 1,500 2-Pentanone................................ 200 700 Percftloromnhyl mercaptan___ 0.1 0,5 Perchloryl fluoride. *....... 3 115 phenol--Skin............................. . 5 V* p-pheny)ene diamine--Skin........... ai Phenyl ether (vapor)................... 1 Phenyl ether-bipheoyi mixture (vapor).,.................... pbenylethyiene. see Stvrene........... Phenylglycidyl ether (PGE)... 10 phenylhydratme--Skm,............ 5 phosdnn (.Mevinphos % )-- Skin................................................... al Phosyene (carbonyl chloride).. 0.1 04 phosphine................................... Phosphonc acid.............................. Phosphorus (yellow)........................ 0.3 0 i14 1 phosphorus peniachlonde......... 1 Phosphorus pentasulfide.................. i Phosphorus trichloride..... . 0.5 3 phthahe anhydride..................... 12 picric acid--5km............................... 0. 1 Pival $ (2-Pivaiyl-l.3- indandione)..................................... platinum (Soluble Salts) as Pc...................................................... 0. X2 Proparpyl alcohol--Skin........... n-Propyi acetate.............. *........... 200 840 Propyl alcohol.,,,........................ 200 500 n-Propyi nitrate....................... 25 no Propylene dichlonde................... 75 350 Propylene imine--Skm............... 2 5 Propylene oxide....................... 100 240 propync, see Methviacctvicuc.. *......... 6 Pyridine......................................... 5 15 Quinonc..... RDX-Skm.................................... 0,1 0, 4 1. 5 Rhodium, Metal fume and dusts, as Rh................................ 0. 1 Soluble salts..... .......................... 0 XI Ronncl....... ..................................... 10 Koicnone (commercial}..-.......... Selenium compounds (as Sr)..... 5 0. 2 Selenium hexafluoride............... 0.05 0.4 Tnchioromcthanr, sre Chloro form..... TnHiloronaphthalcm.'- 5km... 5 l,L',3-TnrhlorcpropaHC .......... SO 3oQ 1,1.2-Tnchloro l,24*trl!luoro* ethane................. . 1,000 7,600 Tnothylammr............................... 25 Id* TriflUOromOMouromoniri hone.., 1,000 6, IX 'Tnmethyl henxene................... 25 2.4.6-Trimtrophenol. see Pienc acid-,................................... -........ *........... 2.4.6-Trjnitrophenylinethyi. mtranunc. see Teiryl- *................ *......... Trinitrotoluene--Skill........................ . Tnorthocresyl phosphate................. Tnpneny! phosphate.................. --,-- Tunkscen and compounds, as \s: Soluble.................................... ................. Insoluble.--,.--.................... ................. Turpentine............................. . IX Uranium (natural) sol. and insol, compounds as U............................. C Vanadium: VjOidust........................................... . V0;fujnc................. .............................. Vinyl benzene, see Styrene......................... *C Vinyl chloride.................... 500 Vinylcyamdc, see Acrylonitrile................. Vinyl toluene..,........................... IX Warfarin....................................... .................. Xylene (xylol)......... .................... IX XvUdjnt--Skin............................ 5 Yttrium.................. ...................................... Zinc chloride fume.................. -- Zinc oxide fume............................................ Zirconium compounds (as Zr)................... 120 L5 0. I 3 5 560 0.5 0, I 1.3X 480 01 436 25 1 6 1970 Addition. Parts of vapor or gas per million parts of contami nated air bv volume at 25a C. and 76o mm He pressure. * Approximate milligrams ol particulate per cudic meter of air. (Vo footnote 4<c" is used to avoid confusion with ceiling value notations.) An atmospheric concentration of not more than 0 X p.p.ra., or personal protection may be necessary to avoid headache. * As sampled method that docs not cobect vapor. ' For control of geaeral room air, biologic monitoring is essential for personnel control. Table G-2 Benzene (237.4-1969)----------Beryllium *nd beryllium compound* (Z37.29-1970) Cadmium duet (as Cd) (Z37.5-1970) ......................... Cadmium fume (as Cd) (Z37.5-1970) ......................... Carbon disulfide <237,3- 1968) ........................................ Carbon tetrachloride '23747-1967) ....................... Ethvlene dibromide (Z37.31-197C) ....................... Ethylene dichloride (237,21*1969 > ....................... Formaldehyde (23746*1967) ....................... Hydrogen fluoride `(Z37J28-1969) ....................... Fluoride as dust (237,28-1966) ...................... Lead and its inorganic com* pounds (Z3~.l 1-1969) _ Methvl chloride (Z3748--1969) ....................... Methvlene chloride 1237^3*1969) ....................... Organo (alkyl) mercury (Z37.3Q-1969) ....................... Styrene (Z37.1S-1969)............ Tetrachloroethyiene (237.22-1967 \ ....................... Toluene (23742-1967).,*___ S^houT time tcer ghted overage 10 p p.m. 0.002 mg.. M'. 0.2 mg./M1. 0-1 mg. M:, 20 p.p.m. 10 p p.m 20 p.p.m. 5C p p =i. 3 p p.rr. 3 p p.m 2.5 mg. M . 0.2 mg /M1. 100 p.p.m. 500 p p.m 0.01 mg. M' 100 p.p.m. 100 p p.m, 200 p p.m Hvdroeen sulflde (237^-1966) ........................... Chromic acid and chro.maies (237.3*1971) ........................... Mercury (Z37,8-1971)________ Acceptable ceiling concentration 20 p p.m. 1 mg./ 10M' 1 mg.'lOM'. FEDERAL REGISTER, VOL. 36, NO. 105--SATURDAY, MAT 2?. 1971 ucc - 109526 10506 RULES AND REGULATIONS Table G-,i-Mineral 'Dvsts Substance Mppcf * Me/M 5 a. - `lahu.c Quartz 'respirable^............. 250 ' lOmg/M1 rtsiOH-5 f7>SiO:--2 Qisr.i total ou.'t'............... 30mp'.M: Cr:<:ncz\}:c Use1: the rain* from the L'ou;.; o' ma$ formulae for ouar:? Tnovrr.itc Use J*? tne value calculated from the for' --.ulac ''.un'-t: Amr>Thnu4 in- :udnic natural diaiomiiceous earth............... %SlO:-2 20 80ms,'M* T.-cs elite................................... TiSiO: 5 20mg'M 'less than IT crys- TcSiO: Ar''*<Tn*--U fibers per Thhhtcr greater than 5 microns m length or....... Mica..................-...........*........ Soapstone..........-.................... Tile......... ............................... i'ortnind cement.-- Orapnite t natural......... ,-- Coal 'rescraole fraction :ess maa 5T SiO:}.........-- For more than 57c SiO:...,-- n 20 20 20 50 15 2.4mg/M3 or 10xnc/M* Inert or Nuisance Dust; Respirabie fraction............... Total dust......... *................. %S10H-2 15 Smg/M1 50 lirag/M1 Note Conversion factors-- T.pncfX3.".3 million particle; per cubic meter -particle; per c.c, M.'.,o: panicle; per cubic fnot of air. bajed on nnnmcc- -ampic; counted by liahi*field technics. ` Tfr pf" , '[ticc nf evfialline silica In the formula i- v,': jiiviunt deteniiincd from air-borne samples, vept 1:1 tnosc instances in which other methoda have i- -ii'iw.i ;.i no applicable i_s ,i '-.i-rntined ny the membrane (liter method a: 43'> X nhasr contrast Thapiufi,'atlOh. Both concentration and percent nuarti for the application of this limit ate to be determined from the fraction passing a siae-seiector with the following characteristics: A'Toavna'wc diameter unit 'I-msi'v yphere) > 2.5 15 n ]<' Percent passing selector 90 75 50 25 r< The :n*2uror:'"nTs under this note refer to the use of i' Ar.f '.'.li'-u-nc'.-.: II the resPirahle fraction of coat nus: deierminM wji); a M RZ the figure correspondinc :o tr.at nf t vie Mi in the ta.nle for coal dust Is 4,5 Mc'.M: 1910,94 Ventilation. 13.' Abrasive blasting--(1) Defim. tions applicable to this paragraph--(i) Abrasive. A solid substance used in an abrasive blasting operation. iii Abrasive-blasting respirator. A continuous flow air-line respirator con structed so that it will cover the wearer's head. neck, and shouiders to protect him lram rebounding abrasive. (iiii B.ast cleaning barrel. A complete enclosure which rotates on an axis, or which has an internal moving tread to tumble the parts in order to expose vari ous surfaces of the parts of the action of an automatic blast spray. 'iv i Blest cleaning room. A complete enclosure m which blasting operations are performed and where the operator works inside of the room to operate the blasting nozzle and direct the flow of the abrasive material. (v) Blasting cabinet. An enclosure where the operator stands outside and operates the blasting nozzle through an opening or openings in the enclosure. <vi> - Clean air. Air of such purity that it will not cause harm or discomfort to an individual if it is inhaled for extended periods of tune. (mi) Dust collector. A device or com bination of devices for separating dust from the air handled 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 elements (a) enclosure or hood, (b) duct work, fc) dust collect ing equipment, (d) exhauster, and (e) discharge stack. ux) Particulate-filter respirator. An air purifying respirator, commonly re ferred to as a dust or a fume respirator, which removes most of the dust or fume from the air passing through the device. lx) 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 table. An enclosure where the pieces to be cleaned are positioned on a rotating table and are passed automatically through a series of blast sprays. (Xii) Abrasive blasting. The forcible application of an abrasive to a surface by pneumatic pressure, hydraulic pres sure. or centrifugal force. (2) Dust hazards from abrasive blast ing. (i) Abrasives and the surface coatings on the materials blasted are shattered and pulverized during blasting operations and the dust formed will con tain particles of respirable size. The com position and toxicity of the dust from these sources shall be considered in mak ing an evaluation of the potential health hazards. (ii) The concentration of respirabie dust or fume in the breathing zone of the abrasive-blasting operator or any other worker shall be kept below the levels specified in f 1910.93. > >iii) Organic abrasives which are com bustible shall be used only in automatic systems Where flammable or explosive dust mixtures may be present, the con struction of the equipment, including the exhaust system and all electric wiring shall conform to the requirements of American National Standard Installation of Blower and Exhaust Systems for Dust. Stock, and Vapor Removal or Conveying, 233.1-1961 (NTTA 91-1961), and .Amer ican National Standard National Elec trical Code. Cl-1968 (NFPA 70-1968'. The blast nozzle shall be bonded and grounded to prevent the buildup of static charges. Where flammable or explosive dust mixtures may be present, the abra sive blasting enclosure, the ducts, and the dust collector shall be constructed with loose panels or explosion venting areas located on sides away from any occupied area, to provide for pressure relief in case of explosion, following the principles set forth m the National Eire Protection Association Explosion Venting Guide. NFPA 68-1954. (3) Blast-cleaning enclosures. U) Blast-cleaning enclosures shall be ex haust ventilated in such a way that a continuous Inward flow of air will be maintained at all openings in the en closure, during the blasting operation. (a) All air inlets and access openings shall be baffled or so arranged that by the combmat'on of inward air flow and baf fling the escape of abrasive or dust par- ticules into an adjacent work area will be minimized and visible spurts of dust will not be observed. <b) The rate of exhaust shall be suf ficient to provide prompt clearance of the dust-laden air withm the enclosure after the cessation of blasting. (c) Before the enclosure is opened, the blast shall be turned off and the exhaust system shall be run for a sufficient period of time to remove the dusty air within the enclosure. <d) Safety glass protected by screen ing shall be used in observation windows, where hard deep-cutting abrasives are used. (e) Slit abrasive-resistant baffles shall be installed in multiple sets at all small access openings where dust might escape, and shall be inspected regularly and re placed when needed. 11) Doors shall be flanged and tight when closed. (2) Doors on blast-cleaning rooms shall be operable from both inside and outside, except that where there is a small operator access door, the large work access door may be closed or opened from the outside only. 1Exhaust ventilation systems. (1) The construction, installation, inspec tion, and maintenance of exhaust sys tems shill conform to the principles and requirements set forth in American Na tional Standard Fundamentals Govern ing the Design and Operation of Local Exhau't Systems. 29.2-1960, and ANSI 233.1-1961. a) When dust leaks are noted, re pairs shall be made as soon as possible. 'b' The static pressure drop at the exhaust ducts leading from the equip ment shall be checked whenxthe installa tion is completed and periodically there after to assure continued satisfactory operation Whenever an appreciable change in the pressure drop indicates a partial blockage, the system shall be cleaned and returned to normal operat ing condition. tii1 In installations where the abra sive is recirculated, the exhaust ventila tion system for the blasting enclosure shall not be relied upon for the removal' of fines from the spent abrasive instead of an abrasive separator An abrasive separator shall be provided for the purpose. -tt (ii:) The air exhausted from blast-" cleaning equipment shall be discharged, through dust collecting equipment. Durf- collectors shall be set up so that the atf j cumulated dust can be emptied and re-f moved without contaminating othffj working areas. "J <5) Personal protective equipment. (i)-j Only respiratory protective eouipmat, uccFEDERAL REGISTER, VOL. 36, NO. 105--SATURDAY, MAT 29, 1971 109527