Document 4vd4pOnYVx3EMemwYdB8K5x5e

FILE NAME: New York State & NY Times (NY) DATE: 1958 DOC#: NY095 DOCUMENT DESCRIPTION: Dept of Labor - Industrial Code Rule No. 12 Control of Air Contaminants in Factories CIAL SUPPLEMENT is, 3ssary, seats or benches with ' k- ''orking places and their reason- idequate capacity and furnished with the use of employees when meals are supply of cool, pure drinking water ise of a common drinking cup or of ust be dipped, is prohibited. number of water closets, chemical he scale set forth in Industrial Code I in a clean condition and located Is with running water or equivalent oilet rooms. They shall be supplied :ed. oe provided in which employees may for each employee shall be provided rea of two square feet per employee 3 where public or other transporta- ' til furnish safe transportation for f labor to travel to and from their mooth, without protruding nails or i and dry as the nature of the work platforms high enough to keep the f such platforms are not feasible, or all employees compelled to stand I h^wtmployees shall be adequately m eans. Adequate lighting for 's' foot candles of general illu- 1 interior spaces occupied by em'orway or other openings, by roof h or by any combination of these rranged and operated during all e air movement in all spaces occu11 be sufficient to maintain in all xceeding 80 F. of this rule or the application i is held invalid, such invalidity cations of this rule which can be ns or application, and to this end 1be severable. !p$<: DEPARTMENT OF LABOR 875 P I' Wl Industrial Code Rule No. 12-- Control of A ir Contaminants in Factories !(Formerly titled "Control of Air Contaminants" (page 713, twelfth supplement). Adopted as retitled and amended July 23, 1958; effec- " tive November 1, 1958; filed August 1, 1958. Statutory author ity 27-a, 28, 29, 200 and 299, Labor Law.) 12-1. Application. This rule applies in and to all factories in the state of New York except as otherwise provided by law and to all persons employed therein and to their employers in respect to all materials, proc esses and operations generating, releasing or disseminating a ir contami nants. In respect to contaminants resulting from such processes or opera tions the following rules, which contain references to the prevention and control of air contaminants, and other provisions of the Industrial Code in regard thereto which may be adopted after November 1, 1958, shall govern where inconsistent with this rule: Industrial Code Rule No. 4--Relating to Bakeries and Confection eries. Industrial Code Rule No. 10--Relating to Equipment, Maintenance and Sanitation of Foundries and the Control of Dust, Gases and Fumes in Foundries. Industrial Code Rule No. 11--Relating t,o Milling Industry and Malt Houses. Industrial Code Rule No. 23--Relating to Protection of Persons Employed in the Erection, Repair and Demolition of Buildings or . Structures. Industrial Code Rule No. 27--Relating to Construction, Equipment, Maintenance and Operation of Laundries. Industrial Code Rule No. 29--Relating to Dry Dyeing Plants and Dry Cleaning Plants. Industrial Code Rule No. 33--Relating to Control of Silica Dust in Rock Drilling. Industrial Code Rule No. 34--Relating to Control of Silica Dust in Stone Crushing Operations. Industrial Code Rule No. 35--Relating to Control of Silica Dust in Stone Cutting and Stone Finish ing Industry. Industrial Code Rule No. 38--Relating to Radiation Protection. The provisions of Industrial Code Rule No. 18 relating to exhaust sys $0 tems shall apply for operations not specifically covered by the above rules. M 12-2. Definitions. As used herein and m connection with this rule the following terras mean: 1. A xt coyitcLwiiYumta. Air-borne substances, such as dusts, fibres, fumes, gases, mists, vapors and other impurities. 2. Air mover. Any device which produces forced air flow, such as a fan, ejector, or natural draft stack. 3. Approved. In'respect to a device or material; in compliance with a subsisting resolution of approval adopted by the board; in respect to action by the board: made the subject of a resolution of approval. 4. Board. The Board of Standards and Appeals of the state of New York. 5. Commissioner. The industrial commissioner of the state of New York. 876 ^HIRTEENTH^FFICIALrsUT^EMiiNrr openings m the enclosure y natural ventilation through " d to preTM ` * ,, to t n i u r e f t e T i " " ^SployMs or c S S ' S "! ? ' " fl"" lilieil tending or in quantities greater than 50 percent nf^ho i 6 r exp,osion hazard, any m ature or compound which they may fom eXpIS1Ve levei * which r e d i f c e s ^ ^ uncontaminated air ^ l f ventilation eis by th e introduction of by JS " lri*' p d" `a " *" materia, in t h c f e S ' o n l E " 'SmPl1'' d: " wbp TMrks ^ *o or salary o ^ a T ' S S i n S r bP" a" " * " " T " io , oatM k lnr`SmU'`S' Appl,cali" "f l' <l" id material by permeation or d ? r i i r i S S i ! " ''i " " C" inS- Pai'" i"e " d Snishing o, 17. Local exhaust ventilation. A system of vpntiln+irvr, -e ,, a . removing a,r contaminants at the source of generation ? and rlL ^Z t A W 5` TM < ` S S n h av in g , p o w er. 'voices the use atmosphere. These operations i v ; , ru t d' ectly exposed to the work electroplating, . K S ' S K O . e l ' S ` I t i t t 1"?.1" l" g S P/ a ,, bj ^ t ' J r `,, S fduelviacmeCouon^tnsfooif-ali^rvcuornvtaomseina^nptsr ^ t f f i hgT T J t rareerr *frooimn ^bnahlTin gr hhatrhmer- op.ee oc'cCn`S "by S n J S e " 1"TM f parl or >" ' lk h .n o , eir to a n , | roll5r , & d * UOn 1,,Uid the fm n , tP * "taoe b y i r i traversed by an employee while ^ w o r k 3 r 8P` Ce nom,al[y occupied or in the course of pTrtorming h ^ T e ri^ 6 t0 wbleh aP emptoyee is exposed 12-3. Responsibility of employers. S f used to prevent air contamination or i s o i c r S S T in e n t i t i e s tending X x is r ^ S r s k ? .efsi o i MlrlaI pr0liuctE " " material eyed: one who work, for w ,ics or salarj, " t l m i n S " P" ` Une u" dE' "uTM uniting and continuing to hum ,,,1, am., t l.wi,,g eomb,,,tiog,, ,, S TM , o t' of liquid materia] by permeation or Painting and similar finishing of in- X S S for C0],6ctin* -ystern of ventilation having a power ' P,,e^atio ,wilich involves the use A resPinator or other nt.ng the wearer from inhaling harmL t r WithUt disturbi^ essential Part or all of the exhaust air to any vays mandatory. quid material in the form of a mist iquid material to a surface by brush,' area or space normally occupied or ^ere to which an employee is exposed pliance with the provisions of this al of air contaminants, the stor- wmi & DEPARTMENT OF LABOR 877 IgPfja&d. use of flammable liquids and the provision, installation, operation ^maintenance of control or protective equipment. ^ S ^ E v e r y employer shall instruct his employees as to the hazards of their fiptptkh, the use of the control or protective equipment, and their responsiIpfityvfot complying with this rule. g$3vNo employer shall suffer or permit an employee to work in a room there exist dangerous air contaminants in a work atmosphere ;P,;S?f'No employer shall suffer or permit dangerous air contaminants to l y si&fomulate or remain in any factory. Responsibility of employees. Every employee shall use the Pfjpplitiol and protective equipment provided for his protection and shall jigc&hply with all provisions of this rule relating to his personal conduct fef.;-'X2.5. Existing equipment. Control equipment installed prior to USSpyember 1> 1958 in accordance with the provisions of the industrial code Il'Sjt^en in effect and which is so maintained is exempt from all other or ftsWffprent provisions of this rule while such maintenance continues. 1^ 2 .6 . Prevention of air contamination. All operations producing air contaminants shall be so conducted that the generation, release or dis^semination of air contaminants is kept at the lowest practicable level. .IftLlqi any factory where the sources of air contamination are by reason of" ___Jgf'r-ifeei? extent, quantity or kind incapable of producing dangerous air con&* taminants, the provisions of this rule shall not apply. General maintenance of equipment. All equipment used to effect compliance with this rule shall be maintained in good condition and g in accordance with the requirements of the law and the industrial code. 12; 8> General control requirements. Dangerous air contaminants .shall be removed or controlled as prescribed in this rule. General control methods. One or more of the following methods VL ' shall be used to prevent, remove or control dangerous air contaminants: iifl& i-''- 4 Substitution of a material or a method which does not produce ^ ^ g f } ;dangerous air contaminants. 7 V' 2, Local exhaust ventilation conforming to the requirements of Indus ' ? ' trial Code Rule No. 18. " ' L- 3.- Dilution ventilation. 4. Application of water or other wetting agent. ; > . 5. Enclosure or isolation. ,6. Other methods approved by the board. 1 2 - 1 0 . Exhaust systems. Every exhaust system required by this rule shall be constructed, installed, operated and maintained in compliance with the provisions of Industrial Code Rule No. 18 relating to exhaust ' systems. " . 12- 11. Isolation or segregation of operations. All processes or opera tions releasing or disseminating dangerous air contaminants shall be isolated, enclosed or otherwise segregated insofar as practicable. 12- 1 2 . Separation of different processes creating a hazard. Where processes generate different air contaminants which could, if intermixed, result in a fire or explosion hazard, such contaminants shall be exhausted by separate systems so as to eliminate such possibility. 12-13. Prevention of ignition. All processes or operations using or generating air contaminants which constitute a fire or explosion hazard shall be protected from sources of accidental ignition. Unless such processes or operations are isolated by tight partitions or enclosures they shall not be conducted within 20 feet of any materials, devices or operations which produce flames or sparks including, by way of illustration but not by way of limitation, engines, motors, welding and soldering torches. All processes J m iw r.&jv i ^ v r r UiAij and operations within 20 fPOt n-t ` Vp, " " fTM cr A i T / e S ^ " spiratory protecli" - v b, se iS H iilP ! liiliiiip a ll is s f rn ^ m s m s s ^ r r" '-p" " " m u - sss, ,s L r a a s ^ i \ S s s s * ; iz -2 0 . Emptied containers Fmnticri " ventilation, not be stored indoors unless they have h ums or other containers hall f i i " " ?* dangerous^ i r^conta reinants^P f W ta v in " . * 2 % , 4 So In o r d i n a l . A p p a re n tl y should he respiratory" tiw 7 th e T a F>iabue SUPPLEMENT e< ^ ' all ignitible^irPcodlUCin-8' WOrk such 1 Jiable residue hall h a0Imarits' Aambazard before such work ^ b e ^ u T ^ frra proteciive equipment g m ' iethodJ, cep t^ o r p r o f f i S o f* " T?t be '.air, maintenance or S ! of+employees lfic approval by the boa^d. 1 * f equiP' codnt^amr^inean^t.aSTar^iasr^^su6^kstaShnac1e1obre lratry Prtective equipment raay be gg_ or cabPnetsor*in an^ncont qUi'P ent shaH deed and repaired J Z ltam)nated area, an be sterilized 'r l r ' f i u Z ^es, close-fitting Chem cal V1>ded With employee r e q u i r in g p S S n& r an vrk shall be suppliedwith* " SeS in t o o v e r his r e f f i crita^ToPn0oyre skinXd.0sSeed t0 a'r C0Dtamiamounts tend L t . f 68' r which csloerana,pprorontsecatsive c lith ins'r 3,uccfbi aasshcreoav]etrh-' cilities. Emergenev , Where Suitable- bodv members ,haliyh hWe^ 0r other ere employe provlded "ithin ,sive air contaminants PSed t0 Sudden grounded. A]] connprft,ih ?urpose j 'n SUCh areas sh^ be sh ie ld 'e d 'S n st flsmnisble Jicuirf^ 'te. id in unit quantities greater* thaif'SK i K c S j K f " " esse6; ' d' d . ilh s" h " T " " itl'in pi f b S " " " 2i ^ x ta r r!8 h " '' . . " A i haib?H" "' nePresrformed in daoo oorrss' Cr o,, mpresbseddoanier atory " DEPARTMENT OF LABOR 879 open cup test for paint removal or cleaning or any other process in which they are unprotected and exposed, shall be restricted to areas provided with mechanical ventilation creating an air movement of a t least 100 fpm over the surface of the work while the work is being carried on. The use of benzene for such operations is prohibited. A room in which such opera tions are being conducted shall comply with article 12-6. o f this rule. _12-22. Refuse material. In the vicinity of every process or opera tion to which this rule applies there shall be provided metal containers with self-closing covers and bearing the notice "flammable waste". Such containers shall be used for scrapings, sweepings and other waste con taining or consisting of flammable material. Such refuse shall be disposed of at the end of each day by burying, burning or other safe treatment but no such refuse shall be burned in a furnace. 12-23. Protection of adjacent occupancies. 12-23.1. Wall arid ceilirg construction. No employer shall suffer or per mit flammable liquids to be used or dispensed in any room above or below or adjoining one in which there is an employee occupancy unless either: 1. The room is part of a building which is a fireproof building or a fire-resisting building complying with Industrial Code Rule No. 7, or 2. The walls and ceiling of the room within 20 feet horizontally of'the working area are so constructed as to have a fire-resistance rating of at least one hour in accordance with Industrial Code Rule No. 7 and, if there be an employee occupancy below such room, the floor of the room within such distance is of incombustible material and is waterproof, or i 3. Such room is equipped with automatic sprinkler protection conform ing to Industrial Code Rule No, 20, 12-23.2. Wall openings. Wall openings in every such room shall be pro vided with approved three-quarter-hour self-closing fire doors or with approved three-quarter-hour fire windows, No such room shall have any window openings beneath or within 10 feet horizontally of any fire escape or required exterior stairway. 12-24. Specific operations and specific control requirements. 12-24.1. Grinding and polishing wheels, etc. Grinding, polishing, buffing, scratch-brushing, abrasive cutting-off wheel and grinding or polishing belt strap operations generating dangerous air contaminants shall be provided with local exhaust ventilation and an air-cleaning device. Exceptions: 1. Wet grinding with other than sandstone wheels and wet polishing and buffing operations if enclosures are provided which prevent splash or dispersion of liquids, abrasive compounds or mists into the workroom. 2. Intricate and precision grinding discs or wheels not over one inch in diameter. 3. Grinding or polishing of articles and instruments made of gold and platinum. 4. Intermittent tool grinding operations used for shop purposes only. 12-24.2. Woodworking machines. Woodworking operations generating dangerous air contaminants shall be provided with local exhaust ventilation and an air-cleaning device. 12-24.3. Melting apparatus. Vessels operated at or in excess of the temperature of volatilization of toxic metals, alloys or compounds which generate dangerous air contaminants shall be provided with local exhaust ventilation. Vessels used for melting or cleaning such metals, alloys or compounds shall be provided with exhaust ventilation when operated in auch a manner as to generate dangerous air contaminants. The combustion 880 'ex tar^1.'nan^ " half provid etTwjthTo^aF exEa ust ^ T dan^ o u s air Exception: Portable receptacles or ca` exhaust ventilation. air S i n aa n ts Sed ^ te n tly and ^ 1Z? ? .K ? ? en SUrfaC6 Unk ^ r a tio n s . ofaconted ,Dt f 0Ups in accordance w^tb both^ 6 ^ nk operatins are s 1t0 9ed ,ro *,, re," *e - * ' " i s w Js"uu"airiai Lode 12-24.4.4. Cleanout doors Tanks nr m r =$?**> aand haTM ilS S a surface Svapor a 3SS ^ 5S ea ofm T T d for cl^ in g by 1` Transfer of flammable solvents from ,, . bT vdz?, " r TM s f c c \ b,,r,!..x v i? " ? s s i y - < ** * * * * i r ir? " f(24 ? TM uncoverrf 12: l \ 4:6' Vapor Phase degreasing. m/ t'24'4'6'1' Ereeboard. The level of tv, flrlrt0P- l i ge f the ^ by a distance L nlPtrS t^ 11 be kept below tank width or 36 inches, whichever is less a t leaSt one-half the l*--24.4.6.2. Heating. ' chambea/ sh S ebreet ? h t ,, S e t " / f 0f ^ ` the combustion d.verters AH flues shall be constructed of cm ^ o n ^ 0^ W,th draft 2. Electric. Electric heating units sh a ll ,0S1n-resistant material, m is resistant to the tank contents Ind sh a ll v,Cnstructed of TMate- stalled so as to prevent hot spots d h be ^ tru c te d and in- *7 53 < p TM * * higher thanS20"Fe ,n ^ r o f t b i V o 0^ 6" 18 uncontaminated state and the other of wdifch^h0^ ^ 6 ,soIvent in its the vapor zone and'be adjusted to shut off tv, ba be located above the temperature in the zone of the therm VF source of heat when of the solvent. the therTM stat is at the boiling point or1c2.-c2,4i.04.i6.,4n. rCfoncdaencsoenrssW. iToa`nkSs shall h,, -- -- OFFICIAL SUPPLEMENT anner as to release dangerous air Wl"" ,ocal exhaust ventilation. ? nndd wwhhficchh lnprSo^duhc'eChnhoadI a6nngoerfoixuesd aloircactioonn- w -- DEPARTMENT OF LABOR 881 ` combination thereof located on at least two sides in th e upper portion of the tank above the solvent liquid level. Water, refrigerant or other cooling media shall be circulated through the condenser whenever the tank is in operation. oerations, ni?innaanntsTsshSalll bePepnroSvUirdJeadf wtaitnhkvePntoiltaiotionns (See Industrial Code Rule No 18 ) aann^cee vwSithh hboTth 1h"azar^dfnpkotePnetiraalaonnds raatree forth in article 18-14 of Industrial Code When heat is added to the workroom to hiliv7aPr evaPrated from open tanks hall be so controlled that it does not raise >e lower six feet of the workroom above anks or machines used for cleanino- Kr, ;apor area of more than two squa e^eet leanout or sludge doors located near the ch doors shall be constructed and main,e of solvent when closed. ee nbooot\ttoorTnno?fitnhhteaiIt,aenrkt l bheai,n!gbefilbleydmCeaonna sfer is being made shall be e le c tr iS w ustance of less than 25 ohms y be stored or transferred in uncovered sing. I f ^ o f the vapors shall be kept below lev., is lessUaI t0 &t leaSt ne' half the 12-24.4.7. Operation. 1. Where tanks are provided with loading hoists, the hoists shall be designed to raise and lower the work at a speed not greater than 11 feet per minute. 2. All products after immersion in solvents shall be held in the vapor I.'-. zone of the tank and shall not be withdrawn from the tank until the product reaches the vapor temperature as evidenced by the stopping of vapor condensation on the product. 3. Loading racks shall be of metal or equally impervious material. 4. Projected area of product or rack shall not be greater than twothirds the area of the tank. 12-24.4.8. Cleaning of tanks. 1. Before cleaning the interior of any tank, the contents shall be drained off and the cleanout doors, if any, shall be opened. All pockets in tanks or pits where vapors may collect shall be ventilated and cleared. 2. Every worker engaged in cleaning the interior of any tank in which dangerous air contaminants are present shall be provided with an ap proved air-line respirator or mask unless the work atmosphere is cleared of dangerous air contaminants by mechanical ventilation. A stand-by worker trained to render immediate assistance in an emergency shall be provided during the cleaning operation. 3. Floors and platforms around tanks shall be maintained in accord ance with Industrial Code Rale No. 16. 12-24.4.9. Welding, open flame, etc. No work involving welding, open flame or other sources of ignition shall be done at or about any equip ment for open surface tank operations unless such equipment has first been thoroughly cleaned of all flammable or volatile solvents and their vapors or is protected by distance or by shielding against accidental ignition or heating from such work. i s,,,,fuel fof heating, the combustion f ven'tn*?5a V 01- necessary combustion Y flues shall be independent TM f flr S( aha11 be Provided with draft : nnito ofvcri;o8ion-re8^tant material. . units shall be constructed of mate- sents and shall be constructed and in S tank shall be provided hich shall be connected to control or the KbCoiulintegntpso^ienatcohf athteenisPoelv^eantut rien niotst ftooers^hutf Womff thleShsaoUurbcee olofcahteeadt awbhevne 'he thermostat is at the boiling point :s shall be equipped with condensing if Pipes, coils, water jackets or any ' 12-24.4.10. Special precautions for cyanide. 1. Where rinse, acid and cyanide tanks are so installed and used that any of them may be contaminated with cyanide or acid, such tanks shall be provided with local exhaust ventilation. 2. Cyanide tanks shall not be provided with drains or overflows which will allow the tank contents to mix with liquid drained from other tanks either on the floor or in floor drains unless the cyanide drainage has been properly neutralized. 3. Cyanide salts shall be stored in a locked enclosure and set above the level of any floor on which acid carboys are stored. ,12-24.5. Tumbling processes. 12-24.5.1. General provisions. Tumbling processes creating dangerous air contaminants shall be provided with means to remove or control such contaminants at the point of generation. Exception: The above does not apply to mills, drums, cages or barrels which are completely enclosed during rotation and disseminate air ' ' contaminants only when being charged or discharged. Means shall be provided to control such contaminants. 882 THIRTEENTH OFFICIAL SUPPLEMENT 12-24.6. Abrasive blasting operations. 12-24.6.1. General provisions. Abrasive blasting cmeratinrv* f 7 1 r0)?l" r 11*11 be enclosed as complete?? PrVKl,,i W,ltl ` t o l * " to''r S / e ' E * ' ft"' ; " 1';?: Exception: Outdoor abrasive cleaning operations where the onProf s fumished with and wears an approved air-line respirator. P tor.'1 -24.6.2. Operation. Approved air-respiratory protective enninTY,^ * of the supplied air type shall be used by workers I m p K in . S blasting rooms or tunnels p yea m abrasive eh K c , TM "' A " i "rn " hed m pTM , 12-24.7. Crushing, milling, screening, mixing and conveying. | 12-24.7.1. General provisions. Crushing, milline- scrppnino- yy*; and conveying and related processes creating dangerous ai/o n n to '118 nants shall be enclosed and provided with local exhaust ventilation^ remove or control the air contaminants at the point of generation 12-24.8. Welding, brazing, flame cutting and metallizing. yy, \ 2'n 4'8'L General requirements. Welding, brazing, flame cutting sort metallizing operations creating dangerous air contam inant shall be Dro. v]ded with ventilation to control such contaminants, ^ 12-24.8.2. Classes of operations. Operations involving weldinc- etr> are divided into the following classes for the purposes of this ru le'1 " bbuuVt nnoo?t PlSimitePTd ttoin antimony, beryllium, cadmtoixuimc ,mleetaadls, imncelrucduirnvg 1 selenium or tellurium, or involving fluorine or any alloy, compound or flux containing any one or combination thereof or other danger ous air contaminants. "anger s ? ; ? 2 r i" , r t ,n `! metais' ^ ''3j - c ^ ,, d . p iTMiir n ,s r r fin' d ,p *c,` ip''olvi" K m *` Class IV. Operations in unconfined spaces involving metals, alloys or compounds listed in class II. ' y -t 1 12-24.8.3. Protection of operators. Clajs I requirements. Every employee required to work within a con fined space where any class I operation is performed shall be furn- 4 fth0e? aPProved a>r-Jine respirator or supplied-air helmet, and the confined space shall be ventilated at a minimum rate of 1000 c.f.m. per welder within the enclosure. % Class 11 requirem.ents. Every employee required to work within a con % fined space where any class II operation is performed shall be furnished an approved air-line respirator or supplied air helmet or the confined space shall be ventilated at a minimum rate of 1000 c.f.m. per welder within the enclosure. Class 111 requirements. Every class III operation shall be provided with local exhaust ventilation. Class IV requirements. Every class IV operation at a fixed location as part of a production process shall be provided with local exhaust ventilation where practicable. All other class IV operations shall be provided with dilution ventilation. O N C IA L SUPPLEMENT oeruiions. ns. Abrasive blasting operations creating aali be enclosed as completely as practicable ocal exhaust system to remove the air con- 5 leaning operations where the operator 's an approved air-line respirator, oved air-respiratory protective equipment be used by workers employed in abrasive urnished to air-line respiratory equipment -eening, mixing and conveying, is. Crushing, milling, screening, mixing ocesses creating dangerous air contamirovided w]th local exhaust ventilation to tammants at the point of generation. me cutting and metallizing, snts. Welding, brazing, flame cutting and : dangerous air contaminants shall be prool such contaminants. tons. Operations involving welding, etc. classes for the purposes of this rule: '' ed spaces involving toxic metals including beryl]iurn, cadmium, lead, mercury mvolving fluorine or any alloy, compound or combination thereof or other dang,er~ fined spaces involving metals, alloys or s e a t e d in class I. * 3i i spaces involving metals, alloys or mfined spaces involving metals, alloys or itors. employee required to work within a con i I operation is performed shall be fu rr ! respirator or supplied-air helmet, and : ventilated at a minimum rate of 1000 ie enclosure. employee required to work within a con tas II operation is performed shall be line respirator or supplied air helmet or ventilated at a minimum rate of 1000 e enclosure. ry class III operation shall be provided on. y class IV operation at a fixed location Jess shall be provided with local exhaust fie. All other class TV operations shall mtilation. DEPARTMENT OF LABOR 883 Exceptions' The class . the above requirements; operations are excepted from ''.I*'. Operations which are not usual shop practice, w* V'.'g'' Out-of-door operations, 12$f."xhaust gases from motor vehicles operating m enclosed areas. p , general provisions. Enclosed areas m which internal com- l*2.4i9.1. Jf operated and release dangerous air contami- n l S beprvided with means to remove or control the fumes, gases or feporS released or disseminated. Sha,, be conducted in a hood, bootlt! enclosure complyine with this role and ?" J ustrral Code Rule No 18 and-Drovided with a minimum air velocity of 100 feet per minute m tne ^breathing zone of any operator who works within the booth, o r a minimum Ive3 ? b f 100 feet per minute through all openings of any booth at which `the operator stands in front of the booth. ?Exception Downdraft systems of exhaust ventilation shall provide such ' an.air velocity as will prevent air contamination m the breathing zone of the operator. 19 mo frntina Units used for comfort heating any space t.o which *this2' ''a p p lie s in which flammable liquids are used handled or stored `shailhe confined to the use of low-pressure steam or hot water or indirect air Direct warm-air heating systems may be used subject |t"ropovan,y the board. Heating units shall be kept free of deposits of jbfrKi1"1! mm 0H , V Is YvL i flaS b3e CD r S T o f flammable liquid waste. Every drainage system which conducts flammable liquid wastes shall be provided with traps. Flamfmable liquid wastes shall be prevented from entering the plant drainage ! system. 12-25 4 Maintenance and operation. 12-25 4 1 Maintenance of equipment. All equipment required by this rule shall'be maintained in good repair and proper operating condition. 12-25 4 2 Purging. Exhaust systems shall continue in operation for a sufficient period of time after conclusion of coating operations to clear the air of dangerous air contaminants. , . ,, . ... 12-25 4 3 Floor maintenance. The floor within and in the immediate vicinity of 'the working area shall be kept clean and clear of any waste material or any obstruction. Where dust may be created by dry sweeping, floo shall be wet down with a nonflammable wetting agent before sweeping. ... , . 12-25.4.4. Passage space. A minimum passage space of three feet shall be provided for access to every working station. 19 9^45 Containers All tanks and containers used for flammable liquids shall be of incombustible material and shall be kept closed whether full or empty, except as may be necessary for operational purposes. ,, t Transfer of flammable liquids. The transfer of flammable U S h a ^ V a T / s h p o i n t of less than 100 desrees F shall be by TMas of a hose or pipe leading to the bottom of the vessel being filled. When transferring such liquids from one metal container to any other metal container the two containers shall be bonded together electrically and properly grounded. M' e str ' S l S or r 4 ee t hWhere diff6re^ MsiliP^EH"S iW s t d,, s ^ - . r - K ' S K K f f i `S be t UIdJ bode Rule prS " B i ? e" zeM " " rbon teirachi" ids f - >< p . t i . ,, ,. i d wv m n . . a i 5Wo, V,," " h" t y s tem rovidl" , v? S , " " " i" *" p s , r r ; : ,, ` ,` " "' S iP S ig : TM F " ,d d " ' " ' re'1" ,''s" " 1 " nTM protection, ,e , , ectio,, accidentai tipping. Hon ! tanks' Tanks a*iall be arranged to preeent 'i H I^ L SUPPLEMENT_______ not be taken into or out of spray power, unless the exhaust system is s of coating materials. Where different used in the same booth or apace, the ly cleaned of previous coating deposits on of the new substance. ' The mixing or thinning of flammable rr than.55 gallons shall be done in a ith ventilation as specified in Industrial ies, when mixed indoors, shall be mixed rking area provided with exhaust ven25.1. 1use of solvents. The process shall be 'entilation while the removal of residue being carried on. The rate of ventilahis article and Industrial Code Rule n tetrachloride for this operation is if surfaces containing lead or lead pigandpaper wetted with water or in an /stem providing ventilation at a miniathing zone of the worker. Flammable liquids used for cleaning loors in a working space shall have a Use of benzene for this operation is shall be used to clean floors. ind booths. Exhaust fans and the in shall be maintained free of accumula- A.^Jdaterial for lining of spray booths ' r ides of the booth or hood without ' .n contact with the walls of the Hbe removed or shall be reapplied to hanical application. Enclosed coating or solvent cleaning ying operations shall be mechanically tration of vapors within the enclosure ilosive limit. Necessary work openings ward air flow maintained by mechani- ks and troughs containing flammable perations shall be provided with heat h s arranged so as not to interfere ie dipping operation is done automatiul be provided with approved fire- :nts on fire protection, see section Tanks shall be arranged to prevent DEPARTMENT OF LADOR 885 12-25.5.4. Heating of liquids. Devices used for heating flammable liquids shall be provided with an automatic temperature-regulating de vice so arranged that the source of heat shall be automatically shut off when the temperature of the liquid rises above the normal operating temperature. 12-25.6. Forced drying and baking. , 12-25.6.1. Construction. Ovens, cabinets, other enclosures and duct work used for forced drying or baking systems shall be constructed of , incombustible material with expansion joints provided in th e oven fram ing. Duct work shall be provided with two inches clearance or threefourth inch of incombustible rigid insulation where the duct work passes through combustible walls, floors or roofs. The temperature of surfaces in contact with walls, floors or roofs shall not exceed 160 degrees F. The floor surface of the oven shall be of incombustible material and extend at least one foot beyond the oven outline. Interior surfaces shall be smooth. 12-25.6.2. Ventilation. Ovens, cabinets and other enclosures used for such purpose shall be provided with mechanical ventilation to maintain the concentration of flammable vapors below 50 percent of the lower explosive level at all times. Ovens shall be exhausted mechanically so that ; - . an inward air flow shall be maintained through all openings to prevent escape of dangerous air contaminants. The fans of such exhaust venti lating and any recirculating systems shall be interlocked to the heat supply by means of approved air flow switches so that the heat supply shall be cut off unless the fan maintains the required air flow. Conveyors shall be interlocked with the oven exhaust and any recirculating fans so that the conveyors cannot operate unless such fans a re operating. , When persons are required to enter the drying enclosure, the concen tration of air contaminants shall be maintained below the danger level . by mechanical ventilation. 12-25.6.3, Explosion vents. Ovens in which flammable vapors or com bustible gases may be present shall be equipped with explosion relief panels to relieve internal explosion pressures. Such vents shall provide an unobstructed aggregate area of one square foot of panel opening to each 15 cubic feet of oven volume, allowance being made for access openings and doors arranged to yield easily to internal pressure. Relief panels shall, if practicable, be located in the top of the enclosure and be made of material, other than glass, which shall easily yield to internal pressure. On long ovens explosion panels shall be distributed to provide effective explosion relief. Explosion panels shall be located and arranged so as not to create a hazard to employees or other work spaces. Panel edges shall be maintained free of condensate and other solid material to insure proper operation. 12-25.6.4. Controls. Fan switches shall be interlocked with the fuel ' valve through a time delay arrangement to assure proper preventilation before the fuel is ignited. Where necessary, enclosure doors shall have a limit switch interlock to prevent the time delay relay from operating unless the enclosure doors are open. The fuel supply line shall be provided with a pressure switch to shut off the fuel supply when fuel supply pressure is insufficient. The switch shall not reopen the fuel valve automatically. An excess temperature limit switch shall be provided to cut off the fuel supply when oven temperature exceeds the safe limit. The switch shall not reopen the fuel valve automatically. 886 THIRTEENTH OFFICIAL SUPPLEMENT . Combustion safeguards shall be provided to shut off the fuel surralv in the event of pilot light or ignition failure. pply ^ 1n`K5'6^5' DTMPers- ir supply or exhaust volume control dampers to pieven?3fUu f doPsurPee 7 ^ SeCUrely' Dampers sha11 be desi^ e d 12-25.6.6. Combination booths. Where coating and forced drvinc arP done alternately m the same booth or enclosure, the following reouire- ments shall be complied with : g require- a. During coating operations, the drying apparatus and electrical connections and wiring thereto shall not be located within the coatimr thei-TOn^antT ^ locatlon where coating residue may be deposited b. Coating apparatus, drying apparatus and ventilating system of the coating enclosure shall be equipped with suitable approved inter locks so arranged that coating apparatus cannot be operated while drying apparatus is inside the coating enclosure and the coating en- ( W .1-6 be Purged of coating vapors for a period of not less than three minutes before drying apparatus can be energized- the ventil ating system shall continue in operation during the drying'process and in the event of failure of the ventilating system, the drying apparatus shall shut off automatically, y g apparatus 12-25.6.7. Cleaning. The inside surfaces of the drying enclosure shall be maintained clean. Cleaning tools shall be of nonferrous material 12-25.7. Storage. 12-25.7.1. Enclosure of storage rooms. The floor surface of rooms used for storage of flammable liquids shall be of incombustible material and_ sha 1 be waterproof. The room enclosure shall be of construction Having the following minimum fire-resistive rating: Walls Doors Windows Ceiling (if space above is occupied) Floor 1 hour % hour % hour 1 hour 1 hour (For rules on fire-resistive construction see Industrial Code Rule No 7 .) 12-25.7 2 Location of storage rooms. Storage rooms for flammable liquids shall be located at or above grade and an exterior wall of the building shall form at least one wall of the room. No opening in any storage room shall he located within 15 feet of any stairway, elevator shaft or building exit. 12-25.7.3 Floor drai'm.ge and door sills. Floors of storage rooms shall be arranged to provide drainage of liquids and the drain shall be pro vided with a trap to prevent the spread of fire. Sills of noncombustible material at least six inches high or a six-inch deep gutter covered with grating shall be provided at every door leading into a storage room. Note: See section 12-25.3 for drainage requirements. oon2' 2n 7`4' (. quantities. No more than one day's supply or 220 gallons of flammable liquid, whichever is less shall be kept in a work- roora, Such supply, unless kept in closed drums, shall be kept in cabinets as follows: a. Cabinets for storing quantities of flammable liquid not exceeding n2 abaB be f at least incombustible single-wall construction and shall be vented to the outer air. TAL SUPPLEMENT U be provided to shut off the fuel supply nition failure. pply or exhaust volume control dampers fixed securely. Dampers shall be designed hs. Where coating and forced drying are >ooth or enclosure, the following require- ions, the drying apparatus and electrical ;to shall not be located within the coating 1 where coating residue may be deposited ing apparatus and ventilating system of >_e equipped with suitable approved intering apparatus cannot be operated while he coating enclosure and the coating enating vapors for a period of not less than apparatus can be energized; the ventiln operation during the drying process and ventilating system, the drying apparatus ide surfaces of the drying enclosure shall tools shall be of nonferrous material. ige rooms. The floor surface of rooms iquids shall be of incombustible material room enclosure shall be of construction i fire-resistive rating: 1 hour v ` 'C s occupied) % hour % hour 1 hour 1 hour truction see Industrial Code Rule No. 7.) e rooms. Storage rooms for flammable bove grade and an exterior wall of the e wall of the room. No opening in any vithin 15 feet of any stairway, elevator door sills. Floors of storage rooms shall e of liquids and the drain shall be proe spread of fire. Sills of noncombustible 3 or a six-inch deep gutter covered with ry door leading into a storage room, rainage requirements. tities. No more than one day's supply or whichever is less shall be kept in a workn closed drums, shall be kept in cabinets ntities of flammable liquid not exceeding t incombustible single-wall construction ;r air. DEPARTMENT OF LABOR 887 s?" h Cabinets for storing quantities of flammable liquid of more than ^ W ira llo n s but less than 220 gallons shall be of incombustible double- *^w all construction with an air space of at least one and one-half inches metal-covered wood construction throughout and shall be vented to outer air at top and bottom. , ,. , 0 ix. c. Quantities exceeding 220 gallons shall be kept in a storage room P lf'- as specified in paragraphs 12-25.7.1, 12-25.7.2 and 12-25.7.3. ISS&Yors t0 storage cabinets shall be kept closed and latched. 25 7 5 Container covers. Containers used for flammable or toxic fluids shall be kept covered tightly when not in use or when being moved ' Vut whether or not they contain such material. . , 12 25 7 6 Ventilation. Storage rooms shall be provided with a mim rate of ventilation of five cubic feet per minute per square foot cro ss floor area and the ventilation shall be maintained during trans- tf'r . mixing or thinning operations of quantities less than 55 gallons, 'iifdr quantities in excess of 55 gallons see paragraph 12-25.4.9. 12-25.8. Electrical equipment. -12 25 8 1 Wiring and equipment. All electrical wiring and electric * equipment shall be of good quality and properly installed Wiring within jij'O feet of a. working' area or within a storage room shall be installed in `'sealed rigid metal conduit with explosion-proof fittings. ^Exception: Coating operations not involving flammable solvents. 12-25.8.2. Lighting. Artificial lighting shall be by electricity. Lamps .-within areas where flammable liquids may be used or stored or where flammable vapors may be present shall be^ of the totally enclosed type 'A'and shall be protected against breakage either by location or by lamp : guards Lamp sockets shall be nonmetallic shells and of the switchless -yPe Illumination of hazardous areas through panels of transparent '.m aterial is permitted only under the following conditions: " 1 Fixed lighting units shall be used as the source of illumination. 2. The panel shall effectively isolate the hazardous area from the area in which the lighting unit is located. . i'-v '.. 3. The transparent panel shall conform to section 18-20.1 of code Vr'\:~ : rule No. 18. , , ,. ,, , , 4 The installation shall be such that the normal accumulation of hazardous residue on the exposed surface of the panel will not be raised to a dangerous temperature by heat radiation or conduction from the source of illumination. ' " . 12-25 8 3 Control equipment. Switches and other control devices, un . legs explosion proof, shall be located at least 10 feet from the working gy t'i ' area and outside of storage rooms. F;;VF . ' 12-25 8 4 Other equipment. All electrical equipment located in a stor- ,,..age room or tuhiec ijnihtecrniuoir uo*f coating h~o~o~d--s o--r their- exh-aust ducts shaU he explosion proof. Systems designed to salvage deposits by collecting .them in flammable solvent shall have the controls so arranged that the '.solvent pump cannot operate unless the ventilating fan is operating. ` 12-25.8.5. Grounding of equipment. All mechanical equipment used |;Li-r,y' , . for the application of flammable liquid and all metal booths, hoods, tanks, -troughs, conveyors, fans and motor housings and all belts within a work- L i l y , i n g area shall be grounded effectively. . -, . ,. 12-25.8.6, Electrostatic apparatus. The installation and use of electro- | 1- static apparatus shall comply with the applicable portions of this rule '.apd to the following requirements: ;s -------- ---------- ---- -------k ;i r6qUired' Dly aPPr Ved e]eCtrostati^ aPpara Th''S met;hd sbaJl not be used f01 S S a s - -- / ; ar-i2if-255e.88.66.88. ?AuptPomrtaetdicasco^ntmShtta i nt?^i be ?reeqquuiirreddVc7learrSanScheas!1 be 30 fT t0maHf C?ntro13 ar^nfed0?oatria k ?? 7 atUS sba,] be l a S aa K " i i j j i i * 12-25.8.6.9. Guarding Z d l o m J T V " if the <*veyor stops ~ / ences shau be of- **" ? gal] be P o ste/c 7 n 7 p ic tu s]f n e lrithne ^ f ingKihe Bp" ki"* distance s a r d s ' " to " i " ^ 5 ' i a a i ' s ^ i 2 ' V r 1 " ; : . 0' f c " E f El^ 12 1 Fdlr'fiht.,n& equipment. plsmber 1944* i=i=iSSaS:3is;=ss Not: For sprinkler system requirements see Industrial r,.j ,, , b. Hand d l p p l i " ,'S ," ^ 6' F^ipiAL SUPPLEMENT n ' - - Only approved electrostatic appara- atings. This method shall not be used for 5. ons. Manually operated spray guns or m an electrostatic field, ctrostatic apparatus and devices used in mg, dipping or other coating operations power packs located outside spray booths iect to paint deposit. ctrodes and electrostatic atomizing heads i permanently installed and shall be effec- ace shall be maintained between articles . electrostatic atomizing beads or conduc t i n g distance. iveyors. Articles on conveyors shall be so 3 maintain the required clearances. itrols. Electrostatic apparatus shall be trols arranged to make the entire equipl of the spraying area falls below that f Industrial Code Rule No. 18, or if too he conveyor, or if the conveyor stops. isolation of process. All parts of the 'tential and the electrical field shall be ff to provide safe isolation of the process. : of conducting material and shall be table sign stating the sparking distance J near the assembly. Signs designating is by reason of fire and accident hazard nsnlators shall meet the test standards 5r - potential used and shall be main- d by the board relating to the test re ar ?asLcally identical with the test C-29.1--September 1944 of the AmeriEngineers. it. A.n automatic sprinkler system with suffiwided in all working areas of buildings re flammable coating liquids are applied ements see Industrial Code Rule No. 20. rs. Dip tanks, drain boards, drip pans e of flammable liquids shall be provided iguishers except: finishing. h with their associated drain boards, i a vapor surface area not greater than 'here shall be provided adjacent to the exit from the room in which flammable DEPARTMENT OF LABOR 889 pA jauids are being applied or stored at least one hand fire extinguisher ftfelDPTOved for the control of flammable liquid fires. Extinguishers containing ^Pehrbon tetrachloride, methyl bromide or other toxic materia! a re prohibited I f % r this usage. In addition there shall be at least one approved extinguisher "ft&for each 2,500 square feet of floor area so located that a person shall not J'S m v e to travel more than 50 feet to reach the nearest extinguisher. Ex, ''tibguishers shall be easily accessible and protected from injury. g if"! 12-27. Evidence of dangerous air contaminants. The existence of air | `bntaroinants consisting of or deriving from the substances named in the following table in relative quantities greater than those s e t forth as to each substance shall constitute prima facie evidence that such contami- 'fe'nants are dangerous air contaminants. Prima facie evidence as to whether p tf y other air contaminants or lesser concentrations than those se t forth in the llliLfflowing table constitute dangerous air contaminants by reason of their ffiii$i-?existence in quantities tending to injure the health of employees shall b.id jn'clude an opinion by a physician to that effect as a matter of sound clinical I BA judgment. iSfH 7'-'. Gases and IMt-:-. A- i:_Substance mmN*:?'Acetaldehyde .Acetic acid Acetic anhydride m Acetone life Acrolein # f Acrylonitrile MA'flyl alcohol -MbsS|Aflyl propyl disulfide m e Ammonia SAxnyl acetate Ill Amyl alcohol (isoamyl Aniline Arsine Parts per Million 200 10 5 1000 0.5 20 5 2 100 200 alcohol) 100 5 0.05 Benzene (benzol) -Benzyl chloride Bromine Butadiene Butanone ; (methyl ethyl ketone) Butyl acetate 1Butyl alcohol Butyl amine , Butyl cellosolve Butyl mercaptan 25 1 1 1000 250 200 100 5 200 10 : Carbon dioxide Carbon disulfide Carbon monoxide 1Carbon tetrachloride Cellosolve Cellosolve acetate Chlorine Chlorine trifluoride Vapors A. Substance Parts per M h on Chlorobenzene (monochlorobenzene) 75 Chloroform 100 1-Chloro -1- nitropropane 20 Chloroprene 25 Cresol (all isomers) 5 Cyclohexane 400 Cyclohexanol 100 Cyclohexanone 100 Cyclohexene 400 Cyclopropane 400 Diacetone alcohol Diboranc o-Dich!orobenzene Dichlorodifluoromethane 1, 1-Dichloroethane 1, 2-Dichloroethylene Dichloroethyl ether Dichloromonofluoromethane 1, l-Dich!oro -1- nitroethane Dichlorotetrafluoroethane Diethylamine Difluorodibromomethane Diisobutyl ketone Dimethylaniline Dimethylsulfate Dioxane (diethvlene dioxide) 50 0.1 50 1000 100 200 15 1000 10 1000 25 100 50 5 1 100 Ethyl acetate 400 Ethyl alcohol (ethanol) 1000 Etbylamine 25 Ethyl benzene 200 Ethyl bromide 200 A. Substance r Ethy] chloride if Ethyl ether Ethyl formate [K, mercaptan Ethyl silicate j ^ ylel,e ch]orohydrin Ethylene diamine %isl ene ^'bromide Ethy ene dichloride Ethylene imine Ethylene oxide Fluorine Fluorotrichloromethane Fonnaldehyde Furfural Furfuryl alcohol Gasoline Heptane Hexane Hexanone Hexone Hydrazine Hydrogen bromide Hydrogen chloride Hydrogen cyanide Hydrogen fluoride Hydrogen peroxide Hydrogen selenide Hydrogen sulfide Iodine Isophorone Isopropylamine Mesityl oxide Methyl acetate Methyl acetylene Methyl alcohol Methyl bromide MethyJ l <ce-cllioiosaooJjve c!losoIve acetate Methyl chloride Methyl isobutyl carbinol MMqeIthkyl meracmapyItaanlchol) Methylal " "> MMeetthhyyl cfyocrlmohaetexanone Methylene chloride Parts per Million 1000 400 100 250 100 5 10 25 100 5 100 0.1 1000 5 5 200 500 500 500 100 100 1 5 5 10 3 1 0.05 20 1 25 5 50 200 1000 200 20 25 25 1nA A. Substance (coal tar) Nv ticukte}liacarfbPoentyrloleum) P-Nitroaniline Nitrobenzene Nitroethane Nitrogen dioxide Nitroglycerin Nitromethane 2-Nitropropane Wurotoluene Octane Ozone Pentane Pe"n'"t"an`loine Parts per Million 200 0.050010 11 100 5 0.5 100 50 5 500 0.1 1000 200 - Phenylhydrazine rto" E V carbon>,i chl"ri*> 1 Propyl alcohol (isopropyl alcohol) Propyl ether (isopropyl ether) Propy ene dichloride Propylene imine Pyridine Quinone Stibine Stoddard solvent Styrene monomer (Phenyl ethylene) Sulfur dioxide Sulfur hexafluoride Sulfur monochloride Sulfur pentafluoride 200 400 ,-nA 52 75 25 ^ ^ 500 2nn 10TM 100 0 025 25 r ? 2 ia?^b,Utyl t0luene ' 10 50 Tetmhydrofura'n r ethane 2n5 Ttoeltureannei t r o m e t h a n e 2 0t, o-Toluidine 200 Trichloroethylene 2J jon TM S z r brTM TM TM >0* 5^ Viay, chloride (chloroetheao, 5o"o" * s o In riirim . A p p a re n tIy , hould ^ ,,N a i) h t ia ,. 200 FIHAL SUPPLEMENT sr - A. Substance Naptha* (coal tar) Naptha* (petroleum) Nickel carbonyl p-Nitroaniline Nitrobenzene Nitroetbane Nitrogen dioxide Nitroglycerin Nitromethane 2-Nitropropane Nitrotoluene Parts per M illion Octane Ozone Pentane Pen tanone Perchloromethyl mercaptan Perchlorethylene Phenol Phenylhydrazine Phosgene (carbonyl chloride) Phosphine Phosphorus trichloride Propyl acetate Propyl alcohol (isopropyl alcohol) 400 Propyl ether (isopropyl ether) 500 Propylene dichloride 75 Propylene mine 25 Pyridine 10 nnone 0.1 Jbine 0.1 Stoddard solvent 500 Styrene monomer (phenyl ethylene) Sulfur dioxide Sulfur hexafluoride Sulfur monochloride Sulfur pentafluoride 200 10 1000 1 0.025 P-Tertiary butyl toluene 1. 1, 2, 2 Tetrachloroetbane Tetrahydrofuran Tetranitromethane Toluene o-Toluidine Trichloroethylene Trifluoromonobromomethane Turpentine 10 5 200 1 200 5 200 1000 100 Vinyl chloride (chloroethene) 500 Xylene 200 M 1T1-________ _ _ DEPARTMENT OF LABOR 891 M a,- te i' - B. {M^ubstance Toxic Dusts, Fumes and Mists Milligrams per Cubic Meter B. Substance Milligrams ver Cubic Meter ikri' Aldrin 0.25 flfl'^tAnmate 15 Antimony 0.5 Arsenic 0.5 Barium (soluble compounds) 0.5 ,, Cadmium 0.1 Calcium arsenate 0.3 Mordane 2 Qhlonnated djphenyl oxide 0.5 Chlorodiphenyl 1 SiV Ubromic acid and chromtes as CrO 0.1 " Grag herbicide 15 Cyanide as CN 5 2, 4-D (2, 4-dichlorophenoxy- acetic acid) 10 DPT (2, 2- bis- (p-chlorophenyl 1, 1, 1-trichlorethane) ) .Dieldrin Dinitrotoluene 1 0.25 1.5 - -Dinitro-o-cresol 0.2 - PN (ethyl-p-nitrophenyl thiono benzene phosphonate) 0.5 Ferro vanadium dust 1 Fluoride 2.5 Hydroquinone 2 Iron oxide fume 15 Malathon 15 Manganese 6 Mercury 0.1 Methoxychlor 15 Molybdenum (soluble compounds) 5 Molybdenum (insoluble compounds) 15 Organo mercurials (as mercury) 0.01 Parathion 0.1 Pentachloronaphthalene 0.5 Pentachlorophenol 0.5 Phosphorus (yellow) 0.1 Phosphorus pentachloride1 1 Phosphorus pentasulfide 1 Picric acid o 1 Selenium compounds (as Se) 0 1 Sodium hydroxide 2 Sulfuric acid i TEDP (tetraethyl dithiono pyrophosphate) 0.2 Tellurium o.l TEPP (tetraethyl pyrophosphate) 0.05 Tetryl (2, 4. 6-trinitro- pbenylmethylnitramine) 1.5 Titanium dioxide 15 Trichloronaphthalene 5 Trinitrotoluene 1.5 Lead Lead arsenate Lindane 0.20 Vanadium (V,0. dust) 0.5 0.2 Vanadium (V.O. fume) 0.1 0.5 Magnesium oxide fume Zinc oxide fume (as Zn) 15 15 Zirconium 5 -.'/y.:-' >f ' > - -r: !r-&: v'l"'*' '>y ' s; b^ ` Asbestos 1f t ' % Z Ver Cubic Foot* P S ^ 1 1 u" : a f t M ^ r o o ^ S ::8'0'1 i Total dust (below 5% free SiO ^ 20 a s^ ftS ? nW * dlow .;L method f 50 12-28 'A ; " dUSt`Sa^ ' e- U1Vaiem m Stn^ r ^ ft nf t t f t b" r t8riai - :- f tu a $ $ a t sgss $ ? & $ 3 2 p -,,,,, * ,,, * s is t o k it a i t f Industrial Code R ule N ,, 7 f l Z f t n , In s p e c tio n a n d M a i,, ,e n a n c e o T s ^ O\ Inn a0` Uo f 4'5, Qualification and mm * team B oilers fed N o U t r T / S the industrial corrmii- &S 3? InsPector of steam h u' a cert,'ficate of cor the employ of insur.m oner to PeTMons at leas? mlers shal! be issued | nation as' to ihe?r ^ J T PaJ]ies' wb s u S f u , , ^ " of a^e who are i tenance of steam boilers a jifth ^ the COnstructin insTalln^ 1'1" 011 exam examinations must have hi!?*h T appurtenances r " i ' i rt,on and mair >n boilermakin" boS?r1,,h tdnfiv? years of P n a S l S f cdates tekini? sue or operation and rnaintm ^ at'rn and inspection nr^ ? ^ 017 exPen'enc in proportion to its value be f steara biiers. Technics er ,sh P practl to exceed two year* Sn!m ' b g,ven credit as eoui education shall Pftft board appointed by the^nftXai? 'nations shall be conduct V u experience no of one representative of eachna! r mis8io ^ S " aminin* facturers, insurance c o m n a S f he lo w in g - interest \,be COIriposec spection of the D e p a r f c S c ?perat`ng engineer?R boiJer manu- commissioner may designate. Ubor and ^ c h othe a" "^ S & J i