Document yk249Kje9gMNMa5mQNa4q7jDD

State of New York . DEPARTMENT OF STATE i IT IS HEREBY CERTIFIED, that the attached i s a tru e copy o f In d u strial Code Rule No. 12 as f i l e d w ith the New York S t a te Department o f S ta te on a d / A v U e d cv> \ o a o 'H l z o a \ v 130-1 ~~ l^ufjfstxial Code R ule No. 12-- R em oval of Dust, -- _^(iases and Fumes Industrial Code Rule No. 12, as retiflcrl-and^redesignated May 12, 1054 and tiled May 13, 1954 {pagcs_.535 -an'd 536, tenth supplement), repealed June 21, 1956; cifecUyg_JJetoboir "l, 1956; filed August 7, 1956. Statutory, authority $_22-ay2S7"29j200 and 299, Labor Lav. Industrial Code Rule No. 12-- Control of Air Contaminants (Adopted June 21, 1956; effective October 1, 1956; filed August 7, 1956. Statutory authority {) 27-a, 2S, 29, 200 and 299, Labor Law) 12-1. Application. This rule applies to all processes and operations releas ing or disseminating air contaminants in any workroom or work spare except such processes or operations as are within the application of: Industrial Code Rule No. 4--Relating to Bakeries and Confec tioneries. Industrial Code Rule No. 11--Relating to Milling Industry and Malt House Elevators. Industrial Code Rule No. 23--Rule Relating to Protection of Persons Employed in the Erec tion, Repair and Demolition of Buildings or Structures. Industrial Code Rule No. 27--Relating to Construction, Equip ment, Maintenance and Opera tion of Laundries. Industrial Code Rule No. 29--Relating to Dry Dyeing P lants and Dry Cleaning Plants. Industrial Code Rule No. 32-- Relating to Spray Coating of Mo tor Vehicles. 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 F in ishing Industry. Industrial Code Rule No. 38--Relating to Radiation Protection. I t applies also to all employees engaged in such processes or operations and to their employers. 12-2. Responsibility of employers. Every employer shall ohserve and effeci compliance with the provisions of this rule relating to prevention of air con tamination and to providing, installing, operating and maintaining control or protective equipment, and shall instruct his employees as to the hazards of their work, the use of such control or protective equipment and their responsibility for complying with this rule. 1 2-3, Responsibility of employees. Every employee shall use the control and protective equipment provided for his protection. 12-4. Existing equipment. Control equipment installed prior to October I. I95C in accordance with the provisions of the law and the industrial code then' in effect, and which is so maintained, is exempt from all other or different provisions'of this rule while such maintenance continues. 12-5. Plana and specifications. 1. Upon the filing: of plans and specifica tions for the installation or extension of any ventilating system pursuant to an order of the commissioner issued under section 299 subdivision fi> of the l-ahor Law, such plans and specifications shall be tiled in triplicate together with such other information as the commissioner may require for his examination and acceptance. 2. Any employer subject to this rule, or his authorized agent, may if he so desires submit to the commissioner for his examination and recommendations the plans and specifications of any air contaminant control method or apparatus. I f such plans are submitted, they shall be submitted in triplicate with three copies of all specifications necessary to provide complete details on the location and size of all hoods, mains, branch ducts, fans, motors and other apparatus and the kind of work for which they, arc to be used. Upon receipt of such plans and specifications the commissioner shall examine the same and make sueh recommendations as may be indicated. 12- 6, Definitions. As used herein or in connection with this rule'the fol lowing terms mean: 1. Abbreviation!;. c.f.ra.--cubic feet per minute, f.p.m.--feet per minute. . 2. Abrasive blasting operation. The process of blasting metal or other materials by means of abrasive for the purpose of remov ing sand, rust, scale, paint or other substances; or to produce certain etches or finishes; or otherwise to .change the physical characteristics of the material.' 3. Acceptable. In compliance with the spirit and: intent of this rule, and after inspection by the commissioner, satisfactory to him as so complying. 4- A tr cleaning device. Any device for separating the air contami nants from air which has been collected through an exhaust . system. 5. Air contaminants. Air-borne suhstances such as dusts, fibres. fumes, gases, mists, vapors or other impurities. 6. Air mover. Any device which produces forced air flow, such as a fan, ejector, natural draft stack and the like. 7. 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 reso lution of approval. 8. Board. The Board of Standards and Appeals of the state of Xew York. 9. Branch pipe. The connection from a hood, booth; o r 'enclosure to its first junction with another pipe. 10. Commissioner. The industrial, commissioner of the state of N"ew York. 11. Confined space. Interior of tanks, boilers and other unventilated spaces. 12. Control equipment. Any equipment used to prevent air contami nation or reduce or remove air contaminants. 13. Dangerous air contaminants. Air contaminants in quantities tending to injure the health of employees or create a substantial fire or explosion hazard. 14. Dilution ventilation. Any ventilation system other than local exhaust ventilation. 15- Exhaust system. A ventilating system operating unde.r negative pressure for the control of air contaminants. l i i l l ' A k T M K N T i >!' I.AlUiK 1G. Fibres. Particles produced by handling, cutting, stripping, spin ning or weaving of cotton, wool, fur, asbestos or other organic or inorganic material constituted of thread-like or slender ele m ents. . 17. Local exhaust ventilation. Any system of ventilation for exhaust ing air contaminants at the souree of generation. IS. Main. Pipes nr duets which extend directly from the air mover arid to which hranch ducts or pipes arc connected. 19. Mechanical ventilation. Any system designed to- introduce air into or remove air frotn any workroom or space by means of an air mover. JO. Open surface tank operation. Any operation involving the im mersion of materials into liquids or vapors of liquids for the purpose of cleaning or altering the surface character, the sub sequent removal from the liquid or vapor and the draining and drying of such materials, e;g., washing, electroplating, anodiz ing, pickling, quenching, dyeing, tanning, dressing, bleaching, degreasing, alkaline cleaning, stripping, etc. 23. Personal respiratory protective equipment. A respirator or other device worn for the purpose of preventing the wearer from inhaling harmful amounts of air contaminants. 22. Practicable. Capable of being done without disturbing essential associated functions or structural elements. 23. Recirculation. The return of part or all of the exhaust air to any space occupied by employees. 24. Shall. The word "shall"' is always mandatory. 25. Tumbling process. Any process in which articles, pieces or parts are placed in a rotating barrel, drum, mill or cage for the purpose of removal of rust, scale, debris or dust as well as for the purpose of smoothing, polishing, burnishing or cleaning by- means of agitation. 12-7. Prevention, All processes and operations where practicable shall be so conducted or controlled as to prevent avoidable creation of air contami nants. 12-3. General control requirements. Dangerous air contaminants shall be removed or vnulrollrd a.- pro.-eriboi! in lliis rule nr by menus or owllmds ap proved by the board. 12-9. General control methods. One or more of the following methods shali.be used to prevent, remove, or control dangerous air contaminants: 1. Substitution of a material which does not produce air contaminants; 2. Local exhaust ventilation at the source of generation of the nir con taminant ; 3. Dilution ventilation in any work space in which air contaminants are generated or released; 4. Application of water or other wetting agent to prevent air contami nants; 5. Other methods approved by the hoard. 12-10. Specific control requirements. 12-10.1. Grinding and polishing wheels, etc. Grinding, polishing, buffiing, scratch-brushing, operations arid in abrasive cutting-off wheel ar.d grinding or polishing bell strap operations generating dangerous air contaminants shall be provided with local exhaust ventilation and an air-cleaning device. Exceptions: 1. Wet grinding, with other lhan sand stone wheels and wet polishing and bitfling operations if enclosures are provided which prevent splash nr dispersion of liquids, abrakivn compounds or m:.-ts irilu the workroom. 2. Intricate and precision grinding discs or wheels not over onu inch in diameter. 3. Grinding or polishing of articles and instruments mu.de of gold and platinum. 4. Intermittent tool grinding operations used for shop purposes only. 12-10.2. Woodworking machines. Woodworking operations generating dangerous air contaminants shall he provided with local exhaust ventilation and an air-cleaning device. 12-10.3. Miscellaneous machines. The following machines, apparatus, op erations or equipment generating dangerous air contaminants shall be con trolled as provided in article 12-9: , '* .1. Cutting, sanding, dressing, polishing, buffing, snagging or similar operations on plastics, leather, glass, rubber, mothcr-of-pearl, ivory, nuts,' and like material. 2. Picking or garnetting fibrous substances or shoddies. 12-10.4. Melting apparatus. Vessels operated at or in excess of the tem perature of volitilization* of such metals, alloys or compounds as antimony, beryllium, cadmium, lead, selenium or tellurium, together with the combus tion chamber, which generate dangerous air contaminants shall be provided with local exhaust ventilation. Vessels used for melting or cleaning such metals, alloys or compounds together with the combustion chamber shall.be provided with local exhaust ventilation when operated, in such a manner as to generate dangerous air contaminants. Exception: '. Portable receptacles or apparatus which have no fixed location. 12-11. Operation and maintenance. 12-11.1. Operation. Control equipment shall be operated in conformity with this rule. 12-11.2; Repair and cleaning. Control equipment and cleaning devices shall be maintained in good repair and dean condition and be'so located as to afford ready ana safe access for servicing. The machinery; equipment,, and working area shall be kept in a clean and orderly condition with.all Unnec essary dust, spillage and debris removed at frequent intervals so as to main tain good housekeeping. 12-11.3. Grounding. Control equipment including hoods, ducts, air mov ers, motors, and cleaning devices, which is used.for exhausting any material which constitutes a fire or explosion hazard shall be effectively grounded elec trically. Resistance to ground shall not exceed 23 ohms. 12-12. Isolation or segregation of operations.'All processes or operations releasing or disseminating dangerous air contaminants, shall be isolated, er- closed or otherwise segregated insofar as practicable. A 12-13. Separation of different processes creating a hazard. 12-13.1. Separate exhaust systems. "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. 12-13.2. Ignition. Processes or operations using or generating air con taminants which may constitute a fire or explosion hazard shall be protected from sources of ignition. r 12-14. Personal respiratory protective equipment. 12-14.1. Use. Personal respiratory protective equipment shall not be used in lieu of other control methods, except for protection of employees in emer- So m o riginal. A pparently should be Mvolarlixatum" .' n i : r \ i; t m i ..\ ; u-' i. vin *t,- ri7 gcncics an d m tin 1 re p a ir, :m;t i t i t e r a d ju stm in t ui" equipm ent o r proc esses, or upon specific approval by tbe hoard. 12-14.2. A /irural. Pi rsonul respiratory protective equipment shall be of a type approved by the hoard tor tin; particular class of substance or sub- stanees constituting tin1 air contaminant. 12-14.3. , M ninlnunw . Personal respiratory protective equipment sliall bo stored in air-tight eonlaitiers or cabinets or in an uorontaMiinated area. Fquipnient shall be cleaned, serviced and tepaired to maintain it in effective work ing condition and it shall be .sterilized before use by any person other than the last wearer. 12-15. Goggles, masks and shields. .All employees exposed to air contami nants tending to injure or irritate the eyes shall be provided with and shall wear either safety goggles, close-fitting chemical goggles or an effective face mask or shield. An employee requiring prescription lenses in the normal perform ance of his work, shall be supplied wirh goggles designed to fit over his regular spectacles or prescription goggles shall be provided in lieu of the foregoing. .1 2 -1 6 . Protective clothing. All employees exposed to air contaminants which tend to cause skin irritation or skin diseases, or which can bo absorbed through the skin in amounts tending to injure the health, shall be provided with appropriate clean, protective clothing, such as coveralls, coats, headgear, gloves, sleeves o r aprons as needed or where suitable, or skin-protoctive preparations. 12-17. Sanitary facilities. Proper facilities for flushing the skin and body members, shall be provided where employees are exposed to corrosive air contaminants. . 12 -1 8 . Requirements for exhaust systems. 12-13.1. Components ana air flow. An exhaust system shall include either: a. Hoods, booths or enclosures of proper design at points of genera tion or release o f air contaminants, connected by means of pipe, duct or other conduit to air movers and, where necessary, air-cleaning devices; or b. Other means of proper design, for directing the flow of air contami nants from the points of -generation or release to air movers and, .where necessary, air-cleaning devices. c. The air flow into, each hood, booth or enclosure and the capacity of the air mover shall be sufficient ro maintain controlling velocities. 12-18.2. Capacit. The capacity of an exhaust system shall be calculated on the basis that all hoods, booths and enclosures connected to the system are open except when otherwise specifically permitted by the commissioner upon his finding that a split system provides the required control. 12-18.3. Discharge from exhaust systems. The point of discharge of any exhaust system shall, be located so as to prevent or minimize the entry or re-entry of contaminated air into any work place. 12-18.4. Recirculation. Discharge air which contains dangerous air con taminants shall ..hot be recirculated. 12-18.5. Maintenance of air flow. The required air velocity and rate of air flow through, hood, booth, enclosure or other poiut of ventilation shall be maintained at. all times when the machine or process to which ventilation is applied is in operation or use. 12-13.6, Make-up air. Air inlets or air supply systems shall be provided for the admission of make-up air to replace that removed by an exhaust system, as. follows :. . The air supply shall enter the workroom in such manner that no employee in a normal, working position is subject to a draft of air having a tempera ture of. more than 10F below the general temperature of the room or a greater velocity than 200. feet per minute. Subject to this requirement, windows, doors and other building openings 130-6 718 T W E L E T 11 ( J KEI CI AI , SI TM'EEM EXT may be used in place of special air inlets. Make-up air shall not be taken from any location where it is contaminated by discharge from exhaust ducts, stacks or other plant effluents. 12-18.7. Design of hoods, booths or enclosures. Every hood, booth or en closure shall be designed, constructed and located, where practicable, so that the air contaminants will fall, be projected or drawn in the direction of air flow. 12-18.8. Construction of hoods, booths or enclosures, a. Heavy abrasive concentrations. Hoods, booths or enclosures made of metal shall be at least two gauges heavier than the gauge required'for piping connected thereto. If made of other materials, they shall be of equivalent strength and rigidity. b. Gases, fumes, vapors and light dusts. Hoods, booths or enclosures shall be at least the same gauge as the piping connected thereto. 12-18.9. Piping-design of systems handling dust. 12-18.9.1. Pipe joints. 1. All joints and seams shall be soldered, welded or otherwise scaled to make them! tight. Exception: Pipes on exterior of buildings on discharge side of air movers. 2. Longitudinal lap joints or seams in metal pipe, except when of welded construction, shall be double locked or lapped one-inch and riveted with rivet centers of not more than three inches. Sheet metal screws may be used when nonfibrous material is handled. 3. Lap joints shall be made so that the outlet and of one length fits into the inlet end of the next length in the direction of air flow. The mini mum length o f lap shall be 1^4 inches and rivets shall be provided at not more than 4Vl-inch centers. There shall be not less than four rivets in any such lap joint. Sheet metal screws may be used when nonfibrous material is handled. 4- Spot welds may be used in place, of rivets in equal numbers. 5. Joints of material other than metal shall be of equivalent strength and rigidity. 12-18.9.2 Telescopic joints. Telescopic joints shall be constructed so that the pipe connected to the hood extends into the outer pipe at least one pipe diameter, bnt not less than six inches, when fully extended. The end of the outer pipe shall have' a reinforcing band or bead. The fixed member shall be firmly supported. 12-18.9.3 Branch pipe junctions to mains. 1. Every branch pipe shall be connected to the main pipe at the side .or top and at an angle not ex ceeding 45 degrees and shall incline in the direction o f air flow at junction to the main. Branch pipes shall not project into the main, and shall junction with the main in the tapered section as close as practicable to the larger end of the section. "Shoe" or special fittings are acceptable where space limitations prevent compliance with the above. 2. Not more than one branch pipe shall enter the main at the same plane of intersection, except at the terminal, or where the branch pipes enter at an angle of 30 degrees or less. 12-18.9.4. Transformation pieces. Transformation pieces shall be tapered so that the length of the taper shall be not less than five times the differ ence between the diameters of the smaller and the larger pipes.: Transfor mation pieces shall increase in area by the amount necessary to maintain the required air velocity, and shall be of the same gnuge of metal as the larger size of pipe. 12-18.9.5. Elbows and bends. 1. Round elbows shall have a center line radius equal to two times the pipe diameter wherever available space permits. 2. In place of the above, rectangular elbows, venturi-shaped elbows or other bends of equivalent low-resistance design may be used. I 130-7 D EPAICTMb'NT UP LABOR 719 3. All 90-degree bends or elbows six inches or less in diameter shall be made of not less than live pieces nr equivalent prefabricated construction. All 90-defrref; bends or elliows more than six inches in. diameter shall he made of not loss than seven-piece construction. Obtuse angles, bends or elbows .shall be pieced proportionately. 4. Elbows and bends shall be of metal not less than two gauges heavier than the piping, connected thereto. 12-18.9.6. Cleanout openings. 1. Cleanout openings, spaced not more than 20 feet apart on pipes which are larger than 12 inches in diameter or 12 feet apart on smaller diameter pipes, shall be provided in all horizontal rums and shall aways be provided at bends and pipe junctions. 2. Cleanout openings shall be of a size that will permit ready access to the interior of the pipe and shall offer no obstruction to air flow. Remov able caps shall be installed'at all terminal, ends. When piping is constructed with flanged joists for purposes of cleaning, inspection openings shall be provided in such piping in place of regular cleanouts. 3. Pipe reinforcing shall be done on the outside of the pipe. 12-18.9.7. Dampers arnl gates. The use of dampers, gates, or orifices is prohibited in an exhaust system except for the purpose of balancing the air flow In the system. If so used, they shall be riveted or permanently fastened to prevent any further manipulation. 12-13.9.8. Pipe supports. 1. Horizontal runs of pipe, including branch pipes extending' more than three feet shall be securely supported and fastened to some substantial portion of the hulldlng structure or to per manent supports. Such supports shall not be over 12 feet on centers for 8-inch or smaller pipes and 20 feet on centers for pipes larger than 8-inch diameter arid in any case shall be sufficient to carry the weight of the sys tem if plugged with material. Exception: Thick-wall welded pipe may be spaced on such centers as will he structurally safe. 2. Vertical runs of branch pipes shall be supported securely. ' -13.9.9'. Pipe location. Piping shall be located so as not to cause a fire haxaid, shall he accessible for inspection and maintenance and shall be protected against external damage. 12-18.9.10. Materials of construction. 1. Pipes or darts shall be con structed of not less than the following gauges of steel or iron, plain hot rolled or galvanized : Pipe Diameter U. S. Standard Gauge of Metal Highly fi.br.i~ sive m atter a n d lo n j hour usage {over 30 use factor). Highly abra sive m atter and short hour usage (u n d e r 30% use factor). Mild abrasive m atter and long hour usage. m atter and short hour Up to 4" 22 24 24 Over 4" to S" ipcl. 20 22 24 Over 8" to 18" inrl. 13 20 22 Over IS" to 30" inel. 16 IS 20 Over 30" 14 16 IS 720 2. Where a flexible section of piping is necessary, flexible noncollapsiblu piping shall be used and its length shall be kept to a minimum. 2. Ollier materials used for the construction of piping, duels, hoods, booths anti enclosures shall he of a type approved by Ihu hoard. 12-33.9.11. .lir /low requirements. 1. The system shall he so designed as lu provide the required air lloiv in every hraneh pipe. Means shall be designed to provide a substantially uniform uir velocity through each hraneh. 2. The branch and main pipe size shall lie based on an uir velocity suffi cient to irunsport the. substances col looted, by the hoods, bool 1rs or enclo sures, except where an oversize main or plenum system ... used with accept able means of refuse removal therefrom. 3.. Branch pipe connections to hoods, booths and enclosures shall be shaped to minimize the orifice and resistance losses due to the flow of uir into the system. 12-13.10. Piping-design of systems handling fumes, gases and vapors. 12-13.10.1. Design and operation. The piping system shall be designed, constructed, maintained and operated to insure the flow of th volume of exhaust uir required to protect' employees from exposure to dangerous air contaminants. 12-18.30.2. Materials of construction. 1. Pipes or duels shall he con structed of not less than the following U. S. Standard gauges of steel or iron, plain hot rolled or galvanized : Duct Diameter Gauge Up to 5" ...................... 2G Over 5" to 29" . ..,........ 24 over 29" to 39" . . . . ........ 22 over 39" to 49" . . . . ........ 20 over 4 9 " ........ ........ Rectungutar Duct Gunge .Maximum Dimension 4" to 30" ................. . . 24 over 30" to 6 0 " ........... .. 22 over 60" to 90" ........... . . 2 0 over 90" ....................... . . 1 3 2. Pipes fo r corrosive fumes, gases or vapors shall be constructrd of, or coated with, materials of corrosion resisting properties. 3. Other materials used for the construction of piping, ducts, hoods, booths and enclosures shall he of equivalent strength and rigidity. 12-19. A ir movers. 12-19.1. General. Every exhaust system shall he connected to an air mover which shall maintain the required rate of air flow in all parts of the exhaust system. Such air mover shall he of a type and size suifalde for handling the air contaminant to be exhausted. Where practicable, the air mover shall be located beyond the air-cleaning equipment sn ns In handle clean air. The commissioner may require the submission, to him of the manufacturer's per formance data for the. air mover. 12-19.2. Capacity. The operating characteristics of fhe air mover shall be such as to create the required rate of air flow when operating against the total resistance pressure of the exhaust system. When requested by the com missioner, the design calculation of the exhaust system shall lie submitted to him. 12-19.3. Connection to system. In all exhaust systems, except when the air mover draws from a plenum chamber, such air mover shall be ennneered to the inlet pipe by a split sleeve or d"aw band not less Minn IS inches long securely fitted to prevent air leakage. This provision, however, doe? not apply when the air mover has an nspe.et.ion door or wlu-u the air mover is located nt the end of the system or otherwise may he readily disconnected from the system for inspection. 32-19.4. Fire and explosion. Air movers handling air conI;lininc flam mable or explosive dusts, gases, or vapors shall have nonforrous moving pari?: 130-9 IHl'AKTMKNT O f LABOR 721 1 2 -2 0 . A ir cleaning devices. 12-20.1. Ueguirrnirnta, E v en - exhaust system handling d u st or fibres shnll l>e p ro v id ed with an o ir-d ca n in g device to rem ove a ir contam inants before tlisd m rg e in outer air. E xhaust system s handling fum es, gases, mists nr v a p o rs shall be sn arranged that discharged a ir co n ta m in a n ts will not re-enter (be workroom. 12-2U.2. /."i.iru/ of debris. Collected m aterials shall he rem oved and disposed of at such intervals as may be necessary to m aintain the equipment at the re q u ire d o p e ratin g efficiency. S a fe and read y m eans shall be provided for such removal and disposal. 1 2 - 2 1 . A ir flow and branch pipe requirem ents. 12-21.1. .Sratio miry grinding, polishing, etc. S ta tio n a ry g rin d in g , polish in g . buffing a n d scratch-brushing operatio n s suhject to a rticle 12-10. shall be provided wit h local exhaust'ventilation operating at not less than the rates specified in the following table: M inimum rale of S'ZE o r W h e e l ok D isc ] Diameter in inches Width, inches 1. GiU.VUt.XS AND AUKASiva CUTTJXU-OFF WHEELS U p to 9 ............................. notover 1 Va O v e r 9 io IB ................... notover 2 O v e r 1(3 !o1 9 ............... not over 3 Over. 19 to2 4 ............... not over 4 O v e r 2 4 to3 0 ............... not over 5 O v er 30 to 3(3............... not over 6 a ir flow through. hood in c.f.m. 220 390 500 010 SS0 1200 2 . B U FFIN G , PO LISH IN G , AND SCRATCH BRUSHING W H EELS (N O T E 1 ) U p to 9 ............................ notover 2 300 O v e r 9 to 1 6 ................... notover 3 500 O v er 16 to1 9 ................not over 4 610 O v e r 19 to2 4 ............... not over 5 740 O v e r 2 4 to3 0 ............... not over 6 1040 3. HORIZONTAL SINGLE SPINDLE DISC GRINDERS U p to 1 2 ........................... O v e r 12 (o 1 9 ................... -- O ver 19 to 3 0 ................... -- O ver 30 to 3 6 ................... -- 220 390 610 SS0 4 . H O R IZO N TA L DOGULE SPIN D LE DISC GRINDERS U p to 19 in c ................ -- 1 pipe O ver 19 (n25 ine...... -- 1 pipe O v e r 25 to30 i n c . . . . -- 1 pipe O ver 30 to53 i n c . .. . -- 2 pipes O ver 53 (n72 i n c . .. . -- 4 pipes 5. VERTICAL SINGLE SPINDLE DISC GRINDERS (N ot Covered) U p to 20 in e ........... .. 2 pipes - 610 8S0 1200 1770 6250 610 (N o te 2) (Xofe 2) O ver 20 to 30 i n e . .. . 2pipes 1490 O v e r 30 lo 53 i n c . . . . 4pipes <(vur 53 io 72 i n e . . . . 5 pipes .Votes ajijdi/itin in tiie above ttinlrs: 3530 ' 6010 S o t o 1. " l '.ilishiiiij whorls" m ean- " mailt--u p " h ard wheels faced with abrasive. -Vote 2. Olio brandi pipe may he uscd wlicrever lira or muro brandi pipes are requiretl proviucd Ilio cross-seetii'nnl nroa of (he single brandi pipe is equal M (ho iiiinhineil eritss-seelional area of tlie roqiiircd nuinher of braneh pipes ami ilio air flow inro th eneireh'ng bood is substantially itniiorm at all ponila. 130-10 ! c,f;rc?V-'i`>"*" 'i x}r 722 TWELFTH O FFICIA L SUPPLEMENT Minimum rate of S ize of Wheel ok Disc Diameter in inches (Contd.) W idth, inches ( Contd.) air flow through hood in c.f.m. (Contd.) 6. VERTICAL. SINGLE SPINDLE DISC GRINDERS (More than half covered) Up to 20 inc.......... 1 pipe 500 (Note 3) Over 20 to 30 in c .. 2 pipes (Note 2) 790 Over 30 to 53 inc. I 2 pipes (Note 2) 1770 Over 53 to 72 in c .. 2 pipes (Note 2) 3140 7. GRINDING AND P O L I3 IIII i BELTS ANU STRAPS Up to 3 3 to 5 5 to 7 7 to 9 9 to 11 11 fo 13 220 300 390 500 610 740 Notes applying to the above tables: Note 2. One branch pipe may be used wherever two or more branch pipes are required provided the cross-sectional area of the single branch, pipe is equal to the combined cross-sectional area of the required nmiiber of branch pipes and the air flow into the encircling hood is substantially uniform at all points. Note 3. "H alf covered" means a minimum covering of not less than 50 percent of the open area, over the top of the grinding wheel. "Note 4. Local exhaust ventilation of high speed machinery shall provide such higher rates of air flow as may be necessary to; control the contaminants. The Commissioner shall advise on the minimum rates of air flow required in such case. 12-21.2. Other stationary grinding, polishing, buffing and scratch-brush ing operations. 1. For wheels of greater width than given in the above tables the minimum rate of ventilation shall be not less than that specified for wheels of equal grinding surface area. 2. F or wheels of greater surface area' than that given in the above tables, the minimum air volume shall be increased at the rate of 30 cfm to each 20 square inches of wheel surface area. 3. Grinding or polishing belts and straps wider than,13 inches shall he ventilated at a rate of not less than 50 cfm per inch of width. 4. F o r any wheel or belt strap not specifically listed, the rate of ventila tion shall be in proportion to the above requirements:1 5. An air volume of 200 cfm may be tmed for jewelry or dental buffing where wheels six inches or less in diameter are used and for surface grind ers, cutter grinders, and similar tool room machines. 6. Swing frame grinders shall be provided where practicable with a booth which shall be ventilated at a rate of not less than 150 cfm per square foot of open area. 12-21.3. Hood and enclosure design. 1. Local exhaust hoods which, are used as protection hoods in grinding operations shall be constructed in ac cordance with article 19-22 of Industrial Code, Rule No. 19. \ ' 2. Portable or flexible shaft tools used for grinding, huffing, polishing and sanding operations, where subject to article 12-10, shall be conducted with hoods of one of the following types where practicable : 1. A downdraft grille of adequate size with respect to the work proc essed with exhaust ventilation of not less than 150 cfm of gross open area. Kntc 4 does not specifically apply to any of the requirements of the tahfc appearing on vnre*; 721 and 722 but apparently has been included for ffcneral mfdrinanan. i I i I 130-11 Ul-'.l-'AKT.MKNT OK U.SluiK 2. A bosit b or enclosure ventilated aL a rate not less than 100 cfm per square foot oT gross open area. 3. A suction hood of sufficient site and capacity to maintain a velocity in the direction of the hood of not less than 100 fpm at the point of oper ation when it is most remote from the hood. Wherever practicable, the hood shall be located in the. direction of dust throw. Exception: Occasional portable and flexible shaft grinding, polisliing, buf fing and sanding operations which are not.regular shop production operations. 12-21.4. Woodworking and miscellaneous. I. Woodworking and miscel laneous operations creating dangerous air contaminants shall be provided with local cihausL ventilation at rates not less than hereafter specified. 2. The air volumes and number of branches required for woodworking and miscellaneous Machinery subject to this rule shall be not less than those shown hereafter. Air volume Branch pipe diameter cfm inches 200 3 350 4 440 -ID, 550 660 5V, 800 0 1100 1 1400 8 . 1800 9 2200 10 3100 11 A. Self-feed table rip saws: 350 cfm for bottom hood and 350 cfm for saw hood. diate: For closed chain saw use 550 cfm for saw hood. B. A ll other rip. table mitre, swing and variety saws. Up to 12-inch diameter : 350 cfm Over 12-inch to 16-ineh diameter: 440 cfm Over 16-ineh diameter: 550 cfm Dado heads--any diameter: 550 cfm C . Gang circular saws. Ventilation rate shall be such as to provide the required Control. D. Band saws and resaws. Up to 2-inch blade: 350 cfm each fr~ cutting hood and lower wheel enclosure. Where wheel diameter is iu inches or less--350 cfm in single hood. Over 2-inch to 3-inch-wide blade: 550 cfm for cutting hood and 350'efm for lower wheel enclosure. Over 3-inch to 4-inch-wide blade: S00 cfm for cutting hood and 550 cfm for lower wheel enclosure. Over 4-inch to 5-mch-wide blade: 1100 cfm for cutting hood and 550 cfm for lower wheel enclosure. Over 5-inch-wide blade: 1400 cfm fur cutting hood and 550 cfm for lower wheel enclosure. Disc sanders. Up to 12-inch-.diamelor disc: one branch with 350 cfm. Over 12-inch to 18-inch-diameter disc: one branch with 440 cfm. Over 13-inch to 26-inch-diameter disc: one branch with 550 cfm. 130-12 7.24 TWKLFT11 OFFICiIAL S l'i'FLKMfcLNT Over 26-inch to 32-inch-diamcter disc: two branches each with 350 cfm. Over 32-inch to 38-inch-diamcter disc: one branch with 350 cfm and one branch with 550 cfm. Over 38-inch-diamcter disc: one branch with 550 cfm and two branches with 350 cfm each. F. Multiple drum sanders (Drums over the table). Dp to 3I-inch-wide drum: one branch per drum with 550 cfm. Over 31-inch to 49-inch-wide drum: one branch per drum with 800 cfm. Over 49-inch to 67-inch-wide (Jriiin: one branch per drum with 1100 cfm. Over 67-inch-wide drum: one branch per drum with 1400 cfm. Use 350 cfm for brush. Fewer branches may be used as long as total branch pipe air volume is not reduced. G. Multiple drum sunders (Drums under the table). Dp to 31-inch-wide drum : one branch per drum with 350 cfm. Over 31-inch to 49-inch-wide dram : one branch per drum with 550 efin. Over 49-inch to 67-inch-wide drum: one branch per drum with 800 cfm. Over 67-inch-wide drum: one branch per drum with 1100 cfm. Use 350 cfm on brush. Fewer) branches may be used as long as total branch pipe air volume is not reduced. H. Single drum and spindle sunders. Up to 50 square inches of sanding surface: 200 cfm. Over 50 to 200 square inches of sanding surface: 350 cfm. Over 200 to 400 square inches of sanding surface: 440 cfm. Over 400 to 700 square inches.of sanding surface: 550 cfm. Over 700 to 1400 square inches of sanding surface: 800 cfm. Over 1400 to 2400 square inches of sanding surface: 1100 cfm. On drums of more than 2400 square inches of sanding surface a branch of a size determined as follows: d = 0.133 \Za, where d = branch diameter in nearest standard size and a = square inches of sanding surface. On long -drums of small diameter, air volumes mentioned above should be divided into two or.more branches at least equalling in volume that of the single volume specified. I. Horizontal belt or edge sunders. Up to 6-inch-wide b elt: 440 cfm for drive pulley and 350. cfm for idler pulley. Over 6-inch to 9-inch-wide belt: 550 cfm for drive pulley and 350 cfm for idler pulley. Over 9-inch to 14-inch-wide b elt: 800 cfm for drive pulley and 440 cfm for idler pulley. Over 14-inch-wide belt: 1100 cfm for drive pulley and 550 cfm for idler pulley. Where more than one belt is used, the air volumes specified shall be required -for each belt. Where a common hobd is used for more than one belt, a volume of not less' than the sum of the volumes :: specified shall he used. Where the belt direction is reversible, the volume for the idler pulley shall be the same as'specified for the drive pulley. J. Vertical belt sanders (rear belt and both pulleys enclosed). Up to 6-inch-wide belt: 550 cfm. Over 6-inch to 10-inch-wide belt: 800 efra, belt: 1100 cfm. 130-13 D El ' AKTMEXT OK LABOR 725 K. Jointers. Op to 6-inch-widc kn iv es: 350 efm. Over G-inch to 12-inch-wide knives: 550 efm. Over 112-inch to 20-inch-wide knives: 800 efm. Over 20-inch-wide knives : 1100 cfm. L. Single planers. Up to 20-inch maximum working width: 800 efm. Over 20-ineh to 26-inch maximum working width: 1100 cfm. Over 26-ineh to 32-inch maximum working width: 1400 cfm. Over 32-inch to 33-inch maximum working width : 1800 cfm. Over 38-inch maximum working width: 2200 cfm. M. Double planers. Up to 20-ineh maximum working width: 800 cfm for upper head and 550 cfm for lower head. . Over 20-inch to -26-inch maximum working width: 1100 cfm for upper head and 800 cfm for lower head. Over 26-inch to 32-iiich maximum working w i d t h 1400 cfm for each head: Over 32-inch to 38-inch maximum working width: 1300 cfm for upper head and 1400 cfm for lower head. Over 33-inch maximum working width: 2200.cfm for upper head and 1400 cfm for lower head. hT. Moulders, Matchers and sizers. Up to 4-inch maximum size: 350 cfm for each side head, 550 cfm for each side head. 550 cfm for top head and 300 cfm for bottom head. Over 4-inch to 6-inch maximum size: 660 cfm for each side head, 800 cfm for top head and bottom head each. Over 6-inch to 8-inch maximum size: 800 cfm for each side head, 1100 cfm fo r top head, 800 cfm for bottom head. ' Over 8-ineh maximum size: SOO cfm for each side head, 1400 cfm for top head and bottom head each. Where profiler is used, provide additional volume not less than that specified for top head. O. Sash stickers. One 4-inch branch on each head. P. Wood shapers. Up to 1 horsepower per spindle: 350 cfm per spindle. Over 1 to 3 horsepower per spindle: 550 cfm per spindle. Over 3 to 5 horsepower per spindle: SOO cfm per spindle. Over 5 to 7% horsepower per spindle: 1100 cfm per spindle. Over 7Vi horsepower per spindle: 1400 per spindle. Where one continuous hood includes two or more spindles, the air volume required for the hood may be based on a volume per spindle of 250 efm less than specified above, but in no case less than 350 cfm per spindle. Q. Tenoners. Top and. bottom tenon heads: 550 cfm for each head. Cope and dado heads: 550 cfm for each head. Cut-off saws up to 12-ineh-diameter saw : 350 cfm. Over 12-inch-diameter saw: 550 cfm. R. -4utomatic lathes. 350 cfm per foot of cutting length where hood is stationary. Branch pipes shall be located to provide effective air removal over full face of hood. S. Pulley pockets: 550 cfm. 726 | TWELFTH OFFICIAL SUPPLEMENT I T. Pulley aties; 550 cfm. U. Hogs. Up to 1 ton of refuse per hour: 1600 cfm. Over 1 ton of refuse per hour; air volume to he based on 50 cfm per pound of refuse convoyed. Note 1: Use branch and main velocity of not less than 4500 fpm. Note 2: A separate exhaust system should be provided but addi tional separator is not required if separator used for other wood, working equipment is adequate. ; V. Floor sweeps. The area of branches te floor sweeps with covers which are kept closed when not in use need not be included in computing total air volume. W. The air volume exhausted for any machine not specifically listed in this rule shall be not less than 350 cfm and the hood shall be so arranged that an ipward flow of air into the ventilating system is maintained during the operation of the machine at not less than 4500 fpm. X. Portable sanders shall conform to the requirements for portable grinders (section 12-21.3, paragraph 2). 12-22, Open surface tank operations. 12-22.1. Open surface tank operations. Open surface tank operations creating dangerous air contaminants' shall be provided w ith .ventilation to remove such contaminants. 12-22.2. Classes o f operations. F or the purpose of this rule open surface tank operations are classified into 10 classes-as follows: . . Glass I. Electroplating and anodizing operations involving: Chromium, arsenic, tin from alkaline baths, deplating; cyanide solutions of copper, brass, bronze, zinc, cadmium. Class II. Electroplating operations involving; Cyanide solutions of silver, gold; acid or neutral solutions of copper, zinc, nickel, lead. Class III. Metal pickling or stripping operations 'using sulphuric or hydochloric acid. Class IV . Metal pickling operations using nitric or hydrofluoric acid. Class V. Alkaline cleaning and other water solutions and water oper ated at a temperature o f over 180 F. Class VI. Alkali cleaning solutions operated at a temperature of 180 F. and under. Class V II. Solvent cleaning processes using flammable solvents having an open cup flash point above 100 F. 1 . Class V III. Solvent cleaning processes using flammable solvents having an open cup flash point of 100 F and under. Class IX . Solvent cleaning processes using nonflammable solvents except when, used only occasionally and kept covered when not in use. Class X . Solvent cleaning processes using mixture of flammable and nonflammable solvents. 12-22.3. A ir flow requirements. 1. Dilution ventilation shall be provided at the following rates for the class operation involved : 1. Either mechanical or natural ventilation amounting to 10 efra per square foot of open tank surface area in all rooms in which class II, VI or V II operations are conducted. - 2. Either mechanical or natural ventilation amounting! to 50 cfm per square foot of open tank surface area in all rooms where class I II opera tions are conducted. 2. Local exhaust ventilation shall be provided for class I, TV, V, V III, IX and X operations and may be used in lieu of dilution ventilation for all other classes of operations. 130-15 11Kl`.\ IITMKNT UK LAHUH 12-22.1 I exhaust ventilation. Local exhaust ventilation shall be by ,leans n! >i.. the follow ing: 1. Enclosing liooil; 2. Overhead canopy; Lateral 12-22.5 E'n. '...itio hood exhaust. An enclosing hood shall project over lie entire tana and he fixed iii position in such -location that the head nf the mployee in all hie normal working positions is in front of the hood opening. The hood shall lie rigidly constructed and provided with exhaust ventilation capable of creating an air velocity of not less than IDO fpm through the nood opening. 12-22.6. "rrrlu a d canopy exhaust. An overhead hood shall project over the entire tank, shall be located as close to the tank as possible consistent with the oprnitJfin performed and may he open on thrro or more sides. The hood shall .he provided with exhaust ventilation capable of creating an air velocity of not less tfian 100 fpm through alt openings between the bottom edges of the hood and the top edges of the tank nearest thereto. 12-22.7. Lateral exhaust. 1. A lateral exhaust hood shall cause essen tially .horizontal air movement over the tank towards the hood, shall project over the tank as fa r as practicable and shall be provided with an air flow not less than that specified in the following table: CFM S q . FT. OF T A S K SURFACE AREA FOR TAKfC W IT H O.VE LOXfi S in n AO Al.XST W A U . OR RAnTlTlON OR W IT H EQ fIV A l.F.S'T BAFFI.F.1 Tank width in feet Ratio: ------------------------- Tank length in. feet Glass 0 -- 0.24 0.25 -- 0.49 0.50 -- 1.0 I ... 100 125 150 II . 50 60 75 I I I ' . . . . . . 75 IY ___ 75 95 110 95 110 Y ............. 50 60 75 . V I 75 95 110 V II 50 60 75 YIII . . . . . 75 95 110 * For free-standing tanks, i.e. without baffle, increase the rate 25 percent except for class VII, Y III, IX or X tanks equipped with effective condenser. 2. Exhaust slots. W here exhaust manifolds with slots flush with the inside of the tank lining and extending the full length of the tank side are used: . 1. Every tank 24 inches ,or less in width shall he provided with an exhaust slot at; least one inch, and not more than three inches in width on at least one of. the longer sides. 2.. Every tank, over 24 inches in width shall be provided with at least two such slots, one along each of the two longer sides. 3. The manifold shall be so constructed or baffled as to provide an average distribution of. air flow. 12-22.8. Freeboard. The level of the vapors in any class IX tank shall he kept,below, the top. ed^e of the tank by a distance equal to at least onehalf the tank width or 36 inches, whichever is less. 1-2-22.9. Heating, ' l : External heating source. Xo external source of heating shall hr used for class V II, Y III or X operations. 2. Gas. Where-gas is used as fuel for heating class IX tanks, the com bustion chamber shall ho tight construe!ion. except for necessary combustion and flhe openings. Mei-bnmcally ventilated flues shall be independent of the 728 TW ELFTH O F F IC lX l SUPPLEMENT exhaust duct. Natural draft flues shall be provided with draft diverters, All flues shall be constructed of corrosion-resistant material. 1 3. Electric. Electric heating units for tanks of class IX operations shall be constructed of materials resistant to the tank contents and shall be con structed and installed so as to prevent hot pots. 4. Thermostatic control. Every tank of a class IX operation containing a heated liquid shall be provided with two thermostats, one of which shall be connected to control or shut off the source of heat when the contents reach a temperature not higher than 20F in excess of the boiling point of the solvent in its uncontaminated state and the other of which shall be located above the vapor zone and be adjusted to shut off the sdurce of heat when the tempera ture in the zone of the thermostat is 125F or above. 12-22.10. Control means other than ventilation. 1. I f tank covers or sur face depressive agents are used as the control method, they shall be so used as to give effective control throughout the entire operating cycle of the tank. 2. When heat is added to the workroom to prevent the condensation of water vapor evaporated from open tanks into mist, such additional heat shall be so controlled that it does not raise the wet bulb temperature in the lower six feet of the workroom above 80F. .' 12-22.11. Drying and draining. 1. Booths and tunnels in which products removed from class V II or V III tanks' are dried shall be constructed of in combustible materia] and provided with exhaust ventilation capable of pro ducing an air flow of not less than 100 f.p.m. into all openings. The rate of ventilation shall be such as to maintain the solvent concentration below 25 percent of the lower explosive limit. 2. All products after immersion in either class IX or X solvents shall be held in the vapor 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. When excess solvent on products removed from class V II, V III, IX and X tanks continues to drip from the product after removal of. the prod uct to a location away from the tank, such location shall be provided with means to drain the dripped solvent continuously either to. the tank or a suit able solvent container and, where required- by the provisions. .if 'Article 12-8, shall be provided with a ventilating hood, booth or enclosure. 12-22.12. Condensers. Class IX tanks shall be equipped with condensing or cooling surfaces consisting of pipes, coils,-water jackets or any combina tion thereof- located on at least two sides in the 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. 12-22.13. Cleanout doors. Tanks or machines used for solvent cleaning and_ having ,a surface vapor area of more than two square feet shall be equipped with suitable cleanout or sludge doors located near the bottom of each tank or still. Such doors shall be so designed and gasketed that there is no leakage of solvent when closed. 12-22.14. Solvent transfer. 1. Transfer of class V III solvents from drums to tanks shall be by means of a hose or pipe leading to the bottom of the tank being filled. Such drums and tanks shall be effectively grounded electrically. 2. Class V III, IX or X solvents shall not be stored or transferred in uncovered vessels. 12-22.15. Inspection and maintenance. 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 m ar collect shall he ventilated and cleared. I 130-17 D K r A R T M K N T OF 1.AI10R 729 2. Floors ami platforms around tanks shall be maintained in accordance with Industrial Code Rule So. 16. I2-22.1G. Welding. S o work requiring welding or upen flame shall be done near any solvent cleaning equipment unless such equipment has first been thoroughly cleared of solvents and their vapors. 12-22.17. Personal protection. All employees working in and around open surface tank operations shall be instructed as to the hazards of the work and the precautions to be taken. 1"2-22.lt'. sfirriul pfcriiittinus for rijuiudr. 1. When rinse, acid and cya nide 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 venti lation. 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. 3. Cyanide salts shall be stored in closed containers in a locked enclosure and the floor of the enclosure shall be raised above any floor on which acid carboys are stored. 1 2 -2 3 . Tumbling processes. 12-23.1. General provisions. Tumbling processes creating dangerous air contaminants shall be provided with means to remove pr control such con taminants at the point of generation. 12-23.2. A ir flow requirements. Tumbling mills, drums, cages or harrels not within the above exception shall be placed in an enclosure which shall be ventilated. at a rate of not less than 75 c.f.in. per square foot of horizontal area of the enclosure. A ir velocity through openings into the enclosure shall be not less than 400 f.p.tu. 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 he provided to control such contaminants. 12-24. Abrasive blasting operations. 12-24.1. General provisions. A brasive b lastin g o p eratio n s creatin g d an gerous a ir contam inants shall be enclosed as completely as practicable and shall be provided with a local exhaust system to remove the a ir contam inants. Exception: O utdoor abrasive cleaning operations where the o p erato r is fu r nished with and wears an approved air-line respirator. 12-24.2. Classification. Abrasive blasting rooms in which an operator is employed shall be classified as follows: 1 . ' Class I. Rooms in which natural sand is used as an abrasive or is otherwise introduced into the operation. 2. Class 11. Rooms in which materials other than natural sand are used as the abrasive and the material being blasted is free of natural sand. 12-24.3. A ir flaw requirements. Abrasive blasting equipment shall be pro vided with local exhaust ventilation in accordance with the following require ments for the various types of equipment: 1. Class 7 rooms having a length to width ratio of 2 to 1 or less shall . be provided with down draft ventilation of not less than 80 f.p.ra. over the entire projected floor area of the room and shall be exhausted downward through exhaust openings along at least two sides of the room. The lowest point of such openings shall be not more than 10 inches above the floor line. Class I rooms having a ratio of length to width in excess of 2 to 1 shall be ventilated either as above or by means of longitudinal ventilation of not less than 100 f.p.m. 2. Clttss 11 rooms shall lie ventilated in the same manner ns Class 1 moms except that vealilalinu shall he provided at 40 f.p.m. and 50 f.p.m. respectively. 730 TWELFTH OFFICIA L SUPPLEMENT 3. Abrasive blasting rooms and tunnels shall be provided with an air velocity of at least 300 f.p.m. through all openings into the enclosure. 12-24.4. Rotary abrasive blasting tables. Rotary abrasive blasting tables shall be enclosed and local exhaust ventilation shall be provided to maintain air velocities of not less than 500 f.p.m. through all openings when curtains are in place. j 12-24.5- Abrasive blasting barrels. Abrasive blasting barrels shall be pro vided with local exhaust ventilation to maintain air velocities of not less than 500 f.p.m. through all openings. 12-24.6. Abrasive blasting hand cabinets. Abrasive blasting hand cabinets shall be provided with local exhanst ventilation to maintain air velocities of not less than 500 f.p.m. through all openings. 12-24.7. Abrasive blasting equipment. 1. Abrasive cleaning equipment shall be constructed to resist abrasion and all joints and connections shall be dust- tight. .... 2. Openings for admission and removal of air shall be of sufficient area and so located that, the air flow, in the room, cabinet or device Will be ade quately distributed and will remove the air contaminants crpated. 3. Openings for admission of air shall be provided with baffles to prevent effectively the escape of abrasives into the general room air. 4. Doors and inspection ports shall be sealed to prevent the escape of air contaminants while the equipment is in operation. 5. P its and hoppers connected to abrasive cleaning equipment shall be sealed to the equipment and shall be dust-proof except at such openings as are necessary. 6. Mechanical conveyors shall be enclosed and connected to the exhaust system. 12-24.8. Operation. Approved air respiratory protective equipment of the supplied air shall be used by workers employed in abrasive blasting rooms or tunnels. 12-24.8.1. A ir supply. A ir furnished to air line respiratory equipment shall be clean. 12-2S. Crushing, milling, screening, mixing and conveying. 12-25.1. General provisions. Crushing, milling, screening, mixing and con veying processes creating dangerous air contaminants shall be enclosed and provided with local exhaust ventilation to remove or control the air contam inants a t the point of generation where practicable. 12-25.2. A ir flow requirements. 12-25.2.1. Crushers and mills. The air flow through hoods or enclosures used to control air contaminants created by crushing and milling processes shall be such as to provide minimum air velocities through openings as follows: Light weight dusts: 75 f.p.m. All other: 200 f.p.m. 12-25.2.2. Screens. The air flow through openings of enclosures of screens used to control air contaminants created by screening operations shall be such as to provide minimum air velocities as follows: Light concentration san d : 50 f.p.m. Light weight dusts: 200 f.p.m. Exception: Screens within tight enclosures. 12-25.2.3. Mixers. The air flow through mixer hoods or enclosures used to control air contaminants shall be a minimum of 150 f.p.m. through necesssary working or feed openings. 12-25.2.4. Elevators. The air flow through openings of bucket elevators shall be a minimum of 150 f.p.m. 130-19 Exception.- Enclosures ol' tight construction may lie maintained ue.r negative pressure. I'd 25.2.5. Conveyor belts. Exhaust hoods at loading and discharge points nf conveyor belts shall he provided with following minimum rates of air flow: licit Speed A ir Flare . I'p to 200 f.p.m. 150f.p.m . Over 200 f.p.m. 200f.p.m . IVhen- contaminants arc released from belts at points other than loading and discharge points belt wipers, enclosure or other control methods shall be provided to prevent dissemination of air contaminants. 12-25.2.6. Screw or s/iiral conveyors. Such conveyors shall be covered with tight covers and exhaust hoods providing a minimum air flow' of 150 f.p.m. sliall bo provided at feed or discharge openings. 12-25.2.7. Storage bins. Storage bins shall be constructed and venti lated to prevent the escape of air contaminants during any stage of the operation 12-25.2.S. Bagging machines. Where practicable bagging machines shall be enclosed as completely as possible and ventilated at a minimum rate of 100 c.f.m. per square foot of open area in the enclosure for paper hag filling and 200 e.f.m. per square foot of open area for cloth bag fillingExhausted collecting hoppers shall be provided and so located in relation to the bagging machine as to catch any spilled material. Where the above methods are not as practicable other control ventilation methods capable of preventing air contaminants may be substituted. 12-25.2.9. Filling of barrels and containers. Barrels and containers other than bags shall he filled in such a manner that air contaminants dis charged from the barrel - container are prevented by exhaust ventilation or enclosure or a comlu:...:ion thereof from being disseminated into, the workroom. 12-25.3. Branch pipe requirements. Branch pipes required for the venti- lation of ./crushing, milling, screening, mixing, conveying and bagging proc esses shall be sized to maintain transport velocity or a velocity of 2500 f.p.m., whichever is greater. 1 2 -2 6 . Welding, brazing, flame cutting and metallicmg. 12-20.1. General requirements. Welding, brazing, flame cutting and met allizing operations creating dangerous air contaminants shall be provided with local exhaust ventilation to control such contaminants. 32-26.2. Classes o f operations. Class I. Operations in confined spaces involving toxic metals including but hot limited to antimony, beryllium, cadmium, lead, mercury, selenium or tellurium, or involving fluorine or any alloy, compound or flux con taining any one or combination thereof. Class 11. Operations in confined spaces involving metals, alloys or com- pounds other than those listed in class I. Class 111. Operations in unconfined spaces invoicing metals, alloys or compounds listed in class I. Class I V . Operations in uneonfined spaces involving metals, alloys or compounds listed in class II. 32-26.3. Prateelitin of operators. 12-26.3.1. Class I requirements. Every employee performing any class I operation shall he furnished and shall nse an approved air-line respi rator Or supplied air helmet, and the confined space shall be ventilated at a minimum rate of 6U0 e.f.m. per operator inside the enclosure. 12-26.3.2. Class II requirements. In every class I I operation the con fined space shall be ventilated at a minimum rate of 100 c.f.tn. per square 732 TW ELFTH OFFICIAL' SUl'PLEMENT loot of floor area inside the enclosure, or every employee required to work vrithin the confined space shall ho furnished and shall use an approved air line respirator or supplied air helmet. 12-26.3.3. Class I II requirements. Protection of employees performing class I I I operations is required at all times when portable equipment is used in flame cutting or welding lead,"or other metal plated or otherwise coated with cadmium, zinc, lead or lead containing compounds. Other class III operations shall bq provided with protection of a type required by article 12-9. Where conformance to such provisions is not practicable the employer shall furnish and the employee shall wear an approved respirator, any other provision of this rule notwithstanding. . 12-26.3.4. 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 ventilatidn.. Exceptions: The following class. IV operations are excepted from the above requirements: 1. Spot welding; 2. operations which are not usual shop practice; 3. out-of-door operations. 12-26.4. Local exhaust ventilation for welding, etc. Local exhaust venti lation shall be by one of the following'incans; 1. Fixed or movable hoods located as near as practicable to the opera tion with a rate of air flow sufficient to maintain a velocity in the direction of the hood of 100 f.p.m. at the welding arc when the hood is at its most remote distance from the arc. The air volume and duct size required to maintain, the velocity when a properly flanged hood (i.e., a flange width equal to one-half the connecting duct diameter but not less than three inches) is at various distances from the arc shall be as follows: Distance Volume* required ( C.F.if.) Duct diameter 4" to 6" 150 2Vi" to 31/2 " 6" to 8" 275 31/2" to 4 i/2" 8" to 10" 425 41/2" to 51/2" 10" to 12" 600 5y2" to 6" Add 20 percent to required air volume for Unflanged hood. 2. An enclosure closed on top and open on not more than two sides iu which the welding is done and which shall be provided with an air flow sufficient to maintain a minimum inward velocity of 50 f.p.m. through all . open areas of the enclosure. 12-27. Exhaust gases from motor vehicles operating in confined ares. 12-27.1. General provisions. Confined areas in which' motor vehicles are operated and releasing dangerous air contaminants shall be provided with means to remove or control the fumes, gases or vapors released or disseminated. 12-27.2. Ventilation of servicing locations. Each servicing location shall -be provided with a duct which is part of an exhaust system discharging out- of-doors. The inlet end shall either slip over the tail pipe of the engine of the equipment being serviced or shall be provided with a hood large enough to slip over the tail pipe or any deflector attached thereto. Ventilation shall be provided at a rate acceptable to the commissioner hut in no .case shall the air flow be less than 100 c.f.m, and the flexible pipe diameter less'than three inches. Exception: F or servicing locations handling not more than two vehicles n duct system conforming to the fallowing may be substituted for a mechanical exhaust system: ` 1. The inlet end of the duct shall fit tightly over the -tail pipe of the engine being serviced, and 130-21 2. Tin1iliii't K-uirr li shall not exceed LUfeet, and 3. Tli.' iiui-1 iliaim-ter shall In' of Ilie same diameter us the t:iil pipe Lo ivhirli ii i.- I'nim.'rii'.!. ;iml 4. Tin-ilurl i.uiliM .-hull terminate nul-of-ilnnrs, anil 3. Tlir ihi.-i .-ball In- i-niij-i rui-U'il am! maintained gaslight. jll-27..'!. i t 11 ,n ,t u i>i- tail /jit" lyltitnsi system.'. system s having up lo t..ni- liratH-.liis provided w ith m itenia! ic closing devices shall have a fiLjuii'i!y fi|ii;il to the total n u m b e r o f branches. Systems- having more than to u r brnm-hc-. previdcil with autom atic closing devices shall have a capacity lapi.-il til Jo u r I.ranches plus 5(J p e rc e n t o f the cap a city o f the num ber of brum-lic- in e.\ee.-s uf lim r. ._ 12-27.1. Cuparity uf uncapiicil Mil pipe exhaust system's. AVhere tail pipe 1.ranches are open alien not in use, tile capacity of the system shall he based on the total number of brandies connected to the system. 12-28. Severability. I f any provision of this rule or the application thercuf to any person or circumstances is held invalid, such invalidity shall not affect other provisions or applieations of this rule `which can be given effect without the invalid provision o: application and to .this and'- the provisions of this rule are dc.inrrd to lie severable. 12-29. . Mximum- allowable concentrations--evidence of dangerous air contaminants. The existence of air contaminants consisting of or deriving from- flu- substance; nuiueil in the following table in relative quantities greater bail those set. forth a.-.' tu each substance shall constitute priina-faeie evidence lint suri! rontaininunls arc d.-nig.'i-ons air contaminants. Printc-facic evidence as .u whether other air cotttainimints nr other conceutralions than (hose set forth :u the following (aide constitute dangerous air contaminants by reason of their xiVtenee in-oauntiiies tending to injure the lu-altb of employees shall include in opinion by a physician to that eft'cet as a matte;- of sound clinical judgment. Substance A. Gases and Vapors I 'arls per million Acetaldehyde ............................................................................................... Acetic acid ................................................................................................... Acetic anhydride .............................................. Acetone ......................................................................................................... Acrolain ................................................................................... Acrylonitrile .............. Ally! alcohol........................................... Allyl propyl disulfide ............................................................................... Ammonia ......... Amyl acetate .................'..................................................................... . Amyl alcohol (isoanyl alcohol)................................................................. Aniline ..................................................................................... Arsine ........................................................................................................... Benzene (benzol) ......................................................................................... Benzyl chloride ........................................................................................... Bromine ....................................................................................................... Butadiene ..................................................................................................... Butanone (mefhvl ethyl ketone) ............................................................ Butvlacetate .'............................................................................................... Vutvl alcohol , ............................................................................................ Butyl amine ................................................................................................. 200 10 5 1000 0.5 20 5 2 100 200 100 5 0.05 35 1 1 1000 250 200 100 5 Sq in original. A pparently jhould be " end". I 130-23 iiK.lWKTMKNT UF LAltOR 735 A. Cases and Vapors-- (Concd.J Siihshnii r Purls per million hyleiic mine .......................................................................................... liylene oxide ............................................................................................ uurine .................. . ......................... ...................................................... uoromchlnramethane ............................................................................ >nnaldchydc . . .................................................................... irfural ........................................................... .......................................... irfuryl alcohol ............................................ isoline .......................................................................................... :ptune .................................................................................... `Xaiie .................... xxanonc .................................................................................................... Mone ........................................................................................................ rdrazuie .................. ydroffen bromide ........................................................ ydrogen chloride .................. 1............................................................... ydrogen cyanide .................................................... ydrogen fluoride ......................................................................... ydrogen iieroxide,.................................... ydrogen selenide ............................ ydrogen sulllde .......... dine ........................................................................................ uphorone ................................................................................................... opropylamlne ........................................................ esltyl oxide ...................................... ethyl .Rotate ............................................................ ethyl acetylepc .............................................. ethyl alcohol ............ ethyl bromide ...................... ........................................... ....................... ethyl eellasolv'e ethyl ccllosolye acetate .......................................................................... ethyl chloride .................................................................................... ethyl isohutyl earbiuol (methyl anvl alcohol) .................................. ethyl mercaptan ........................................................................... cthvlal (dimothoxyincthnne) ................................................................ ethyl chloroform .......... . ...................................................................... ethylcTcIohexane . . . 1................................................... ethyleyelohexanol .............. cthylcyelohcxannne ........................................................ ethyl formate .................................................................................... ethylene chloride .......................................... aptka* (coal ta r) ............................................................. aptlia" (petroleum) ............................................................... iefcel carbonyl .................................. -Xitroanilinc ............................................................................................. itrobenzene ...................... itroethans''* ................................................................................ jtrogen dioxide ........................................................................................ itroglyeerin .............................................................................................. ilromeihane .............................................................................. 5 3Dll 0.1 UIUII 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 25 100 25 50 1000 500 500 100 100 100 500 200 500 0.001 1 1 100 5 0.5 100 So in o ric in n l. A p p a re n tly should be "n ap h th a.", oo m anginal. .Apparently shouM bi? "nitroithntx.*". 73 TW ELFTH OFFICIAL SUPPLEMENT A. Gases and Vapors-- ( Coned.) Subslaw Paris per million 2-Ni tro propane Nitrololueiu' .. O ctane .............. Ozone .............. P e n tan e ...................................... P e n tan o n c ................................................................................................................. Perchloraethyl mercaptan ................................, ..................................... Perchlorethylone ................................. Phenol ............................................................................................. Phe'nylhydrazene ........................................... Phosgene (carbonyl chloride) ........................................... . . . . . ' ............ Phosphine ............... P h o sp h o ru s trich lo rid e ......................... ................. V........................ ................. Propyl acetate ............................................. Propyl alcohol (isopropyl alcohol) ........................................................ Propyl ether (isopropyl ether) Propylene dichloride ................ Propylene mine ......................... Pyridine .......................... ........... Quinone ............................... Stihine Stoddard solvent ................................ Styrene monomer (phenyl ethylene) Sulfur hexafluoride........ ................... Sulfur monochloride .......................... Sulfur dioxide Sulfur pentafluoride ........................ ........................... ............................. p-Tertiary butyl toluene .......................... '....................................... 1, 1, 2, 2-Tetraehloroethane ............................................................. Tetra hydrofuran .................................................. .-........................... Tetranitromethane ...................................... ...................................... Toluene ............................................................................................. o-Tnluidine .............................................. ..................... ...................... Trichloroethylene ................................................ ....................... .......... Trifiuoromonobromo methane ......................................................... . Turpentine .................................................... ............... ....................... "Vinyl chloride (cbloroethanc) ............................ .................... . Xylene .................................................................. ....................... . 50 5 500 0.1 1000 200 0.1 200 5 5 1 0.05 0.5 200 4500Q0 75 25 10 0.1 0.1 500 200 1000 1 10 0.025 10 5 75 1 200 5 200 1000 100 500 200 B. T o xic Dusts, F um es and M ists iSuhiiance Milligrams per . Cubic Meter Aldrin .................................. Animate ......................................................................... - -- .................... Antimony ................................................ .......... ....................................... Arsenic .................. Barium (soluble compounds) .............................. Cadmium ' .............. Calcium arsenate ...................... Chlordane .................................................... 0.25 15 0.5 0.5 0.5 0.1 0.3 2.0 130-25 I>KI'ALi'rMKNT OF LAHOK 737 II. T o x ic D u s t s , F u m e s a n d M ists-- ( C o n l d . ) Miiligrnni> i"r v r llhic Mrlrr llii.rinalcii tj.j'hi'ftyl oxide ....................................................................... hlurodipher.y! . ....................................................................................... bromic a.-id ami ffii'Dinates os Cr 03 ---- ......................................... mg herhin-ii- ......................................................................................... vanide a.-' l" N ..................................................................................... + 1) l 2.. 3 -III*rniilii'iifixyacctic arid ) .............................................. DT (2, 2- lus- i i-chlovoplienyl )-1, 1, 1-trirhluret lumi* .................. pldriri ...........................................................................................- - - nitrotoluene ............................... ....................................... . .................... nitro--o~ere.nl ............................................... ......................................... :PS (rtlivi-prniirnphcnvl thiono benzene phosphonate) .................. erro vanadium dust .....................................- ......................................... luoririe ................... ..............................................................................- . lydroqmnonc . . ......................................................................... '............... ron oxide fu m e .......................... .... ................ ................................................... end ......... ..................... \ ......................'........................................ '............. end arsenate . ............................................................................... ............. indine I f .................... (agn.csiuni oxide fume ............ lalathon ....................................................... [anjranes ................................. fetboxychlor ........ .................................................. :.................................. Icrcuiy,- . . .................................................................................................. [oiybdemmi (soluble compounds) .......................................................... tolybdenum (insoluble compounds) .................................................... rffn-rjo mercurials (asmercury) .............................................................. arathiqn 'entaehioronapb.tliaiene ............................................................................. entachlornphenol ....................................................................................... `hnsphorbs (yellow) . ............................................................................... hospborus pprifachlofitle ......................................................................... hosphonis pcntasnlfide . : ...................................................................... icric acid . . . . . . . . . . . . ........................................................................... eleniutfi compounds (as Sc) .................................................................. oriinni .hydroxide ...................................................................................... ulfuric . arid ................ FDP, :( tetraethyl dithiono pyrophosphate) ...................................... Mlurium i ............................................................................ KPP (tetraethyl pyrophosphate) ................................- ................... ';)'>l (2. 1. (5-lrinil i-nphenyl-methylnil minine) .................................. itaiilum dioxide ..................................................................................... .'. riehloronapbthnlrne .............. n:>iiri>i(.liutie . . ................. :.'.-ilium | 'tduiile ctutipivunds ) ................................................................ r.'iiiiutn f insnlnble eiiiupnniid.s) . ................ ............................. ............. :ilt:u1iUlti l Y, 111 dust ) ............................................................................. atiadium ( V, 0.. t'n..... .......................................................................... in- nxide il>inr (as Zn) .......................................................................... r< him ................................................................................................ 0.5 3 0-1 15 5 1** 2 0.25 1.5 0.2 0.:) 2.5 2 15' 0.15 0.2 0.5 15 15 6 15 0.1 5 15 0.01 0.1 0.5 0.5 0.1 1 1 0.1 0.1 2 1 0.2 0.1 0.05 1.5 15 5 1.5 (UI5 0.25 0.5 (1.1 15 ;3 130-26 738 TWELFTH OFFICIAL SUPPLEMENT ___________________________________ 4 _____________ ___________ :________ I' C. M inral D usts Substance Million Particles per Cubic Foot' Alundum ..................................................................... Asbestos ..................................................................................................... Carborundum (siliconcarbide) ............................................ Dust (nuisance, no free silica) .................................................. Mica (below 5% free S| 0j) . . . . ; .......... ............................................. Portland cement .......................................................................................... Talc ......................................................................... Silica: Class I (below 5% free SL0,) .............................................. Class I I (5 % to. 50% free S, 07) .................. ....................... Class I I I (above 50% free S( 0,) ............................................ Slate (below 5% free S( 0,) ................................................................. Soapstone (below 5 % free S, 07) .......................................... Total dust (below 5% free S( 0,) .......................................................... 5 20 50 50 20 5. 50 20 50 'N ote: Using- the light field low-power method of counting as described in TJ. S. Public Health. Report 47 No. 12, March IS, 1932 pp. 669-672 or its equivalent, and a standard-type impinger or other equivalent instrument for taking atmospheric dust samples. 50 50 50 20 In du strial Code B ulletin N o. 1 8 -- L ighting uL Factories and Mercantile Establishm ents Industrial Code Rules Nos. 50, 51, 52 and 53, in effect Jjpiuary 1, 1945 (pages 5<55 to 568, inclusive, volume 3, official compilationL^repealed October 18, 1956-.effective October 18, 1956 : filed- December 5,^1956. Statutorj- au thority $$ 2 1^^28 and 29, Labor Law. Industrial Code RuIh\No. 20-- A nfom atic Sprinkler Systems (Adopted A pril 13, 1956; eff^tiye^August 1, 1956; -filed May 22, 1956. Former Industrial Code Rule Nm>20, titled "Automatic Sprinkler Systems", as retitlcd and redesignated Mpy 12)sJ954 (page 533. tenth supplement, re pealed April 13, 1956; effective August^, 195G; filed May 22, 1956. Statutory authority 27-a, 28, 29,^290 and 230, Lntra^ Law) 20- 1. Application This rule applicp/fhroughaut the state of New'-York, except in the city of New York, to automatic sprinkler systems which arc specified or required by the provisions a f J'nc Labor Law and the Industrial CodeXand which are, or are proposed tirioe, installed in pursuance of an intent to wtqply with such pro visions. It does not apply in any way to any other sprinklerdiystems. W heie a partial sprinkler system covering a hazardous seetiohsor other area is installed for limited protection to provide opportunity for safeXxit from a bdllding, such installation shall be governed by the standards hereiirirequired /in so fa r as-the commissioner may require. \ 130-27 <) B t x t i o f S in u o r k l DEPARTMENT OF STATE) " EXHmrr C C F-2 3t Is Htrtbg CnlifiEi). the attached is a true cooy of Title 12 *>art 12 filed with the Sew York State Deoartr.ent of State on Auoust 1, 195B and effective November 1, 19 58 .----- -- ------------------------------- ' / / February *** AcManJ wW ^ndW M' eiohty-nine TO THE OFFICIAL COMPILATION OF CODES. RULES AND REGULATIONS OF THE STATE OF NEW YORK Jan u ary 1, 1957 to December 3 1 . 1958. Inclusive CAROLINE K. SIMON ScfNUf of Sl* VOLUME l 1961 D EPA RTM EN T OF LABOR 389 liquids re being applied or stored t least'one hnd fire extinguisher approved (or tr.e control q( Aimmible liquid fires. Extinguishers containing carbon tetrachloride, methyl bromide or other toxic material are prohibited (or this usage. In addition th ere shall be at least one approved extinguisher for each 2.500 square feet of floor area so located that a person shall not have to travel more than 50 feet to reach the nearest extinguisher. Ex* tir.guish'ers shall be easily accessible and protected from injury. 12-27. Evidence of dangerous air contaminants- The existence of air contaminants consisting of or deriving from the substances named in the following tasle in relative q uantities greater than those set forth as to each substance shall constitute prim a facie evidence that such contami nants are dangerous air contam inants. Prim a facie evidence as to whether other air contaminants or lesser concentrations than those set forth in the following table constitute dangerous air contaminants by reison of th eir existence in quantities tending to injure the h ealth o f employees shall include an opinion by a physician to th at effect as a matter of sound clinical judgm ent. Gate aruJ V a p o rt A. S u it toner Parts pt.r M illfon Acetaldehyde ' 200 Acetic ac.d 10 Acetic anhydride 5 Acetone 1000 Acrolein 0.5 Acrylonitrile 20 Ally! alcohol 5 Ailyl propyl disulfide 2 Ammonia 100 Amyl aeetate 200 Amyl alcohol (isoamyl alcohol) 100 Aniiine 5 Arsine 0.05 Benzene (benzol! Benzyl chloride B rotnine Butadiene Butanone methyl ethyl ketone) Butyl acetate Butyl alcohol Butyl amine Butyl cellosolve Butyl mercaptan 25 1 1 1000 250 200 100 5 200 10 Carbon dioxide Carbon disulfide Carbon monoxide Carbon tetrachloride Cellosolve Cellosolve acetate Chlorine Chlorine trifluoride 5000 20 100 25 200 100 1 0.1 A. Substance Parts per Mill'on Chlorobenzene ttnonochlorobeniene) Chloroform 1-Chloro -1- nitropropane CWoroprene Cresol (all isomers) Cyclohexane Cyciohexanol Cyclohexanone Cyclohexane Cyclopropane 75 :oo 20 25 5 <00 100 100 4nn 400 Diacetone alcohol 50 Diborase 0.1 o-Dichlorobenzene 50 Dichlorodifiuoromethane 1000 1. 1-DiehIoroethane . 100 1 .2-Dichloroethylene 200 Dichloroethyl ether 15 Dichl.oromonofluoromethane 1000 1 .1-Dichloro -1- nitroethine 10 Dichlorotetrafluoroethane 1000 Diethylamine 25 Difluorodibromomethan* 100 Diisobutyl ketone 50 Dimethylaniline 5 Dimethylsulfate 1 Dioxane (diethylene dioxide) 100 Ethyl acetate Ethyl alcohol (ethanol > Ethylamine Ethyl benzene Ethyl bromide 400 1000 . 25 200 200 THIRTEENTH OFFICIAL SUPPLEMENT A. C../#'tuff Ethyl chloride Ethyl ether Ethyl formate Ethyl mercaptan Ethyl ailicate Ethylene chiorohydrln Ethylene diamine Erhvlene dibromide Ethylene dichloride Ethylene imine Ethylene oxide Port* p t r M illio n 1DOO 400 100 250 100 5 10 25 100 5 100 Fluorine Fluorotrichloromethane Formaldehyde Furfural Furfuryl alcohol 0 .1 1000 5 5 200 Gasoline 600 Heptane Hexane Hexanone Hexone Hydrazine Hydrogen bromide Hvdrogen chloride Hydrogen cyanide Hydrogen fluoride Hydrogen peroxide Hydrogen selenide Hydrogen.sulfide 500 500 100 100 1 5 5 10 3 1 0.05 20 Iodine Isophorone Isopropylamin 1 25 5 Mesityl oxide Methyl acetate Methyl acetylene Methyl alcohol Methyl bromide Methvl celiosoive Methyl celiosoive acetate Methyl chloride Methyl isobutyl carbinol (methyl amyl alcohol) Methyl mercaptan Methvlal i dimeihoxymethane) Methvl chloroform Methvlcyclnhexane Methvlcylohexanol Methvlcyclohexanone Methyl formate Methylene chloride 50 200 1000 200 20 25 25 100 25 50 1000 500 500 100 100 100 500 S * I K i r u t A o r * U r >k*J4 U "Mp A. PurI Naptha* fcoi Itar > Naptha* t petroleum Nickel carbonyl p-Nitroaniline Nitrobenzene Nitroethane Nitroren-dioxide Nitroglycerin Nitromethane 2-Nitropropane Nitrotoluene C Octane Olone Pentane Pntanone Perehloromethyl mercaptan Perchlorethylene Phenol Phenylhydrazine Phosgene Icarbonyl chloride) Phosphine Phosphorus trichlor.ri: Propyl acetate Propyl alcohol l isopropyl alcohol Propyl ether . (isopropyl ether Propylene dichloriile Propylene imine Pyridine Quinone Stibine Stoddard solvent Styrene monomer (phenyl ethylene) Sulfur dioxide Sulfur hexafluoride Sulfur monochloride Sulfur pentifluoride ( p-Tertiary butyl toluene 1. 1. 2, 2 Tetrichloroethane Tetrahydrofuran Tetranitromeihane Toluene o-Tnluidine Trichloroethylene Trifluoir.monobrumumeih.ine "turpentine Vinyl chloride (chloroeihene) Xylene 130-31 D EP A R T M E N T OF LABOR 01 T o xic D usts, Fum es nuil Mis It B. Subs'aiiee Aldn'n Ammate Antimony Arsenic M illigrams , P 'r Cubic Sitter 0.2 5 15 0.5 0.5 Barium soluble compounds 0.5 Cadmium 0.1 Calcium arsenate 0.5 Chlordane 2 Chiormated diphenyl oxide 0.5 Chlorodiphenyl 1 Chromic acid and chromates as CrO: 0.1 Crag herbicide 15 Cyanide as CX *5 2. 4-D -2. 4-dichlorophenoxy- acetic acid 10 DDT 2. 2- bis- <p-chloropheny! 1, 1 .1-trichiorethane 1 Dieidrin C-.2 Dimtrotoluene 1.3 Diniuro-o-cresol 0.2 EPN ethyl-p-nitrophenyl thiono benzene phosphonate; 0.5 Ferro vanadium dust Fluoride 1 2.5 Hydroquinone 2 Iron oxide fume 15 Milliijramt per B. Cubic .Meter Mu.'athon Mii:iif;.ne*e M eiviry Metli/xychlor Molybdenum soluble i-orr.p: ends .< Molybdenum in-ilubie compounds/ 13 6 0.1 15 5 15 Orpane mercurii.s a- mercul". 0.01 Parathion Pentach'oronanhthalene Pemaihioropher.: Phrynhorua yeZ.w Phi'?pnurus penta.hLride Phosphorus peutisulfide P.cric acid Selenium ;ompour.d.* /a* Se< S-jdii-m hydroxide isl; ric acid 0.1 0.5 0.5 0.1 1 1 0.1 0.1 2 1 TEDP tetrnethv dithiono pyrophosphate Tellurium T E PP i.tetraethyl pyrophosphate Tetryl <2. 4. 6-trinitruphenylmethylnitramir.e. Titanium dioxide TrichJoronaphthtiene Trinitrotoluene 022 0.1 0.05 1.3 15 5 1.5 Lead Lead, arsenate Lindane Magnesium oxide fum e 0.20 Vanadium (V.O. d-sti 0.2 Vanadium iV=0. f-tne/ 0.5 Zinc oxide fume '.as Z n' 15 Zirconium 0.3 0.1 13 5 B92 THIRTEENTH OFFICIAL SUPPLEMENT M ineral Duett C. Substance M illion Particles per Cubic F oot* Asbestos Dust (nuisance, no free silicaj Mica (below 5'"i ireeSiO ii Portland eement Silica: Class I (OelowST free SiOt) Class IT 'S^c to 5 0 Tree SiO,< Class III above SO'T free SiO;) Slate i below o '! free SiO.i Soapstone (below o^e free SiO.l Talc Total dust (below 5To free SiO.) 5 50 20 50 50 20 5 50 20 20 50 * S'te: U s ih f th e lig h t field low -pow er m ethod of co u n tin g as described m U . S. Public H ealth R ep o rt 47 No. 12, M arch IS, 1332, pp. 669-672 or its equivalent, and a stan d ard type im pinger or o th er equivalent instrum ent fo r taking atm os pheric dust sam ples. 1 2 -2 3 . A pproved devices o r m aterial* . A n y device o r m aterial th e b o a rd h as approved p u rsu a n t to sectio n 27a o f th e L abor Law foi co m p ly in g w ith th is ru ie m ay be so used as if by th is rule specifically : ized an y o th e r general or special provision o f th is rule n o tw ith st- 12-29. S e v e ra b ility . If a n y p ro v isio n of th is ru le o r th e appl th e re o f to a n y person o r circu m stan ce is held in v alid , su ch invalid! n o t affect o ilier provisions ur applications of th is rule w hich can b effect w ith o u t the invalid provisions or a p p lic a tio n s an d to th is < p ro v isio n s of th is rule ar* declared to be sev erab le. Industrial Code Rule No. 14-- Construction, Initalli Inipection and Maintenance of Steam Boilers 14.3. Qualification and commisaioning of inspector*. 14-5.1. I As amended November 18. 1958; effective November 18 filed November 25. 1958. Statutory authority 3i2T-a. 28. 29 and 204 L aw ;. Upon recommendation of the examining board, a ccrtificatepetency and commission as an inspector of steam boilers shall be is the industrial commissioner to persons at least 25 years of a te wht the employ of insurance companies, who successfully pass a written nation as to their knowledge of the construction, installation an tenance of s'eara boilers and their appurtenances. Candidates taki examinations must hav had five years of practical satisfactory ex' in boilermaking, boiler installation and inspection, or boiler shop y or operation and maintenance of steam boilers. Technical educatiin proportion to its value, be given credit as equivalent to experi to exceed two years. Such examinations shall be conducted by an ex board appointed by the industrial commissioner, which shall be c of one representative of each of the following interests: boile facturers. insurance companies, operating engineers. Bureau of B spection of the Department of Labor and such others as the it commissioner may designate.