Document 3JvmdnnpoDq90R4wRXBjVR8nn

OCCUPATIONAL HEALTH ?*** t' *-*o 31:6343 by other employee* trained in tecort- term*, and rehearsed in their applica creased risk, including reduced immu nee with subparagraph (6) of this pen- tion. nological competence, those undergoing graph, may hove contents Identification (ill) AH materials relating to the pro treatment with steroids or cytotoxic limited to a generic or proprietary name, gram shall be provided upon request to agents, pregnancy and cigarette smoking. or other proprietary identification, of the authorized representative* of the Assist (3) Records, (i) Employers of em carcinogen and percent. ant Secretary and the Director. ployee* examined pursuant to this para (11) Containers of N-Nltrosodlmetbyl- (f) Reports--U> Operations. Not later graph shall cause to bo maintained com amtne and containers muired under than March l, 1474, the information re plete and accurate records of all such paragraphs (e)(1) (r), <c)(6)(vil)(b>, quired In subdivlrions (1). (It), (ill), and medical examinations. Records shall be and (c) () (vlli) <b) of this section which (lv) of this paragraph shall ha reported wmiweA for the duration of the em are accessible to, or handled by employ in writing to the nearest OSHA Area ployees' employment Upon termination ees other than authorised employees or Director. Any changes in such Informa of an employee's employment, including employees trained In accordance with tion shall be similarly reported in writing reUnment or death, or in the event that subparagraph (5) of this paragraph shall within 15 calendar days of such change. toe mployer eeaaes business without a have contents Identification which In (i> A brief description and in-plant lo iaceeeaar, records, or notarized true cludes the full chemical name and Chem cation of the area(a) regulated and the eoptez thereof, shall be forwarded by ical Abstracts Service Registry number ddrem of each regulated area; iwehftssed adl to Director. as listed in paragraph (a) (1) of this sec (II) The nama(s) and other Identify (ID Ramil required by this para tion. ing information as to'the presence of graph shall fea provided upon request to (ill) Containers shall have the warn N-Nltrasodtmethylamlne In each regu authorized representatives of the As- lag words ` CANCER-SUSPECT AGENT"' lated are*; ristant Secretary or the Director, and, displayed Immediately under or adjacent (III) The number of employees In each upon raqumt of an employee or former to the contents identification. (tv) Containers which have regulated area, during normal operations N-N1- Including maintenance activities and employee, to a physician designated by tha employee or to a new employer. trosodlmethy1amine contents with cor rosive or irritating properties shall have label statement* warning of such haz ards, noting, if appropriate, particularly sensitive or affected portions of the body. (lv) The manner in which N-Nitro- eodtmethylamlne Is present in each regtnated area; ay. whether It la manu factured, processed, used, repackaged, released, stored, or otherwise handled. (Ill) Any physician who conducts a medical examination required by this paragraph shall furnish to the employer a statement of the employee's suitability for emplojrment in the specific exposure. <3> Lettering. Lettering on signs and instructions required by subparagraph (1) of this paragraph shall be a mini mum letter height of 3 inches. Labels on containers required under this section shall not be less than V6 the size of the largest lettering on the package, and not less than S point type In any instance: Provided, That no such required lettering need be more than 1 inch in height. U) Prohibited statements. No state ment shall appear on or near any re quired sign, label, or Instruction which contradicts or detracts from the effect of any required warning, information or Instruction. (4) Training and indoctrination. (1) Each employee prior to being authorized to enter a regulated area, shall receive a training and Indoctrination program In cluding, but not necessarily limited to: <a> The nature of the carcinogenic hazards of N-Nltrosodimethylamine, in cluding local and systemic toxicity: <b> The specific nature of the oper ation involving N-Nitrosodimethylaroine which could result in exposure, <c) The purpose for and application of the medical surveillance program, in cluding. as appropriate, methods of self- examination; <d) The purpose for an application of decontamination practices and purposes: (e) The purpose for and significance of emergency practices and procedures; (/) The employee's specific role in emergency procedures; (g) Specific information to aid the employee in recognition and evaluation of conditions and situations which may result in the release of N-Nitrosodi- methylamine; <fi) The purpose for and application of specific first aid procedures and prac tices. (3) Incident*. Incidents which result in the release of N-Nltrosodimethylamine into any area where employees may be potentially exposed shall be reported In accordance with this subparagraph, (i) A report of the occurrence of the incident and the fact* obtainable at that time including a report on any medical treatment of affected employees shall be made within 34 hours to tha nearest OSHA Area Director. (U) A written report shall be filed with the nearest OSHA Area Director within 15 calendar days thereafter and shall in clude: (a) A specification of the amount of material released, the amount of time involved/ and an explanation of the pro cedure used in determining this figure: (b) A description of the area involved, and the extent of known and possible employee exposure and area contamina tion, and <c> A report of any medical treatment of affected employees, and any medical surveillance program implemented: and (d) An analysis of the circumstances of the incident, and measures taken or to be taken, with specific completion dates, to avoid further similar releases. (g) Medical ntrveiUonce. At no cost to the employee, a program of medical sur veillance shall be established and imple mented for employees considered for as signment to enter regulated areas, and for authorized employees. (1) Examina tion*. (l) Before an employee la assigned to enter a regulated area, a preassign ment physical examination by a phy sician shall be provided. The examination shall include the personal history of the employee, family and occupational back ground. including genetic and environ mental factors. (U) Authorized employees shall be [39 FR 3755, January 29,1974, Effective February 11,1974) 11910.93q l^Vinyl ddorldil, () Scope iW opyBcafton. (1) This section Includes requirements for the control of employee exposure to vinyl chloride (chloroethene). Chemical Ab stracts Service Registry No. 75015. (3) This section applies to the manu facture, reaction, packaging, repackag ing, storage, handling or use of vinyl chloride or polyvinyl chloride, but does not apply to the handling or use of fabri cated products made of polyvinyl chlo ride. (3) This section applies to the trans portation of vinyl chloride or polyvinyl chloride except to the extent that the Department of Transportation may regulate the hazards covered by this sec tion. <b) Definition*. (1) "Action level" means a concentration of vinyl chloride of 0.5 ppm averaged over an 8-hour work day. (3) "Assistant Secretary" means the Assistant Secretary of tabor for Occupa tional Safety and Health. U.S. Depart ment of tabor, or his designee. (3) "Authorized person" means any person specifically authorized by the em ployer whose duties require him to enter a regulated area or any person entering such an area as a designated representa tive of employees for the purpose of. ex ercising an opportunity to observe moni toring and measuring procedures. (4> "Director" means the Director, National Institute for Occupational Safety and Health, UR. Department of Health, Education, and Welfare, or his designee. (5) "Emergency" means any occur (i) A review of this section at the em provided periodic physical examinations, rence such as. but not limited to, equip ployee's first training and Indoctrination not less often than annually, following ment failure, or operation of a relief de program and annually thereafter. the preassignment examination. vice which is likely to. r does, result in (U) Specific emergency procedures Oil) In all physical examinations, the massive release of vinyl chloride. hall be prescribed, and posted, and em examining physician shall consider () "Fabricated product" means a ployees, shall be familiarized with their whether there exist conditions of in product made wholly or partly from OLI 1132 Copyright C> 1974 by Tha Bureau of National Adairs, Inc. {Sac. 101O.93q(6)) 15 1:5344 REFERENCE FILE polyvinyl chloride, and which does not from 0.35 through OA ppm, plus or minus in accordance with paragraph (g) of this ^acquire farther processing at tempsra- 3ft percent from over Oi ppm through section. A program shall be established ^^os, ><i i'rr times, sufficient to cruse 1A ppm, and plus or minus 3S percent and implemented to reduce exposures to ^Ktss melting of the polyvinyl chloride over 1.0 ppm. (Methods meeting those at or bdow the permissible exposure resulting in the release of vinyl chloride. accuracy requirements are available In limit, or to the greatest extent feasible, (7) "Hazardous operation" means any the "NIOSH Manual of Analytical solely by means of engineering and work operation, procedure, or activity where a Methods"). practice controls, as soon as feasible. release of either vinyl chloride liquid or (ft) Employees or their designated rep- gas might be expected as a consequence reerotative* shall be afforded raasonahle of the operation or because of an acci .opportunity to observe the monitor dent in the operation, which would result ing and measuring required by this In an employee exposure in excess of the paragraph. permissible exposure limit. (a) Regulate* area. (1) A regulated (g) "OBHA Area Director" means the ana shall be established where: Director for the Occupational Safety and Health Administration Area Office having jurisdiction over the geographic area in which the employer's establish (!) Vinyl chloride or polyvinyl chloride Is manufactured, reacted, repackaged; stored, handled or used: and ment is located. (11) Vinyl chloride concentrations an (9) "Polyvinyl chloride" means poly in excess of the permissible exposure vinyl chloride homopolymer or copoly limit. (3) Written plans for such a program shall be developed rad furnished upon request for examination and copying to authorised representatives of the Assis tant Secretary and the Director. Buch plans khan be updated at least every six months. (g) Jteiffrwfory protection. Where respiratory protection is roquUad under this notion: (1) The eainliywr shall provide a nrobator which moot* the requirements of this iwiagiaifi and Shall assure that the employee wssa aoeh respirator, except mer before such is converted to a fabri (3) Access to regulated areas shall be that until DroUber 31,19?S, wearing of cated product United to authorised persons. A dally, respirators shall be at the discretion of (10) "Vinyl chloride" means vinyl roster shall be made of authorized per- each employee tor exposures not in ex- chloride monomer. aons who enter. earn of 35 ppm, measured over any 15- (c) Permissible exposure limit. (1) Ho employee may be exposed to vinyl chlo ride at concentrations greater than 1 ppm averaged over any 8-hour period, and (3) No employee may be exposed to vinyl chloride at concentrations greater than 5 ppm averaged over any period not exceeding 15 minutes. (3) Ho employee may be exposed to vinyl chloride by direct contact with liquid vinyl chloride. (d) Monitoring. (1) A program of filial monitoring and measurement Ball be undertaken in each establish ment to determine if there is any em ployee exposed, without regard to the use of respirators, in excess of the action level. (3) Where a determination conducted it) Methods of compliance. Employee exposures to vinyl chloride shall be eontrolled to at or below the permissible ex posure limit rrovided in paragraph (c) of this section by engineering, work prac tice. and personal protective controls as follows: (1) Feasible engineering and work practice controls shall immediately be used to reduce exposures to at or below the permissible exposure limit. (3) Wherever feasible engineering and work practice controls which can be in stituted immediately are not sufficient to reduce exposures to at or below the per missible exposure limit, they shall none theless be used to reduce exposures to the lowest practicable level, and shall be supplemented bv respiratory protection minute period. Until December 31, 1975, each employee who chooses not to wear an appropriate respirator shall be in formed at least quarterly of the hazards of vinyl chloridl and the purpose, proper use. and limitations of respireu>iy devices. (3) Respirators shall be selected from among those Jointly approved by the Mining Enforcement and Safety Admin istration, Department of the IcWVlor, and the National Institute for Occupa tional Safety and Health under the pro visions of 30 CFR Part 11. (3) A respiratory protection program meeting the requirements of i 1910.134 ball be established and maintained. (4) Selection of respirators for vinyl chloride shall be as follows: under paragraph (d)(1) of this section shows any employee exposures, without regard to the use of respirators, in ex cess of the action level, a program for de termining exposures for each such em ployee shall be established. Such a pro gram: Atmospheric concentration of dsfl ehlortde (i) Unknown, or above tAQO ppm (U) Wot orr SA00 ppm___________ Acquired apparatus Open-circuit. eelf-oootalned breathing apparatus, pres sure demand type, with full facepiece. (A) Combination typo O supplied air respirator, pres ent* demand typo, with full or half facepiece, (I) Shall be repeated at least monthly and auxiliary *eU-eontalned air supply: or where any employee Is exposed, without (B) Type C, supplied air rmptrator continuous flow regard to the use of respirators, in ex type, with full or half faeepleee. and auxiliary cess of the permissible exposure limit. aalf-eontaUied air supply. (II) Shall be repeated not less than fill) Hot orer 100 ppm___ _________ (A) Combination type C supplied air respirator de quarterly where any employee is exposed, mand type, with fun faoepleoe, and auxiliary without regard to the use of respirators, In excess of the action level. (ill) May be discontinued for any em ployee only when at least two consecu tive monitoring determinations, made not less than 5 working days apart, show ex (Is) Mot orer >9 ppm____-________ naif-contained air supply; or (B) Open-circuit seU-oontalned breathing apparatus With full faeepleee. In demand mode: or (C) Type O supplied air respirator, demand type, with full faeepleee. (A) A powered air-purifying respirator with hood. helmet, full or half faeepleee, and a canister posures for that employee at or below which provides a mrrice life of at least 4 the action level. hour* for ooneenrationt of vinyl chloride up (3) Whenever there has been a pro duction, process or control change which may result in an increase in the release of vinyl chloride, or the employer has any other reason to suspect that any em ployee may be exposed In excess of the action level, a determination of employee exposure under paragraph (d) (1) of this ^^ecttllcon shall be performed. (v) Mot orer 10 ppm______________ to X5 ppm. or <B> das mask, front- or beck-mounted canister which provide* a service life of at least 4 hour* for concentration* of vinyl chloride up to 95 ppm. (A) Combination typo C supplled-alr respirator, de mand type,, with ball facepiece, and auxiliary aelf-contalned air supply: or (B) Type C supplled-alr respiretor, demand type, with half facepiece; or (O) Any chemical cartridge respirator with an organic (4) The method of monitoring and Wneai'urement shall have an accuracy vapor cartridge which provides a service life of at least 1 hour for concentrations of vinyl (with a confidence level of 95 percent) of chloride up to 10 ppm. not less than plus or minus 50 percent Oecupotionol Safety & Heolth Reporter OLI 1133 OCCUPATIONAL HEALTH s-ao 31:S344A (S> (i) Entry Into oakom concentra (li> The purpose for, proper use. and promptly after any examination. A copy tions or eonoentnUons greater than limitations of respiratory protective of the physician's statement shall be pro- ye.000 ppm (lower explosive Unfit) may devices; vlded each employee. be *"*t only lor purposes of life rescue; and 01) Entry Into concentration* of %m (tv) The fire hasard and acute toxic ity of vinyl chloride, and the necessary (t) If any employee's health wouldbe mattHatty impaired by continued ex *fc*T* MAOO ppm, bat greater than MH protective stops: posure, snob employee shall be with ppm may be made only for purpoeee of (v) The purpose for and a description drawn from possible contact with vinyl life reecue. firefighting.' or securing equipment n w to prevent a greater hasard from release of vinyl chloride. (g) Where air-purlfytng respirators an need: Cl) Air-porlfylng oannlsten or car tridges shall be replaced prior to the expiration of tholr service Ufe or the and of the shift to which they are lint used, whichever occurs first, end (11) A continuous monitoring and alarm system shall be provided when concentration* of vinyl chloride eoold reasonably exceed the allowable concen trations for the devices In use. Such sys tem shall be used to alert employees when vinyl chloride concentrations exceed the allowable concentrations for the devices to use. (7) Apparatus prescribed for higher concentrations may be used for any lower concentration. (h> Hazardous operations. (1) Em ployees engaged In haxardous operations, Including entry of vessels to clean poly of the monitoring program; (vi) The purpose for, and a descrip tion of. the medical surveillance program; <vu> Emergency procedures; (viM) fipeefito Information to aid the npioyet in recognition of conditions which may result in ths release of vinyl chloride; and (lx) A review of this standard at the employee's first training and Indoctrina tion program, and annually thereafter. . IS) AH materials relating to the pro gram shall be provided upon request to the Assistant Secretary and the Director. (k) Metical surveillance. A program of medical euminance Shall be Insti tuted for each employee exposed, with out regard to the use of respirators, to vinyl chloride In excass of the action level The program shall provide each such employee with an opportunity for examination* and tests In accordance with this paragraph. All medical ex aminations and procedures shall be per chloride. -- () Laboratory analyses for all bio logical specimens included In medical mmhimhww shall be performed in labo- rotaries Uoeneed under 42 CFH Part 74. (7) It the --mtataf physician deter-' mines that alternative medical examina tions to those required by paragraph (k) (I) of hb section will provide at least equal aBnairnncg of detecting med ical edMMn pertinent to the exposure to vinyl AMUe. the employer may ac cept oath iktrnattve examinations as ii leering the requirements of paragraph (k) (l) of this section. If the employer obtains a statement from the examining physician setting forth the alternative examinations and the rationale for sub stitution. This statement shall be avail able upon request for examination and copying to authorised representatives of the Assistant Secretary and the Director. (1) Signs and labels. (1) Entrances to regulated areas shall be posted with leg ible signs bearing the legend: vinyl chloride residue from vessel walls, formed by or under the supervision of a Oswcsa-govacT Acute Axxa Atmtoam shah be provided and required to wear licensed physician, and shall be provided Fumumb, Oat and use; (i) Respiratory protection In accord ance with paragraphs (e) and (g) of this section; and (11) Protective garments to prevent skin contact with liquid vinyl chloride or with - polyvinyl chloride residue from vessel walk. The protective garments without cost to the employee. (l) At the time of Initial assignment, or upon, institution of medical surveil lance; (1> A general physical examination ahell be performed, with specific atten tion to detecting enlargement of liver, spleen or kidneys, or dysfunction In these (2) Areas containing hazardous oper ations or where an emergency currently exists shall be posted with legible signs bearing the legend: CtscB-tnsnoT Acute in Tins Asa* Feosscbii IwmitKT lnan Airmoaixm PnaoMimL Om.t shall be selected for the operation and organs, and for abnormalties in skin, (2) Containers of polyvinyl chloride It* possible exposure conditions. connective tissues and the pulmonary resin waste from reactors or other waste (3) Protective garments shall be pro system (See Appendix A). contaminated with vinyl chloride shall vided clean and dry for each use. (ID A medical history shall be taken, be legibly labeled: (D Emergency situations. A written operational plan for emergency situa tions shall be developed for each facility storing, handling, or otherwise taring vinyl chloride as a liquid or compressed including the following topics: (A) Alcohol Intake; (B) Past history of hepatitis; (C) Work history and past exposure to potential hepatotoxic agents, includ Contaminated with Turn. Chlcbide CumADwin AmR (4) Containers of polyvinyl chloride Shall be legibly labeled: gas. Appropriate portions of the plan ing drugs and chemicals; PotTTXKTL CttLoams (aa Turn Name) shall be implemented In the event of an emergency. The plan shall specifically provide that: (D) Past history of blood transfu sions; and (E> Past history of hospitalizations. Contains Vim Cklmubv Viktl CRLoams a a Cancx*-Svtrtci Ism (1) Employees engaged In hazardous operations or correcting situations of ex isting hazardous releases shall be equipped as required In paragraph (h) of this section; (2) Other employees not so equipped shall evacuate the area and not return until conditions are controlled by the methods required in paragraph <f> of this section and the emergency is abated. (Ill) A serum specimen shall be ob tained and determinations made of: (A) Total bilirubin; (B> Alkaline phosphatase; (C) Berum glutamic oxalaeetic trans aminase (SOOT); (D) - Serum glutamic pyruvic transam inase (SOFT); and (E) Gamma glustamyl transpeptidase. (2) Examinations provided In accord (fi) Containers of vinyl chloride snail be legibly labeled either: (l) Vn csistDt ZntsmT FuxKtiu Oas Ui*de* Putmi Camce*-Eu*x*ct Agent or (11) In accordance with 49 CFR Part 173. Bubpart H. with the additional legends: (J) Training. Each employee engaged In vinyl chloride or polyvinyl chloride operations shall be provided training In a program relating to the hazards of ance with this paragraph shall be per formed at least: (I) Every 6 months for each employee who has been employed In vinyl chlo Caacxa-SusPECT Aoznt applied near the labor or placard. (6) No statement shall appear on or vinyl chloride and Precautions for Its ride or polyvinyl chloride manufacturing near any required sign, label or instruc safe use. for 10 years or longer; and tion which contradicts or detracts from (1) The program shall Include: (II) Annually for all other employees. the effect of. any required warning, (i> The nature of the health hazard (2> Each employee exposed to an information or instruction. from chronic exposure to vinyl chloride emergency shall be afforded appropriate (m> Records, (l) All records main Including specifically the carcinogenic medical surveillance. tained In accordance with this section hazard: (4) A statement of each employee's shall include the name and social secu . (11) The specific nature of operations suitability for continued exposure to rity number of each employee where which could result in exposure to vinyl vinyl chloride Including use of protec relevant. chloride In excess f the permissible tive equipment and respirators, shall be (2) Records of required monitoring limit and necessary protective steps; obtained from the physician and measuring, medical records, and au- Copyright 1974 by Ths Bursou of National Affair OLI 1134 17 31.-5344B REFERENCE FILE ^^rizcd personnel rosters, shall be made shall be available upon request for examination and copying to authorised representatives of the Assistant Secre tary and the Director. <i> Monitoring and measuring records shall: (A) Bute the date of such monitor ing and measuring and the concentra tions determined and identify the instru ments and methods used; iB> Include any additional informa tion necessary to determine Individual - employee exposures where such expo sures are determined by means other than individual monitoring of employees: end tC) Be maintained for not ten than 30 years. <10 Authorized personnel rosters shall be maintained for not less than 30 years. <iii> Medical records shall be main tained for the duration of the employ ment of each employee plus 30 years, or 31 years, whichever is longer. (3) In the event that the employer ceases to do business end there is no successor to receive and retain his rec ords for the prescribed period, these rec ords shall be transmitted by registered mall to the Director, and each employee individually notified in writing of this transfer. <4) Employees or their designated representatives shall be provided access to examine and copy records of required monitoring and measuring. ,<5) Former employees shall be proled access to examine and copy re tired monitoring and measuring records reflecting their own exposures. <6> Upon written request of any em ployee-, a copy of the medical record of that employee shall be furnished to any physician designated by the employee. (n) Report*, (l) Not later than 1 month after the establishment of a reg ulated area, the following information shall be reported to the OSHA Area Di rector. Any changes to such information shall be reported within 15 days. (1) The address and location of each establishment which has one or more regulated areas; and <ii) The number of employees in each regulated area during normal operations, including maintenance. (3) Emergencies, and the facts ob tainable at that time, shall be reported within 24 hours to the OSHA Area Di rector. Upon request of the Area Direc tor, the employer shall submit additional information in writing relevant to the nature and extent of employee exposures and measures taken to prevent future emergencies of similar nature. (3) Within 10 working days following any monitoring and measuring which discloses that any employee has been exposed, without regard to the use of respirators in excess of the permissible exposure limit, each such employee shall be notified in writing of the results of exposure measurement and the steps ^King taken to reduce the exposure to ^^-lthin tile permissible exposure limit. (O) Effective dates. (1) Until Janu ary 1. 1975, the provisions currently set forth in i 1910.93q of this Part shall apply. (3) Effective January 1,1375, the pro Him capable of passing through the up visions set forth In 111101)4 of this Part shall apply. Awcnmx A Swuwbiwst iMVaOMATSDII required under paragraph Ot)(D e<f mis h tto twto should ha repeated as soon as pcac- Holds, preferably wiuun I tot walks If tasts tomato abnormal, oonaldaratsoa should be given to withdrawal of the Employs* Asm per respiratory system to reach the tower lung passages. (x1) Rotary bloat cleaning table. An MKtomn where the ptecM to be cleaned bre poHttoned on a routing table and are passed automatically through a series of Moat sprays. (xil) Abrasive blasting. The forcible at an abrasive to a surface by pneumatic pressure, hydraulic pres outset with vinyl chloride, wbllo a amro sure. or centrifugal fores. setuprbusty is mads. Additional testa which may bs nssful: `A. Vbr ktdnsy dysfunction: urine examine- Hon tor albumin, rod blood sous, and - totlaUTs abnormal osUs. (3) Dost haserA* from abrasive blast ing. 0) AbcaHvm and the surface ......................................ore Shattered and ptoPtoftod during blasting B. Pulmonary system: Forced vital sagac ity, Porosd esplratery volume at l ascend, end ebsst roentgenogram (postsrior-eu Ms IT tncbvs). O. Additional sarum torts: Luetic sold de hydrogenase, tootle add dshyttroganam operations and the tm loaned win eoui sixa. The com- of the dust from oootuurod innrnk- ^tg an evaluation of the potential health toosnsym*. pratsin determination, and basartH protein electrophoresis. D. For e mars oomprchtnalv* examination on tspsetsd abnormal s*rvun taste: Hepatitis B antigen, and Uver scanning. . (Baca. * end S. M Btet. liaa. IBM (39 UH.C. Mg. K7); Secretary of Labor's Order Bo. 19-71, M rR 8754) (19l0.93q added at 39 FR 35896. October 4, 1974| (11) The oanoentratlon of respirable duet or fume in the breathing tone of the ohrtstve-blssttng operator or any other wester shall be kept below the tovHs specified In f 1910A3. (HI) OrganicAbrasives which arc com bustible shall be used only In automatic lysteras. Where flammable or explosive dust mixtures may be present, the con 11910.94 Ventilation. struction of the equioment, ineludli-g the exhaust system and ell electric (A) Abrasive blasting--(1' Defini wiring, shall conform to the requirements tion* applicable to this paragraph.--<l) of American National Standard Installa Abrasive. A solid substance used in an tion of Blower and Exhaust Systems f r abrasive blasting operation. Dust, Stock, and Vapor Removal or Con til) Abrasive-blasting respirator. A veying. Z33.1-1961 tNFPA 81-1961). and continuous flow air-line respirator con structed so that It will cover the wearer's the National Electrical Code. NF7A 701971; ANSI C1-1971U-V.C.'Cl-1055 >. The bead, neck, and shoulders to protect hhu olast nozzle shall he banded and from rebounding abrasive. grounded to prevent the build up of (ill) Blast cleaning barrel. A complete enclosure which rotates on an axis, or which has an internal moving tread s tumble the parts. In order to expose vari ous surfaces of the parte to the action of an automatic blast spray. uvr Blast cleaning room, a complete enclosure in which Masting operations are performed and where the operator works inside of the room to operate the blasting nozzle and direct the flow of the static charges. Where flammable or ex plosive dust mixtures may be present, the abrasive blasting enclosure, the ducts, and the dust collector shill be con structed with loose panels or explosion venting areas, located on sides away from anv occupied area, to provide for pres sure relief in case of explosion, follow ing the principles set forth in the Na tional Fire Protection Association Explo sion Venting Guide. NFPA 98-1954. abrasive material. tv) Blotting cabinet. An enclosure where the operator stands outside and operates the blasting nozzle through an opening or openings in the enclosure. <H4 Clean air. Air of such purity that It will not cause harm or discomfort to an individual If it is inhaled for extended periods of time. trii) Dv-*'. oollrrrne. a device or com bination of devices for separating dust from the air' handled by on exhaust ventilation system. tvlll) Exhaust ventilation system. A system for removing contaminated air from a space, comprising two or more of the following elements (a) enclosure or hood, <b) duct work, <c> dust collect ing equipment, (d) exhauster, and (e) discharge stack. I l5l0.94(*M2)(iii) amended at 39 FR 19468, June 3, 1974] (8) Blast-cleaning enclosures. (1) . Blast-cleaning enclosures shall be ex haust ventilated in such a way tnat a continuous inward flow of air will be maintained at all openings In the en closure during the blasting operation. (a) All air inlets ana access openings Shall be baffled or so arranged that by the combination of inward air flow and baf fling the escape of abrasive or dust partteules into on adjacent work area will be minimized and visible spurts of dust will not be observed. (b) The rate of exhaust shall be suf ficient to provide prompt clearance of the dust-laden air within the enclosure after the cessation of blasting. (c> Before the enclosure is opened, the <ix) Particulate-filter respirator. An Most shall be turned off and the exhaust air purifying respirator, commonly re ferred to as a dust or a fume respirator, system shall be run for a sufficient period of time to remove the dusty air within which removes most of the dus. or fume the enclosure. from the air passing through the device. (d> Bafety glass protected by screen- (X) Resjdrable dust. Airborne dust in. ink shall be used in observation windows,. Occupational Safety & Heolth Reperl OLI 1135 18