ventilation. dust hazards created by abrasive blasting v how respirable dust is formed v composition...

VentilationVentilation

Dust hazards created by Dust hazards created by abrasive blastingabrasive blasting

How respirable dust is formedHow respirable dust is formed

Composition and toxicityComposition and toxicity

Review exposure limits in 29 CFR Review exposure limits in 29 CFR 1910.10001910.1000

1a

Dust hazards created by Dust hazards created by abrasive blastingabrasive blasting

Organic abrasivesOrganic abrasives

Flammable or explosive dustFlammable or explosive dust

1b

Blast-cleaning enclosuresBlast-cleaning enclosures

Exhaust ventilationExhaust ventilation

Baffling air inlets and access Baffling air inlets and access openingsopenings

Rate of exhaustRate of exhaust

2a


Before opening:Before opening:• blast must be turned offblast must be turned off• exhaust system must be runexhaust system must be run

Protection for observation windowsProtection for observation windows

Slit abrasive-resistant bafflesSlit abrasive-resistant baffles

2b


DoorsDoors• must be flanged and tight when must be flanged and tight when

closedclosed• must be operable from both inside must be operable from both inside

and outsideand outside

2c

Inspection & maintenance of Inspection & maintenance of exhaust systemsexhaust systems

Z9.2-1960, and ANSI Z33.1-1961Z9.2-1960, and ANSI Z33.1-1961

Dust leaks must be repaired ASAPDust leaks must be repaired ASAP

Static pressure drop at the exhaust Static pressure drop at the exhaust ductsducts

3a

Inspection & maintenance of Inspection & maintenance of exhaust systemsexhaust systems

Installations where the abrasive is Installations where the abrasive is recirculatedrecirculated

Dust collectorsDust collectors

3b

Personal Protective Personal Protective EquipmentEquipment

Abrasive-blasting respirators must Abrasive-blasting respirators must be worn:be worn:• inside blast cleaning roomsinside blast cleaning rooms• when using silica sandwhen using silica sand• when toxic dust exceeds when toxic dust exceeds

exposure limitsexposure limits

Dust filter respiratorsDust filter respirators

4a

Personal Protective Personal Protective EquipmentEquipment

Heavy canvas or leather gloves Heavy canvas or leather gloves and apronsand aprons

Safety shoesSafety shoes

Eye and face Eye and face protectionprotection

4b

Air quality for abrasive-Air quality for abrasive-blasting respiratorsblasting respirators

Free of harmful quantities of dusts, Free of harmful quantities of dusts, mists, or noxious gasesmists, or noxious gases

Meets requirements in 29 CFR Meets requirements in 29 CFR 1910.134(i)1910.134(i)

5a

Operating procedures and Operating procedures and general safetygeneral safety

Dust must not accumulate on the floor or ledges outside of an abrasive-blasting enclosure

Dust spills must be cleaned up promptly

Keep aisles and walkways clear

6a

Grinding, polishing, and Grinding, polishing, and buffing operationsbuffing operations

Local exhaust ventilation systemsLocal exhaust ventilation systems• Remove dust, dirt, fumes, and gasesRemove dust, dirt, fumes, and gases• Required when employee exposure Required when employee exposure

exceeds permissible exposure limitsexceeds permissible exposure limits

7a

Grinding, polishing, and Grinding, polishing, and buffing operations buffing operations

Hood and branch pipe Hood and branch pipe requirementsrequirements• Design and placement so particles fall Design and placement so particles fall

or are projected into the hoodsor are projected into the hoods• Operation must not cause particles to Operation must not cause particles to

be thrown into the operators be thrown into the operators breathing zonebreathing zone

• Follow specified exhaust volumesFollow specified exhaust volumes

8a

Grinding, polishing, and Grinding, polishing, and buffing operationsbuffing operations

Exhaust system requirementsExhaust system requirements• Designed and tested in accordance Designed and tested in accordance

with American Standard with American Standard Fundamentals Governing the Design Fundamentals Governing the Design and Operation of Local Exhaust and Operation of Local Exhaust Systems, Z9.2-1960Systems, Z9.2-1960

• All exhaust systems must be provided All exhaust systems must be provided with suitable dust collectorswith suitable dust collectors

9a

Hood and enclosure Hood and enclosure designdesign

Functions to:Functions to:• Protect the operator from the hazards Protect the operator from the hazards

of bursting wheels, andof bursting wheels, and• Provide a means for the removal of Provide a means for the removal of

dust and dirt generated dust and dirt generated

Structural strength Structural strength

10a


Adaptable to particular machineAdaptable to particular machine

Exhaust hoods for floor stands, Exhaust hoods for floor stands, pedestals, and bench grinders pedestals, and bench grinders must be designed in accordance must be designed in accordance with figure G-2 of 1910.94(b)with figure G-2 of 1910.94(b)

10b


Swing-frame grinders must be Swing-frame grinders must be provided with exhaust booths as provided with exhaust booths as indicated in figure G-3 of indicated in figure G-3 of 1910.94(b)1910.94(b)

10c


Portable grinding operations, Portable grinding operations, whenever the nature of the work whenever the nature of the work permits, must be conducted within permits, must be conducted within a a partial enclosurepartial enclosure

10d


Hoods for polishing and buffing Hoods for polishing and buffing and scratch-brush wheels must be and scratch-brush wheels must be constructed to conform as closely constructed to conform as closely to figure G-4 of 1910.94(b) as the to figure G-4 of 1910.94(b) as the nature of the work will permitnature of the work will permit

10e


Cradle grinding and polishing Cradle grinding and polishing operations must be performed operations must be performed within a partial enclosure similar to within a partial enclosure similar to figure G-5 of 1910.94(b)figure G-5 of 1910.94(b)

10f


Hoods for horizontal single-spindle Hoods for horizontal single-spindle disc grinders must be constructed disc grinders must be constructed to conform as closely as possible to conform as closely as possible to the hood shown in figure G-6 of to the hood shown in figure G-6 of 1910.94(b)1910.94(b)

10g


Horizontal double-spindle disc Horizontal double-spindle disc grinders must have a hood grinders must have a hood encircling the wheels and grinding encircling the wheels and grinding chamber similar to that illustrated chamber similar to that illustrated in figure G-7 of 1910.94(b)in figure G-7 of 1910.94(b)

10h


Vertical-spindle disc grinders must Vertical-spindle disc grinders must be encircled with a hood so be encircled with a hood so constructed thatconstructed that• the heavy dust is drawn off a surface the heavy dust is drawn off a surface

of the discof the disc• the lighter dust exhausted through a the lighter dust exhausted through a

continuous slot at the top of the hood continuous slot at the top of the hood as shown in figure G-1 of 1910.94(b)as shown in figure G-1 of 1910.94(b)

10i


Grinding and polishing belt hoodsGrinding and polishing belt hoods• must be constructed as close to the must be constructed as close to the

operation as possibleoperation as possible• the hood should extend almost to the the hood should extend almost to the

beltbelt• one-inch wide openings are provided one-inch wide openings are provided

on either sideon either side

10j

Operations considered to Operations considered to be spray finishingbe spray finishing

Methods wherein organic or Methods wherein organic or inorganic materials are utilized in inorganic materials are utilized in dispersed form for deposit on dispersed form for deposit on surfaces to be coated, treated, or surfaces to be coated, treated, or cleanedcleaned

May involve either automatic, May involve either automatic, manual, or electrostatic depositionmanual, or electrostatic deposition

11a

Operations considered to Operations considered to be spray finishingbe spray finishing

Does not include:Does not include:• metal spraying or metallizingmetal spraying or metallizing• dippingdipping• flow coatingflow coating• roller coatingroller coating• tumblingtumbling• centrifugingcentrifuging• spray washing and degreasing systemsspray washing and degreasing systems

11b

Location and use of spray Location and use of spray boothsbooths

Enclose or confine all operationsEnclose or confine all operations

12a

Must be located as provided in Must be located as provided in sections 201 through 206 of the sections 201 through 206 of the Standard for Spray Finishing Using Standard for Spray Finishing Using Flammable and Combustible Flammable and Combustible Materials, NFPA No. 33-1969Materials, NFPA No. 33-1969


12b


Used to enclose or confine all Used to enclose or confine all spray finishing operations covered spray finishing operations covered by 29 CFR 1910.94by 29 CFR 1910.94

TermsTerms• Spray boothSpray booth• Spray roomSpray room

12c

Design and construction of Design and construction of spray boothsspray booths

29 CFR 1910.107(b)(1)-(4) and (6)-29 CFR 1910.107(b)(1)-(4) and (6)-(10)(10)

ANSI ANSI Z9.2-1960Z9.2-1960

13a


Lights, motors, electrical equipment, Lights, motors, electrical equipment, and other sources of ignition must and other sources of ignition must conform to the requirements of 29 conform to the requirements of 29 CFR 1910.107(b)(10) and (c)CFR 1910.107(b)(10) and (c)

In no case must combustible material In no case must combustible material be used in the constructionbe used in the construction

13b


WalkwaysWalkways

Baffles, distribution plates and dry-Baffles, distribution plates and dry-type overspray collectorstype overspray collectors

Wet or water wash spray boothsWet or water wash spray booths

13c


Collecting tanksCollecting tanks

Pump manifolds, risers, and Pump manifolds, risers, and headersheaders

13d

Design and construction of Design and construction of spray roomsspray rooms

Must be constructed of masonry, Must be constructed of masonry, concrete, or other noncombustible concrete, or other noncombustible materialmaterial

Must have noncombustible fire Must have noncombustible fire doors and shuttersdoors and shutters

13e


Adequate ventilationAdequate ventilation• the atmosphere in the breathing zone the atmosphere in the breathing zone

of the operator must be maintained in of the operator must be maintained in accordance with the requirements of accordance with the requirements of 29 CFR 1910.94(c)(6)(ii)29 CFR 1910.94(c)(6)(ii)

13f


Spray rooms used for production Spray rooms used for production spray-finishing operations must spray-finishing operations must conform to the requirements for conform to the requirements for spray boothsspray booths

13g

Ventilation during spray Ventilation during spray finishing operationsfinishing operations

Ventilation must be provided in Ventilation must be provided in accordance with provisions of 29 accordance with provisions of 29 CFR 1910.107(d)CFR 1910.107(d)

14a


Where a fan plenum is used it Where a fan plenum is used it must be of sufficient strength or must be of sufficient strength or rigidity to withstand the differential rigidity to withstand the differential air pressure or other superficially air pressure or other superficially imposed loads for which the imposed loads for which the equipment is designed and also to equipment is designed and also to facilitate cleaning - 29 CFR facilitate cleaning - 29 CFR 1910.94(c)(5)(iii)1910.94(c)(5)(iii)

14b


Inlet ductworkInlet ductwork

Exhaust ductworkExhaust ductwork

14c

Velocity and air flow Velocity and air flow requirementsrequirements

Except where a spray booth has an Except where a spray booth has an adequate air replacement system, adequate air replacement system, the velocity of air into all openings the velocity of air into all openings of a spray booth must be not less of a spray booth must be not less than that specified in Table G-10 of than that specified in Table G-10 of 29 CFR 1910.94(c) for the 29 CFR 1910.94(c) for the operating conditions specifiedoperating conditions specified

15a


Adequate air replacement systemAdequate air replacement system

Total air volumeTotal air volume

15b


Respirator is required when the Respirator is required when the operator is downstream from the operator is downstream from the object being sprayedobject being sprayed

Downdraft booth doors must be Downdraft booth doors must be closed when spray paintingclosed when spray painting

15c

Make-up air in spray Make-up air in spray finishing operationsfinishing operations

Clean fresh air must be supplied to Clean fresh air must be supplied to a spray booth or room in quantities a spray booth or room in quantities equal to the volume of air equal to the volume of air exhausted through the spray boothexhausted through the spray booth

16a

Make-up air in spray Make-up air in spray finishing operationsfinishing operations

Self-closing doors, dampers, or Self-closing doors, dampers, or louverslouvers

Filtered air supplyFiltered air supply

Heating make-up airHeating make-up air

16b

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