Alex Simovski - WorkSafe · PDF fileAlex Simovski . Senior Occupational Hygienist . ... Jet...
Transcript of Alex Simovski - WorkSafe · PDF fileAlex Simovski . Senior Occupational Hygienist . ... Jet...
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Alex Simovski Senior Occupational Hygienist Worksafe Victoria
Noise Control – It’s not as hard as you think!
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HIERARCHY OF CONTROLS [OHS REGS 2007]
WORKSAFE FOCUS
ELIMINATION
SUBSTITUTION
ENGINEERING CONTROLS
ADMINISTRATIVE
HEARING PROTECTORS
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NOISE CONTROL DEMONSTRATIONS Enclosures & barriers Fan & ventilation noise Compressed air noise Impact, vibration & materials handling noise Circular saws Grinders
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ENCLOSURES & BARRIERS Enclose noise source or operator (eg control room) Select suitable materials (eg sheet metal, glass, perspex, masonry, MDF ) Line at least 50% internal area with absorbent material
(eg 50mm high density foam, glass wool ,rockwool) Protect absorbent material if required
(eg thin plastic or perforated sheetmetal (min 25% open)) Seal / minimise any gaps Install vibration isolation mounts Avoid rigid connections b/n machine, ducts, pipes & enclosure Ensure any hatches / doors / windows are well sealed Line access/ventilation chutes with absorbent material (min 3X Duct diam) Use quiet fans if mechanical ventilation required Move any controls outside enclosure
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FAN & VENTILATION NOISE
Quieter fans (eg different blade profile, backward curved) Reduce fan speed (eg 20% slower – 5 dB reduction) Acoustically lined duct silencer Isolation mounts & flexible connections Dampen fan casing / thicker casing Improve ductwork layout for smoother/quieter flow Maintenance (motor, shaft, bearings, belts, tighten etc)
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COMPRESSED AIR Compressor - purchase quiet compressor (eg screw type)
- modify / relocate / enclose - install isolation mounts
Jet air noise - reduce velocity
- use quiet compressed air gun / nozzle
Pneumatic exhaust - silencers / quiet nozzles / expansion chambers / mufflers - re-direct exhaust air outside
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IMPACT, VIBRATION & MATERIALS HANDLING NOISE Reduce transfer speeds Reduce drop height / angle imact Cushion impact (eg rubber liner) Dampen metal panels, chutes, hoppers (single / sandwich) Stiffen/brace vibrating panels & dampen Change nature of materials (wire mesh, plastic, heavier material) Install isolation mounts / flexible connections Clamp materials being cut /ground/impacted Use conveyors that prevent transported objects striking each other Use inherently dampened gears that mesh well (brass/helical) Use conveyor belts instead of metal rollers (generally quieter) Increase mass of work benches to deaden impact noise Use cutting edge tooling on punch presses to reduce impact
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CIRCULAR SAWS Use quieter cutting process (eg guillotine, power hack saw) Purchase pre-cut to eliminate/reduce need for cutting Use quieter saw (more teeth, smaller gullets, dampened) Use saw with quieter motor Tungsten carbide teeth– stay sharper longer Relocate noisy cutting work Clamp work-piece ( eg aluminium extrusions) Full / partial enclosure or barriers Sharpen /lubricate / maintain saw Guards may be acoustically lined on some saws
teeth
gullets
damping
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GRINDERS Review/improve process to eliminate/reduce need
for grinding Use smaller grinders Quieter grinder, discs or linisher Clamp/dampen work piece Barriers to screen direct noise Relocate noisy grinding process Reschedule noisy grinding work Job rotation to reduce duration of exposure Hearing protection
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WHERE DO I START?
HELP!!
APPLY/TRIAL SIMPLE FIXES
ID NOISE CONTROL OPTIONS
RE-EVALUATE EXPOSURE
NFA CONSULTANTS
ID /RANK MAJOR NOISE SOURCES
GUIDANCE
EXCESSIVE?
Worksafe B&K Noise control booklet HSE
NO YES
NOT SURE
ASSESS / FURTHER CONTROLS
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Thank you.