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Please read this before using presentation. This presentation is based on content presented at the 2007 Mines Safety Roadshow held in October 2007

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Please read this before using presentation

Please read this before using presentation

  • This presentation is based on content presented at the 2007 Mines Safety Roadshow held in October 2007

  • It is made available for non-commercial use (eg toolbox meetings) subject to the condition that the PowerPoint file is not altered without permission from Resources Safety

  • Supporting resources, such as brochures and posters, are available from Resources Safety

  • For resources, information or clarification, please contact:

    [email protected]

    or visit

    www.docep.wa.gov.au/ResourcesSafety


Toolbox presentation occupation noise in the wa mining industry

Toolbox presentation: Occupation noise in the WA mining industry

October 2007


Noise legislation

Noise legislation

  • Mines Safety and Inspection Act 1994 — Section 9

  • Mines Safety and Inspection Regulations 1995 — Part 7 Division 1

  • Approved Procedures — Regulations 7.6 and 7.10


Background

Background

  • Apply to over 300 mines operating in WA

  • Cover more than 56,500 miners

  • Majority of miners work 12-hour shifts

  • Over 74% of miners are overexposed to noise


Basic rules of working with noise

Basic rules of working with noise

  • The noise levels are described in decibels (dB)

  • They can not be added or subtracted in the usual arithmetic way because the dB scale is logarithmic

  • Two identical tools emitting noise of 90 dB(A) produce the combined noise level of 93 dB(A), not 180 dB(A)


Basic rules of working with noise cont

Basic rules of working with noise cont.

  • A 3 dB(A) increase corresponds to a doubling of sound energy

  • A 10 dB(A) increase corresponds to a 10 times increase of the sound energy

  • A 20 dB(A) increase corresponds to a 100 times increase of the sound energy


Typical noise levels at operator s ear level

Typical noise levels at operator’s ear level


Standard for occupational noise

Standard for occupational noise

  • For noise exposure — 85 dB(A) for 8 hours

  • For peak noise level — 140 dB(lin)


Average noise exposure in wa mining industry

Average noise exposure in WA mining industry


Employee hearing loss by occupation group

Employee hearing loss by occupation group

Percentage of employees with hearing loss >5%

  • Surface mining19.2%

  • Metal trades18.6%

  • Processing plants16.0%

  • Underground mining15.5%

  • Management14.4%

  • Electrical trades10.6%


Relationship between noise exposure and hearing loss

Relationship between noise exposureand hearing loss

Hearing loss between 5 and 9%


Employee hearing loss

Employee hearing loss

Average threshold shifts


Steps aiming to control noise at work

Steps aiming to control noise at work

  • Assess risks to develop a noise control plan

  • Reduce risks for all employees

  • Investigate and implement good practice for control of noise

  • Prioritise noise control measures

  • Use hearing protection for residual risks

  • Carry out a noise dosimetry program to check the effectiveness of noise control measures


Some simple noise control techniques

Some simple noise control techniques

  • Application of damping material to chutes, hoppers, machine guards etc., can give a 5-25 dB reduction in the noise radiated

  • Cabin internal noise can be reduced by 10-12 dB by applying damping pads and sound barrier mats to floor and engine bulkhead

  • Reduce fan speed by 30% to achieve a noise reduction of 8 dB


Noise control can be complex

Noise control can be complex

Engage employees in process

Use noise control consultants to help solve your problems if complex


Hearing protectors

Hearing protectors

  • Selected for protection, user preference and work activity

  • Guard against over-protection — isolation can lead to under-use and safety risks

  • Require information, instruction, training, supervision and motivation

  • Will only protect if worn all the time and properly


Rating hearing protectors

Rating hearing protectors

The sound level conversion (SLC80 )rating of a hearing protector, ear plugs or headset is a simple number and class rating that is derived from a test procedure as outlined in the Australian/New Zealand Standard AS/NZS 1270:2002


Class and specification of hearing protectors

Class and specification of hearing protectors


Ear plugs

Ear plugs

Properly fitted

Wrongly fitted


Ear muffs

Ear muffs

Proper clamping force

Worn-out head band


Reduction in protection provided by hearing protectors with decreased wearing time

Reduction in protection provided by hearing protectors with decreased wearing time

Example: Effectiveness of wearing an ear muff with a rating of 30 dB for an exposure time of one hour


Our challenge

Our challenge

Away from …

  • Noise assessment as the end point

  • Reliance on hearing protection

    Towards …

  • Control of noise risks through prioritised action plans

  • Introducing equipment with good noise and vibration characteristics – ‘Buy Quiet’


Please read this before using presentation

Use this guideline as a reference on recommended ways to control noise in mines


Please read this before using presentation

Noise posters available online or

as hardcopies (contact Resources Safety)


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