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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



Noise legislation
Noise legislation industry

  • 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 industry

  • 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 industry

  • 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 industrycont.

  • 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



Standard for occupational noise
Standard for occupational noise industry

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

  • For peak noise level — 140 dB(lin)



Employee hearing loss by occupation group
Employee hearing loss by occupation group industry

Percentage of employees with hearing loss >5%

  • Surface mining 19.2%

  • Metal trades 18.6%

  • Processing plants 16.0%

  • Underground mining 15.5%

  • Management 14.4%

  • Electrical trades 10.6%


Relationship between noise exposure and hearing loss
Relationship between noise exposure industryand hearing loss

Hearing loss between 5 and 9%


Employee hearing loss
Employee hearing loss industry

Average threshold shifts


Steps aiming to control noise at work
Steps aiming to control noise at work industry

  • 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 industry

  • 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 industry

Engage employees in process

Use noise control consultants to help solve your problems if complex


Hearing protectors
Hearing protectors industry

  • 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 industry

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



Ear plugs
Ear plugs industry

Properly fitted

Wrongly fitted


Ear muffs
Ear muffs industry

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 decreased wearing time

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’



Noise posters available online or control noise in mines

as hardcopies (contact Resources Safety)


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