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Please read this before using presentation. This presentation is based on content presented at the Mines Safety Roadshow held in October 2008 and Exploration Safety Roadshow held in November 2008

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Presentation Transcript
Please read this before using presentation
Please read this before using presentation

  • This presentation is based on content presented at the Mines Safety Roadshow held in October 2008 and Exploration Safety Roadshow held in November 2008

  • It is made available for non-commercial use (e.g. 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:

    ResourcesSafety@docep.wa.gov.au

    or visit

    www.docep.wa.gov.au/ResourcesSafety


Toolbox presentation how can we stop noise damaging hearing

Toolbox presentation: How can we stop noise damaging hearing


Outline
Outline

3

  • Why is protecting our hearing important?

  • Terminology and setting the scene

  • Signs of NIHL

  • How much noise?

  • Managing noise

  • PPE

    NIHL = noise-induced hearing loss


What is the impact of nihl
What is the impact of NIHL?

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Recognising NIHL

Everyone appears to be mumbling

Can’t hear conversations at home or work

May misinterpret what many people say

Have to ask people to repeat what they said – then they yell

Consequences

Hearing loss is insidious and irreversible

Affects quality of life and is extremely isolating

Increased opportunity for miscommunication (potential for poor outcomes)


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)

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Basic rules of working with noise continued
Basic rules of working with noise (continued)

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

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

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

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Standard for occupational noise
Standard for occupational noise

Noise exposure — 85 dB(A) for 8 hours

Peak noise level — 140 dB(lin)

If you can’t hear speech one metre from source then background noise is too loud – exceeds 85 dB(A)

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Incidence of hearing loss
Incidence of hearing loss

NIOSH (USA) reports that 49% of male, metal/non-metal miners will have a hearing impairment by age 50 (versus 9% for general population), rising to 70% by age 60

About 50% of WA mining employees between 40 and 50 years old have a significant threshold hearing shift – increases to 82% for those aged 50 and above

Significant hearing threshold shifts > 20 dB(A) across both ears at 3,4 and 6 kHz


Examples of potential noise hazards
Examples of potential noise hazards

Mining

Jumbo drilling

Angle grinding

Ball mills

Mobile plant

Exploration

High pressure air-booster

RC drilling causes greater high impact noise

Diamond drilling - high frequencies


Some risk factors
Some risk factors

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Duration and frequency of exposure

  • Tasks involving repetitive or sustained exposure to noise

    Peak noise

  • Tasks with sudden loud noise (acoustic shock)

    Communication requirements

  • Tasks that require communication between or to and from workers in noisy places


Addressing risk factors
Addressing risk factors

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Employer’s responsibility to reduce noise as much as possible (ALARP) – assess workplace noise, develop and implement noise control plan

Employee’s responsibility to comply with noise management procedures

Control measures developed by consultative process

Role of safety and health representatives


Risk management approach
Risk management approach

15

Hierarchy of controls

  • Elimination

  • Substitution

  • Isolation

  • Engineering

  • Administrative

  • PPE

    Ultimate aim of risk management is elimination of hazards, and PPE is used as a last resort

    More than one measure may be used to reduce exposure to hazard


Noise hazards focus on the controls
Noise hazards – focus on the controls

Undertake noise surveys of all equipment under usual operating conditions

Noise footprint of equipment – show which parts should be avoided on a laminated A4 sheet

Implement engineer controls prior to commissioning equipment

Appropriate PPE can be supplied based on noise survey

Consulting employees on their preferences on fit and comfort will improve their effectiveness as they will be used properly


Risk management approach continued
Risk management approach (continued)

17

Design options – do it right from the start

  • ‘Buy Quiet’ programs – look for good noise and vibration characteristics

  • Workshop layout

    • Doubling distance from noise will halve noise level received by ear

    • Avoid work areas in corners with reflective surfaces

      Substitution, isolation and engineering options

  • Use damping materials and sound barriers

  • Change activity (e.g. reduce fan speed)


Please read this before using presentation

Noise control – design


Please read this before using presentation

Noise control – design


Ppe hearing protection considerations
PPE – hearing protection considerations

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Chosen for task – beware under- and over-protection issues

Fit tested

Provide information and instruction

Maintained – and replaced as necessary

Worn before entering noisy area – and left on

Used correctly

Address communication issues – workers should not be removing protection in noisy areas to talk to each other or speak on radios or phones


Reduction in protection with decreased wearing time
Reduction in protection with decreased wearing time

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

If earmuff removed or lifted to speak to fellow worker for total of 5 minutes in the one hour period, effective attenuation is 11 dB!

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