industrial noise and hearing conservation
DESCRIPTION
It is estimated that each year there are thirty million people to dangerous levels of noise in the workplace. However, hearing loss caused by excessive and dangerously high levels of noise is one hundred percent preventable. Thanks to the successful application of controlled technology and protection programs of hearing, hearing may be saved. For details please check here:http://www.greenwgroup.com/TRANSCRIPT
Industrial noise and
Hearing conservation
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WHAT IS NOISE
Simply stated… noise is any
unwanted sound.
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Ways to characterize of noise
FREQUENCY- perceived as pitch
INTENSITY- perceived as loudness
NATURE- steady-state vs. impulse
DURATION- length of time exposed
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Noise Induced Hearing Loss
Initially, exposure to noise causes a
loss of sensitivity to high frequency
(high pitch) sound.
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Noise Induced Hearing Loss
One can experience progressive
high frequency hearing loss and not
be aware of it until it becomes
severe.
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How can it happen
Acoustic trauma – one time exposure to
loud sound.
Daily exposures to moderately loud
sounds.
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Effects of noise on hearing
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When noise is scientifically defined to
be a hazard?
Duration of exposure
Repeated exposure
85dBA for steady-state noise
sources
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Proper Use of Hearing Protection
It takes just a few minutes of
unprotected exposure at noise
above 115 decibels to risk hearing
damage.
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Proper Use of Hearing Protection
Earplugs not well inserted into the ear
canal will not provide complete
protection.
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How do we know something is too loud?
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How do we know something is too loud?
If you have to raise your voice to be
heard by someone standing within 3 foot
(arm’s length) then the level is most
likely above the hazardous noise level.
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How do we know something is too loud?
Objectively measure loudness with
proper equipment
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Noise Levels Examples
Equipment Noise Level
Trimmer
Edger
Chain Saw
Jackhammer
92.0 decibels
94.5 decibels
110 decibels
112 decibels
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Annual Hearing Testing
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Annual Hearing Testing
Why do annually
Feedback BEFORE it becomes a
problem. not five years down the
road when it definitely is a
problem.
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Annual Hearing Testing
What is your score
Are you practicing good
hearing conservation or
aren’t you
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Noise reduction rating (nrr)
All hearing protection devices have
a Noise Reduction Rating (NRR)
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Fitting Technique
Noise muffs should seal around
the ear
Replace ear cushions when
cracked or worn
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http://www.greenwgroup.com/
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