hse professionals _ noise(hearing protection)

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How Does the Ear Work?

The ear consists of three basic parts - the outer ear, the middle ear, and the inner

Each part of the ear serves a specific purpose in the task of detecting and

interpreting sound.

The outer ear collect and channel sound to the middle ear.

The middle ears transform the energy of a sound wave into the internal

vibrations of the bone structure of the middle ear and ultimately transform these

vibrations into a compressional wave in the inner ear.

The inner ears transform the energy of a compressional wave within the inner ear

fluid into nerve impulses which can be transmitted to the brain.

How is the damage done?

•Noise damages the nerve cells that respond to sound in the inner ear, or cochlea.

•These cells work in a complex way, to give us the ability to distinguish between

sounds of different tone. So when they're damaged it doesn't just mean that you

can't hear quiet sounds –

•It has more subtle effects on the clearness of hearing.

•It is easy to understand that the vibration of extremely loud sounds causes direct

mechanical damage.

•It breaks the sub-microscopic finger- (nerve cells) that respond to sound.

•This clearness can't be restored by an electronic support.

Can I “Strengthen Up” My Ears?

No. If you think you have grown used to a loud noise, it probably has damaged

your ears. there is no treatment–no medicine, no surgery, not even a hearing

aid–that completely restores your hearing once it is damaged by noise.

What is Decibels?

•Intensity of sound is measured in decibels (dB). The scale runs from the faintest

sound the human ear can detect, which is labeled 0 dB, to over 180 dB

What decibel levels are damaging to the ear?

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by half. So for 90 dB, it's 8 hours; 95 db, 4 hours; 100 dB 2 hours, etc

========================================================================

What Are Hearing Protectors? How Effective Are They?

•Hearing protection devices decrease the intensity of sound that reaches the

eardrum. They come in two forms: earplugs and earmuffs.

•Earplugs are small inserts that fit into the outer ear canal. They must be snugly

sealed so the entire circumference of the ear canal is blocked. An improperly

fitted, dirty or worn-out plug may not seal and can irritate the ear canal.

•Earmuffs fit over the outer ear to form an air seal so the entire circumference of

the ear canal is blocked, and they are held in place by an adjustable band.

Earmuffs will not seal around long hair, and the adjustable headband tension

must be sufficient to hold earmuffs firmly around the ear.

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Who Should Wear Hearing Protectors?

If you must work in an excessively noisy environment, you should wear

protectors. You should also wear them when using power tools, noisy yard

equipment, a motorcycle, etc

Habitual exposure to noise above 85 dB will cause a gradual hearing loss in a

significant number of individuals, and louder noises will accelerate this damages

How High Can the Decibels Go without Affecting My Hearing?

•Many experts agree that continual exposure to more than 85 decibels is

dangerous without protection. And also According to Federal (OSHA) standards

•Does the Length of Time I Hear a Noise Have Anything to Do with the Danger to

My Hearing?

•It certainly does. The longer you are exposed to a loud noise, the more damaging

it may be. Also, the closer you are to the source of intense noise, the more

damaging it is.

Can Noise Affect More Than My Hearing?

•A ringing in the ears, called tinnitus, commonly occurs after noise exposure, and

it often becomes permanent. Some people react to loud noise with anxiety and

irritability, an increase in pulse rate and blood pressure, or an increase in

stomach acid. Very loud noise can reduce efficiency in performing difficult tasks

by diverting attention from the job.

All such equipment is capable of producing loud and high pitch noise, which will

eventually damage your hearing in the long run. To address this health problem,

below are some of the measures, which you can do to protect your hearing.

Noise is major health hazard. It may be defined as unwanted sound that

disturbs the mind and causes deafness.

There are number of processes in the workplace that produce excessive

noise above the permissible level of 85 dB (A). For examples, the air

compressor, forklift, crane, and gouging work.

At such noise level, 2 persons, about 1 metre, away need to shout at each

other to be heard.

Excessive noise level (above 85 dB (A)) can cause deafness over a period of

time, usually over 5 years. This is called Noise Induced Deafness (NID)

is irreversible, thus the importance of prevention should not be overlooked.

There are two methods of preventing NID, one is to control it at source,

that is, at the point where noise is being generated; the other one is to

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6. Controlling noise at source includes regular maintaining and repairing

machinery and equipment, use of anti-vibration mountings, use of silencer

etc.

Two ways of protecting the workers are:

· Use of earplugs: Reduce noises about 20 dB (A).

· Use of earmuff: Reduce noises about 40 dB (A).

Here are some of the simple Do’s and Don’ts that will help to prevent Noise

Induced Deafness at work:

DO Clean re-usable ear plugs regularly after use and in the interests of

hygiene, don’t share them with your workmates.

DO Report any damaged or defective ear plugs immediately to your

supervisor. Otherwise other people could pick up and use them.

DO make sure your ear plugs are comfortable as well as effective. If they’re

uncomfortable, you’ll only be tempted to put them to one side and

not use them.

DO throw away all disposable ear plugs immediately after use. If you keep

on using them, they won’t provide you with proper protection and if

dirty, may lead to ear infection.

DO read and obey all safety signs and around the workplace. So if a sign

tells you to wear ear protection devices in a certain area, make sure

you do it!

DON’T try to make your own earplugs by stuffing your ears with materials like

cotton wool. Use the proper ear protection provided.

DON’T be tempted to take off your ear defenders in working areas, even for

short periods. Just a few minutes of exposure to harmful noise levels

could damage your hearing permanently.

DON’T misuse or damage your ear plugs. Store them safely and only use them

for their proper purpose.

DON’T use dirty hands to insert or change ear plugs – always wash them first.

DON’T try to bend ear muffs to make them more comfortable on your head.

It’ll only reduce the effectiveness of the seal and let harmful noise in.

The effectiveness of noise reduction of ear plugs and ear muffs is affected by the proper use and

regular maintenance.

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Hasan Mohammadi · Gach Saran, Kohgīlūyeh Va Būyer Aḩmad, Iran

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hse professionals _ noise(hearing protection)

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