Hearing Conservation_Noise Control-L_I v1.ppt

7/27/2019 Hearing Conservation_Noise Control-L_I v1.ppt

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Hearing Conservationand Noise Control

Bureau of Workers Comp

PA Training for Health & Safety(PATHS)

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29 CFR 1910.95


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Why??????

Its the LAW

Quality of Life

Gradual/Painless

Huh?What?

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Anatomy of the Ear

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Types of Hearing Loss

Conductive Occurs in ear canal, drum, ossicles

Central Damage to auditory nerve

Sensorineural Nerve damage in cochlea

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Health Effects OtherThan Hearing Loss

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Degree of Risk

Frequency How oftenworkers exposed

Intensity How loud

Duration How long

Individual Variability Persons resistance

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How Loud is Loud?

Jet engine 140 db

Threshold of Pain 125 db

Pneumatic hammer 110 db

Compressed Air 105+ db

Punch Press 95 db

Lawn Mower 90 db Conversation 65 db

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Hearing Protective EquipmentAdvantages/Disadvantages

Cotton Balls Virtually no protection

Canal Blockers/Ear Pods Only coveropening of ear canal

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Hearing Protective EquipmentAdvantages/Disadvantages

Ear Muffs Good overallprotection

Ear Plugs Can be difficult toinsert & annoying to wear

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How to Insert Earplugs

1. Roll the earplug into a tight cylinder

2. Lift the top of your ear to open the canal

3. Insert earplug into the open canal

4. Hold earplug in place until the foam expands

5. Repeat Steps 1 4 to insert into other ear

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Safety Factor =Noise Reduction Rating

OSHA protocol

For A scale measurements, NRR minus 7

Example:

Noise exposure = 92 dBA

Manufacturers NRR = 15

15 7 = 8 (effective noise exposure reduction)92 8 = 84 dBA

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NRR Determination:more from OSHA

If using dB(A) scale: Noise level minus [NRRminus 7 divided by 2] = Noise level at earex. Noise level = 98 dBA NRR = 25 dBA98 - [25-7/2=9] = 98-9=89dB.

If using dB(C) scale: Noise level minus [NRRdivided by two] = Noise level at earex. Noise level = 98 dBA NRR = 25 dBA98 [25/2=12.5] = 98-12.5=85.5 dB.

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Exposure Limits Time Weighted Average (TWA)

Time Weighted Average Sound Level:

That sound level, which if constant over an 8

hour exposure, would result in the same dose

as is measured.

To determine TWA if working in different areaswith different noise level readings over 8 hour

work shift :

Use 1910.95, Appendix A, Table G-16A

Table A-1

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OSHAs PermissibleNoise Exposure*

90 dB = 8.0 hours

92 dB = 6.0 hours

95 dB = 4.0 hours

97 dB = 3.0 hours

100 dB = 2.0 hours

102 dB = 1.5 hours

105 dB = 1.0 hours110 dB = 30 minutes

115 dB = 15 minutes

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*At or above = controls: Engineering, Administrative, PPE


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Exposure Limits

If exposure to 8 hour Time Weighted Average (TWA):

ACGIH 85 dBA (action level)

NIOSH 85 dBA (action level)

OSHA

84 dBA: nothing required85 89 dBA:

- monitoring

- testing

- protection- training

- recordkeeping

90 dBA (Permissible Noise Exposure Limit)

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Noise Monitoring

Required by the OSHA standard to

identify all noise at or above 85 dBA

Monitoring must be performedwhenever there is an increase in

production or equipment is addedthat could increase the noise level

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Audiograms

Audiograms are requiredevery year to identify ifthere has been a loss ofhearing.

The solid line shows anormal result with nohearing loss. The dotted

line represents a typicalnoise induced hearingloss (NIHL).

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Training Requirements

Annual Training

Hearing Conservation Elements

Hearing Protectors

HearingConservation

Program

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Recordkeeping

Monitoring records

(Keep for 2 years)

Audiometric testing records

(Keep for period ofemployment)

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Noise Control

Engineering (e.g. sound barriers)

Administrative (e.g. worker rotation)

Personal Protective Equipment (e.g.

ear plugs, ear muffs)

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What is your Company doing toControl Exposure:

Monitoring?

Engineering?

Administrative? PPE?

If youre not sure you should checkwith your Supervisor!

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Questions?

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Hearing Conservation_Noise Control-L_I v1.ppt

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