1 PPT01703 Bureau of Workers Compensation PA Training for Health amp Safety PATHS 29 CFR 191095 Why Hearing Conservation Its the LAW Quality of Life ID: 909943
Download Presentation The PPT/PDF document "Hearing Conservation & Noise Control" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Hearing Conservation & Noise Control
1
PPT-017-03
Bureau of Workers’ Compensation PA Training for Health & Safety (PATHS)
29 CFR 1910.95
Slide2Why Hearing Conservation?
It’s the “LAW”Quality of LifeHearing Loss is Gradual/Painless
2
PPT-017-03
Huh? What?
Slide3Anatomy of the Ear
3
PPT-017-03
Slide4Types of Hearing Loss
Conductive – Occurs in ear canal, drum, ossiclesCentral – Damage to auditory nerveSensorineural – Nerve damage in cochlea
4
PPT-017-03
Slide5Other Health Affected
5
PPT-017-03
Slide6Degree of Risk
Frequency – How often workers exposedIntensity – How loudDuration – How longIndividual Variability – Person’s resistance
6
PPT-017-03
Slide7Decibel
The ear has the remarkable ability to handle an enormous range of sound levels. In order to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one. This scale is the decibel scale used to express the ratio of two values of a physical quantity, often power or intensity (in this case, sound).Zero decibels (0 dB) is the quietest sound audible to a healthy human ear. From there, every increase of 3 dB represents a doubling of sound intensity, or acoustic power.
7
PPT-017-03
Slide8How Loud is Loud?
Jet engine 140 dbThreshold of Pain 125 dbPneumatic hammer 110 dbCompressed Air 105+ dbPunch Press 95 dbLawn Mower 90 dbConversation 65 db
8
PPT-017-03
Slide9Hearing Protection
Advantages and DisadvantagesCotton Balls – Virtually no protection Canal Blockers/Ear Pods – Very convenient for intermittent noiseReadily available around neck when not in useOnly cover opening of ear canal Lower attenuation than most earplugsSome noise transmission through band
9
PPT-017-03
Slide10Care & Maintenance
Canal Blockers/Ear PodsCheck before each use for damageClean and replace pods regularlyDo not overstretch band
10
PPT-017-03
Slide11Hearing Protective Equipment
Advantages and DisadvantagesEar PlugsComfortable for extended useDisposable earplugs availableCooler in hot/humid environmentsSingle-use foam plugs can provide highest levels of attenuationCan be difficult to insert & annoying to wear
11
PPT-017-03
Slide12How to Insert Earplugs
Roll the earplug into a tight cylinder 2. Lift the top of your ear to open the canal3. Insert earplug into the open canal4. Hold earplug in place until the foam expands5. Repeat Steps 1 – 4 to insert into other ear
12
PPT-017-03
Slide13Care/Maintenance Earplugs
Dispose of single-use earplugs dailyClean multiple-use earplugs with mild soap and water, dry thoroughlyInspect multiple-use earplugs for dirt, cracks or hardness, replace if damaged
13
PPT-017-03
Slide14Hearing Protective Equipment
Advantages and DisadvantagesEar MuffsEasy to get proper fitGood for intermittent noiseRadio & electronic optionsCan feel hot/heavy with extended wearMust determine compatibility with other PPE
14
PPT-017-03
Slide15Care/Maintenance-Ear Muffs
Clean ear cushions and headband regularly with mild soap and waterReplace ear cushions and foam inserts every 4-6 months with normal wear, more often with heavy use/extreme conditionsDo not overstretch headband
15
PPT-017-03
Slide16dBA vs. dBC
The A-weightings and C-weightings refer to different sensitivity scales for noise measurement.“A” scale follows the frequency sensitivity of the human ear at low levels. Is the most commonly used weighting scale, as it also predicts quite well the damage risk of the ear.Sound level meters set to the A-weighting scale will filter out much of the low-frequency noise they measure, similar to the response of the human ear.“C” scale follows the frequency sensitivity of the human ear at very high noise levels. “C” scale is quite flat, and therefore includes much more of the low-frequency range of sounds than the A scales.
16
PPT-017-03
Slide17“Safety Factor” = NRR
Noise Reduction Rating (NRR)OSHA protocolFor “A” scale measurements, NRR minus 7 Example: Noise exposure = 92 dBA Manufacturer’s NRR = 15 15 – 7 = 8 (effective noise exposure reduction) 92 – 8 = 84 dBA (noise exposure at ear)
17
PPT-017-03
Slide18NRR Determination
Per OSHAIf using dB(A) scale: Noise level minus [NRR minus 7 divided by 2] = Noise level at earex. Noise Level = 98 dBA NRR = 25 dBA 98 - [25-7/2=9] = 98-9=89 dBA If using dB(C) scale: Noise level minus [NRR divided by two] = Noise level at ear ex. Noise Level = 98 dB NRR = 25 dB 98 – [25/2=12.5] = 98-12.5=85.5 dB
18
PPT-017-03
Slide19Exposure 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 areas with different noise level readings over 8 hour work shift: ▪ Use 1910.95, Appendix A, Table G-16A ▪ Table A-1
19
PPT-017-03
Slide20Permissible Noise Exposure*
90 dB = 8.0 hours 92 dB = 6.0 hours 95 dB = 4.0 hours 97 dB = 3.0 hours100 dB = 2.0 hours
20
PPT-017-03
102 dB = 1.5 hours105 dB = 1.0 hours
110 dB = 30 minutes115 dB = 15 minutes
*At or above = controls: Engineering, Administrative, PPE
Slide21Exposure Limits
If exposure to 8 hour Time Weighted Average (TWA): → ACGIH 85 dBA (action level) → NIOSH 85 dBA (action level) → OSHA 84 dBA: nothing required 85 – 89 dBA: - Monitoring - Testing - Protection - Training
- Recordkeeping 90 dBA (Permissible Noise Exposure Limit)
21
PPT-017-03
Slide22Noise Monitoring
Required by the OSHA standard to identify all noise at or above 85 dBAMonitoring must be performed:Whenever production is increased Equipment added that could increase noise level
22
PPT-017-03
Slide23Audiograms
23
PPT-017-03
Audiograms are required every year to identify if there has been a loss of hearing
The solid line shows a normal result with no hearing loss. The dotted line represents a typical noise induced hearing loss (NIHL)
Slide24Training Requirements
Annual TrainingHearing Conservation ElementsHearing Protectors Used
24
PPT-017-03
Hearing Conservation Program
Slide25Recordkeeping
Monitoring records (Keep for 2 years) Audiometric testing records (Keep for period of employment)
25
PPT-017-03
Slide26Noise Control
Engineering (e.g. sound barriers)Administrative (e.g. worker rotation)Personal Protective Equipment (PPE) (e.g. ear plugs, ear muffs)
26
PPT-017-03
Slide27What’s Your Company Doing?
To Control Noise Exposure?? → Monitoring? → Engineering? → Administrative? → PPE?If you’re not sure check with your Supervisor and find out!
27
PPT-017-03
Slide28Contact Information
Health & Safety Training Specialists1171 South Cameron Street, Room 324Harrisburg, PA 17104-2501(717) 772-1635RA-LI-BWC-PATHS@pa.gov
28
PPT-017-03
Like us on Facebook!
- https://www.facebook.com/BWCPATHS
Slide29Questions
29
PPT-017-03