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Transcript
HEARING CONSERVATION Hearing Loss Can you imagine not being able to: – Hear music? – Listen to the sounds of nature? – Socialize with your family? Can you imagine being afflicted with uncomfortable ringing or abnormal sounds that interfere with sleep? The Impact Of Noise Interferes with communication Causes fatigue Distracting or irritating Reduces morale or efficiency Anatomy Of The Ear The Outer Ear The Middle Ear The Inner Ear Sounds Several animals can hear sounds of much higher frequency, which is why humans do not hear special whistles that may be heard by dogs. Sounds vary not only in frequency, but also in intensity. Decibel The measure of sound pressure The decibel is a relative measure 5 dBA exchange rate Permissible Noise Exposure 16 8 6 4 85 90 92 95 3 97 2 1.5 100 102 1 105 .5 110 .25 115 Whisper 90 dB 30 Talking 90 dB 60 Traffic 90 dB 80 Haul Truck 85 90 dB Loader 90 dB 86 Lawn Mower 91 90 dB Impact Wrench 103 90 dB Dozer 90 dB 105 Screens 90 dB 109 Chain Saw 110 90 dB Rock Concert 120 90 dB Metal Banging 125 90 dB Jet Airplane 90 dB 140 Threshold of pain 12-Gauge Shotgun 90 dB 165 Hearing Exposure NIOSH estimates that 30 million workers are exposed to hazardous noise levels At present exposure limits, one in four workers will develop permanent hearing loss Hearing Exposure Two Categories of hearing Loss: Temporary Permanent Hearing Loss Causes Wax build up Measles / Otosclerosis Aging Head injury Drugs / Medicine Chemicals Heredity Signs of Hearing Loss Fail to catch words Ears ringing Shouting without realizing Trouble understanding high frequency sounds in speech Demonstration of Hearing Loss Sound tracks of a male voice, with no background noise – Normal – Loss of 25 dB – Loss of 40 dB – Loss of 60 dB – Normal Noise Standard Action Level 85 dB - Must inform employees & enroll them in a hearing conservation program Permissible Exposure Level 90 dB Must enroll employee in a hearing conservation program, use all controls to reduce exposure, must wear hearing protection Dual Protection Level wear both plugs and earmuffs 105 dB - Must Eliminating Noise Engineering Controls – Eliminate or reduce the noise at the source – Interrupting the noise path – Reducing reverberation Administrative Controls – Change in work schedule – Quiet areas for breaks – Job rotation Hearing Conservation Program Monitoring system Hearing protection Audiometric testing Training Recordkeeping Audiograms Audiometric testing offered Qualified medical provider Baseline tests Annual testing Standard Threshold Shift Hearing changed by 10 db average Employee notification within 21 days Revised hearing protection required Further medical evaluation Monitoring Dosimeter Sound Level Meter Noise Reduction Rating (NRR) Listed on the package How many decibels are blocked OSHA subtracts the NRR by 50% NIOSH subtracts the NRR by 25% for earmuffs, 50% for formable plugs, and 70% for all other plugs Hearing Protection Reusable and Headband Plugs – – – – – 25 to 35 dB NRR Preformed to fit ear Flexible rubber Inspect and clean Replace when hard or damaged Hearing Protection Disposable Plugs – – – – 25 to 35 dB NRR Expandable foam One size fits all Insert with clean hands – If damaged or dirty throw them away Inserting Plugs Hearing Protection Earmuffs – 22 to 29 dB NRR – Foam filled cushions – Hard to get good seal – Works well with plugs – Replace when stiff or worn Plugs vs. Earmuffs Advantages Ear Plugs Good NRR. Ear Muffs Disadvantages Hard to wear. Get dirty. Easy to wear. Fair NRR. Fits everyone. Expensive. Easily broken. Conclusion Prolonged noise exposure causes permanent hearing loss Hearing loss is preventable, so wear your hearing protection! It’s Really Pretty Simple….. Wear this now... Or wear this later!