HEARING CONSERVATION PROGRAM. COMDTINST M5100.47 Chapter 4. PURPOSE. PREVENT HEARING LOSS REDUCE HEALTH & ECONOMIC IMPACT. Program Elements. Identify, assess, and post hazardous noise source. Determine extent of personal exposed Engineer method to abate
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unit of sound measurement
mimics human ear’s response to sound
change in hearing level between baseline audiogram & current tests
Noise maybe defined as any pressure variation that the human ear can detect...
(in air, water, or other mediums)
(permanent or temporary)
Hearing protective devices shall be worn by all personnel when they enter or work in an area where the operation generates noise levels above:
single > 84 dBA continues sound level or 140 impact.
double > 104 dBA
Sound surveys can be either dosimetery or direct reading.
Dosimetery reads SPL over work period to get TWA.
Direct read meter gives a snap shot level of a certain equipment or area in operation.
You probably need hearing protection if you have to raise your voice to someone 2 feet away in order for them to hear you.
one in which the sound level exceeds 84 dBA TWA for 30 or more days per calendar year
Hearing protection comes with a Noise Reduction Rate (NRR). This tells you the protection factor for the device according to the manufacturer.
NRR = 29 105 dBA
subtract - 7 - 22
22 83 dBA