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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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hearing conservation program

HEARING CONSERVATION PROGRAM

COMDTINST M5100.47

Chapter 4

purpose
PURPOSE
  • PREVENT HEARING LOSS
  • REDUCE HEALTH & ECONOMIC IMPACT
program elements
Program Elements
  • Identify, assess, and post hazardous noise source.
  • Determine extent of personal exposed
  • Engineer method to abate
  • Provide and require the use of PPEs.
  • Educate and advise personnel concerning hearing conservation min.. of one hour...annual refresher.
  • Medical monitoring of exposed employees.
definitions
DEFINITIONS
  • decibel (dB)

unit of sound measurement

  • A-weighted scale

mimics human ear’s response to sound

  • threshold shift

change in hearing level between baseline audiogram & current tests

what is noise
What is noise?

Noise maybe defined as any pressure variation that the human ear can detect...

(in air, water, or other mediums)

types of hearing loss
Types of hearing loss
  • Conductive
  • Sensorineural
  • Mixed

(permanent or temporary)

coast guard standards
Coast Guard Standards

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 level survey

Sound Level Survey

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.

rule of thumb

RULE OF THUMB:

You probably need hearing protection if you have to raise your voice to someone 2 feet away in order for them to hear you.

noise controls
Noise Controls
  • Administrative
    • time exposure, require ppe, monitor conditions
  • Personal Protective Equipment (PPE)
    • ear plug and or muffs
  • Engineering
    • barriers, mounts, mufflers
ommp hcp enrollment
OMMP HCP Enrollment
  • Personnel assigned to hazardous noise environment:

one in which the sound level exceeds 84 dBA TWA for 30 or more days per calendar year

  • Hearing has deteriorated (hearing shift of 10 or > )
slide17
NRR?

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