Noise Exposure and the OSHA Standard

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Presentation transcript:

Noise Exposure and the OSHA Standard Presented By: Stephen Jurss, CIH, CSP Civil Engineering Bldg. Rm. B173 TX: 494-9227, sejurss@purdue.edu

Introduction Definition of Noise? Unwanted sound.

The Physics of Sound

The Physics of Sound

The Physics of Sound

Anatomy of the Human Ear

Anatomy of the Human Ear

Noise Convection and Conduction

Physiology of the Cochlea

Cochlea Cilia

Operation of the Cochlea

Healthy Cochlea The cilia ( sensory hairs) appear normal

Damaged Cochlea Loss of cilia as a result of Noise

Sound Levels

OSHA Noise Standard 2 Program Strategy – TWA- Time Weighted Average Noise Exposure Program – 90 dBA 8 hour TWA(Equivalent Exposure Concept) Hearing Conservation Program – 85 dBA 8 hour TWA TWA- Time Weighted Average

OSHA Regulation – Exposure Level vs Duration

Noise Measuring Equipment Sound Level Meters (SLM) Continuous on-mobile sources Noise Dosimeters Mobile/variable noise sources

Noise Control Measures Engineering Controls – Enclosure, Sound Dampening and Absorption Administrative Controls Use of Hearing Protection Devices - Noise Reduction Rating (NRR)

Hearing Protection Devices and Their Noise Reduction Ratings EAR Foam Plugs (NRR = 29 dB) EAR CARBOFLEX (NRR= 20 dB) Moldex PURAFIT Foam Plugs (NRR=30 dB)

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