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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.
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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.
Healthy Cochlea The cilia ( sensory hairs) appear normal
Damaged Cochlea Loss of cilia as a result of Noise
OSHA Noise Standard • 2 Program Strategy – Noise Exposure Program – 90 dBA 8 hour TWA(Equivalent Exposure Concept) Hearing Conservation Program – 85 dBA 8 hour TWA TWA- Time Weighted Average
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)