noise exposure and the osha standard
DESCRIPTION
Noise Exposure and the OSHA Standard. Presented By: Stephen Jurss, CIH, CSP Civil Engineering Bldg. Rm. B173 TX: 494-9227, [email protected]. Introduction. Definition of Noise?. Unwanted sound. The Physics of Sound. The Physics of Sound. The Physics of Sound. Anatomy of the Human Ear. - PowerPoint PPT PresentationTRANSCRIPT
Noise Exposure and the OSHA Standard
Presented By: Stephen Jurss, CIH, CSPCivil Engineering Bldg. Rm. B173TX: 494-9227, [email protected]
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 –
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
140
120
100
80
Decibel 60
- Noise Control Program 40 - Hearing Conservation 20
0 2 4 6 8 Exposure Duration (Hours)
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)