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The Noise Reduction Rating (NRR) needed for each piece of equipment is given. For equipment not listed, please contact EH&S at 392-1591 for an evaluation. Noise Source Sound Level NRR Needed Time Allowed Airboat 108 dBA 30 2 minutes Band Saw 104 dBA 26 6 minutes Blender 91 dBA 13 2 hours Blower 99 dBA 21 19 minutes Concrete Saw 112 dBA 34 1 minute
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Noise assessment of stone/aggregate mines: six case studies Tntrodustion LR. '&AUER AN!1.1. BAII~H number of ways, including condnct- Exposure tq noise and noisefa- ing a cross-sectional survey of noise dnced hearing loss (NEL) contin- sources and worker noise exposures URS to be problematic for the U.S. in the mining industry.Initially, these ...
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Feb 25, 2008· Huge slabs of concrete with rebar is crushed with a Hazemag 1315 APPH Horizontal Shaft Impactor w/ 300 HP Motor. The metal is extracted by a …
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Decibel Level Of A Stone Crusher. granite grinding noise decibles – Crusher South Africa ... Mini Concrete Crusher for sale,Mini Concrete Crushing machine. Shifts the noise below 75 decibels (db level), dust pollution. 6. … After secondary crushing, the stone enter into the vsi crusher for shapping. ...
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Concrete workers (pumps, vibrators, jackhammers) Drywallers shooting tracks or boarding OSHA Inspection Data ... Noise Reduction Rating. A hearing protector's ability to reduce noise is its Noise Reduction Rating (NRR). The greater the NRR, the better the noise attenuation. ...
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bar from broken concrete slabs. The saw operator was exposed to noise from the cutting operation and the exhaust of the engine. The road grader had a cab, but no insulation on the walls or a floor pad, and the doors were left open during operation. The road saws had 26" toothed circular blades that were used to cut a concrete road into
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