Noise - 2 entradas encontradas
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Portable air compressors - Noise emission standards.
Introduction (background information on the new regulations, comments received from industry, health and welfare and environmental agencies, etc.), followed by the text of the regulations, which specify A-weighted sound pressure level, measured at a distance of 7m from the surface of the portable air compressor enclosure, using slow meter response. As from 1 Jan. 1978, portable air compressors with maximum rated capacity not exceeding 250 cubic feet per minute shall not produce an average sound level in excess of 76dBA; as from 1 July 1978 this sound level also applies to portable air compressors with maximum rated capacity greater than 250 cubic feet per minute. Subsequent sections are devoted to: maintenance of records and submittal of information; test procedures; compliance with standards; required data; labelling; reporting of test results, etc.
Federal Register, Code of Federal Regulations, Title 40, Chapter 1, Part 204: Noise emission standards for construction equipment. Washington D.C., USA, 14 Jan. 1976, Vol.41, No.9, p.2162-2182.
Amendment to 30 CFR Parts 55 - Health and safety standards: metal and nonmetallic open pit mines; 56 - Health and safety standards: sand, gravel and crushed stone operations; and 57 - Health and safety standards: metal and nonmetallic underground mines.
These amendments, dated 2 Aug. 1974, became effective on 7 Aug. 1974. The standards are revised to prescribe that no employee shall be permitted an exposure to noise in excess of 90dBA for 8h a day, 92dBA:6h, 95dBA:4h, 97dBA:3h, 100dBA:2h, 102dBA:1h30min, 105dBA:1h, 110dBA:30min, 115dBA:15min or less. No exposure to exceed 115dBA. Impact or impulsive noise not to exceed 140dBA peak sound pressure level. When the daily noise exposure is composed of two or more periods of noise exposure at different levels, their combined effect shall be considered rather than the individual effect of each.
Federal Register, Code of Federal Regulations, Title 30, Chapter 1. Bureau of Mines, Department of the Interior, Washington, D.C. Washington, D.C., USA, 7 Aug. 1974, Vol.39, no.153, p.28433-28434.