Retrofit noise controls for crushing and screening plants.
Noise Control: Proceedings: Bureau of Mines Technology Transfer Seminars, Pittsburgh, PA, July 24, 1984, and Denver, CO, July 26, 1984. Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 8986, 1984 Jul; :107-119
Crushing and screening equipment in the sand and gravel and crushed stone industries generate excessive noise. Plant operators and cleanup personnel receive a full-shift exposure that ranges from three to four times the exposure allowed by Federal regulations. Noise is typically generated by the impact of the product against the steel components of the plant. The impact forces cause the components to resonate and create airborne noise. During a Bureau of Mines sponsored research program, retrofit noise control treatments were successfully installed and evaluated in a primary crushing plant and two secondary crushing and screening plants. A control booth was installed at the primary crushing plant; the noise levels at the operator's location were reduced from 97 to 78 dBA. Noise levels measured at normal cleanup locations were reduced by 4 to 7 dBA (97.5-98 to 91-93.5 dBA) at one of the two secondary plants. This paper describes how to des:lgn, select, and install similar retrofit noise control treatments for crushing and screening plants.
Coal processing; Mineral processing; Noise; Noise control; Engineering controls; Control technology
IH; Conference/Symposia Proceedings
Noise Control: Proceedings: Bureau of Mines Technology Transfer Seminars, Pittsburgh, PA, July 24, 1984, and Denver, CO, July 26, 1984