High velocity, low volume dust capture during grinding using portable tools.
Proceedings of the symposium on occupational health hazard control technology in the foundry and secondary non-ferrous smelting industries, December 10-12, 1979, Chicago, Illinois. Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 81-114, 1981 Aug; :72-81
Two functioning high velocity, low volume dust capture systems which were shown to be effective in the control of dust generated during grinding and casting operations conducted with portable tools were described. System design was based on observations made of the cleaning room process. The first system consisted of a cupstone grinder exhaust hood capable of drawing 200 cubic feet of air per minute (cfm) with a small hood loss, a chipping hammer hood for drawing 130cfm, and a cone grinder hood drawing 150cfm, all provided with short exhaust hoses. The cone grinder and chipping hammer hoods required modification to permit full use. This was done using magnets to fix the hoods in positions where they would not be an obstruction to the work process but would still suction the dust. The installation of the system resulted in reduction of silica (14808607) dust in the cleaning room to levels compatible with the requirements of the Occupational Safety and Health Administration. The second system, which was installed at another foundry cleaning room operation, was based on the use of several hand grinding tools provided with high velocity, low volume exhaust hoods designed for 2,200cfm each. The system, which was designed to accommodate 12 inlets, required the use of 25 foot hoses. The author concludes that the use of high velocity, low volume exhaust systems for dust control increases productivity and allows the workers an unobstructed view to their work, without having to wear dust respirators.
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