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FRACTIONAL PENETRATION OF PAINT OVERSPRAY ARRESTORS
Citation:
Darvin*, C H. FRACTIONAL PENETRATION OF PAINT OVERSPRAY ARRESTORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-97/011 (NTIS PB97-147953), 1997.
Impact/Purpose:
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Description:
The report describes the development of fractional penetration curves for liquid droplet penetration of overspray arrestors for discrete droplet diameters from 0.3 to 10 micrometers. (NOTE: Fine particulates are particles with diameters of 10 micrometers or less.) These data points were obtained for two conditions: (1) for a clean arrestor, and (2) for an arrestor coated with paint. The paint was applied to the arrestor by spraying high solids baking enamel from a spray gun directed at the paint overspray arrestor with the air flowing at a face velocity of 120 fpm (0.61 m/sec). Paint overspray arrestors tested can be grouped into three generic designs. This work demonstrated that, for the conditions of the tests, the behavior of the paint overspray arrestor is peculiar to the design of the arrestor. The program also defined the efficiency of the test method used to define the fractional penetration. The results indicate that, with the five different arrestor systems tested, the 50% cutoff diameter ranged from 3 to 7 micrometers. The two-stage polyester bag system showed the smallest cutoff diameter at about 3 micrometers. The inertial separator system designs exibited the greatest cutoff level at about 7 micrometers.