Accession Number : ADA294493

Title :   Demonstration of Split-Flow Ventilation and Recirculation as Flow-Reduction Methods in an Air Force Paint Spray Booth.

Descriptive Note : Final rept. 15 Feb 91-9 Oct 92,

Corporate Author : ACUREX ENVIRONMENTAL CORP MOUNTAIN VIEW CA

Personal Author(s) : Hughes, S. ; Ayer, J. ; Sutay, R.

PDF Url : ADA294493

Report Date : 27 JUL 1994

Pagination or Media Count : 130

Abstract : During a series of painting operations in a horizontal-flow paint spray booth at Travis AFB, CA, baseline concentrations of four classes of toxic airborne pollutants were measured at 24 locations across a plane immediately forward of the exhaust filters, in the exhaust duct, and inside and outside the respirator in the painter's breathing zone (BZ). The resulting data were analyzed and used to design a modified ventilation system that (1) separates a portion of the exhaust exiting the lower portion of the booth, which contains a concentration of toxic pollutants greater than the average at the exhaust plane (split-flow); and (2) provides an option to return the flow from the upper portion of the exhaust to the intake plenum for mixing with fresh air and recirculation through the booth (recirculation). After critical review by cognizant Air Force offices, and an experimental demonstration showing that a flame ionization detector monitoring the air entering the booth is able to detect excursions above the equivalent exposure limit for the solvents in the paint, the exhaust duct was reconfigured for split-flow and recirculating ventilation. A volunteer painter was briefed on the increased risk of exposure during recirculation, and on the purposes and possible benefits of this study. He then signed an informed consent form before participating in the recirculation tests. A series of tests generally equivalent to the baseline series was conducted during split-flow and recirculating ventilation, and three tests were performed during only split-flow ventilation.

Descriptors :   *AIR POLLUTION, *VENTILATION, *HAZARDOUS WASTES, *EMISSION CONTROL, TEST AND EVALUATION, AIR FORCE, DETECTORS, RISK, EXPOSURE(GENERAL), MONITORING, AIR, TOXICITY, AIRBORNE, VOLUNTEERS, BASE LINES, LIMITATIONS, DUCTS, CONCENTRATION(COMPOSITION), IONIZATION, SOLVENTS, POLLUTANTS, FILTERS, FLAMES, RECIRCULATION, EXHAUST SYSTEMS, BZ AGENTS.

Subject Categories : Air Pollution and Control
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE