Multiple HEPA filter test methods :
January--December 1976 /
by Burton Schuster, Thomas Kyle, Dan Osetek, Industrial Hygiene Group, Health Division, Los Alamos Scientific Laboratory.
Description
- Language(s)
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English
- Published
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Los Alamos, New Mexico : Los Alamos National Laboratory, 1977.
- Summary
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The testing of tandem high-efficiency particulate air (HEPA) filter systems is of prime importance for the measurement of accurate overall system protection factors. A procedure, based on the use of an intra-cavity laser particle spectrometer, has been developed for measuring protection factors in the 10⁸ range. A laboratory scale model of a filter system was constructed and initially tested to determine individual HEPA filter characteristics with regard to size and state (liquid or solid) of several test aerosols. Based on these laboratory measurements, in-situ testing has been successfully conducted on a number of single and tandem filter installations within the Los Alamos Scientific Laboratory as well as on extraordinary large single systems at Rocky Flats. For the purpose of recovery and for simplified solid waste disposal, or prefiltering purposes, two versions of an inhomogeneous electric field air cleaner have been devised and are undergoing testing. Initial experience with one of the systems, which relies on an electrostatic spraying phenomenon, indicates performance efficiency of greater than 99.9% for flow velocities commonly used in air cleaning systems. Among the effluents associated with nuclear fuel reprocessing is ¹²⁹I. An intra-cavity laser detection system is under development which shows promise of being able to detect mixing ratios of one part in 10⁷, I₂ in air.
- Note
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"United States Energy Research and Development Administration Contract W-7405-Eng. 36"--Cover.
"UC-41; Issued: June 1977"--Cover.
"LA-6852-PR; Progress Report"--Cover.
- Physical Description
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20 pages :
illustrations ;
28 cm.
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