Measuring and testing – With fluid pressure – Leakage
Patent
1982-07-14
1985-01-22
Kreitman, Stephen A.
Measuring and testing
With fluid pressure
Leakage
7386358, G01M 320
Patent
active
044944039
ABSTRACT:
A filter testing apparatus and method are provided wherein a challenge aerosol or the like is introduced upstream of the filter, and the downstream face of the filter is scanned with an air sampling probe to detect for the presence of leaking aerosol. The apparatus comprises a generally rectangular frame, and an air sampling probe which is mounted to the frame so as to be movable in a predetermined pattern wherein the entire face of an adjacent filter is scanned. The assembly may be removably mounted in a filter housing immediately downstream of the filter, or mounted on a framework downstream of a bank of several filters. In the latter instance, the assembly is sequentially indexed to a position alignment with each filter, and an upstream aerosol dispersion assembly is also provided which is correspondingly indexed across the filter bank. The rate of leaking challenge aerosol is continuously plotted on a moving sheet of paper to thereby permit the magnitude of a leak and its location on the face of the filter to be readily determined.
REFERENCES:
patent: 3395514 (1968-08-01), Bub
patent: 3522724 (1970-08-01), Knab
patent: 3765225 (1973-10-01), Rivers
patent: 3885437 (1975-05-01), Reagan
patent: 4055075 (1977-10-01), Allan et al.
patent: 4324568 (1982-04-01), Wilcox et al.
Hepa Filters and Filter Testing, 2nd Edition, 17 pp., Published by Flanders Filters, Inc., 1981.
Nuclear Air Cleaning Handbook, Burchstead et al., Printed by Oak Ridge National Lab, pp. 187-208, 1976.
Allan Thomas T.
Bowers Cecil W.
Thompson Ivey G.
Flanders Filters, Inc.
Kreitman Stephen A.
Roskos Joseph W.
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