skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: In-place testing of tandem HEPA filter stages using fluorescent aerosols

Abstract

Fluorescent test aerosols have been incorporated into an in-place two-stage high-efficiency particulate air (HEPA) filter test method to improve sensitivity and eliminate interference by background aerosol leaking into the downstream sampling location. The method has been demonstrated by field testing large two-stage HEPA systems, one with a flow rate of 22 m/sup 3//s (48,500 cfm) and a decontamination factor (DF) of approximately 10/sup 8/. Advantages of the method, such as DF measurement more representative of actual filter performance and potential savings in construction and testing costs, make the fluorescent particle method a useful test method. A laser fluorescent particle spectrometer suitable for testing by this method was developed in conjunction with an instrument manufacturer and is commercially available. An improved dilution system was developed to reduce upstream aerosol concentration into the operating range of the spectrometer. Generation of a fluorescent dye-tagged DOP aerosol was accomplished by high-capacity, gas-thermal generator. Aerosol concentration of approximately 2 x 10/sup 6/ particles per cm/sup 3/ was maintained in the plenum upstream of the first stage. Other in-place test methods using fluorescent particles collected on sampling filters were investigated with only limited success and could not be extended to two-stage testing. The potentially most sensitivemore » method, counting of solid fluorescent particles on sample filters taken upstream and downstream of HEPA filter stages, was restricted by particle losses in the resuspension operation. Maximum DF measurable by a solid fluorescent particle method was predicted to be 3 x 10/sup 3/, which would be adequate for testing one high-quality HEPA filter stage without excessive filter loading.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA)
OSTI Identifier:
6504929
Report Number(s):
LA-8805-MS
ON: DE81024008
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR FILTERS; PERFORMANCE TESTING; AEROSOLS; FLUORESCENCE; COLLOIDS; DISPERSIONS; EQUIPMENT; FILTERS; LUMINESCENCE; POLLUTION CONTROL EQUIPMENT; SOLS; TESTING; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Elder, J C, Kyle, T G, Tillery, M I, and Ettinger, H J. In-place testing of tandem HEPA filter stages using fluorescent aerosols. United States: N. p., 1981. Web.
Elder, J C, Kyle, T G, Tillery, M I, & Ettinger, H J. In-place testing of tandem HEPA filter stages using fluorescent aerosols. United States.
Elder, J C, Kyle, T G, Tillery, M I, and Ettinger, H J. 1981. "In-place testing of tandem HEPA filter stages using fluorescent aerosols". United States.
@article{osti_6504929,
title = {In-place testing of tandem HEPA filter stages using fluorescent aerosols},
author = {Elder, J C and Kyle, T G and Tillery, M I and Ettinger, H J},
abstractNote = {Fluorescent test aerosols have been incorporated into an in-place two-stage high-efficiency particulate air (HEPA) filter test method to improve sensitivity and eliminate interference by background aerosol leaking into the downstream sampling location. The method has been demonstrated by field testing large two-stage HEPA systems, one with a flow rate of 22 m/sup 3//s (48,500 cfm) and a decontamination factor (DF) of approximately 10/sup 8/. Advantages of the method, such as DF measurement more representative of actual filter performance and potential savings in construction and testing costs, make the fluorescent particle method a useful test method. A laser fluorescent particle spectrometer suitable for testing by this method was developed in conjunction with an instrument manufacturer and is commercially available. An improved dilution system was developed to reduce upstream aerosol concentration into the operating range of the spectrometer. Generation of a fluorescent dye-tagged DOP aerosol was accomplished by high-capacity, gas-thermal generator. Aerosol concentration of approximately 2 x 10/sup 6/ particles per cm/sup 3/ was maintained in the plenum upstream of the first stage. Other in-place test methods using fluorescent particles collected on sampling filters were investigated with only limited success and could not be extended to two-stage testing. The potentially most sensitive method, counting of solid fluorescent particles on sample filters taken upstream and downstream of HEPA filter stages, was restricted by particle losses in the resuspension operation. Maximum DF measurable by a solid fluorescent particle method was predicted to be 3 x 10/sup 3/, which would be adequate for testing one high-quality HEPA filter stage without excessive filter loading.},
doi = {},
url = {https://www.osti.gov/biblio/6504929}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {4}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: