Document Detail


Performance of industrial mist collectors over time.
MedLine Citation:
PMID:  11141605     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Effective, economical control of metalworking fluid mists at the source is important, because exposure to these mists may cause adverse health effects. This study investigated performance changes over time for industrial collectors that removed metalworking fluid mist in the laboratory and in a transmission plant. Aerosizers were used to measure the efficiency of each stage in several multistage collectors as a function of mist droplet diameter, for up to one year of continuous operation. Metal-mesh, first-stage filters operated at low pressure drops and were effective at removing droplets larger than 3 to 5 microns in diameter. Some second-stage filters worked better than others. Both "65 percent" and "95 percent" cartridge filters failed after only a few weeks; their efficiencies decreased substantially over that time. Pocket filters and cylindrical cartridges used as second-stage filters also decreased in efficiency for submicron droplets. Whereas filters for solid particles load continuously to form a dust cake that increases efficiency, mist filters form no cake and load only to the point where collection equals drainage. As a mist filter loads, the interstitial gas velocity increases, so that efficiency decreases for small droplets that collect by diffusion. Although a third-stage 95 percent DOP filter showed important decreases in efficiency over time for submicron droplets, third-stage HEPA filters operated with efficiencies that consistently approaches 100 percent for droplets of all sizes, even after one year of operation. These results suggest that the performance of second-stage filters can be improved if they can be made to drain collected liquid more effectively. For high efficiency, mist collectors should use a HEPA filter as a final stage.
Authors:
M Boundy; D Leith; D Hands; M Gressel; G E Burroughs
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied occupational and environmental hygiene     Volume:  15     ISSN:  1047-322X     ISO Abbreviation:  Appl Occup Environ Hyg     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2001-01-04     Completed Date:  2001-01-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9103256     Medline TA:  Appl Occup Environ Hyg     Country:  England    
Other Details:
Languages:  eng     Pagination:  928-35     Citation Subset:  IM    
Affiliation:
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, USA.
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MeSH Terms
Descriptor/Qualifier:
Aerosols
Air Pollution, Indoor / prevention & control*
Environmental Monitoring / methods*
Equipment Failure
Filtration
Humans
Industry
Inhalation Exposure
Metallurgy
Occupational Exposure*
Chemical
Reg. No./Substance:
0/Aerosols

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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