Performance of Industrial Mist Collectors over Time

Details

• Personal Author:
  Boundy M ; Burroughs, G. Edward ; Gressel, Michael G. ; Hands D ; Leith D
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Air Pollution Metals Metal Workers Occupational Health Safety
• Keywords:
  Aerosol Particles Air Contamination Air Quality Measurement Air Quality Monitoring Author Keywords: Mist Collectors Filter Materials Metalworking Metalworking Fluids Metalworking Industry Oil Mist Oil Mists Safety Measures

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• ISSN:
  1047-322X
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Illinois ; Michigan ; North Carolina ; Ohio ; OSHA Region 4 ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  15
• Issue:
  12
• NIOSHTIC Number:
  nn:20020618
• Citation:
  Appl Occup Environ Hyg 2000 Dec; 15(12):928-935
• Federal Fiscal Year:
  2001
• Peer Reviewed:
  True
• Source Full Name:
  Applied Occupational and Environmental Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f0726694c3a6af9b4a845ed3ed5fd02a32cf2aec0c2d1c1679b330ca5c3ba64dcc9e8091e9a07f34587b6506eaa881920656a8101c9f8a927fde29355918e7eb
• Download URL:
  https://stacks.cdc.gov/view/cdc/198315/cdc_198315_DS1.pdf
• File Type:
  [PDF - 368.48 KB ]