An Evaluation of Industrial Ventilation Branch Screening Methods for Obstructions in Working Exhaust Systems

Details

• Personal Author:
  Booth DW Sr. ; Guffey SE
• Description:
  This research evaluated the effectiveness of screening methods in identifying obstructed branches in industrial ventilation systems. These methods were divided into two categories: pressure comparisons and pressure ratio comparisons. The first category contained techniques that compare measured static pressures with the corresponding design static pressures or with previously measured pressures. Certain aspects of the method suggested in the Industrial Ventilation Manual were also tested. The second category compares the ratios of two measured pressures and includes the new reference ratio method. Data were collected from six industrial ventilation systems. Four of the systems were used to control wood dust, and two were used to control metal shavings from a saw-sharpening operation. Each system was tested for naturally occurring or deliberately inserted obstructions. Appropriate static and velocity pressures were measured to calculate each troubleshooting method's parameter. The change in the parameter was compared with a range of thresholds for the test cases. Receiver operator characteristic curves and bootstrapping techniques were used to identify the best method for determining the presence of obstructions or alterations. The pressure ratio methods were found to be substantially superior to the pressure comparison methods at detecting obstructions. [Description provided by NIOSH]
• Subjects:
  Air Movements Air Pollutants, Occupational Air Pollution, Indoor Dust Metals Occupational Health Particulate Matter Safety Ventilation Wood
• Keywords:
  Air-contamination Air-flow Airborne-particles Author Keywords: Monitoring Dust-analysis Dust-collection Dust-control-equipment Dust-exposure Dust-inhalation Dust-particles Dust-sampling Dusts Exhaust-systems Exhaust-ventilation Industrial-ventilation Metal-dusts Obstructions Pressure Measurement Troubleshooting Ventilation-systems Wood-dusts

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• ISSN:
  0002-8894
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  California ; OSHA Region 10 ; OSHA Region 9 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  401-410
• Volume:
  62
• Issue:
  4
• NIOSHTIC Number:
  nn:20029656
• Citation:
  Am Ind Hyg Assoc J 2001 Jul/Aug; 62(4):401-410
• Contact Point Address:
  Derrick W. Booth, Mathematics, Engineering, and Science Achievement Program, Butte College, Oroville, CA 95965
• Federal Fiscal Year:
  2001
• NORA Priority Area:
  Research Tools and Approaches: Intervention Effectiveness Research
• Performing Organization:
  University of Washington, Department of Environmental Health, Seattle, WA
• Peer Reviewed:
  True
• Start Date:
  19940401
• Source Full Name:
  American Industrial Hygiene Association Journal
• End Date:
  19971030
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:21084cdf343441a69fd6140035a4feab5bf648168005aeb737b35977da6c70d7ee151d11136aeedcf587a1e1f93d1dfed0fb2496bbbe7e939b2cc3a43b2381f4
• Download URL:
  https://stacks.cdc.gov/view/cdc/190588/cdc_190588_DS1.pdf
• File Type:
  [PDF - 332.89 KB ]