Experimental Evaluation of a Mathematical Model for Predicting Transfer Efficiency of a High Volume – Low Pressure Air Spray Gun

Details

• Personal Author:
  Flynn MR ; Tan YM
• Description:
  The transfer efficiency of a spray-painting gun is defined as the amount of coating applied to the workpiece divided by the amount sprayed. Characterizing this transfer process allows for accurate estimation of the overspray generation rate, which is important for determining a spray painter's exposure to airborne contaminants. This study presents an experimental evaluation of a mathematical model for predicting the transfer efficiency of a high volume-low pressure spray gun. The effects of gun-to-surface distance and nozzle pressure on the agreement between the transfer efficiency measurement and prediction were examined. Wind tunnel studies and non-volatile vacuum pump oil in place of commercial paint were used to determine transfer efficiency at nine gun-to-surface distances and four nozzle pressure levels. The mathematical model successfully predicts transfer efficiency within the uncertainty limits. The least squares regression between measured and predicted transfer efficiency has a slope of 0.83 and an intercept of 0.12 (R2 = 0.98). Two correction factors were determined to improve the mathematical model. At higher nozzle pressure settings, 6.5 psig and 5.5 psig, the correction factor is a function of both gun-to-surface distance and nozzle pressure level. At lower nozzle pressures, 4 psig and 2.75 psig, gun-to-surface distance slightly influences the correction factor, while nozzle pressure has no discernible effect. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Dust Occupational Exposure Occupational Health Paint Safety
• Keywords:
  Aerosol Particles Airborne Dusts Airborne Particles Air Contamination Author Keywords: Spray Painting High Volume-Low Pressure Air Spray Gun Mathematical Models Models Occupational Exposure Spray Painting Transfer Efficiency

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• ISSN:
  1047-322X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  North Carolina ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  15
• Issue:
  10
• NIOSHTIC Number:
  nn:20024441
• Citation:
  Appl Occup Environ Hyg 2000 Oct; 15(10):785-793
• Federal Fiscal Year:
  2001
• NORA Priority Area:
  Research Tools and Approaches: Exposure Assessment Methods
• Performing Organization:
  Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
• Peer Reviewed:
  True
• Start Date:
  19950930
• Source Full Name:
  Applied Occupational and Environmental Hygiene
• End Date:
  19990929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2ad013b17d6cfd5dc5301efbccc0524975d1695593de298df1212eab6d48183adeb4d58930562562a5a1c34caf692bd4947d3ba08b5da4aef18b376ee9b1161f
• Download URL:
  https://stacks.cdc.gov/view/cdc/196245/cdc_196245_DS1.pdf
• File Type:
  [PDF - 364.21 KB ]