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Mining Publication: A New Leak Test Method for Enclosed Cab Filtration Systems
Keywords: Cabs CO2 meters Filtration systems Ventilation
Original creation date: May 2012
Authors: JA Organiscak, M Schmitz
Report of Investigations - May 2012
Download PDF Document (1.55 MB)
NIOSHTIC2 Number: 20040851
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2012-145, RI 9690, May; :1-41
A new test method has been developed by the National Institute for Occupational Safety and Health (NIOSH) and Clean Air Filter (CAF) for quantifying the outside air leakage into environmental cab filtration systems. This method uses specially configured filter cartridges to remove carbon dioxide (CO2) from the environmental cab’s air filtration system. Real-time gas monitors are used to measure the outside and inside cab CO2 concentrations after the cab reaches steady-state equilibrium conditions inside an unoccupied cab. Cab filtration system leakage can be mathematically determined using the measured cab penetration (inside to outside cab concentration ratio) and the special CO2 filter cartridge efficiency. Examination of several CO2 sampling instruments for this type of testing showed them to be relatively precise, but exhibited noticeable variations in accuracy. These results indicate that frequent gas calibration checks of comparative sampling instruments would be needed to ensure their accuracy, which is not well-suited for cab field testing. Thus, a single-instrument, multiple-sample-location cab testing methodology was devised to eliminate multiple-instrument sampling biases and frequent calibrations during testing. This methodology was examined and can provide accurate measurements of filtration system leakage into enclosed cabs with a precise instrument at or near steady-state test conditions. The new leak test method provides cab manufacturers, cab service personnel, and industrial hygienists with a measurement tool to ensure environmental cab integrity and minimize worker exposure to outside airborne substances.
Image of publication A New Leak Test Method for Enclosed Cab Filtration SystemsReport of Investigations - May 2012
Download PDF Document (1.55 MB)
NIOSHTIC2 Number: 20040851
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2012-145, RI 9690, May; :1-41
See Also
Clearing the Air
Current NIOSH Dust Control Research for Noncoal Surface Mines
Doing the Math: The Effectiveness of Enclosed-Cab Air-Cleaning Methods Can Be Spelled Out in Mathematical Equations
Key Design Factors of Enclosed Cab Dust Filtration Systems
Laboratory Investigation of Enclosed Cab Filtration System Performance Factors
Maximizing Air Quality Inside Enclosed Cabs with a Unidirectional Filtration and Pressurization System
A New Concept for Leak Testing Environmental Enclosure Filtration Systems
Reducing Dust Inside Enclosed Cabs
Respirable Dust
Technology News 550 - A Test Method for Quantifying Unfiltered Air Leakage into Enclosed Cabs
Workplace Solutions: Reducing Hazardous Dust in Enclosed Operator Cabs During Construction
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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