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Accuracy of the 10-mm cyclone for sampling respirable coal mine dust.
Bartley-DL; Bowman-JD; Breuer-GM; Doemeny-LJ
Aerosols in the mining and industrial work environments, Vol. 3, instrumentation. Marple VA, Liu-BYH, eds. Ann Arbor, MI: Ann Arbor Science, 1983 Jan; 3:897-906
The accuracy of a 10 millimeter (mm) cyclone for sampling respirable coal mine dust was evaluated. An empirical mathematical model was developed to assess cyclone performance in terms of the parameters, flow rate-Q and calibration constant-k. Q-value and k-value were selected to give the best estimates of respirable dust concentrations as defined by the British Medical Research Council (MRC) criterion. This was done by introducing a function to create a non weighted least squares fit of a cyclone transmitted representative mass distribution to the corresponding MRC respirable mass distribution. Input consisted of monodisperse cyclone collection efficiency data. This resulted in a computed Q-value of 1.2 liters per minute as the flow rate that would maximize performance. A cyclone penetration experiment was conducted with Mine Safety Administration sampling units using a fluorescein tagged aerosol at the suggested flow rate Q-value of 1.2 liters per minute. Using the resulting experimental curve, the optimum k-value was computed to be 0.91. The authors conclude that the optimizing parameters for the 10mm cyclone are Q-value 1.2 liters per minute and k-value 0.91.
Coal-dust; Miners; Breathing-zone; Pulmonary-clearance; Lung-irritants; Respiration; Pulmonary-disorders; Breathing; Pulmonary-system; Inhalants; Exposure-methods
Aerosols in the mining and industrial work environments, Vol. 3, instrumentation
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Content source: National Institute for Occupational Safety and Health Education and Information Division