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Mining Publication: Flammability Limit Measurements for Dusts in 20-L and 1-m3 Vessels
Keywords: Coal dust Flammability
Original creation date: May 2000
Authors: JE Going, K Chatrathi, KL Cashdollar
Peer Reviewed Journal Article - May 2000
Download PDF Document (0.88 MB)
NIOSHTIC2 Number: 20022708
J Loss Prev Process Ind 2003 May 13(3):209-219
Two types of flammability limits have been measured for various dusts in the Fike 1-m3 (1000-L) chamber and in the Pittsburgh Research Laboratory (PRL) 20-L chamber. The first limit is the minimum explosible concentration (MEC), which was measured at several ignition energies. In addition to the three dusts studied previously (bituminous coal, anthracite coal, and gilsonite), this work continues the effort by adding three additional dusts: RoRo93, lycopodium, and iron powder. These materials were chosen to extend the testing to non-coal materials as well as to a metallic dust. The new MEC data corroborates the previous observations that very strong igniters can overdrive the ignition in the smaller 20-L chamber. Recommendations are given in regard to appropriate ignition energies to be used in the two chambers. The study also considered the other limiting component, oxygen. Limiting oxygen concentration (LOC) testing was performed in the same 20-L and 1-m3 vessels for gilsonite, bituminous coal, RoRo93, and aluminum dusts. The objective was to establish the protocol for testing at different volumes. A limited investigation was made into overdriving in the 20-L vessel. The LOC results tended to show slightly lower results for the smaller test volume. The results indicated that overdriving could occur at that ignition energies of 2.5kJ in the 20-L vessel would yield comparable results to those in the 1-m3 vessel using 10.0kJ. The studies also illustrate the importance of dust concentration on LOC determinations.
Image of publication Flammability Limit Measurements for Dusts in 20-L and 1-m3 VesselsPeer Reviewed Journal Article - May 2000
Download PDF Document (0.88 MB)
NIOSHTIC2 Number: 20022708
J Loss Prev Process Ind 2003 May 13(3):209-219
See Also
Airborne Dust Liberation During Coal Crushing
Coal Dust Explosibility Meter Evaluation and Recommendations for Application
Coal-Dust Explosion Tests in the Experimental Mine 1919 to 1924, Inclusive
Determining the Spatial Variability of Personal Sampler Inlet Locations
Differential Pressure Response of 25-mm-Diameter Glass Fiber Filters Challenged with Coal and Limestone Dust Mixtures
Evaluation of the Bagged Stone Dust Barrier Effectiveness in a Bord and Pillar Mine
The Limiting Oxygen Concentration and Flammability Limits of Gases and Gas Mixtures
Rock Dusting Considerations in Underground Coal Mines
Status of a Tapered Element, Oscillation Microbalance-Based Continuous Respirable Coal Mine Dust Monitor
Technology News 515 - Float Coal Dust Explosion Hazards
Page last reviewed: June 29, 2015
Page last updated: June 29, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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