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Mining Publication: Rapid (Grab) Sampling During Full-scale Explosions - Microscopic and Analytical Evaluation
Keywords: Dust measurement instruments Dusts Explosions Fires Gas measurement instruments 
 Gases Monitoring
Original creation date: January 1988
Authors: RS Conti, IA Zlochower, MJ Sapko
Report of Investigations - January 1988
Download PDF Document (3.18 MB)
NIOSHTIC2 Number: 10006240
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 9192, NTIS No. PB90-268756, 1988; :1-17
The Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion. The sampling system consists of an aluminum housing that incorporates two 30-cm3 preevacuated glass vials with rubber septums. Upon actuation, the sampling probe needle is driven through the septum with a pressurized air pulse, filling the tube with gas and dust from the mine explosion. After a predetermined time, the sampling probe needle is retracted by a second high-pressure air pulse to its normal (quiescent) state, allowing the sampling tube to reseal. The onset and the duration of sampling are independently variable and controlled by a time-delay relay package. This technique enables the monitoring of pyrolysis-charring in coal particles and the generation and combustion of the pyrolysis vapors in both large- and small-scale explosions. The following results were obtained from full-scale dust explosion tests at the Bureau of Mines Lake Lynn Laboratory: (1) gas sampling of the leading edge of the flame front shows the large concentration changes, characteristic of the flame front; (2) gas samples taken entirely in the flame zone consist of pyrolysis and combustion products with very low residual oxygen; and (3) the particles collected in the flame zone show signs of extensive pyrolysis and charring.
Image of publication Rapid (Grab) Sampling During Full-scale Explosions - Microscopic and Analytical EvaluationReport of Investigations - January 1988
Download PDF Document (3.18 MB)
NIOSHTIC2 Number: 10006240
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 9192, NTIS No. PB90-268756, 1988; :1-17
See Also
A 20-Liter Furnace Test Method to Determine the Combustion Gas Toxicity of Conveyor Belts
Determining the Root Causes of Flame Cutting and Welding Fires in Underground U.S. Coal Mines
Evaluation of the Bagged Stone Dust Barrier Effectiveness in a Bord and Pillar Mine
Experimental Mine and Laboratory Dust Explosion Research at NIOSH
Explosion Temperatures and Pressures of Metals and Other Elemental Dust Clouds
Initial Study of Buried Communication Cable for Underground Mines
The Modified Direct Method: A Solution for Obtaining Accurate Coal Desorption Measurements
Optically Powered Remote Gas Monitor
A Review of Recent Accidents Involving Explosives Transport
Technology News 490 - An Inexpensive Device for Monitoring Explosions in Sealed Areas of Underground Mines
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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