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A method to eliminate explosion hazards in auger highwall.

Authors
Volkwein-JC; Ulery-JP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9462, 1993 Jan; :1-14
NIOSHTIC No.
10012096
Abstract
The U.S. Bureau of Mines investigated a method of using inert gas to prevent the formation of explosive gas mixtures in auger highwall mining of coal. A combination of gasoline and diesel engine exhaust gases was introduced into the auger drill hole using a short section of pipe located at the collar. Gas samples were taken and analyzed on-site with infrared detectors for oxygen, carbon dioxide, methane, and carbon monoxide. Evacuated bottle samples were also taken an analyzed by gas chromatography in the laboratory. These gas results were analyzed for explosibility. Coal samples from various depths were used to obtain the gas content of the coal using the modified direct method. Personal exposure to carbon monoxide was also monitored. The highest methane level observed was 9.55%. The levels of inert gas (carbon dioxide and nitrogen) were significantly high to prevent any ignition of the methane. Results showed that for all conditions during mining, gas concentrations were nonexplosive. The gas content of the coal was about 0.30 cm3/g. The maximum personal time-weighted average sample for carbon monoxide was 20 ppm. This system provides a safe, inexpensive, simple method for preventing explosions during auger mining.
Keywords
Mining-industry; Explosion; Explosion-prevention; Explosions; Explosive-hazards; Explosive-gases
Contact
NIOSH Pittsburgh Research Labortory, P.O. Box 18070, Pittsburgh, PA 15236
CAS No.
74-82-8; 124-38-9; 630-08-0; 7782-44-7; 7727-37-9
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-190411
NTIS Price
A03
Identifying No.
RI-9462
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9462
State
PA; KY
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