Details:

Personal Author:
Volkwein, J. C. (Jon C.) ; Ulery, J. P. (James P.)
Volkwein, J. C. (Jon C.) ; Ulery, J. P. (James P.) Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"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 and analyzed by gas chromatography at the Pittsburgh Research Center. These gas results were analyzed for expIosibility. Personal exposure to carbon monoxide was also monitored. The highest methane level observed was 9.5 pct. The inert gas levels, (carbon dioxide and nitrogen) were sufficiently high to prevent any ignition of the methane. Results showed that for all conditions during mining, gas concentrations were non-explosive. 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." - NIOSHTIC-2
Subject:
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Coal Augers.
Gases, Rare -- Testing.
Mine Explosions -- Prevention.

Series:
Report of investigations (United States. Bureau of Mines) ; 9462
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:730b6f1c682f4cbcadd7bccd3588bbbc285a6212a99b1913da20b4e74d528e87
File Type:

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