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A fail-safe control system for a mine methane pipeline.

Authors
Irani-MC; Kapsch-FF; Jeran-PW; Pepperney-SJ
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8424, 1980 Jan; :1-11
NIOSHTIC No.
10000714
Abstract
The Bureau of Mines has designed and put into operation a fail-safe control system for use in underground coal mines equipped with methane drainage pipelines. This control system can detect certain unsafe conditions and respond by automatically shutting off the flow of methane from the degasification borehole to the drainage pipeline. Methane flow is shut off when the methane content in the return airways reaches a predetermined level (typically 1.5 pct), when the methane drainage pipeline is ruptured by roof fall, or when there is an electric power failure. The fail-safe control system was designed using commercially available components and a methane analyzer system previously developed by the Bureau. The fail-safe system consists of a unit that combines a shutoff valve and pneumatic valve actuator, and electronic and mechanical equipment designed to detect hazards and effect shutdown. The fail-safe control system was designed to meet regulatory requirements for the same operation of underground methane pipelines used for mine degasification. MSHA has inspected and tested this system and permitted its use in two mines.
Keywords
Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Explosive-gases; Explosive-atmospheres; Underground-mining; Coal-mining; Control-technology; Engineering-controls
CAS No.
74-82-8
Publication Date
19800101
Document Type
IH; Report of Investigations
Fiscal Year
1980
NTIS Accession No.
NTIS Price
Identifying No.
RI-8424
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8424
State
PA
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