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Document ID (ISN)108717
CIS number 08-1158
Year 2008
Convention or series no. DHHS (NIOSH) Publication No.2008-123
Author(s) Ulery J.P.
Title Explosion hazards from methane emissions related to geologic features in coal mines
Bibliographic information Publications Dissemination, National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Parkway, Cincinnati, OH 45226-2001, USA, Apr. 2008. 18p. Illus. 35 ref.
Internet access http://www.cdc.gov/niosh/mining/pubs/pdfs/2008-123.pdf [in English]
Abstract Explosions in coal mines are caused when buildups of explosive gas and/or dust are ignited by a flame or spark. Methane is normally contained in coal and is liberated during mining. Because this gas is explosive in the range of 5%-15% by volume in air, fresh air is constantly supplied to the working face to prevent the methane/air mixture from reaching this explosive range. The required amount of ventilation air is based on estimates of methane release under normal conditions. Occasionally, unanticipated and unusually high emissions are encountered, which, despite normal ventilation controls, result in an explosive mixture that a spark from a cutting bit or electrical equipment can easily ignite. Investigations have shown that such emissions are often associated with anomalous geologic features or conditions. This report provides operators with specific information on recognizing and alleviating potential hazards from methane emissions related to these geologic features.
Descriptors (primary) geological factors; USA; methane; coal mining; underground mining; explosion hazards; risk factors; fire hazards
Descriptors (secondary) ventilation systems; safety engineering
Document type E - Books, reports, proceedings
Country / State or ProvinceUSA
Subject(s) Mines and quarries
Fire and explosions
Broad subject area(s) Fires, explosions and major hazards
Browse category(ies) Natural phenomena
Fires
Aliphatic and alicyclic hydrocarbons
Mining and quarrying
Explosions