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From Scotia to Brookwood, fatal US underground coal mine explosions ignited in intake air courses.

Authors
Dubaniewicz-TH Jr.
Source
J Loss Prev Process Ind 2009 Jan; 22(1):52-58
NIOSHTIC No.
20034793
Abstract
The National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, conducted a study of past mine explosions to identify the ignition locations and ignition sources responsible for the most severe explosion events resulting in death. Since the Scotia disaster of 1976, many fatalities from underground coal mine explosions have been linked to nonpermissible electrical equipment ignition sources located in intake air courses. With few exceptions, explosion protected equipment is generally not required in intake air courses of gassy underground coal mines in the US. Cigarette lighters were another prevalent ignition source for fatal explosions ignited in intake air courses. Several mine rescue/ recovery teams have encountered electrical ignition hazards. The study provides evidence that intake air courses of gassy underground coal mines fit the description of certain Hazardous (classified) locations described in the US National Electrical Code. Class I Division 2 or Zone 2 explosion protection techniques may be used to design intake air equipment so that it does not present an ignition source under normal operation, before mine power is shut down in emergency situations. Nonpermissible circuits in intake air courses that are likely to remain energized during emergencies, e.g. battery powered equipment, should be protected by more stringent Class I Division 1, Zone 1, or Zone 0 techniques, to protect rescue/recovery personnel.
Keywords
Mining-industry; Mine-fires; Mine-disasters; Explosions; Ignition-sources; Ignition-point; Traumatic-injuries; Coal-mining; Underground-mining; Mine-rescue; Mine-workers; Author Keywords: Traumatic injuries; Mining; Explosions; Class I hazardous location; Coal mines
Contact
Thomas H. Dubaniewicz Jr., National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236, USA
CODEN
JLPIE9
Publication Date
20090101
Document Type
Journal Article
Email Address
tcd5@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0950-4230
NIOSH Division
PRL
Priority Area
Mining
Source Name
Journal of Loss Prevention in the Process Industries
State
PA
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