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Fire hazard of conveyor belts.

Authors
Mitchell-DW; Murphy-EM; Smith-AF; Polack-SP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 7053, 1967 Dec; :1-14
Link
NIOSHTIC No.
20036650
Abstract
The fire hazard of neoprene, polyvinyl chloride, and rubber conveyor belts was studied at the Federal Bureau of Mines Experimental Coal Mine. The effects of intensity of ignition source, velocity of the ventilating air, and type of belt were investigated at three levels in small-scale gallery experiments. Studies were made in the mine on the effects on ignition and flame propagation of belt-entry dimensions, belt widths, and belt configuration. Methods for extinguishing belt fires were also investigated under simulated mining conditions, and during these trials coal dust and grease were placed on the belt. The research showed that conveyor belts will burn. Neoprene, polyvinyl chloride, and rubber belts, with and without carcass, ignited and propagated flame. The highest rate of flame propagation was obtained on rubber belt. The fire hazard increased with increase in intensity of ignition source and air velocity. Flame propagated only when air was forced through the test zone; propagation was not obtained when forced ventilation was not used, as would exist in a neutral entry in a mine. Automatic water sprays and high-expansion foam effectively arrested flame propagation; direct application of water and bicarbonate dusts was ineffective.
Keywords
Mining-industry; Underground-mining; Coal-mining; Mining-equipment; Mine-fires; Mine-disasters; Ventilation; Fire-extinguishing-agents; Fire-extinguishing-systems; Fire-fighting; Fire-prevention; Fire-retardants
Publication Date
19671201
Document Type
Report of Investigations
Fiscal Year
1968
NTIS Accession No.
NTIS Price
Identifying No.
RI-7053
NIOSH Division
HSRTC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 7053
State
PA
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