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Fire detection for conveyor belt entries.

Authors
Litton-CD; Lazzara-CP; Perzak-FJ
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9380, 1991 Jan; :1-23
NIOSHTIC No.
10011046
Abstract
This U.S. Bureau of Mines report details the results of a series of large-scale experiments where small coal fires were used to ignite the conveyor belt at air velocities ranging from 0.76 to 6.1 M/s. In the tests, electrical strip heaters imbedded within a pile of coal were used to heat the coal to a point of flaming ignition. The flaming coal subsequently ignited the conveyor belt located approximately 5 to 10 cm above the coal pile. During the tests, temperature, CO, and smoke levels were continuously measured in order to determine both alarm time and level as the fire intensity progressed through the stages of smoldering coal, flaming coal, and flaming coal plus flaming belt. Analysis of the data leads to certain conditions of air velocity and sensor alarm levels that are required for early detection of conveyor belt entry fires. Two nomographs are presented, which define sensor alarm levels and sensor spacings as a function of belt entry cross-sectional area and belt entry air velocity.
Keywords
Mining-industry; Coal-mining; Underground-mining; Fire-safety; Mine-fires; Mining-equipment; Ignition; Belt-conveyors; Air-flow; Smoke; Carbon-monoxide; Warning-systems
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
RI-9380
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9380
State
PA
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