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Hazards of conveyor belt fires.

Authors
Perzak-FJ; Litton-CD; Mura-KE; Lazzara-CP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9570, 1995 May; :1-33
Link
NIOSHTIC No.
10012539
Abstract
The report describes a U.S. Bureau of Mines' study on the hazards of large-scale conveyor belt fires as a function of both air velocity and distance from belt surface to gallery roof. The fire hazards considered were smoke obscuration, toxic effects of carbon monoxide (CO), and elevated air temperatures downstream of the fire. All of these hazards scale with the ratio of fire intensity to ventilation airflow. These hazards were all found to be greater at the lower belt-to-roof distance, owing to the greater fire intensities that resulted. The hazards of smoke obscuration and elevated CO levels were greater at lower air velocities. Smoke obscuration was found to be the earliest hazard, reaching critical levels before the stage of belt flame spread. Critical levels of CO and downstream air temperatures were not reached until the later stages of flame spread. Fire growth rates during rapid flame spread were much greater than the fire growth rates measured during the early stages of belt burning. Data were analyzed to determine the early-warning capability of fire sensors. Smoke sensors provided the earliest warning, followed closely by CO sensors. Thermal sensors did not exhibit any early warning capability.
Keywords
Mine-fires; Mining-equipment; Mining-industry; Toxic-gases; Fire-hazards; Fire-safety
CAS No.
630-08-0
Publication Date
19950501
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-264792
NTIS Price
A04
Identifying No.
RI-9570
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9570
State
PA
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