Details:

Personal Author:
Perzak, F. J. (Frank J.)
Corporate Authors:
United States. Bureau of Mines.
Description:
"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." - NIOSHTIC-2

NIOSH no. 10012539


Subject:
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Coal Mines And Mining -- Fires And Fire Prevention.
Coal Mining.
Conveyor Belts -- Fire Testing.
Fires.
Mine Haulage -- Safety Appliances.

Series:
Report of investigations (United States. Bureau of Mines) ; 9570
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
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urn:sha256:c348aa1b4e7af5f2e958aa082929bbadb3d0756c3e5ebe3767f7dcc081888b46
File Type:

Supporting Files

• No Additional Files

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