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The effect of underground mining conditions on the activation of automatic sprinklers.

Authors
Smith-AC; Ryan-MW; Pro-RW; Lazzara-CP
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9492, 1993 Aug :1-20
Link
NIOSHTIC No.
10004785
Abstract
The U.S. Bureau of Mines conducted a study to evaluate the effect of underground mining conditions on the activation of automatic sprinkler heads. Sprinklers were exposed to liquid fuel fires in a rectangular tunnel at airflows of 0, 45, 90, 150, and 250 m/min to determine the effect of ventilation and fire size on the time to activation. As the airflows were increased, the time to activate the sprinklers for a given fire size increased. Also as the fire size increased the activation time decreased. Temperature profiles of the tunnel showed that the maximum temperature near the roof was shifted downstream as the airflow increased. Experiments to determine the effect of rated activation temperature and response time index (RTI) value on activation time showed that the time to activate increased with increasing activation temperature, and decreased with decreasing RTI value.
Keywords
Coal-mines; Mine-fires; Mine-safety; Underground-mining; Sprinkler-systems; Mineral-industries
Publication Date
19930801
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB94-151297
NTIS Price
A03
Identifying No.
RI-9492
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9492
State
PA
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