National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Effect of Underground Mining Conditions on the Activation of Automatic Sprinklers.

PB94151297

Publication Date	1993
Personal Author	Smith, A. C.; Ryan, M. W.; Pro, R. W.; Lazzara, C. P.
Page Count	20
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	Underground mining Sprinkler systems Activation Coal mines Mine fires Mine safety Tests Air flow
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199411

Effect of Underground Mining Conditions on the Activation of Automatic Sprinklers.

Effect of Underground Mining Conditions on the Activation of Automatic Sprinklers.
PB94151297

Publication Date	1993
Personal Author	Smith, A. C.; Ryan, M. W.; Pro, R. W.; Lazzara, C. P.
Page Count	20
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	Underground mining Sprinkler systems Activation Coal mines Mine fires Mine safety Tests Air flow
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Pittsburgh, PA. Pittsburgh Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199411