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Fire Tests of Stairwell-Sprinkler Systems. Final Report.

pdf icon Fire Tests of Stairwell-Sprinkler Systems. Final Report. (58961 K)
Cooper, L. Y.; O'Neill, J. G.

NBSIR 81-2202; 83 p. April 1981.


Occupational Safety and Health Admin., Washington, DC

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Order number: PB81-205288


sprinkler systems; evaporation cooling; smoke movement; spray nozzles; stairways


The effect of water curtain or spray nozzle fire protection of an open stairwell was studied experimentally. The experimental setup includes a three story stairtower with a contiguous first story burn room. The instrumentation used to measure the flow phenomenology resulting from fire sizes up to 4MW [13.6(10(6)BTU/hr] with and without sprinkler operation is described. A model of evaporation cooling of the hot fire gases as they pass up through the first to second floor stairwell-sprinkler system component is introduced. Based on this model the data are analyzed and correlated for the purpose of identifying both a cooling and a water usage efficiency for each of the system components that were tested. Application of these measured performance characteristics and their extension to stairwell-sprinkler components of different geometries and configurations are discussed.