Fire Protection of Weapon Storage and Water Mist Redundancy Philosophies
Technical Report,01 Dec 2011,29 Feb 2012
SP Technical Research Institute of Sweden Boras
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The FiST-project New Technologies for Fire Suppression On Board Naval Craft, is a tri-lateral research project under the Canada, the Netherlands, Sweden Cooperative Science and Technology MOU. The focus for the project is active firefighting on navy ships, with a special emphasis on how firefighting systems might perform in a damaged condition. The results of a number of full scale fire tests run at SP Technical Research Institute of Sweden, December 2011-February 2012 are reported. The testing had two objectives. The first was to investigate redundancy solutions for fire suppression systems. To this end, the performance of a low pressure water mist system with reduced capacity and the performance of a redundant extinguishment system attached to a strength bulkhead were investigated. The results of the tests indicated that a low pressure system designed to handle a well-ventilated hydrocarbon fire scenario can suppress the same fire in a less ventilated space with a 50 reduction in water supply. Further if the system is fed by pumps providing water at lower pressure e.g. the fire main, it still has the capacity to suppress a compartment fire. Testing of the bulkhead mounted system indicated that it could extinguish an obstructed diesel pool fire at water flow rates of 12-14 Lm2min provided nozzles that distributed the water spray over the entire test space were used. The second objective was to study the relevance of the weapon storage fire protection water delivery requirements found in Naval Ship Code NSC 24 mmmin or Class DNV 32 mmmin regulations. For the fire scenario studied, the results indicated that lower water flow rates were successful in keeping the temperature of a dummy torpedo below a critical temperature.