Fire Protection of Large Air Force Hangars
FACTORY MUTUAL RESEARCH CORP NORWOOD MA
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This report describes a study related to the fire protection of large aircraft hangars. The study directly develops and augments a previous effort completed for the Air Force Weapons Laboratory in April 1974. This report discusses the attenuation of Aqueous Film-Forming Foam AFFF in an environment of elevated temperature, foam particle fire plume penetration, supplementary low-level foam systems, floor drainage systems and draft curtains. In addition, 900-sq ft JP-4 fire test results are discussed. The tests were the major effort of the program and were intended to evaluate the general effectiveness of 3 percent and 6 percent AFFF when discharged singly and jointly from overhead and ground level. The results of the study discussed in this report indicate that FC-203 is an extremely effective deluge system agent when applied at design densities of 0.16 gpmsq ft but dramatically loses effectiveness when applied at a rate of 0.125 gpmsq ft at an application rate of 0.1 gmsq ft an oscillating monitor nozzle is capable of achieving 90 percent fire control in 30 to 45 sec under optimum conditions, a performance capable of aircraft protection and the potential for large reduction in water demand with no sacrifice to fire fighting effectiveness exists with closed heat AFFF sprinkler systems in hangars, as contrasted with AFFF deluge systems.
- Terminal Flight Facilities
- Safety Engineering