Ignition and Fire Suppression in Aerospace Vehicles
Technical rept. 1 Jan 1970-30 Nov 1971
BUREAU OF MINES PITTSBURGH PA PITTSBURGH MINING AND SAFETY RESEARCH CENTER
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Several halogenated hydrocarbons were evaluated as possible ignition or explosion suppressants for aircraft fuel tanks in which ignitions are initiated by incendiary ammunition. The inhibitors included Halons 2402 C2F4Br2, 1301 CF3Br, 1202 CF2Br2, 1211 CF2ClBr, and 1011 CH2ClBr. Their effectiveness in retarding ignition or propagation of n-pentane-air mixtures was investigated with heated wires, exploding wires, and an incendiary composition. Large-scale experiments were conducted with Halon 1301 to determine its effectiveness and toxicity hazard in extinguishing Class A fires by the total flooding mode. A 6 percent Halon concentration was adequate for rapid extinguishment of cotton sheeting, paper sheeting, and nylon-paper sheeting fires. The toxic product formation varied with preburn time, combustible loading, and the extinguisher discharge mode. In addition, similar data are presented from small-scale experiments with Halon 38 C3F8, which is less effective than Halon 1301 as an extinguishant.
- Safety Engineering