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Inerting and extinguishment of aerozine-50 with water and/or CF3Br.
Burgess-DS; Martindill-GH; Murphy-JN; Perzak-FJ; Singer-JM; Van DoIaii-RW
J Spacecr Rockets 1969 Nov; 6(11):1259-1268
Two parts by weight of water per part of aerozine-50 (A-50) will "inert" a spill of A-50 against ignition in air. In the case of a burning A-50 pool, the fuel evaporation rate is about 0.6 Lb/min-ft2 during most of the duration of burning, and a well-distributed spray of 1.2 lb water/min-ft2 of liquid surface is sufficient for extinguishment. To inert an A-50 spill against hypergolic ignition with N2O4, as much as 10 lb of water are required per lb of fuel, depending on the circumstances of mixing. In situations where use of large amounts of water may not be practical, CF3Br (Halon 1301) can abate fire hazards; 70 percent of CF3Br in the atmosphere will inert a small spill at room temperature against ignition by spark or pilot flame. The same concentration would extinguish most secondary fires ignited by the hypergolic reaction of A-50 and N2O4, but impracticably high concentrations of CF3Br would be required to extinguish an established A-50 pool fire or to inert the maximum vapor concentrations of A-50 possible in a closed chamber.
Fuels; Fire-extinguishing-agents; Fire-prevention; Fire-fighting
OP; Journal Article
Issue of Publication
Journal of Spacecraft and Rockets
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division