[Hazard --Event] Fire -- from staticignition of fueltanks duringventing [Consequences] Some of these fires have destroyedvehicles. [Knowledge] The properties of static electricity aregenerally well-known, but are not alwaysapplied by operators of alternative fuelfleets. The generation of staticdischarges from jets is discussed in . "Sparks from Steam," A.F. Anderson, Electronics and Power, January 1978. p. 50-53.. [Background] 
At least a dozen such fires have already occurred as CNGtanks were vented to the atmosphere. Static charges aremore likely to build up where droplets or particles arecontained in a high velocity gas stream. When compressednatural gas escapes, droplets may be formed from coolingand subsequent condensation of water or heavyhydrocarbons in the gas, or from entrained compressor oil.