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I looked into a paper regarding handling of hydrogen issued by the governing body of German fire department. They advice to let pressure tanks with burning leakage burn out, while cooling with water. They say there is no danger, that the pressure tank might crackle. If the pressure tank gets extremely hot the danger of an implosion exists when the flame flashes back into the tank with decreasing gas pressure They also say that one might need a infrared camera to determine if the leakage really burns. We have Hydrogn combustion engines in cars and trucks since the mid 1990s and I'm not aware of burning or exploding hydrogen tanks. Regards, Volker Edit: BLEVEs (boiling liquid expanding vapor explosion) can occur when a tank containing boiling liquified gas ruptures. In cars and the current Hydrogen use in trains the gas is carried in pressure tanks at about 350 bar, not in liquified form.
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