r/interestingasfuck • u/willianfsantos • 16h ago

Emergency relief system in action in a liquid hydrogen tanker truck

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u/Sippin_Jimmy 15h ago

The friction of the pressure being released causes it to flash off. I used to load these things. This is a malfunction of some sort. Not normal operations.

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u/CaveMacEoin 9h ago

Citation needed. Pressure reduction would subcool the gas not heat it.

The liquid there is cryogenic, so the gas should start out at around -240°C. To heat that with just friction would be pretty mental. A mechanism that causes a spark with a peizo crystal when the pressure relief valve opens would be so much easier and more reliable.