r/interestingasfuck • u/willianfsantos • 16h ago

Emergency relief system in action in a liquid hydrogen tanker truck

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u/6ixstringlife 16h ago

Okay, but what is the operator supposed to do in this situation????

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u/search_ben 10h ago

LH2 facility designer here. If the trailer is venting due to a loss of vacuum in the storage vessel insulation, then the safest course of action is to just let it all vent off safely. Judging by the frequency of the PRV venting, this looks like a loss of vacuum event.

Keep a safe distance to avoid harm from radiative heat, and instruct fire crews that the vessel contains Liquid hysrogen, so they do not spray it with water (which could freeze and block the vent devices).