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Tagged with cryogenics engineering
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Why are propellant tanks filled from the bottom?
It seems that the norm is to (fast-) fill fuel and oxidiser tanks from the bottom. For example, on this drawing of the Saturn S-IC stage you can see the LOX and RP-1 fill valves at the bottom of the ...
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How are fuel tanks filled with cryogenic hydrogen?
Cryogenic hydrogen can react with the atmospheric Oxygen to produce an explosion:
as well as being cold enough to liquefy (and possibly solidify) atmospheric oxygen, which can be an explosion ...
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