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Which risk increases when rapid depressurization causes phase transition in cryogenic fuel tanks?

A)Vapor lock obstructing fuel flow
B)Icing of vent valves from air humidity
C)Corrosion of tank walls from oxygen
D)Overpressurization from gas expansion

💡 Explanation

When rapid depressurization occurs, the cryogenic fuel undergoes rapid phase transition (liquid to gas) because heat influx leads to volumetric expansion according to the Peng-Robinson equation of state, raising pressure inside the tank. Therefore, overpressurization is likely, rather than vapor lock, icing, or corrosion, conditions that require leaks, moisture, or oxidizers.

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