Tankerman · Gas Carrier — Reliquefaction vs Boil-Off Use
A fully refrigerated LPG carrier typically controls tank pressure by:
- APumping seawater into the cargo tank
- BVenting all boil-off to atmosphere continuously
- CAdding heat to the cargo
- DRunning a reliquefaction plant that condenses boil-off vapor and returns it to the cargo tanks✓ Correct
Explanation
Fully refrigerated LPG ships carry reliquefaction plant: boil-off vapor is compressed, condensed, and returned as liquid to the tanks, holding cargo temperature and tank pressure without losing cargo. Pressurized (smaller) carriers instead let pressure rise within the tank's design.
Authority: IGC Code; LPG operations references
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