On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?

Correct Answer: Option A — All boil-off vapor is normally burned in the boilers, and any excess steam generated is controlled by the "steam dump system".

LNG carriers burn continuous boil-off gas in marine boilers for propulsion and auxiliary power. When steam demand is low, the excess generated by burning boil-off is safely bypassed and condensed via the steam dump system into the main condenser, maintaining tank pressure per 46 CFR standards.