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Challenges to MET Institutions (03), Boil off implications During ballast voyages an amount of cargo (called ‘heel’) is left behind for boiler consumption (sometimes through forced vaporisation) and for pre-cooling before the next loading., Boil off implications The LNG vessels do not normally have onboard re-liquification plant and the insulation is not 100%, MET Institutions Challenges Classified into Cryogenic nature of cargo, MET Institutions Challenges Classified into Boil off, MET Institutions Challenges Classified into Double containment, Boil off implications Venting of this boil off is not normally allowed by the classification societies., Boil off implications There is a constant heat leakage into the cargo systems. Hence, there is continuous boil off of the cargo., MET Institutions Challenges Classified into Propulsion system, Boil off implications The boil off is burnt in a steam propulsion boiler. A steam dumping system is provided to dispose the excess energy to the sea.