LNG carrier uses boil off gas as driving force of main boilerduring its operation and steam generated by boiler is used for maindriving force and running a generator

However, temperature of the happened natural gas is not enoughto be heat source, so the gas needs to be heated by an equipment,which is called gas heater

When NG gas gets decreased thanks to carrier's voyage in coldarea or high speed operation, it is necessary to install LNGvaporizer to increase amount of NG gas by compulsory vaporizationof LNG for boiler's proper operation