For most of crude vessels, Cargo pump attached at cargo turbine is run by steam during cargo oil loading, and Vacuum condenser is installed in the rear of turbine to maximize turbine's efficiency by decreasing back pressure and to retrieve steam for the purpose of recycling into boiling water.
　　In case of tanker, Boiler is used to generate inert gas and formation of steam is inevitable.
　　This steam is changed to boiling water by vacuum condenser.Also, Vacuum condenser has ejector & ejector condenser or vacuum pump unit to eliminate non-condensable gas.