The COPT vacuum condenser is a special purpose heat exchanger used for tanker ships. The pump is operated using a steam turbine when the cargo oil is loaded, and in doing so a vacuum condenser is installed to improve the turbine performance and collect exhaust steam. The condenser is also used to collect steam generated when the inert gas system of a tanker is applied. A high efficiency ejector that extracts inner non-condensed gas or a vacuum pump unit is attached to the vacuum condenser.