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A large number of ships powered by gas turbines and medium and slow speed diesel recover waste beat from exhaust gases and utilize the heat for power generation and miscellaneous ship’s service steam. On tankers, this waste recovery steam system is also used to heat hot water for tank cleaning and to provide for cargo heating. This system is often used in conjunction with oil-fired auxiliary boilers to provide steam for driving the cargo pumps. This bulletin describes some of the options available to the shipowner with respect to waste heat boiler types and system considerations.