The steam turbine power plant has until recently been the first choice for very large power main propulsion units. Its advantages of little or no vibration, low weight, minimal space requirements and low maintenance costs are considerable. Furthermore a turbine can be provided for any power rating likely to be required for marine propulsion [1]. This research deals with the parametric study of marine steam power plants. It studies the effect of the ambient temperature which is considered as the

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... cooling water inlet to the condenser (from 24oC to 35 oC) also the boiler pressure (from 30 bar to 60 bar) on the performance of the steam power plants in both fully loaded ship and ballast conditions. The performance of the power plant concerned with the thermal efficiency, the fuel consumption, the steam mass flow rate, and the mass flow rate of cooling water inlet to condenser. The procedures have been carried out for METHANE KAREELIN as LNG carrier with steam power plant rated for 29 MW. The results showed that, the sailing in cold weather is more favorable for high thermal efficiency, less fuel and steam consumption, also less mass flow of the cooling water inlet to the condenser. Also, it is better to work under high steam pressure for high thermal efficiency, less fuel and steam consumption, and less mass flow of the cooling water inlet to the condenser. But, this pressure is limited to the metallurgy of metals that are bear this pressure as well as not based on the designer. Finally, carrying more cargo increases both the fuel consumption and steam consumption, to keep the ship speed constant as well as possible.