Analisis Kelayakan Penggunaan Sistem Kombinasi LNG  Gas Turbine, Heat Recovery Steam Generator Dan Steam  Generator Sebagai Sistem Propulsi Utama Kapal Small LNG  Carrier 8000 Cbm = Feasibility Analysis of Using a Combination System of  LNG Gas Turbine, Heat Recovery Steam Generator and  Steam Generator as the Main Propulsion System for Small  LNG Carrier 8000 CBM Ships