This seems to be the reason why ST has been used for the LNG carriers.
Recently, environment friendliness and safety are being discussed actively and globally. The outcome of these discussions will undoubtedly have an effect on the selection and planning of the propulsion system of LNG carriers.
Under the assumed conditions of this paper, GIDE2 is the most competitive alternatives based on the propulsion redundancy and the environment friendliness.
For GIDE propulsion, due to high thermal efficiency, BOG is dumped at low speed operation below the normal service rating. Therefore, in case of GIDE propulsion it may be necessary to reevaluate the design boil off rate according to the fuel oil/gas unit price.
 Sasaki, K. et al, "Gas Injection Diesel Engine Propulsion Plant for Next Generation LNG Carriers", LNG11(1995)
 MAN B&W Diesel A/S "Comparative Study of Propulsion Alternatives for LNG Carriers", License Letter LL99-36(1999) Beppu, O. et al, "Service Experience of Mitsui Gas Injection Diesel Engines", CIMAC '98, (1998)
 "40MW Gas Injection Diesel Power Generation Plant", Mitsui Zosen Technical Review No.155(1995)