Patent ID: 7690365

Claim:
A fuel gas supply system of an LNG transportation vessel, the system comprising: an LNG storage tank configured to store LNG; a high-pressure gas injection of the LNG vessel; a fuel gas supply line connected from the LNG storage tank to the high-pressure gas injection engine; a first pump device configured to compress the LNG stored in the LNG storage tank and communicate the compressed LNG downstream along the fuel gas supply line; a second pump device in fluid communication with the first pump device to receive the compressed LNG, the second pump device including a high pressure pump installed outside of the LNG storage tank along the fuel gas supply line, the second pump device configured to compress LNG compressed by the first pump, to a high-pressure of 200 to 300 bar, and supply the compressed LNG toward the engine; a gasifying device installed downstream of the second pump device along the fuel gas supply line and configured to gasify the compressed LNG: and a discharge device configured to discharge from the LNG storage tank, boil-off gas generated in the LNG storage tank.