US 11,698,169 B2
Vessel for the transport of liquefied gas and method of operating the vessel
Mark Andrew Hodgson, London (GB); and Stephen Andrew Brown, London (GB)
Assigned to SHELL USA, INC., Houston, TX (US)
Appl. No. 16/471,075
Filed by SHELL OIL COMPANY, Houston, TX (US)
PCT Filed Dec. 19, 2017, PCT No. PCT/EP2017/083597
§ 371(c)(1), (2) Date Jun. 19, 2019,
PCT Pub. No. WO2018/114981, PCT Pub. Date Jun. 28, 2018.
Claims priority of application No. 16206573 (EP), filed on Dec. 23, 2016.
Prior Publication US 2019/0323659 A1, Oct. 24, 2019
Int. Cl. F17C 1/00 (2006.01); F17C 13/00 (2006.01); F25J 1/00 (2006.01)
CPC F17C 1/002 (2013.01) [F17C 13/002 (2013.01); F25J 1/0025 (2013.01); F17C 2201/052 (2013.01); F17C 2221/033 (2013.01); F17C 2223/0123 (2013.01); F17C 2223/0161 (2013.01); F17C 2223/033 (2013.01); F17C 2223/043 (2013.01); F17C 2223/046 (2013.01); F17C 2225/0161 (2013.01); F17C 2225/033 (2013.01); F17C 2225/035 (2013.01); F17C 2225/044 (2013.01); F17C 2225/046 (2013.01); F17C 2227/0135 (2013.01); F17C 2227/0157 (2013.01); F17C 2227/039 (2013.01); F17C 2227/0339 (2013.01); F17C 2250/01 (2013.01); F17C 2265/034 (2013.01); F17C 2265/066 (2013.01); F17C 2270/0105 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for the transport of liquefied gas, comprising:
transporting liquefied gas in a vessel, the vessel comprising:
a hull,
at least one cargo storage tank arranged in the hull for storing liquefied gas,
at least one engine to propel the vessel;
receiving boil-off gas at a compressor inlet of at least one compressor, the compressor inlet connected to a vapour space of the at least one cargo storage tank, at a first pressure (P1);
using the compressor to supply pressurized boil-off gas to the at least one engine at a second pressure (P2) exceeding the first pressure;
diverting at least part of the pressurized boil-off gas to a boil-off gas recovery system for recovery of boil-off gas;
recondensing the at least part of the pressurized boil-off gas in a cooling section of the BOG recovery system to provide recondensed pressurized boil-off gas;
storing the recondensed pressurized boil-off gas in at least one recovery tank, wherein the recovery tank having a total volume for storing the recondensed pressurized boil-off gas being in the order of about 0.5% to 5% of the total volume of the at least one cargo tank.