Installation and method for storing liquefied gas

A storage installation for liquefied gas liquefied natural gas, in particular on board a ship, the installation comprising:

• a plurality of storage tanks each designed to contain the liquefied gas, each storage tank comprising a lower portion configured to contain the liquefied gas in a liquid state, and an upper portion configured to contain vapors from the liquefied gas, wherein the plurality of storage tanks comprises a first storage tank, wherein each of the plurality of storage tanks further comprises a degassing line comprising a first end connected to the upper portion of the respective tank and a second end connected to at least one recovery zone, wherein the degassing line of each storage tank, other than the degassing line of the first storage tank, comprises a third end connected to the upper portion of the first storage tank;
• a cooling circuit provided with a refrigeration device, the cooling circuit comprising a withdrawal line comprising a first end opening into the lower portion of the first storage tank and a second end connected to an inlet of the refrigeration device, the refrigeration device being configured to cool a fluid flow circulating between the inlet and an outlet of the refrigeration device, the cooling circuit comprising a plurality of first injection lines connecting the outlet of the refrigeration device to each of the plurality of storage tanks respectively,
• a set of control valves located at least in the cooling circuit;
• and
• an electronic control member in communication with said control valves, the electronic control member being configured to command an opening and closing of the control valves, wherein the electronic control member comprises a processor and memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the processor to perform operations comprising:
• cooling the fluid contained in the first storage tank via the cooling circuit by drawing liquid from the first storage tank;
• cooling said drawn liquid in the refrigeration device to form a cooled liquid;
• splitting the cooled liquid into a first stream and a second stream;
• reinjecting the first stream into the first storage tank;
• identifying an empty storage tank from the plurality of storage tanks;
• and
• injecting the second stream into the identified empty storage tank via the plurality of first injection lines and transferring the boil-off gas generated in the identified empty storage tank to the first storage tank via the third end or ends of the degassing line.