CONTROL METHOD OF BOIL OFF-GAS GENERATION AMOUNT DURING RECEIVING OF LIQUEFIED NATURAL GAS

PROBLEM TO BE SOLVED: To reduce total cost of an entire base by controlling BOG generation amount by adequately combining respective feed pipes of a top, a bottom, and a bottom having a funnel part according to liquid density difference between LNG liquid in a ground tank and received LNG. SOLUTION: The tip of a bottom feed pipe 3 disposed through a side part 1a of the ground tank 1 is communicated with the LNG liquid 2 in the ground tank 1, and the top 1b of the ground tank 1 is provided with a top feed pipe 5 and a bottom feed pipe 6 having a funnel part of which lower end communicates with the LNG liquid 2 in the ground tank 1. When LNG 9 is received which has liquid density larger than that of the LNG liquid 2 in the ground tank 1, the top feed pipe 5 and the bottom feed pipe 6 are used in combination. When LNG 4 is received which has liquid density smaller than that of the LNG liquid 2 in the ground tank 1, the bottom feed pipe 3 and the bottom feed pipe 6 are used in combination. Thus, the BOG generating amount during the receiving of LNG is kept at a design level.