This paper describes the results of development regarding a large flat bottom cylindrical liquid hydrogen tank. Since a liquid hydrogen tank is required 10 times higher thermal insulation performance than an LNG tank, thermal insulation structure is the most important issue. In the roof and the shell part, mounting construction method of the multilayer insulation that enables high workability and hardly deteriorating thermal insulation performance has been devised. In the bottom part, the hollow sectional GFRP support that copes with both high buckling strength and high thermal insulation performance has been devised. Regarding the anchor strap, high thermal insulation performance has been achieved by using CFRP member maintaining high tensile rigidity and high tensile strength. The calculated boil off gas rate of 10,000m
3 liquid hydrogen tank applying devised thermal insulating structures has been less than 0.1%.
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