Patent ID: 8091494

Claim:
A cryogenic tank ( 1 ) for liquefied gas with a planar tank bottom structure ( 10 ) supporting a tank wall structure ( 11 ), comprising a central single point hub ( 2 ) in said planar tank bottom structure ( 10 ), said central single point hub ( 2 ) having a substantially smaller diameter than a diameter of said tank bottom structure ( 10 ), said central single point hub ( 2 ) adapted for being retained by a corresponding hub retainer ( 20 ) on a tank support structural floor ( 23 ), said hub retainer ( 20 ) generally providing radially directed retention forces to said central single point hub ( 2 ) in the plane of said planar tank bottom structure ( 10 ) both when said cryogenic tank ( 1 ) is operating at cryogenic temperatures and when empty at ambient temperature.