Vessel for transporting liquefied hydrocarbons

Claim 1

A SHIP FOR TRANSPORTING LIQUEFIED HYDROCARBONS, COMPRISING AN OUTER HULL, AN INNER HULL SPACED FROM SAID OUTER HULL AND DEFINING BALLAST CHAMBERS THEREBETWEEN, AT LEAST ONE THERMALLY INSULATED TANK DISPOSED WITHIN SAID INNER HULL, SAID TANK BEING ADAPTED TO CONTAIN A QUANTITY OF LIQUEFIED HYDROCARBONS AT VERY LOW TEMPERATURES, A PLURALITY OF HYDRAULIC JACKS MOUNTED ALONG THE BOTTOM AND SIDE WALLS OF SAID INNER HULL AND SUPPORTING THE BOTTOM AND SIDE WALLS OF SAID TANK, SAID JACKS BEING ADAPTED TO RETRACT OR EXTEND AS REQUIRED IN RESPONSE TO A COMPONENT OF MOTION OF SAID TANK, AND AN HYDRAULIC PUMP SYSTEM CONNECTED TO SUPPLY PRESSURIZED HYDRAULIC FLUID TO SAID JACKS, SAID JACKS BEING PROVIDED WITH NONRETURN FLUID INLET VALVE MEANS, AND FLUID PRESSURE RELIEF VALVE MEANS WHOSE WORKING PRESSURE IS SELECTED TO LIMIT THE STRESS APPLIED TO THE WALLS OF SAID TANK.