PURPOSE: A shipbuilding method is provided to make a high-capacity tank without increasing the production costs of the tank and to reduce a waste of BOG(Boil-Off Gas). CONSTITUTION: A shipbuilding method is to build a ship by providing a re-gasification device and an LNG storage tank on for a ship and by adding a stiffener to the LNG storage tank for reinforcing stiffness. The shipbuilding method allows the increase of the steam pressure in the LNG storage tank and of the temperature of LNG during the transportation of LNG in the LNG storage tank. [Reference numerals] (AA) Inflow amount of heat to an LNG storage tank of an LNG carrier; (BB) Prior art; (CC) Present invention; (DD) Evaporating LNG to contribute to the generation of boil-off gas; (EE) Increasing the sensible heat of NG and LNG to contribute to the increase of internal energy
