GAS PASSAGE WAY STRUCTURE AND LIQUEFIED NATURAL GAS STORAGE TANK HAVING THE SAME

摘要

PURPOSE: A gas passage structure and a liquefied natural gas storage tank with the same are provided to effectively discharge gas through a simple structure and to instantaneously and effectively repair in malfunction without moving a ship to a dock. CONSTITUTION: A gas passage structure comprises a pipe structure(20) and a pressure control valve(30). The pipe structure penetrates the ceiling of a tank. The pressure control valve is installed in the outside of the pipe structure and controls the internal pressure of the tank. The pipe structure comprises a gas discharge pipe. The gas discharge pipe penetrates on the top of the pipe structure and comprises a first discharge pipe and a second discharge pipe. Gas in the tank is discharged to the outside through the first or second discharge pipe according to the internal pressure of the tank.