FIELD: storage or distribution of gases or liquids.
SUBSTANCE: invention relates to the storage of liquefied gas. Method for inerting a wall of sealed and thermally insulating tank (1), said wall having a multilayer structure comprising two sealed barriers (2, 4) and one thermally insulating barrier (3). Method includes implementing a first inerting mode in which the gaseous phase of thermally insulating barrier (3) is placed under a relative pressure which is lower than a pressure limit of inflammability Pi of the fuel gas. Method then includes detecting, during the first inerting mode, whether the pressure of the gaseous phase of thermally insulating barrier (3) exceeds said threshold pressure Ps. Method then includes switching from the first inerting mode to a second inerting mode. Second inerting mode includes sweeping thermally insulating barrier (3) with an inert gas.
EFFECT: providing a method and an inerting of a tank wall system for containing liquefied fuel gas that are reliable and make it possible to increase the insulation of the tank.
17 cl, 3 dwg, 3 tbl
