Abstract: An installation for the storage of a liquified gas under pressure in a pressure chamber. The installation includes a closed pressure resistant chamber to contain the liquid. The container has a wall whose thickness es is determined by computations taking into account parameters associated with a pressure Ps within the chamber and a temperature Ts<−50° of the wall of the chamber. The installation further includes a device to indicate a magnitude G of a temperature Ts of the chamber wall and a device to indicate a magnitude G′ representative of the computation temperature Ts. The installation also includes a device to compare the magnitudes G and G′, and a device to lower the pressure to a value P2 below the computed pressure Ps if as a result of the comparison, Te is greater than Ts.