Installation for storage of a liquified gas under pressure

Process for storage of a liquified gas under pressure in a pressure resistant chamber, comprising the following steps:

• computing the thickness of the wall of said chamber by using parameters corresponding to a pressure Ps within the chamber and to a temperature Ts (Ts<−50° C.) of said chamber, by which there is obtained a thickness es,
• providing a pressure resistant chamber whose thickness is equal to es,
• filling said chamber with said liquified gas,
• measuring a magnitude G representative of temperature Te effective on the wall of said chamber progressively as said internal gas in said chamber is withdrawn,
• comparing said measured magnitude G to a reference magnitude (G′) of the same nature as the measured magnitude G, representative of said temperature Ts,
• lowering the pressure in the chamber to a value P2 lower than Ps if the temperature Te becomes greater than the temperature Ts.

A pressurized liquid gas installation, comprising:

• a pressure chamber having a wall thickness defined by a calculation determined by a safety standard for a calculation ambient temperature ≦K, for storing a liquefied gas under a service pressure Ps;
• a measuring device for measuring a level of liquefied gas in the pressure chamber;
• a control valve, a conduit being connected between the pressure chamber and a first side of the control valve;
• a pressure limiter connected to a second side of the control valve and having an adjustment pressure P1, P1 <Ps;
• and
• a comparator circuit for comparing the measured level of liquefied gas in the circuit, with a reference level, wherein when the measured level is less than the reference level, as detected by the measuring device and compared by the comparator circuit, the control valve is opened and the pressure limiter lowers the adjustment pressure;
• wherein the pressure chamber in the liquid gas installation is disposed in an environment having an actual ambient temperature of >K.

A pressurized liquid gas installation, comprising:

• a pressure chamber having a wall thickness defined by a calculation determined by a safety standard for a calculation ambient temperature ≦K, for storing a liquefied gas at a service pressure Ps and a service temperature Ts;
• at least one temperature measuring device for measuring a temperature Te of an external wall of the pressure chamber;
• a control valve, a conduit being connected between the pressure chamber and a first side of the control valve;
• a pressure limiter connected to a second side of the control valve and having an adjustment pressure P1, P1 <Ps;
• and
• a comparator circuit for comparing the external wall temperature, with the service temperature, wherein when the measured external temperature is greater than the service temperature, the control valve is opened and the pressure limiter lowers the adjustment pressure which correspondingly lowers the external wall temperature;
• wherein the pressure chamber in the liquid gas installation is disposed in an environment having an actual ambient temperature of >K.