Abstract: The present invention relates to a method and system for storing cold fluid. The system includes a main tank and an auxiliary tank that are in fluid communication, and the auxiliary tank receives vapor and expanding fluid as the cold fluid in the main tank warms thereby avoiding overpressurization of the system.

Abstract: Refrigeration is produced by compressing a multi-component refrigerant to a high pressure, cooling the high pressure refrigerant to produce a refrigerant having a vapor phase and a liquid phase, separating the two phase refrigerant into a vapor phase and a liquid phase, passing the refrigerant vapor phase through heat exchanger means to cool and condense it to a liquid, expanding the so-formed cold stream of condensed liquid to a colder low pressure stream, passing it back through the heat exchanger means to provide low temperature refrigeration thereto to cool the high pressure vapor stream fed therethrough and have extra refrigeration for removing heat from a product, and expanding the separated high pressure liquid phase to a low pressure cool stream, feeding the low pressure cool stream to an intermediate point in the heat exchanger means, combining said stream with the cold low pressure stream formed from the vapor removed from the vessel to provide warm temperature refrigeration to remove heat from the