In one embodiment, a pressure control assembly includes a cylindrical hollow body having an opening to receive a ballast gas, a first and second flange, and a first and second cone. The first flange is coupled to a first end of the body, and a second flange is coupled to an opposing end of the body. The first cone is coupled to the first flange, and the second cone is coupled to the second flange. A method for controlling pressure in a chamber includes measuring a pressure of the chamber and a pressure of an exhaust system coupled to the chamber. The method includes dynamically adjusting the pressure in the exhaust system in order to adjust the pressure in the chamber, by creating a first pressure drop that is greater than a second pressure drop in the exhaust system.

A cryogenic dewar may include an inner tank and an outer tank. The cryogenic dewar may further include a plurality of trunnion mounts. A first four of the trunnion mounts may be coupled between a front half of the inner tank and a front half of the outer tank. A second four of the trunnion mounts may be coupled between a rear half of the inner tank and a rear half of the outer tank. The trunnion mount may be further strengthen with a plurality of pie-shaped reinforcing pads welded to each other and to an outer surface of the inner tank.

This invention describes a novel design and construction method for a Collapsible Cryogenic Storage Vessel that can be used for storing cryogenic liquids. The vessel provides the ability to be packed for transport in a compact state and erected at the point of use. The vessel can be used multiple times. The vessel's volume can also be adjusted during use to minimize or eliminate head space in the vessel.

A cryogenic fluid cylinder includes an inner vessel for holding cryogenic fluid, a cylindrically shaped outer vessel having a vertical longitudinal axis surrounds the inner vessel and forms an insulating space there between, and operating controls located on a top of the outer vessel. Customer or end user operating controls include a liquid-use valve for selectively dispensing liquid cryogen, a pressure-building valve for selectively controlling a pressure building circuit, and a gas-use valve for selectively dispensing cryogen gas. Supplier or maintenance personnel operating controls include an economizer regulator for selectively setting at least one desired pressure of the inner vessel, a vent valve for selectively venting cryogen fluid, and a vacuum pressure port for indicating vacuum pressure between the vessels. The end user controls are located on a front side of the outer vessel while the supplier controls are located on a rear side of the outer vessel.

A flow of liquid cryogen from a liquid cryogen storage tank is vaporized at a heat exchanger against a flow of air in order to vaporize the liquid cryogen for a point of use and provide a flow of chilled air for use in refrigeration of a space, room or structure. The tank, heat exchanger, point of use, and space, room or structure are all located at a same installation.

A flow of liquid cryogen from a liquid cryogen storage tank is vaporized at a heat exchanger against a flow of air in order to vaporize the liquid cryogen for a point of use and provide a flow of chilled air for use in refrigeration of a space, room or structure. The tank, heat exchanger, point of use, and space, room or structure are all located at a same installation.

A method for controlling the pressure in an underground storage volume, wherein the underground storage volume is at least in part filled with an incompressible fluid, the pressure is monitored, a compressible fluid can be introduced into and extracted from the underground storage volume, if the pressure reaches a predetermined upper pressure limit incompressible fluid is extracted from the underground storage volume for reducing the pressure in the underground storage volume; if the pressure volume reaches a predetermined lower pressure limit incompressible fluid is introduced into the underground storage volume for increasing the pressure in the underground storage volume. The method according to the present invention allows the increase the amount of compressible fluid like helium stored in an underground storage volume, e.g. a salt cavern, by adjusting the pressure by the introduction or extraction of an incompressible fluid like brine.

A method and system of storing and transporting gases comprising mixing the gases with liquid natural gas to form a mixture. The mixture is a liquid-liquid mixture or slurry, and is stored in vessel configured for maintaining the mixture at a first location. The mixture is transported to a second location for storage in vessel for maintaining the mixture. The mixture is removed from the second location storage vessel for separation and use in additional processes.

An inner and outer tank connection device for a cryogenic storage tank includes a suspension belt; a first connection assembly for connecting the outer tank, wherein the first connection assembly includes a first connection seat and a first connection member, and the first connection seat is configured for connecting the outer tank and the first connection seat is provided with a first limiting seat, the first connection member is rotatably connected to one end of the suspension belt, and the first connection member is provided with a first limiting portion, and the first limiting portion fits with the first limiting seat to limit the first connection member from twisting on the first connection seat with the suspension belt as a rotation axis; and a second connection assembly for connecting the inner tank, wherein the second connection assembly is rotatably connected to another end of the suspension belt.

A method of pad gas management in an underground storage volume including storing a first compressible fluid, determining a transient minimum operating pressure (P.sub.trans), measuring the pressure (P.sub.act), removing at least a portion of the first compressible fluid, concurrently, introducing an incompressible fluid, thereby producing a transient pressure condition controlled by the flow rate of the incompressible fluid, such that P.sub.trans<P.sub.act. The method may also include a length of casing, permanently cemented into the surrounding rock formations, with a final cemented casing shoe defining the practical endpoint at an approximate depth (D.sub.casing), determining a transient pressure gradient (G.sub.trans) for the underground storage volume, wherein P.sub.trans<D.sub.casingG.sub.trans. The maximum removal of the first compressible fluid is controlled such that P.sub.min<P.sub.act, and wherein the transient pressure condition has a duration (D) of less than 7 days, more preferably less than 5 days.