A method for extracting a liquid phase of a cryogen comprising the liquid phase and a vapour phase from an interior volume of a storage dewar through an extraction means, utilizing a push gas introduced into the vapour phase of the cryogen through an outlet of a supply line provided between a push gas supply and the interior volume of the storage dewar, the supply line partially extending through the liquid phase within the interior volume.

A system and method for the transfer of cryogenic fluid fuel includes a nozzle positionable with respect to fuel tank inlet, e.g., of an unmanned aerial vehicle (UAV), a seal to seal the area where the nozzle and inlet are connected, a collapsible and expandable bellows providing an isolation volume where the fluid is transferred from the nozzle into the inlet; a vacuum is provided in the volume to avoid accumulation of fuel or other species in the volume.

A small scale natural gas liquefaction plant is integrated with an LNG loading facility in which natural gas is liquefied using a multi-stage gas expansion cycle. LNG is then loaded onto an LNG truck or other LNG transport vehicle at the loading facility using a differential pressure control system that uses compressed boil off gas as a motive force to move the LNG from the LNG storage tank to the LNG truck so as to avoid the use of an LNG pump and associated equipment as well as to avoid venting of boil off vapors into the environment.

Method for filling a liquefied gas tank with pressurized liquefied gas from a source of liquefied gas using a filling apparatus comprising a transfer circuit that is provided with first and second pipes, each connecting between the source via respective first ends and the tank via respective second ends, third and fourth pipes each connecting between the first and second pipes, and a set of valves controlling flows of fluid in the pipes. The tank is depressurized and at least part of the circuit is cooled by transferring pressurized vaporization gas from the tank to the first end of the second pipes via the second end of the second pipe, the third pipe, the first pipe, and the fourth pipe.

A system for preparing subcooled liquid oxygen based on mixing of liquid oxygen and liquid nitrogen and then vacuum-pumping, including atmospheric-pressure saturated liquid nitrogen and oxygen tanks. An inlet of the liquid nitrogen tank communicates with pressurized gas, and an outlet is connected to an inlet a of a secondary subcooler. An inlet of the liquid oxygen tank communicates with the pressurized gas, and a first outlet is connected to an inlet b of the secondary subcooler. An outlet c of the secondary subcooler is connected to an inlet d of a primary subcooler. An outlet e of the primary subcooler is connected to a pumping-out device through a rewarming device. A second outlet of the liquid oxygen tank is connected to an inlet n of the primary subcooler. An outlet o of the primary subcooler is connected to an inlet r of the secondary subcooler.

A transport refrigeration system (200) comprising: a vehicle (102) having a refrigerated cargo space (119); a refrigeration unit (22) in operative association with the refrigerated cargo space, the refrigeration unit providing conditioned air to the refrigerated cargo space; a first engine (26) configured to power the refrigeration unit; a plurality of first fuel tanks (330) fluidly connected to the first engine, the plurality of first fuel tanks configured to supply fuel to the first engine, wherein each of the plurality of first fuel tanks includes a lock off valve (450) and a pressure sensor (470) configured to detect a pressure level within each of the first fuel tanks; and one or more engine controllers (54) in electronic communication with each pressure sensor and lock off valve, the one or more engine controllers being configured to adjust at least one of the lock off valves in response to a pressure level detected by at least one of the pressure sensors.

A method for subcooling liquid cryogen that is used by a cutting tool uses the steps of dividing liquid phase cryogen between a subcooler feed line and tool feed line. The cryogen in the subcooler feed line is expanded to lower the pressure and decrease the temperature of the cryogen, and the expanded liquid cryogen from the subcooler feed line is added to the interior of a subcooler. A heat exchanger is positioned in the subcooler in contact with the expanded liquid cryogen. The cryogen in the tool feed line is subcooled below its saturation temperature by passing the cryogen through the heat exchanger, and the subcooled cryogen from the heat exchanger is supplied to the cutting tool. As a result, the subcooled cryogen supplied to the cutting tool is substantially 100% liquid cryogen without any vapor content.

A body structure has an inlet port that receives fluid, a first outlet port that connects to a top-fill line of a cryogenic tank, a second outlet port that connects to a bottom-fill line of a cryogenic tank and a slider tube cylinder. A cylinder housing connects to the body structure and has a pressure comparison cylinder with upper and lower volumes, with the latter in fluid communication with a cryogenic tank. A piston having a piston shaft slides within the pressure comparison cylinder. A pressure regulator is in fluid communication with the upper volume and the slider tube cylinder. A slider tube is connected to the piston shaft and slides within the slider tube cylinder. The slider tube cylinder selectively directs fluid to a top-fill line through the first outlet port or to a bottom-fill line through the second outlet port.

An improved system and method for the automated refilling of cryogenic helium is provided. In one embodiment, the system includes a dewar in fluid communication with a liquid helium cryostat through a cryogen transfer line. A controller regulates operation of a three-way valve to pre-cool the transfer line and to cause gaseous helium to flow to the dewar and force liquid helium through the transfer line into the cryostat. The controller is coupled to the output of a cryogenic level sensor, such that the controller regulates the helium liquid level within the cryostat. During filling cycles, the dewar liquid level is also monitored by the cryogenic level sensor and an alarm sounds if the dewar liquid level is undesirably low. Between filling cycles, the controller is operable to ventilate the dewar through a solenoid vent valve in fixed time intervals to ensure the dewar pressure is sufficiently low so as to not bleed liquid helium into the cryostat.

Provided is a liquefied gas transfer device for reducing boil-off gas. The liquefied gas transfer device for reducing boil-off gas comprises: at least one transfer pipe formed in a vertical direction inside a quay for storing liquefied gas so as to transfer the liquefied gas; a branch pipe which is branched from a lower part of the transfer pipe to one side of the transfer pipe, and which has an end part opened toward a bottom surface of the quay; a valve which is connected to the branch pipe and/or the transfer pipe, and which opens and closes the branch pipe or the transfer pipe so as to move the liquefied gas from the transfer pipe to the branch pipe; and a resistance member disposed inside the branch pipe so as to interrupt the flow of the liquefied gas.