A cryogenic pump for pumping liquefied natural gas (LNG) from a cryogenic tank storing LNG includes a drive assembly and a pump assembly disposed along a pump axis. The drive assembly includes a spool housing having a plurality of spool valves arranged around the pump axis, a tappet housing having a plurality of tappet bores with slidable tappets arranged around the pump axis, and spring housing including a plurality of movably disposed pushrods urged upward by a plurality of associated pushrod springs. Hydraulic fluid received by a hydraulic fluid inlet in the drive assembly is directed by the spool valves to the tappet bores to move the tappets downward against the pushrods. To collect the hydraulic fluid, the lowermost spring housing also includes a collection cavity formed therein that can return the hydraulic fluid to a hydraulic fluid outlet.

A pump for pumping a cryogenic fluid includes an activation portion that includes at least one actuator. The activation portion contains oil that may be cooled by the cryogenic fluid. The pump further includes a pumping portion that includes at least one pumping element, the at least one pumping element being operated by the at least one actuator, and a heater associated with the activation portion and configured to, when the heater is active, transfer heat energy to the activation portion such that the oil contained in the activation portion is warmed.

A cryogenic pump is disclosed as having a plunger housing with a plurality of barrels formed in a ring around a central axis, and a plurality of plungers. Each of the plurality of plungers may be reciprocatingly disposed within a different one of the plurality of barrels. The cryogenic pump may also include an inlet manifold connected to the plunger housing and having a plurality of bores. Each of the plurality of bores may be open to a corresponding one of the plurality of barrels. The cryogenic pump may also have at least one orifice in fluid communication with each of the plurality of bores, and an inlet check valve disposed between each of the plurality of bores and the at least one orifice. The inlet check valve may be movable to selectively allow flow between the at least one orifice and a corresponding one of the plurality of barrels.

Membrane tank for containment of fluids at temperature that can differ significantly from ambient temperature, for example for containing a cryogenic fluid, wherein the membrane tank comprises, in direction from an inner containment volume: a primary membrane that is fluid tight, facing the contained fluid in operation and functioning as the primary fluid barrier, an insulation layer, surrounding the membrane on the outside, an outer structure, such as a ship hull or bulkhead or other structure, wherein the outer structure supports the insulation layer and primary membrane inside and carries the resulting forces thereby, and at least one opening for loading and unloading of fluid, and an optional secondary membrane if the outer structure is a steel structure becoming brittle at cryogenic temperature, such as a ship hull outer structure, the secondary membrane dividing the insulation layer into an inner insulation between the primary and secondary membranes and an outer insulation between the secondary membrane and the outer structure, wherein the primary membrane comprises areas of flat, curved or double curved shape and a corrugation in between said areas, wherein said areas are fastened to the underlaying insulation and the corrugations are taking up thermally induced strain. The membrane tank is distinguished in that it further comprises a coupling part for connecting a vacuum pump operatively to the whole insulation layer or the inner insulation layer, for enabling vacuum in the whole insulation layer or the inner insulation layer, during loading, containment and unloading of cryogenic fluid.

A system and a method are disclosed for zero vent loss operation of a liquefied gas application, whereby a transfer pump is used to deliver, through nozzles, controlled size liquid droplets to recondense the vapor in the headspace of a storage tank, thereby reducing the tank pressure and preventing vent loss from either the source tank or the receiving customer tank. The fill process can be automated to use a combination of top fill and bottom fill to achieve a desired receiving tank pressure to ensure long dormancy and minimum or no safety venting. The method and system can apply to liquid hydrogen and other liquefied gases.

The present invention provides a two stage cryogen cooling system for particular use in cooling a cryogen employed in a superconducting power transmission cable, the cooling system employing a sub-cooler pump such as a venturi pump to effect both cooling stages, the first cooling stage being the cooling of the liquid cryogen flowing through an inner lumen of a cryostat of the cooling system and the second stage being the generation of a supply of gaseous cryogen for supply to a second lumen of the cryostat surrounding the inner lumen.

A method of storing ethane includes storing ethane in a number of storage pipes as a liquid at ambient temperature conditions. The storage pipes may be provided on a tanker.

A process for transferring hydrogen from a first tank wherein the hydrogen is in an initial liquid state at a pressure of the order of 10 bar to a second tank wherein the hydrogen is in a final state at a pressure greater than or equal to 500 bar. The process includes: a first pumping step of the hydrogen from the initial state thereof to an intermediate state wherein the hydrogen has a pressure greater than that of the initial state thereof; and a second pumping step of the hydrogen from the intermediate state thereof to bring it to the final state thereof. The first pumping step and the second pumping step are carried out respectively by mutually separate first compression and second compression elements.

A model-based fault detection device for a liquid hydrogen refueling system using a cumulative sum method includes a memory that stores instructions, and a processor configured to, by executing the instructions, obtain process variables inside a liquid hydrogen storage system based on a simulation model for the liquid hydrogen storage system, obtain normal scenario data and fault scenario data of the process variables by using a steady-state model and a dynamic state model for the liquid hydrogen storage system, calculate an upper end cumulative sum index C.sub.i.sup.+ and a lower end cumulative sum index C.sub.i.sup. by applying a cumulative sum (CUSUM) control method to deviation data corresponding to a difference between the normal scenario data and the fault scenario data, and detect whether the liquid hydrogen storage system is faulty by comparing the upper end cumulative sum index C.sub.i.sup.+ and the lower end cumulative sum index .sub.C.sup. i with a threshold.

A cryogen storage vessel at an installation is filled with liquid cryogen from a liquid cryogen storage tank that has a pressure lower than that of the vessel. After headspaces of the vessel and tank are placed in fluid communication with another via a gas transfer vessel and are pressure-balanced, a pump in a liquid transfer line connected between the tank and the vessel is operated to transfer amounts of liquid cryogen from the tank to the vessel via the liquid transfer line and pump as amounts of gaseous cryogen are transferred, through displacement by the pumped cryogenic liquid, from the vessel to the tank.