Abstract: A gas storage container may be filled with gas under pressure by feeding cryogenic fluid comprising liquefied gas into the container through a first conduit arrangement in a nozzle inserted into a passageway through a fluid flow control unit mounted in an opening in said container; closing the container to the passage of gas into or out of said container; and allowing said cryogenic fluid to become gaseous within the closed container. The invention involves venting displaced air and/or gaseous cryogenic fluid from said container during the feeding step through a second conduit arrangement in the nozzle. In embodiments in which displaced air and/or gaseous cryogenic fluid flows through the second conduit arrangement around a length of the first conduit arrangement, heat transfer from the fluid flow control unit to said cryogenic fluid is suppressed thereby reducing the level of evaporation of the cryogenic fluid in the nozzle during fill.

Abstract: At least one inner vessel is provided within a container for storing and/or dispensing gas under pressure to assist in filling the container with gas. The container comprises an outer vessel defining an interior space and a fluid flow control unit for controlling fluid flow into and out of the container. The inner vessel(s) defines a part of the interior space of container and is intended to hold cryogenic fluid in spaced relationship with respect to the outer vessel. Since the inner vessel is in fluid flow communication with the remaining part of the interior space, when the cryogenic fluid becomes gaseous, the container fills with gas. The inner vessel(s) has a mouth for receiving cryogenic fluid from the fluid flow control unit which is free of the fluid flow control unit.

Abstract: A gas storage container, such as a gas cylinder, is filled with a gas mixture comprising a first gas and a second gas under pressure by feeding a liquid/solid mixture comprising liquefied first gas and solidified second gas into the gas storage container; closing the gas storage container to the passage of gas into or out from the container; and allowing said liquefied first gas and said solidified second gas to become gaseous within said closed gas storage container. Such a process is easier and more energy efficient as compared to direct compression processes, and is safer and results in less wastage as compared to direct liquid injection processes.