Abstract: An apparatus and process for dispensing a cryogenic fluid can include an apparatus and process configured for dispensing the cryogenic fluid into a fuel tank. Embodiments can be configured for dispensing of liquid hydrogen into fuel tanks of vehicles, for example. Embodiments can be provided so no pump usage is necessary for filing the fuel tank or substantially filling the fuel tank (e.g., filling the fuel tank to a level of 90% filled or a level of 95% filled, etc.) during the dispensing. This can permit embodiments to avoid cryogenic boil off and fugitive emission losses as well as reducing power consumption, reducing maintenance costs, and permitting dispensing start-up to occur more quickly.

Abstract: A leak test apparatus for leak testing a tank including a gas supply system configured to provide to the tank a leak detection gas mixture including hydrogen, a test chamber having a cavity for sealably enclosing the tank such that dead space exists outside the tank and within the cavity, and a gas conduit configured to interconnect the gas supply system and the tank, a control system including a controller programmed to pressurize the tank with the leak detection mixture by flowing gas from the gas supply system through the gas conduit, and a leak detector to determine the presence or absence of a leak in the tank by measuring a concentration of hydrogen in the dead space.