The invention relates to a method for a communication between a fueling device (2) and a vehicle (4), having the steps of coupling the fueling device to a tank (6) of the vehicle by means of a fuel hose (10), providing pressurized fuel to the fuel hose, varying the pressure on the fuel hose by superimposing a specified base pressure with a pressure sequence in order to modulate a first signal to be transmitted, detecting the pressure being applied to the fuel hose by means of the vehicle, and extracting the first signal to be transmitted from the detected pressure.

The invention relates to a method and a device for transferring liquefied cryogenic fluid, for example liquid hydrogen, from a cryogenic tank containing liquefied cryogenic fluid having a gas phase in equilibrium with the liquid phase, the transfer of fluid to a receiver being realized at least in part by way of a pressure difference between the cryogenic tank and the fluid receiver, the method comprising a step of pressurizing the fluid contained in the cryogenic tank, a step of withdrawing liquid from the pressurized cryogenic tank, a step of measuring the volume flow rate of withdrawn fluid, a step of determining the mass of withdrawn liquid from the measured volume flow rate of withdrawn fluid and the density of the withdrawn fluid, the density of the withdrawn fluid being determined from the pressure of the fluid in the cryogenic tank measured before the pressurization step.

A hydrogen gas inventory acquisition system configured to acquire an inventory of a hydrogen gas in a plurality of off-site hydrogen stations, includes a log data creation device configured to create log data obtained by recording each parameter data sampled at an individual sampling timing set to each hydrogen station of the plurality of off-site hydrogen stations in combination with identification information of each of the plurality of off-site hydrogen stations from a plurality of parameter data measured by a plurality of meters disposed in the each hydrogen station to calculate an inventory of the hydrogen gas in the each hydrogen station; an inventory calculation device configured to calculate the inventory of the hydrogen gas at an individual calculation timing set to the each hydrogen station by using the log data; and a sorting device configured to acquire inventory data of the hydrogen gas in the each hydrogen station.

A management apparatus for managing an inventory amount of a hydrogen gas in a plurality of hydrogen tanks that store hydrogen gas, the management apparatus including a log data receiving circuit configured to receive log data including a plurality of parameter data measured by a plurality of instruments arranged each on hydrogen tank and identification information of each hydrogen tank, and an inventory amount calculation circuit configured to calculate an inventory amount of the hydrogen gas at an individual calculation timing that is individually set for each hydrogen tank based on the log data.