A hydrogen gas filling method includes: a step for acquiring a pre-supply upstream pressure that is a pressure in a station side of a piping at time t0, a step for starting the supply of hydrogen gas from the station at time t1 that is after the pre-supply upstream pressure is acquired, a step for acquiring a post-supply upstream pressure at time t2 that is immediate after the supply of hydrogen gas starts, a step for acquiring a start-time flowrate that is a flowrate of hydrogen gas at the same period as the step for starting, a step for estimating the pressure loss generated in the piping at the time of the supply by using the pre-supply upstream pressure, post-supply upstream pressure, and the start-time flowrate, and a step for stopping the supply of hydrogen gas so that a tank pressure conforms with a predetermined target pressure.

A compressed natural gas (CNG) refueling station system includes a station storage container configured to receive gas at a first pressure, a dispenser configured to deliver CNG to a vehicle tank up to a second pressure below the first pressure, and a pressure regulator disposed between the station storage container and the dispenser.

The subject matter described herein relates to a method for filling fluid containers, in particular fluid containers for fuel cells The method includes: providing a pressure chamber having a pressure chamber interior; positioning a fluid container within the pressure chamber interior in such a manner that a holding space of the fluid container is fluidically connected to the pressure chamber interior; evacuating the pressure chamber interior up to a target negative pressure in such a manner that, due to the fluid coupling, a negative pressure difference initially forms in the pressure chamber interior with respect to the holding space; and filling the fluid container by introducing a fluid into the holding space.