The disclosure provides a gas filling method. The gas filling method includes the following steps: an effective heat mass calculation step, which uses the heat capacity of the piping and the detection value of the gas temperature sensor to calculate the value of the effective heat mass related to the temporary pressure loss caused by the piping before gas-filling is started; a pressure loss parameter calculation step, which uses the detection value of the pressure sensor when the flow rate of the gas in the piping changes to calculate the value of the pressure loss parameter related to the pressure loss caused by the piping after the gas-filling is started; and a filling condition changing step, which changes the filling condition into a condition that is defined based on the value of the pressure loss parameter and gas-filling is continued.

It is object of the invention to reduce the technical expenditure for refilling of gas bottles. For solving the problem, a claimed fitting comprises a gas tap for gas withdrawal and an opening for refilling a liquid gas bottle. The opening for refilling a liquid gas bottle can be connected, in particular by opening a valve, in a gas-conducting manner to a hose-shaped or tubular line of the fitting, which can extent into a liquid gas bottle by at least 300 mm, preferably at least 400 mm, if the fitting is connected with such a gas bottle. Hereby, it can achieved that the line extents into the liquefied part of the gas, which especially enables a very fast emptying though pumping. Emptying is necessary when a refilled gas bottle proves to be untight. A speed advantage is thereby achieved. Basically, there is an opening at the bottom side of the fitting adjacent to the hose-shaped or tubular line. The bottom side is the side, which adjoins the liquid gas bottle or respectively is arranged entirely in the bottle or in a bottle neck when the fitting is connected to a liquid gas bottle. This opening at the bottom side can be connected to the gas tap in a gas-conducting manner, specifically typically by rotating a corresponding rotary handle. The hose-shaped or tubular line protrudes relative to the opening, specifically in particular by at least by 200 mm, particularly preferred by at least 300 mm. A method concerns the refilling of a liquid gas bottle comprising the claimed fitting.

Method for filling a liquefied gas tank with pressurized liquefied gas from a source of liquefied gas using a filling apparatus comprising a transfer circuit that is provided with first and second pipes, each connecting between the source via respective first ends and the tank via respective second ends, third and fourth pipes each connecting between the first and second pipes, and a set of valves controlling flows of fluid in the pipes. The tank is depressurized and at least part of the circuit is cooled by transferring pressurized vaporization gas from the tank to the first end of the second pipes via the second end of the second pipe, the third pipe, the first pipe, and the fourth pipe.

In a system and a method for pressure management while extracting a liquid from a liquid storage vessel, a liquid and its vapor are provided in liquid storage vessel. The liquid is extracted by a pump from the storage vessel and fed as a liquid flow to a consumer unit. A defined partial flow is separated from the liquid flow downstream of the pump. The pressure of the partial flow is reduced by a pressure regulation means and the partial flow is evaporated by an evaporator. The evaporated partial flow is fed back into the storage vessel.

A hydrogen filling method for a fuel cell vehicle includes filling a hydrogen tank of the fuel cell vehicle with hydrogen using a hydrogen dispenser by sequentially using a low-pressure storage tank of the fuel cell vehicle, a medium-pressure storage tank of the fuel cell vehicle, and a high-pressure storage tank of the fuel cell vehicle.

A transport refrigeration system (200) comprising: a vehicle (102) having a refrigerated cargo space (119); a refrigeration unit (22) in operative association with the refrigerated cargo space, the refrigeration unit providing conditioned air to the refrigerated cargo space; a first engine (26) configured to power the refrigeration unit; a plurality of first fuel tanks (330) fluidly connected to the first engine, the plurality of first fuel tanks configured to supply fuel to the first engine, wherein each of the plurality of first fuel tanks includes a lock off valve (450) and a pressure sensor (470) configured to detect a pressure level within each of the first fuel tanks; and one or more engine controllers (54) in electronic communication with each pressure sensor and lock off valve, the one or more engine controllers being configured to adjust at least one of the lock off valves in response to a pressure level detected by at least one of the pressure sensors.

A body structure has an inlet port that receives fluid, a first outlet port that connects to a top-fill line of a cryogenic tank, a second outlet port that connects to a bottom-fill line of a cryogenic tank and a slider tube cylinder. A cylinder housing connects to the body structure and has a pressure comparison cylinder with upper and lower volumes, with the latter in fluid communication with a cryogenic tank. A piston having a piston shaft slides within the pressure comparison cylinder. A pressure regulator is in fluid communication with the upper volume and the slider tube cylinder. A slider tube is connected to the piston shaft and slides within the slider tube cylinder. The slider tube cylinder selectively directs fluid to a top-fill line through the first outlet port or to a bottom-fill line through the second outlet port.

A mobile compressed natural gas (CNG) vessel and unloader are used to supply CNG to a compressor during regulatory emissions testing of the compressor (e.g., U.S. EPA's Quad J testing). CNG output by the compressor is recirculated to an inlet of the unloader so that it is reused during the emissions testing. Lean CNG from the vessel may be used to power the compressor during the testing. The unloader ensures that the compressor is run at at least a predetermined load factor during the emissions testing.

Method of liquefaction of methane and filling a tank (2) with liquefied methane, said method comprising: a step of liquefaction of the methane comprising an operation of cooling the methane to its saturation temperature, a step of filling the tank with the liquefied methane, a step of reinjection of the vaporized methane into the liquefaction system.

A cryogenic fluid delivery system includes a main tank system with a main tank adapted to contain a first supply of cryogenic liquid, and reserve tank system with reserve tank adapted to contain a second supply of cryogenic liquid. A pressure building circuit is adapted to delivery vapor to the head space of the main tank to build pressure in the main tank and a fuel delivery line supplies cryogenic fuel from either the main tank or the reserve tank to a use device. The reserve tank stores saturated cryogenic fuel that is delivered to the use device via the fuel delivery line while the cryogenic liquid in the main tank is being saturated. The fluid delivery system automatically switches to delivering cryogenic fuel from the main tank to the use device via the fuel delivery line upon saturation of the cryogenic liquid in the main tank.