A pressure vessel system (21) for a motor vehicle, comprising at least two pressure vessels (19), each of which delimits an interior space (27), for filling with a fluid as fuel, a pressure sensor (32) for detecting the pressure in the pressure vessel system (21), and a computer unit (36) for determining a leak in the pressure vessel system (21) using the data detected by the pressure sensor (32), the pressure vessel system (21) comprising at least two pressure sensors for detecting the pressure of the fluid in at least two different pressure detection spaces (31) in the pressure vessel system (21), so that the pressure in each pressure detection space (31) can be detected by a pressure sensor (32) and, depending on the pressure data of the fluid in the at least two different pressure detection spaces (31) which can be detected by the at least two pressure sensors (32), a leak can be detected in the pressure vessel system (21), in particular in a pressure detection space (31).

A compressed gas storage system that includes a pressure vessel. The pressure vessel includes a first vessel portion and a second vessel portion in fluid communication with the first vessel portion. The pressure vessel includes a third vessel portion in fluid communication with the second vessel portion. The compressed gas storage system includes a first valve positioned between the first vessel portion and the second vessel portion and a second valve positioned between the second vessel portion and the third vessel portion. The first valve allows and impedes fluid flow between the first and the second vessel portions. The second valve allows and impedes fluid flow between the second and the third vessel portions.

A storage tank arrangement, optionally suitable for a vehicle, includes a storage tank for storage of volatile liquids including a tank inner wall and a tank outer wall separated by an insulating inter-wall region, inner and outer feedthrough arrangements, each configured to form a seal with a respective surface of the storage tank arrangement and to permit passage therethrough, and/or permit connection of, of one or more sensors, and a container external of the storage tank outer wall, configured to inhibit egress of the contents of the storage tank in the event of a failure of at least one of the inner and outer feedthrough arrangements. A vehicle including such a storage tank arrangement is also disclosed.

A testing system connected to a gas cylinder and includes a pressure detector, a temperature detector, and a controller. The pressure detector is configured to detect a pressure of a stored gas in the gas cylinder. The temperature detector is configured to detect a temperature of the stored gas in the gas cylinder. The controller is configured to calculate variations in the pressure and the temperature of the stored gas and to determine whether a stored state of the stored gas is present within a predetermined range according to the variances in the pressure and the temperature of the stored gas.

The invention relates to a valve for a pressurized fluid cylinder comprising a draw off circuit, a data acquisition, storage, and processing member, at least one display and a pressure sensor for measuring the pressure within the storage space of a fluid cylinder connected to the valve. When the variation of the signal representing the fluid pressure measured by the pressure sensor is greater than a specific draw off threshold, the data acquisition, storage and process member is designed to detect the drawing off of gas and, in response, to control the displaying on the display of at least one item of information concerning the draw off.

The invention relates to a valve for a pressurized fluid cylinder comprising a member for manually controlling a flow-regulating member, a sensor for detecting the position of the member for manually controlling the regulating member, a data acquisition, storage, and processing member, and a display for information relating to the fluid flow and/or pressure imposed by the regulating member and/or the valve use mode, wherein when the manual control member is disposed in an intermediate position between two respective adjacent values of the flow and/or pressure of the fluid allowed to pass from the upstream end to the downstream end, the data acquisition, storage and process member is designed to suppress the display information.

The invention relates to a pressurized fluid cylinder, a member for acquiring, storing and processing data, and at least one data display device. The valve comprises a sensor which detects the position of a manual control member, and a pressure sensor for measuring the pressure inside the storage space of a fluid cylinder. The data acquisition, storage and processing member is designed to: calculate an actual value for the amount of fluid remaining and/or drawn off; calculate a theoretical value for the amount of fluid remaining and/or drawn of on the basis of the regulation performed by the regulating member and measured by the position of the control member compare the actual value based on the measurement of the pressure sensor with the theoretical value; and generate a warning signal if the difference between these actual and theoretical values is greater than a specific safety threshold.

A method for leak monitoring a high-pressure vessel includes the following steps: (a) pumping and compressing a liquefied gas via a pump from a source of liquefied gas so as to obtain a pressure of 500 to 1000 bar, (b) vaporizing the liquefied gas, (c) compressing a tracer gas to a pressure of 500 to 1000 bar, (d) mixing the vaporized liquefied gas obtained in step (b) with the compressed tracer gas obtained in step (c) in a buffer tank, (e) filling the high-pressure vessel to be monitored with the mixture obtained in step (d), then (f) checking for tracer gas leaks on the high-pressure vessel to be monitored.

A method of detecting a leakage in a hydrogen refueling including establishing at a first and a second time a first and a second representation of at least one fluid parameter associated with hydrogen stored in at least one hydrogen storage tank of the hydrogen refuelling station, determining a relative difference between the first and second representation of the at least one fluid parameter, and comparing the relative difference with a threshold difference to detect a leakage, where a hydrogen refuelling station is provided including a hydrogen storage module comprising with a plurality of hydrogen storage tanks, a hydrogen station module having a compressor, and a dispensing module with at least one dispensing nozzle, the hydrogen refuelling station including at least one controller arranged to control the hydrogen refuelling station and arranged to detect a leakage using the beforementioned method.

A method for leak monitoring a high-pressure vessel includes the following steps: (a) pumping and compressing a liquefied gas via a pump from a source of liquefied gas so as to obtain a pressure of 500 to 1000 bar, (b) vaporizing the liquefied gas, (c) compressing a tracer gas to a pressure of 500 to 1000 bar, (d) mixing the vaporized liquefied gas obtained in step (b) with the compressed tracer gas obtained in step (c) in a buffer tank, (e) filling the high-pressure vessel to be monitored with the mixture obtained in step (d), then (f) checking for tracer gas leaks on the high-pressure vessel to be monitored.