A device for taking a sample of gas, including a base supporting a fluid circuit, a sampling tank and a first pipe connecting the inlet connector to an inlet of the sampling tank, the first pipe having a set of valves for controlling the circulation of the gas, the circuit having an evacuation line with a control valve and includes a downstream end that opens into the atmosphere, the circuit has a second pipe and includes an analysis line having an upstream end connected to the first pipe and a downstream end provided with an analysis outlet intended to be connected to an analysis apparatus, the analysis line having at least one control valve, and wherein the outlet of one housing is connected directly to the inlet of the adjacent housing.

A bayonet coupling system includes a bayonet, a bayonet coupler, and a seal. The bayonet includes a bayonet tube configured to enable the flow of hydrogen fuel therethrough, and a flange coupled to the bayonet tube. The seal is configured to surround the bayonet tube and contact the flange along one side of the flange. The bayonet coupler includes a bayonet coupler tube having an inside diameter larger than an outside diameter of the bayonet tube, the bayonet coupler tube configured to receive the bayonet tube and to seal against the flange at the seal. The bayonet coupler is fixedly mounted directly or indirectly to a hydrogen storage tank such that a longitudinal axis of the bayonet coupler is inclined a predetermined angle with respect to horizontal to prevent a substantial thermal gradient from forming at the seal.

The present disclosure discloses a method for simulating performance of an LNG ambient air vaporizer under a frosting condition, performing site operation test on the LNG ambient air vaporizer to obtain fitting relationship between the outer wall temperature of frosted finned tube and frost layer; transforming a sum of increased frost layer thermal resistance and thermal resistance into equivalent thermal contact resistance, and representing the equivalent thermal contact resistance as a function of the outer wall temperature; establishing a calculation model of the LNG ambient air vaporizer, performing simulation calculation by equivalent heat conduction coefficient, so as to obtain fluid-solid conjugate heat transfer characteristics and vaporization performance of the LNG ambient air vaporizer under the frosting condition. The influences of heat transfer in gas-liquid phase change flow and fluid-solid conjugate heat transfer in the tubes of the vaporizer under the frosting condition are considered in the present disclosure.

Approaches for predicting or detecting hydrogen leakage in a hydrogen amenity, are described. According to one example, a hydrogen leakage detection unit may be provided. The hydrogen leakage detection unit may receive sensor data for a section of hydrogen amenity from a sensor unit installed proximate to the section. The sensor data may include at least one of a concentration level of hydrogen within the section, a concentration level of metal particles in the hydrogen, a temperature value of the hydrogen, a pressure value of the hydrogen, a humidity value around the section, a deviation level of electrochemical liquid within the sensor unit, and an image of the section. The sensor data may be processed to ascertain occurrence of existing hydrogen leakage or probable hydrogen leakage at the section. One or more preventive actions may be initiated upon ascertaining the occurrence of existing hydrogen leakage or probable hydrogen leakage.

An underground storage system for storing fluid includes a hole having a bottom, a support element including at least one opening able to receive a joining element, at least one reservoir having a longitudinal axis, a bottom end and a top end, a first closure able to close the reservoir at its bottom end, and a second closure able to close the reservoir at its top end. The top end is able to be joined to the support element via the joining element such that the reservoir is hung inside the hole and such that an axial clearance able to absorb axial thermal expansion of the reservoir remains between the first closure and the bottom.