A method of and apparatus for transferring gas. The method comprising expanding a process gas 101 having a first temperature to produce a first volume of the process gas that has a second temperature that is greater than the first temperature, and a second volume of the process gas that has a third temperature that is less than the first temperature. The method further comprises displacing at least some of the second volume of the process gas 102 into the receiving vessel using a piston gas, wherein the piston gas is of the same type as the process gas.

Gaseous fueling systems and methods are provided for dispensing fuel to a vehicle or container. The distribution systems speed up the filling process and may eliminate the use of expensive cooling systems required in the art. The methods utilize sequences of filling and emptying the vehicle gas storage tank to control the temperature of the gas inside the tank. The methods repeatedly dispense fuel to the vehicle fuel tank at a first flow rate and for a first period of time and remove fuel from the fuel tank at a second flow rate for a second period to maintain fuel temperature within a desired temperature range and until the vehicle fuel tank is filled to a desired level. In addition, the fill-up mass flowrate can be maximized to system capabilities so a fill-up can be can be completed in about one minute.

A solenoid valve diagnostic apparatus includes a plurality of solenoid valves that open or close an entrance/exit opening of a fuel tank, a current sensor that measures an operating current of the solenoid valves, and a controller that diagnoses whether the solenoid valves fail, based on the operating current measured by the current sensor.

A high pressure tank having a reinforced boss part includes: a liner; a dome formed at each end of the liner; and a boss formed at one end of the dome. The boss includes: a head including a flow path through which fuel flows into and out of the high pressure tank; and a shoulder extending in a radial direction from the head and surrounding the head. The shoulder has one or more hollow portions formed therein.

According to the described embodiments, an intelligent compressed natural gas distributing system is inserted into an existing compressed natural gas fueling station. A means to distribute compress natural gas associated with designated primary dispenser as determined by fueling situations. The system maintains a high differential of pressure during fueling as to decrease time of fueling by means of control valves on the dispenser lines. Within the system, at least one of the dispenser line is determined to be the primary active dispenser and is fueled directly from a compressor when pressure is detected under optimal threshold. The subordinate lines are subject to a bypass in which fueling is directly sourced from a high-pressure storage and receiving excess gas from the primary active dispenser.

A filter device for a gas container removes foreign substances mixed with gas in the gas container, and is integrally mounted with the gas container so as to ensure a maximum capacity of the gas container while providing a larger gas filter compared to existing external gas filters.

A Reduced Boil-off Thermal Conditioning System (RBTC System) for transferring liquid natural gas (LNG) from a LNG supply tank to a LNG storage tank with reduced boil-off is disclosed. The RBTC System includes the LNG storage tank, a cryogenic fluid tank within the LNG supply tank, and a compressor. The LNG storage tank includes a first and second LNG pipe. The cryogenic fluid tank is configured to store a cryogenic fluid within the cryogenic fluid tank and the first and second LNG pipe are in fluid communication with to the cryogenic fluid tank. The first LNG pipe is in fluid communication with compressor.

Method of operating a hydrogen dispensing where pressure relief is provided through block and bleed valves. After dispensing hydrogen from a dispensing station where the hydrogen is cooled during dispensing, trapped hydrogen remains in the transfer lines. During the idle time between refueling vehicles, the temperature of the trapped hydrogen increases resulting in an increase in the pressure of the trapped hydrogen. Block and bleed valves operate to relieve the pressure in the transfer lines.

A system for powering a vehicle is provided. The system can include an engine or power generation system to be powered by a fuel and a housing. The housing can be configured to couple to one or more frame rails of the vehicle, receive and protect a cylinder configured to store the fuel to be used by the engine or power generation system. The housing can have one or more access panels allowing access to an interior of the housing. The cylinder can include a first end portion, a second end portion, a central body forming an enclosed cavity for storing pressurized gas, a reinforcement structure disposed over the central body, and a metal foil interposed between the reinforcement structure and central body. The metal foil can be configured to reduce permeation of contents of the cylinder.

In processes and systems utilizing a compressor to fill a vessel with gas, for example, in the filling of the fuel tank of a vehicle that operates on compressed natural gas (CNG), a number of advantages are realized by establishing independent control over the flow rate of gas discharged from the compressor, such as on the basis of the compressor discharge pressure, utilizing feedback from one or more gas pressure sensors. In representative embodiments, a detected or actual measured compressor discharge pressure can serve as a process variable, in a feedback control loop for regulating the output of the compressor.