A small scale natural gas liquefaction plant is integrated with an LNG loading facility in which natural gas is liquefied using a multi-stage gas expansion cycle. LNG is then loaded onto an LNG truck or other LNG transport vehicle at the loading facility using a differential pressure control system that uses compressed boil off gas as a motive force to move the LNG from the LNG storage tank to the LNG truck so as to avoid the use of an LNG pump and associated equipment as well as to avoid venting of boil off vapors into the environment.

The invention relates to a system for checking the function and releasing the excess pressure of a cryogenic container on a vehicle roof, the system comprising a vehicle and the cryogenic container which is mounted on the vehicle roof and has an interior volume for receiving cryogenic fluid, wherein the system furthermore comprises a pressure line which is connected to the interior volume of the cryogenic container and is led from the cryogenic container on the vehicle roof to an accessible point on the vehicle side or in the vehicle interior and opens into a pressure gauge there, wherein a valve and a predetermined breaking point are arranged in the pressure line and the valve is arranged between the predetermined breaking point and the interior volume of the cryogenic container and opens at a predetermined first pressure which is greater than a second pressure at which the predetermined breaking point breaks.

Intelligent temperature and pressure gauge assemblies (52) for use with vessels (24) having pressurized hazard suppression materials therein include temperature and pressure sensors (136, 138) coupled with a digital processor (72) with associated memory for storing empirical temperature and pressure data. The data includes normalized linear temperature-pressure curves consistent with static or slowly changing temperature conditions experienced by the vessels (24), as well as nonlinear temperature-pressure curves consistent with rapidly changing temperature conditions. In use, the assemblies (52) repeatedly sense the temperature and pressure conditions of the hazard suppression material and compare these sensed values with the stored values, and generate an output in conformance with the comparison. In this fashion, the assemblies (52) compensate for rapidly changing temperatures without generating false failure signals.

A system and device for monitoring the content of a gas/liquid or gas only containment vessel such as a cylinder is provided. The disclosed apparatus is easily affixed to a standard gas cylinder and configured to monitor the pressure of the cylinder contents and activate a visual and/or audio alarm when the contents of the gas/liquid cylinder are no longer in a liquid or partially liquid state as well as activate another visual and/or audio alarm at a prescribed pressure when the contents of the cylinder are nearing depletion.

A valve arrangement (10) adapted to be coupled to, and to provide a gas flow from, a gas cylinder (20) containing a pressurized gas (21), the valve arrangement (10) comprising a blocking valve (1) with an obturator (11) movable by an actuator (12) from an opening position permitting a flow of the pressurized gas (21) through the blocking valve (1) into a closing position blocking the flow of the pressurized gas (21) through the blocking valve (1) is provided. Temperature sensing means (4) are provided which are adapted to provide at least one signal, the at least one signal being indicative of one or more temperatures of, in, and/or in vicinity to, the valve arrangement (10), and the actuator (12) is adapted to move the obturator (11) from the opening position into the closing position if the one or more temperatures indicated by the at least one signal are above a predetermined threshold value. A gas supply system (100) and a corresponding method of gas supply is also part of the invention.

Providing a fast response to a process step while allowing a sensor response to remain relatively slow. A mechanical component generates a response to a step change in a physical property and an electrical component generates an analog electrical signal indicative of the response generated by the mechanical component over a period of time. The analog electrical signal is converted into digital values and the digital values are used to indicate the final value of the step change in the physical property before the period of time has elapsed.

An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a compressor.

Embodiments include a method for replacing air with an interpane gas during manufacture of a sealed insulating glass unit (IGU). The method includes forming an unsealed IGU assembly defining an IGU passage for fluid communication between an interpane space and an ambient environment; positioning the unsealed IGU assembly within an enclosure and sealing the enclosure around the unsealed IGU assembly; evacuating air from the enclosure; introducing a first gas into the interpane space through the IGU passage; introducing a second gas into the enclosure, wherein the second gas has a different composition than the first gas; and closing the IGU passage to seal the interpane space. Other embodiments are also included herein.

A device for filling a tank or tanks with pressurized gas comprising a circuit comprising a plurality of upstream ends connected respectively to separate pressurized gas sources, at least one compressor, at least one buffer storage, a set of controlled valves and at least one downstream end intended to be connected to the tank(s) to be filled, the device further comprising an electronic control member configured to control the valves and/or the compressor in order to ensure a transfer of gas into the tank from at least one source and/or at least one buffer storage and/or via the compressor, the device comprising a set of sensors for measuring the pressure in the sources and the buffer storages, the control member comprising member for receiving or generating signal representative of the filling demand from a relatively high demand to a relatively low demand, the control member being configured to ensure the transfer of gas into the tank according to at least a first transfer mode using the source having the highest pressure and a second transfer mode using a source having a pressure lower than this highest pressure in response, respectively, to a relatively high or low filling demand.

A method of dispensing compressed natural gas (CNG) includes assigning a first priority to the filling of a first destination tank and assigning a second priority to the filling of a second destination tank. The second priority is lower than the first priority. The method also includes filling the first destination tank from a first CNG source while filling the second destination tank from a second CNG source. The second CNG source provides CNG at a lower pressure relative to the pressure at which the first CNG source provides CNG.