A pigtail hose is described for connecting a gas canister to a gas regulator. The pigtail hose includes a gas hose having an inlet end and an outlet end; and an elbow fitting connected to the inlet end of the gas hose. The elbow fitting has a bore which turns the gas supply through 90° at a convenient point of the gas supply assembly to assist with the connection of the canister in a confined storage space.

A filling apparatus that does not significantly reduce a required pressure immediately after a start of hydrogen filling, and can reliably fill fuel cell vehicles and the like. The filling apparatus (100) includes a control unit (10), and the control unit (10) has a function of boosting pressure required from a hydrogen filling apparatus (100) to a rear facility (200) until initial pressure measurement is completed. The control unit (10) may have a function of determining whether or not communication filling is established, and when communication filling is established, setting a pressure higher than an internal pressure of a tank received from a vehicle side by a predetermined pressure (for example, 5 MPa) as a pressure required for the rear facility (200) at an initial stage of filling.

A computer-controlled method of automatically purging and precooling a hydrogen fuel line prior to transferring hydrogen fuel from a source to a storage tank includes purging moisture from a hydrogen fuel line. The hydrogen fuel line is configured to fluidically couple a hydrogen tanker storage tank and a fueling station storage tank, the hydrogen storage tanker storage tank and the fueling station storage tank configured to store liquid hydrogen. The method also includes pre-cooling the hydrogen fuel line, causing hydrogen fuel to flow through the hydrogen fuel line to re-fill the fueling station storage tank, and expelling residual hydrogen fuel from the hydrogen fuel line when the fueling station storage tank re-filling is complete.

Portable natural gas distribution systems for dual fuel fleets such as hydraulic fracturing fleets are described.

Disclosed is a gas injection apparatus which measures and displays a gas amount supplied to a radiosonde instrument.

The gas injection apparatus includes: a body which includes an inlet port through which the gas is introduced from the storage tank, a flow passage through which the gas introduced from the inlet port flows, and an outlet port through which the gas passing through the flow passage is discharged; a valve which opens/closes the flow passage, and a flow meter which is installed in the body and is configured to measure and display the flow rate of the gas supplied to the instrument.

Disclosed is a gas injection apparatus which measures and displays a gas amount supplied to a radiosonde instrument. The gas injection apparatus includes: a body which includes an inlet port through which the gas is introduced from the storage tank, a flow passage through which the gas introduced from the inlet port flows, and an outlet port through which the gas passing through the flow passage is discharged; a valve which opens/closes the flow passage, and a flow meter which is installed in the body and is configured to measure and display the flow rate of the gas supplied to the instrument.

A fluid drain system for pressurized fuel systems includes a fluid drain tool that includes: an enclosure including a collection cavity; a fitting configured for removable coupling to a fluid filter drain valve to fluidly couple the fluid drain tool to the fluid filter drain valve; a tube that fluidly couples the fitting to the enclosure, such that fluid collected from the fluid filter drain valve can be transferred through the tube to the collection cavity of the enclosure; and a selectively openable valve having a first end in fluid communication with the collection cavity of the enclosure, and a second end in fluid communication with an atmosphere.

A multiply-redundant system that prevents a driver from starting and/or moving a vehicle if a compressed natural gas fill system is not correctly and completely disconnected from the vehicle. One or more sensors in combination with one or more optional microswitches combine to lock-out the vehicle's ignition or otherwise prevent it from starting and/or moving. For different levels of safety, different combinations of sensors can be used with the lowest level having a single proximity sensor sensing the presence or absence of a high-pressure fill hose. The highest level of safety being achieved by having separate proximity sensors on the fuel fill hose fitting, the gas cap cover and a manual safety valve along with a redundant microswitch. An optional override that may be restricted as to the number of times it can be used can allow starting with a faulty sensor in order to allow maintenance.

A suction method that sucks inside of a filling nozzle used for supply of hydrogen by using a suction nozzle that is engaged with the filling nozzle, the suction method comprising: evacuating a vacuum chamber by using a vacuum pump; and sucking inside of the suction nozzle by using the evacuated vacuum chamber.

A fueling station can include an outer housing comprising a housing volume, a first fluid bladder positioned within the housing volume and configured to hold a first fluid, a second fluid bladder positioned within the housing volume and configured to hold a second fluid, a first fluid conduit in fluid communication with the first fluid bladder, a second fluid conduit in fluid communication with the second bladder, a first hose positioned at least partially outside the outer housing and in fluid communication with both the first and second fluid conduits, and a bi-directional first nozzle connected to an end of the first hose opposite the first and second fluid conduits. The bi-directional first nozzle can be configured to simultaneously release fluid from the first hose and to collect fluid into the first hose. The first fluid bladder can be configured to release fluid through the first conduit in response to introduction of fluid into the second fluid bladder via the second conduit. The second fluid bladder can be configured to release fluid through the second conduit in response to introduction of fluid into the first fluid bladder via the first conduit.