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 metering device for attaching to a container configured to store a fluid, the device including: a valve configured to control the amount of fluid dispensed from the container; a user interface comprising at least one control configured to operate the valve between an open position and a closed position; and a control circuit configured to set a threshold amount of the fluid to be dispensed from the container, where the control circuit is configured to override the user interface and close the valve when the threshold amount of fluid to be dispensed has been reached.

A method and apparatus for cooling a compressed fuel gas during transfer of the gas from a source vessel to a receiving vessel. The method includes receiving a portion of the fuel gas from the source vessel in an intermediate vessel. Then, fluidly isolating the intermediate vessel from the source vessel. Work is then extracted from the fuel gas by causing or allowing expansion of the fuel gas, thereby cooling the fuel gas. Finally, the cooled portion of fuel gas is released from the intermediate vessel to the receiving vessel.

Provided is a foot ring secured to a tank having a collar, The foot ring includes a base having an inner and outer surface, a central portion, and an outer peripheral portion, a plurality of circumferentially spaced deflectable longitudinal lock tabs extending around the base for securing the foot ring to the tank, and a plurality of circumferentially spaced deflectable rotational lock tabs extending around the base for preventing rotational movement of the foot ring relative to the tank. Each of the circumferentially spaced deflectable longitudinal lock tabs have a first projection and a catch extending from the first projection for engaging a flange of the collar, and each of the circumferentially spaced deflectable rotational lock tabs have a second projection configured to be received in a respective notch in the flange.

A high-pressure tank for storing a gas includes: a liner having a cylindrical opening; a reinforcing layer covering the liner; a mouthpiece including an external thread portion on an outer periphery thereof and externally fixed to the reinforcing layer covering the opening; a manifold including an inserted portion to be inserted into the opening so as to close the opening, an abutting surface configured to abut on an end face of the opening, and an internal thread portion on an inner periphery thereof to be screwed into the external thread portion of the mouthpiece; and a communicating path that allows the abutting surface of the manifold to communicate with an outside of the high-pressure tank.

A high-pressure tank includes a liner that includes a body that is cylindrical in shape and a pair of dome portions each of which is provided at a respective end of the body in an axial direction, and a reinforcing layer provided on an outer circumferential face of the liner. The reinforcing layer includes a pair of resin rings each of which is provided encircling a respective end portion of an outer circumferential face of the body, a hoop layer that covers part of the outer circumferential face of the body, between the resin rings, and a helical layer that covers the resin rings, the hoop layer, and the dome portions. The resin rings are configured to cover part of the body from boundary portions between the body and the dome portions, and increase in thickness from the boundary portions toward a middle of the body.

A vehicle mounted monitoring system for removable propane tanks includes a propane tank holding system, at least one tank measuring sensor, a hard-wired vehicular power connection, a main control module, and a vehicular display module. The propane tank holding system includes at least one resting bracket so that a propane tank can be placed and secured. The tank measuring sensor is operatively coupled to the resting bracket to measure the remaining amount of liquid in the propane tank. The hard-wired vehicular power connection is electrically connected to the tank measuring sensor for continuous operation. The tank measuring sensor is electronically connected to the vehicular display module through the main control module so that the user can be informed.

An apparatus and a method are provided for an alternative fuel system, comprising a plurality of fuel tank assemblies interconnected with fuel lines; the plurality of fuel tank assemblies comprising a CNG fuel tank and a fuel tank shield; wherein a first and second fuel tank assembly is disposed immediately in front of a rear wheel assembly, and a third fuel tank assembly is disposed immediately behind the rear wheel assembly.

A computer-implemented method of supplying a fuel gas to a fueling system is disclosed. The method may include pre-fill inerting the fueling system; leak-checking the fueling system; charging a pilot subsystem with the fuel gas; filling the fueling system with the fuel gas; and post-fill inerting the fueling system. In many implementations, the fueling system may be associated with a boat. The fuel gas may be hydrogen and may be supplied to a fuel cell that converts the hydrogen to electrical energy to power a propulsion system of the boat.

Provided are a method and apparatus for calculating a volume of a compressed gas storage vessel, a computer, and a medium. According to the method, three test vessels with known volume and initial pressure are used to establish a pressure equilibrium with a compressed gas storage system, and pressure values in three equilibrium states are respectively detected. In this way, according to the three pressure values and the known volumes and initial pressures, a volume of the compressed gas storage system, a volume of a hose, and a pressure value of the compressed gas storage system in an initial state can be quickly and accurately calculated. By accurately obtaining the volume of the compressed gas storage system, the volume of the hose, and the pressure value of the compressed gas storage system in the initial state, a refueling rate can be increased as much as possible while ensuring safe refueling.