A pressure vessel includes a liner and a reinforcing layer. The liner includes a body portion having a cylindrical shape. The liner is configured such that a gas is filled in the liner. The reinforcing layer is made of a material having a linear expansion coefficient lower than a linear expansion coefficient of a material of the liner. The reinforcing layer is formed in contact with an outer surface of the body portion. The reinforcing layer is configured to cover the liner from outside the liner. A thickness of the body portion is set to such a value that the outer surface of the body portion is not separated from the reinforcing layer when the gas that has been filled in the liner is discharged out of the liner.

A container includes first and second hollow shells respectively including first and second inner surfaces to receive a portion of a pressure vessel (PV). The first hollow shell includes a fiber layer that is and at least partially impregnated with resin, and an energy dissipating material that is substantially concentric with the first inner surface and disposed between the first inner surface and the fiber layer. The second hollow shell includes a fiber layer that is at least partially impregnated with resin, and an energy dissipating material that is substantially concentric with the second inner surface and disposed between the second inner surface and the second fiber layer. The first and second hollow shells are attachable to one another to define a volume for at least partially enclosing the PV.

A method for producing a high-pressure tank capable of suppressing break of a surface resin layer due to gas pressure as well as degradation in the tank quality. The method includes winding a thermosetting resin-impregnated fiber bundle around a liner so as to form an uncured fiber-reinforced resin layer thereon, first heating in which the uncured fiber-reinforced resin layer is locally heated at a first temperature so as to leach the thermosetting resin out of the uncured fiber-reinforced resin layer to form the surface resin layer, and the surface resin layer is cured to have cracks generated therein, and second heating in which the tank is entirely heated at a second temperature lower than the first temperature, so that the fiber-reinforced resin layer and surface resin layer are entirely cured, so as to obtain the tank with the surface resin layer locally having cracks generated therein.

A high pressure tank is provided. The high pressure tank provides improved strength and stiffness by optimizing a laminating pattern and a structure of a fiber reinforced plastic that forms a dome portion of the high pressure tank used in a fuel tank of a fuel cell vehicle. The fiber reinforced plastic having relatively high strength is mixed and used for a weak portion of a dome portion of a support layer of a high pressure tank where stress caused by internal pressure of the high pressure tank is concentrated. In particular, bursting strength and stiffness is increased. The usage amount of the fiber reinforced plastic, the number of windings and a thickness by directly reinforcing a weak point of the dome portion are reduced. Accordingly, manufacturing costs of the high pressure tank are reduced.

A pressure vessel and a method of manufacturing the pressure vessel is provided that reduces leaks in type IV pressure vessels having a liner with a corrugated section. The method includes providing a liner having a tubular portion having a corrugated section with circumferential corrugations providing alternating ridges and grooves arranged from one end to an opposing end of the corrugated section, applying a barrier to an outer surface of the corrugated section from one end to an opposing end of the corrugated section such that air voids are formed in annular cavities between the liner and the barrier; and applying resin to an outer surface of the barrier. The barrier prevents intrusion of the resin between the barrier and the liner in the corrugated section.

An organic composite gas storage tank 100 comprises a hollow central portion 106 which is substantially cylindrical and formed integrally with first and second end portions 102, 104, and which defines a longitudinal tank axis 301. The first end portion comprises a hollow truncated conical region which meets the hollow central portion at a first end thereof, the outer and inner radii of the hollow truncated conical region decreasing in a direction along the longitudinal tank axis away from the hollow central portion. An organic fibre winding 107 extends at least between axial positions which coincide with the hollow truncated conical region of the first end portion and the hollow central portion respectively. The first end portion has a higher axial strength than that achievable for hemispherical end portion of a tank of the prior art.

There is provided a high-pressure tank manufacturing method that ensures a shorten heating period compared with a conventional one and eliminates a need for taking out a material for heating after heating. A high-pressure tank manufacturing method includes: disposing a conductive heating material on an outer periphery of a resin liner; winding a conductive fiber with which thermosetting resin is impregnated around the outer periphery of the resin liner on which the heating material is disposed; and heating the heating material and the fiber on the outer periphery of the resin liner by induction heating to harden the thermosetting resin.

A process for collection, storage and transport of boil off-gas from a liquefied natural gas storage tank. An ultra-low temperature, composite gas tank is provided to accept the boil-off gas and saturated vapor at ultra-low-temperatures in a range of about −80° C. to −45° C. (about −112° F. to −229° F.) and at high pressure of about 150 bar (about 2,175.5 psi). Boil off gas collected from liquefied natural gas storage at a pressure in a range of about 15 to 18 bar (217.5 psi to 261 psi) and at a temperature in of about −150° C. (about −238° F.). The ultra-low temperature, composite gas tank can hold the gas as it warms to ambient temperature. The process includes a liner step; a filament step; a wrap step; and a filling step. Optional steps include an insulation step; a fiber step; a layering step; a nozzle step; and a gas step.

The disclosure describes a pressure vessel having a first end with a first boss and a cylindrical portion. The vessel includes a liner, a composite shell disposed over the liner, and a first longitudinal vent disposed between the liner and the composite shell. The first longitudinal vent includes an elongated vent defining element and extends at least from the cylindrical portion of the vessel to the first boss.

A method for forming a reservoir made of a composite material includes a tubular element, two end fittings, each inserted into one end of the tubular element, and a circumferential layer that envelops the tubular element and the end fittings. The circumferential layer is made of resin-impregnated wound fibers. At least one segment of each end fitting has an outwardly tapering shape and the wall has a taper at each end, and thus at each end the wall is pressed against the segment surface having a tapering shape. The tubular element includes a plastic tube surrounded by a longitudinal layer essentially made of parallel fibers in a resin matrix, the parallel fibers being oriented along the longitudinal axis of the plastic tube. The circumferential layer is essentially made of fibers wound around the circumference of the tubular element and end fittings and parallel to each other.