An internal casing for a pressurized fluid storage tank for a motor vehicle includes: a hollow body includes a layer made of a first polymer material; and a neck arranged on the hollow body and delimiting an opening of the hollow body, the neck receiving an interface part mounted on the neck in a sealed manner by a gasket arranged between the neck and the interface part. The neck is made of a composite material composed of a second polymer material loaded with reinforcing fibers, the composite material having a deformation resistance than that of the first polymer material. The neck is joined to the hollow body by molecular entanglement of polymer chains of the first polymer material and polymer chains of the second polymer material. Methods for manufacturing such an internal casing, and a storage tank including such an internal casing are disclosed.

A manufacturing method for manufacturing a reinforced layer constituting a high-pressure tank includes: a first forming step of forming a cylindrical pipe portion and extending in an axial direction of the high-pressure tank, the pipe portion including a first end portion including a first end and a second end portion including a second end, the pipe portion being formed to have a first stepped portion such that the first stepped portion projects outwardly at a position distanced from the first end in the axial direction by a first distance; a first placing step of placing the first end inside a first dome portion by moving at least either of the first dome portion and the pipe portion until a first bottom end portion of the first dome portion abuts with the first stepped portion; and a first joining step of joining the pipe portion to the first dome portion.

A manufacturing method for manufacturing a tank includes: a step of forming a structural body constituted by a liner and a fiber reinforced resin layer placed on the outer periphery of the liner, the structural body including a cylindrical portion and dome portions provided in opposite ends of the cylindrical portion in the axial direction of the cylindrical portion; a step of winding a heat insulating sheet around the fiber reinforced resin layer after the step of forming the structural body, the heat insulating sheet having notches in dome forming portions provided to correspond to the dome portions; and a step of covering the dome portions with the dome forming portions.

The present invention is directed to a reinforcement method for a cylindrical high-pressure tank reinforced by FRP prepreg bandage, totally. For that purpose, this invention developed the manufacturing process for the internal metallic tank assembly where its diameter is comparatively large. It is effective for lightening weight of a high-pressure tank.

Embodiments are directed to fiber-reinforced compressed gas storage tanks or vessels comprising one or more shells that are made by metal forming, plastic molding, braiding, filament-winding, or fiber placement. Particular embodiments employ one or more discrete pre-formed fiber-reinforced endcaps with fibers oriented in preferential angles that are integrated to the vessel end-domes to reinforce the polar openings and the dome-cylinder transition areas of the load carrying shells.

A high-pressure container includes a cylinder composed of plastic, at least one half-shell composed of plastic, a substantially rotationally symmetrical insert as a boss member, and a sleeve. The cylinder is to serve as a centre member, while the at least one half-shell is at an axial end of the cylinder. The insert as a boss member, the insert having a foot member at an end thereof facing the container interior. The foot member is embedded in the plastic of the half-shell to substantially form a hollow cone or hollow cylinder. The sleeve is pressed into the inner circumference of the foot member at least in a pressing portion of the sleeve. The plastic of the half-shell is arranged between the sleeve and an inner circumference of the foot member so that in a pressing portion, a thin plastic layer of the plastic of the half-shell is pressed between the sleeve and the inner circumference of the foot member.

The present disclosure provides a pressure vessel 10 (sometimes known as a composite overwrapped pressure vessel or “COPV”) comprising carbon fiber 20 (such as carbon fiber 20 filaments) wrapped around a tank liner 30.

The present invention is a pressure tank comprising a tubular part and two bottoms (5) with the bottoms (5) positioned at the ends of the tubular part. The tubular part comprises a cylindrical wall (1) and a ply of circumferential reinforcing elements (2) wound around cylindrical wall (1). The elastic modulus of the material of cylindrical wall (1) is less than the elastic modulus of the material of the first ply of circumferential reinforcing elements (2). The invention also relates to an energy storage and recovery system comprising a compressor, an expansion device, a heat storage and a compressed air tank according to the aforementioned characteristics.

A tank for pressurized gas, such as hydrogen, comprises a structure defining a volume of the tank and having at least one opening. There are as many bases as there are openings, with each base being disposed in one of the openings. A sealing enclosure covers an entire internal surface of the structure and interfaces with the base. At least one conduit allows leakage between an outer surface of the sealing enclosure and an outside of the tank. The base has a recessed external profile with an undercut at an interface with the structure. The at least one conduit comprises at least one chute interposed between the structure and the base.

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.