The invention relates to a sealed tank wall used to form a sealed tank for storing a fluid, the wall comprising: a flat frame (3) including a perimeter (4) and longitudinal stiffening members (5) arranged inside the perimeter (4) in a longitudinal direction such that each longitudinal stiffening member extends from one side of the perimeter (4) to an opposite side of the perimeter (4), the perimeter (4) and the longitudinal stiffening members (5) being designed to form openings in the frame (3), lobed walls fastened to the frame (3) by welding about said openings to close said openings, such as to project into a thickness direction orthogonal to the frame (3) and towards the outside of the tank to be formed.

The present invention provides a pressure vessel for hydrogen in which the development of cracking in the pressure vessel for hydrogen can be effectively inhibited and that is excellent in terms of safety, reliability, and durability. The present invention pertains to a pressure vessel for hydrogen in which a plastic region is present on the inner face side of a hydrogen pressure vessel main body, an elastic region is present on the outer face side, and compressive residual stress is generated on the inner face, wherein preferably: the equivalent plastic strain remaining on the inner surface of the hydrogen pressure vessel main body is 1% or below; the plastic region on the inner face side measures 50% or less of the wall thickness in the radial direction of the hydrogen pressure vessel main body; and the steel used has a tensile strength of at least 725 MPa.

A composite pressure vessel includes: a body including an inner liner which includes a cylindrical portion extending along a longitudinal axis, and which is made of a thermoplastic polymer material; and an outer thermoset reinforcing structure wrapped around the body and made of a continuous fiber reinforced thermoset matrix composite, including reinforcing fibers and a thermoset matrix. The body further includes a thermoplastic reinforcement layer made of a continuous fiber reinforced thermoplastic composite, including reinforcing fiber and a thermoplastic matrix, which is adhered to the cylindrical portion of the inner liner.

The invention refers to a method of manufacturing a pressure tank, comprising an inner container and an outer layer made of a fiber material which is wound around the inner container. In performing the method, a retention device with several retention elements protruding therefrom is attached to an inner container so as to wind a local pole cap reinforcement in a dome-shaped pole cap portion of the inner container. Then the retention device is removed and an outer layer is produced by winding of fiber material, the outer layer surrounding the central portion and the pole cap portions of the inner container.

A method for manufacturing tanks for storing or containing a fluid under pressure and a method for manufacturing pipes for containing or channeling a fluid under pressure, such as for storing, containing or channeling hydrogen, natural gas or a hydraulic fluid. The method is less complex than known procedures, can be employed in a continuous or semi-continuous manner and allows for a lower thickness of the shell made from the fibres. The method comprising providing a liner having a cylindrical portion with two ends and two dome portions at the respective ends of the cylindrical portions or a liner having a cylindrical portion and one or two open ends; fabricating a tube of fibre filaments by means of the pullwinding method; and wrapping the tube of fibre filaments onto the liner such that at least the cylindrical portion of the liner is enclosed by the tube of fibre filaments.

An in-situ melt processing method for forming a fiber thermoplastic resin composite overwrapped workpiece, such as a composite overwrapped pressure vessel. Carbon fiber, or other types of fiber, are combined with a thermoplastic resin system. The selected fiber tow and the resin are prepared for impregnation of the tow by the resin. The resin is melted; and, carbon fiber is impregnated with the melted resin at the filament winding machine delivery head. The molten state of the composite is maintained and is applied, in the molten state, to the heated surface of a workpiece. The portion of the surface being wrapped is heated to the melting point of the thermoplastic resin so that the molten composite more efficiently adheres to the heated surface of the workpiece and so that the uppermost layer of fiber resin composite is molten when overwrapped resulting in better adherence of successive layers to one another.

A high-pressure tank includes: a liner made of resin and including a tubular body portion and a pair of dome-shaped side end portions provided in the opposite ends of the body portion; and a fiber reinforced resin layer made of a fiber reinforced resin and covering an outer peripheral surface of the liner. The fiber reinforced resin layer is formed by winding a fiber bundle impregnated with a resin, and an outer peripheral surface of the fiber reinforced resin layer is covered with a resin layer made of a resin. A part of the fiber reinforced resin layer includes a protrusion portion by continuously winding the fiber bundle in an overlapped manner along the circumferential direction of the body portion the part of the fiber reinforced resin layer covering the body portion.

A method for manufacturing a high-pressure tank including a liner that stores gas and a reinforcing layer made of a fiber-reinforced resin and covering an outer surface of the liner includes: a first step of forming a cylinder member made of the fiber-reinforced resin; a second step of forming two dome members made of the fiber-reinforced resin; and a third step of forming a reinforcing body that is the reinforcing layer by joining both end portions of the cylinder member and end portions of the two dome members, respectively. The first step includes forming the cylinder member by winding a release material around a mandrel and winding the fiber-reinforced resin on the release material.

A manufacturing method of a high pressure tank includes at least : shrinking a liner by cooling the liner, inserting the liner into a cylindrical member to cover a body of the liner in a shrunk state by the cylindrical member, expanding the liner in the shrunk state to fit the cylindrical member to the body by raising the temperature of the liner inserted into the cylindrical member, joining circumferential edge portions of dome members to circumferential edge portions of the cylindrical member that is fit to the body, to cover end portions by the dome members, and form a first reinforcing layer.

A high-pressure tank includes: a liner including a body portion having a tubular shape and side end portions each having a dome shape, the side end portions being provided on opposite sides of the body portion; and a reinforcement layer made of fiber reinforced resin covering an outer surface of the liner. The reinforcement layer includes a tubular member covering the body portion and dome members joined to opposite sides of the tubular member so as to cover the side end portions. The liner includes a first resin layer defining a storage space for storing gas and a second resin layer provided between the first resin layer and at least the tubular member. An elastic modulus of a second resin constituting the second resin layer is lower than an elastic modulus of a first resin constituting the first resin layer.