A compressed gas container is disclosed. The compressed gas container has a single one-piece casing surrounding a storage volume and includes a matrix material and reinforcing fibers. The composition of the matrix material between the region of the single one-piece casing facing the storage volume and the region of the single one-piece casing facing the surroundings of the single one-piece casing changes at least once. A method for manufacturing a compressed gas container is also disclosed.

A pressure vessel includes: a liner made of a resin and configured to store a pressurized fluid; and a reinforcing layer made of a fiber-reinforced resin provided around an outer peripheral surface of the liner. The liner includes a body portion having a tubular shape and a pair of side-end portions each having a domical shape. One of the side-end portions extends continuously from one of two ends of the body portion, and the other one of the side-end portions extends continuously from the other one of the two ends of the body portion. The liner includes a restriction portion provided at a center of the liner in an axial direction of the body portion. The restriction portion is configured to restrict displacement of the reinforcing layer in the axial direction.

A cryogenic tank includes a heat insulating material layer which is disposed between a concrete wall and a membrane and includes a secondary barrier layer in an inner portion of the heating insulating material, and a membrane anchor mechanism which penetrates the secondary barrier layer, is fixed to the concrete wall, and presses the membrane. The membrane anchor mechanism includes a seal portion which covers a through portion penetrating the secondary barrier layer.

A method of storing hydrogen involves forming an excavation in the earth and constructing a storage tank therein comprised of integrated primary and secondary containment structures. The primary containment structure composed of a plurality of joinable cylindrical segments, or pre-fabricated sections joined to form a cylinder within the excavation. The secondary containment structure formed by pumping a curable, flowable composition into the cylinder, allowing it to flow out the bottom and up the second annulus to the earth's surface, and then hardening; thereby encasing the primary containment structure. The bottom of the cylinder is sealed with the bottom assembly. The top assembly is attached to the cylinder and tubing and packer are run into the cylinder creating a first annulus between the cylinder and tubing. Top assembly is sealed, fluids circulated out, and the tank dried. Thereafter, the tank is capable of safely storing hydrogen gas.

A method for manufacturing a high-pressure tank including a reinforcing layer in which rims of both ends of a tubular member and rims of a pair of dome members are joined to overlap each other in a radial direction includes producing the dome members and producing the tubular member. The producing of the dome members includes producing a wound body on a mandrel, curing a resin contained in the wound body, shaving the wound body after the resin is cured to reduce, toward a split line, thicknesses of the rims of the dome members to be obtained by splitting the wound body, splitting the shaved wound body into the dome members by cutting the wound body along the split line, and demolding the dome members from the mandrel.

A high-pressure tank includes a reinforcing layer and a liner having a gas-barrier property and disposed on an inner surface of the reinforcing layer. The reinforcing layer includes a cylindrical reinforcing pipe having a plurality of cylindrical pipe forming portions coupled together, and a pair of semispherical reinforcing domes, one of the pair of semispherical reinforcing domes being disposed at a first end of the reinforcing pipe, and the other one of the pair of semispherical reinforcing domes being disposed at a second end of the reinforcing pipe.

A new procedure for constructing cryogenic storage tanks involves erecting a freestanding metal liner. The liner is sized and configured to withstand the hydraulic forces the concrete wall of the tank being poured without the need for temporary stiffeners on the inside surface of lower portions of the liner. Lateral tension ties can be connected to anchor ties on an outward surface of the liner and used to tie the liner to outer formwork. These ties may be spaced up to about 2 m apart. Studs can also be provided on the outer surface of the liner, and a cylindrical ring of cryogenic steel can be integrated into the liner.

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.

A high-pressure tank includes a first reinforcing layer and a second reinforcing layer. The first reinforcing layer is a layer obtained by joining dome members to respective end portions of a cylinder member, the dome members being a pair, and an inner peripheral surface of the cylinder member is exposed to a storage space that stores gas. A first resin layer covers the cylinder member between the first reinforcing layer and the second reinforcing layer. The first resin layer is less permeable to the gas in a thickness direction than the first reinforcing layer.

A high-pressure tank in a method of manufacturing a high-pressure tank includes a liner and a fiber. The manufacturing method includes: preparing a dome and a pipe each having a general portion and a joining end portion formed to be thicker than the general portion such that an outer diameter at least at an end face is larger than an outer diameter of the general portion by an estimated level difference amount; joining the joining end portion of the dome and the joining end portion of the pipe together in an axial direction; cutting off portions on the further outer side in a radial direction than a reference plane, with an outer peripheral surface of the general portion of the dome having a large outer diameter at the joined surface as the reference plane; and winding a carbon fiber around the outer peripheral surface of the liner in helical winding.