A high-pressure container that includes a cylinder and at least one half-shell. The cylinder forms a middle region of the high-pressure container, and includes a multilayer composite plastic as a first barrier layer. The at least one half-shell is formed at an axial end of the cylinder, and includes a multilayer composite plastic as a second barrier layer, and a substantially rotationally symmetrical boss member having an undercut with respect to a protrusion in a direction of a longitudinal centre axis of the boss member. The multilayer composite plastic of the half-shell is arranged axially on both sides of the undercut of the boss member.

A hydrogen tank body includes a base layer formed of a synthetic resin selected from the group consisting of silicon resin, polyphenylene sulfide, polybutylene terephthalate, polyvinyl chloride, polypropylene, polyethylene, and polycarbonate, and a liner layer formed of hydrogen impermeable resin, on an inside wall surface of the base layer.

An improved gas cylinder configured to prevent degradation of a contained pressurized reactive gas includes a metallic gas cylinder configured to store a pressurized reactive gas within the cylinder. The improved gas cylinder further includes a cylinder lining including parylene. In one embodiment, the parylene lined cylinder can be heat treated. The improved gas cylinder prevents cracking of the cylinder lining, thereby preventing the contained reactive gas from coming into contact with the metallic gas cylinder.

A restraining structure for a structural body includes: a restrained portion that is a tubular body or a stacked body; a pair of holding portions provided at the restrained portion; a first CFRP belt wrapped around the restrained portion in an axial direction of the restrained portion so as to extend between the pair of holding portions and having carbon fibers of a 0° direction along the axial direction; and a second CFRP belt stacked adjacent to an outermost layer near an end of the first CFRP belt and having carbon fibers of 45° to 90° directions with respect to the axial direction. One of the holding portions is provided at an end of the restrained portion. The other of the holding portions is provided at the other end of the restrained portion.

A precast, prestressed concrete tank and method that facilitates construction of a primary inner tank within a secondary outer tank, and which permits for the construction of the primary inner tank after the secondary outer tank has been erected, but without requiring insertion through a top of the secondary outer tank, or by tunneling underneath the secondary outer tank, is disclosed. The primary inner tank has an inner wall and the secondary outer tank has an outer wall (precast, prestressed concrete) and wire windings. The primary inner tank is disposed inside of the secondary outer tank. The secondary outer tank has a plurality of first precast outer wall panels, and a temporary construction opening frame. The temporary construction opening frame defines an access doorway during construction of the tank. The temporary construction opening frame is disposed on a foundation base slab.

A pressure vessel includes a vessel body, a covering part, and a cylindrical mouthpiece. The vessel body includes a cylindrical open end portion on at least one end side of the vessel body. The covering part is made of a fiber reinforced resin and covers an outer surface of the vessel body. The mouthpiece is configured such that a plurality of mouthpiece bodies each having a projection on an inner surface of the mouthpiece body is connected to each other in a circumferential direction of the open end portion. The mouthpiece is attached to an outer peripheral surface of the open end portion by the projections biting into the covering part covering the outer peripheral surface of the open end portion. The mouthpiece bodies of the mouthpiece are connected to each other by fitting together fitting portions formed at end portions of the mouthpiece bodies in the circumferential direction.

A storage tank for a gas is provided. The storage tank includes a liner defining an internal compartment; a boss coupled to the liner; an interlayer covering a portion of the boss and the liner, the interlayer being non-pyrolyzed and including an interconnected web and pores having a diameter greater than the diameter of a hydrogen molecule and less than or equal to about 2 nm; and an outer shell including a carbon fiber reinforced composite, the outer shell covering the interlayer, except for an interlayer end that is in contact with the boss, so that the interlayer end defines an interlayer ring that is exposed to an external environment. The storage tank is configured so that when gas diffuses through the liner to the interlayer, the interlayer channels the gas out of the exposed interlayer ring. Methods of fabricating the storage tank are also provided.

An accumulator vessel (10) includes a screwable portion (3) and a lid portion (2) that is positioned at an axially inner side of the screwable portion and an axially inner surface configures a pressure bearing plane. The lid portion includes a protruding portion (22) extending axially outward on an inner circumferential side, and the protruding portion configured to abut against an axially inner end side of the screwable portion to separate an axially inner surface of the screwable portion on an outer circumferential side thereof apart from an axially outer surface of the lid portion on an outer circumferential side thereof.

A precast, prestressed concrete tank and method that facilitates construction of a primary inner tank within a secondary outer tank, and which permits for the construction of the primary inner tank after the secondary outer tank has been erected, but without requiring insertion through a top of the secondary outer tank, or by tunneling underneath the secondary outer tank, is disclosed. The primary inner tank has an inner wall and the secondary outer tank has an outer wall (precast, prestressed concrete) and wire windings. The primary inner tank is disposed inside of the secondary outer tank. The secondary outer tank has a plurality of first precast outer wall panels, and a temporary construction opening frame. The temporary construction opening frame defines an access doorway during construction of the tank. The temporary construction opening frame is disposed on a foundation base slab.

Provided is a pressure vessel having an outer layer with an improved gas barrier property, a lightweight liner with an excellent gas barrier property, and a novel method for manufacturing a pressure vessel. The pressure vessel contains a liner and an outer layer of the liner, wherein the outer layer is configured by a composite material that contains a continuous fiber and a polyamide resin impregnated into the continuous fiber; the polyamide resin contains a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; and 50 mol % or more of the structural unit derived from diamine is derived from xylylenediamine.