A high-pressure gas tank includes: a tank body section; a base attached to an opening of the tank body section; a valve attached to an opening of the base so as to open and close a gas supply-discharge port of the tank body section, a part of the valve being inserted in the base, and the valve having a contact surface that contacts a seat surface as a surface of an end of the base, the surface of the end of the base forming the opening of the base; and a seal member arranged between an outer peripheral surface of a portion of the valve that is inserted in the opening of the base and an inner peripheral surface of the base. A slit for forming a communication hole communicating between outside of the high-pressure gas tank and a space between the base and valve is provided.

A cryogenic hydrogen storage vessel includes an outer vacuum vessel, a reinforcement ring on the outer vacuum vessel, an inner pressure vessel inside of the outer vacuum vessel, and a vacuum space between the outer vacuum vessel and the inner pressure vessel. One embodiment of the cryogenic hydrogen storage vessel includes an outer vacuum vessel; a hump-shaped reinforcement ring on the outer vacuum vessel, the hump-shaped reinforcement ring including an external hump portion that protrudes from the hump-shaped reinforcement ring and an internal recess in the hump-shaped reinforcement ring; an inner pressure vessel inside of the outer vacuum vessel, a vacuum space between the outer vacuum vessel and the inner pressure vessel, and a composite support ring in the vacuum space extending from the hump-shaped reinforcement ring on the outer vacuum vessel to the inner pressure vessel, the composite support ring nested in the recess in the hump-shaped reinforcement ring.

A deformable reservoir for storing solid hydrogen, containing at least one compound that can absorb or release hydrogen, and wherein it includes at least two rigid bars each including a polymer liner defining at least one compartment for storing the compound and accommodated inside a reinforcing structure having globally the shape of a hollow cylinder closed at each of its longitudinal ends by a closing flange, a connection attached to the reinforcing structure of at least one of the bars so as to be sealed to the liner, a flexible union member joining two adjacent bars so as to allow the totality of the storage reservoir to be deformable in spite of the rigidity of each bar.

A pressure vessel includes a vessel main body, a first protective member, and a second protective member. The vessel main body is configured to contain gas inside. The second protective member is configured to exhibit performance that is different from that of the first protective member. One of the first protective member and the second protective member has recesses that the other one of the first protective member and the second protective member does not have at an end on a peak of a domical panel side provided with the one of the first protective member and the second protective member.

A ring and method of manufacturing a ring which may include: an outer ring, in which a second carbide composed of a combination of tungsten carbide, iron group carbide or carbonitride is mixed with a metal binder phase at a predetermined ratio, in which the outer ring is divided into a first outer ring and a second outer ring formed in a shape corresponding to each other; an inner ring separately and/or independently assembled between the first and second outer rings, in which the inner ring includes an outside inner ring that forms an outer circumferential surface of the ring and an inside inner ring that forms an inner circumferential surface of the ring; ring fitting parts formed on the first and second outer rings, respectively, such that both sides of the outer and inside inner rings are press-fit; and assembling protrusions formed on the first and second outer rings, respectively, to be inserted into the outer circumferential surface of the inside inner ring to maintain a firm assembly between the outer ring and the inner ring for a long period of time.

Provided are a tow prepreg comprising a reinforcing fiber bundle impregnated with a matrix resin composition, wherein the matrix resin composition contains a component (A) (an epoxy resin), a component (B) (dicyandiamide), a component (C) (a curing accelerator), and a component (D) (a core-shell type rubber particle), and a content of the component (D) with respect to 100 parts by mass of the component (A) is from 20 to 70 parts by mass, a viscosity is from 3 Pa.Math.s to 80 Pa.Math.s at 30 C., and a minimum viscosity to be obtained when a viscosity is measured by raising a temperature from room temperature to 130 C. at a rate of temperature rise of 2.0 C./min is from 0.04 Pa.Math.s to 1 Pa.Math.s, which exhibits excellent drape property and tackiness and less stickiness and can be unwound at a high speed; and a composite material-reinforced pressure vessel having fewer voids in a reinforcing layer which is obtainable by using the tow prepreg, a high burst pressure, and an excellent appearance due to appropriate resin flow.

A cryogenic liquid tank (1) includes a reservoir (5) that includes a bottom portion (5a, 5a1, or 5a2) and a side wall (5b), a support portion (4) that supports the reservoir (5), and an intermediate member (10) that is provided between the reservoir (5) and the support portion (4). The support portion (4) includes an outer support portion (4b) which supports the side wall (5b), and an inner support portion (4a) which is disposed to be adjacent to an inner side of the outer support portion (4b), includes a heat insulating layer formed of an elastic material, and supports the bottom portion (5a, 5a1, or 5a2) of the reservoir (5). A cover portion (9a, 9a1, or 15) covering a boundary between the outer support portion (4b) and the inner support portion (4a) is provided between the support portion (4) and the intermediate member (10).

A high pressure tank having a reinforced boss part includes: a liner; a dome formed at each end of the liner; and a boss formed at one end of the dome. The boss includes: a head including a flow path through which fuel flows into and out of the high pressure tank; and a shoulder extending in a radial direction from the head and surrounding the head. The shoulder has one or more hollow portions formed therein.

A pressure vessel (10) is provided with: a cylinder part (1) that defines a pressure chamber (11); a screwing part (3) that is disposed inside at least one of the two ends of the cylinder part; a lid (2) that has a pressure-receiving surface (2A) facing the pressure chamber and that is disposed at a position closer to the pressure chamber than is the screwing part; and a reinforcing ring (4) that is fitted to the outer circumferential surface of the cylinder part. The reinforcing ring covers, along the axial direction of the cylinder part, a part on an outer circumferential surface (1F) corresponding to a portion or the entirety of the engaging portion (12) between the cylinder part and the screwing part.

A high-pressure container unit includes: a box-shaped case mounted on a vehicle and configured to include a bottom portion, a ceiling portion, and a peripheral wall portion; a plurality of container main bodies arranged in an interior of the case and each having a cylindrical body portion; and a reinforcing member extending along an axial direction of the container main body, the reinforcing member being provided in at least one of a space surrounded by the container main bodies adjacent to each other and the bottom portion and, a space surrounded by the container main bodies adjacent to each other and the ceiling portion.