A pressure vessel and a method of manufacturing the pressure vessel is provided that reduces leaks in type IV pressure vessels having a liner with a corrugated section. The method includes providing a liner having a tubular portion having a corrugated section with circumferential corrugations providing alternating ridges and grooves arranged from one end to an opposing end of the corrugated section, applying a barrier to an outer surface of the corrugated section from one end to an opposing end of the corrugated section such that air voids are formed in annular cavities between the liner and the barrier; and applying resin to an outer surface of the barrier. The barrier prevents intrusion of the resin between the barrier and the liner in the corrugated section.

Provided is a pressure vessel intended for storing up a fluid having high pressure, and more specifically, to a pressure vessel capable of enabling a sealing pad made of an elastic material to effectively prevent the fluid from flowing out from a bonding portion of a nozzle and a liner. The pressure vessel includes: a liner formed to be hollow so as to enable its inside to be filled with the fluid; a nozzle combined with one side of the liner, or each end portion of both sides so as to enable a coupling part having a cylindrical shape to be located in the inside of the liner; a sealing pad having a ring-like shape configured to enable the coupling part to pass through its center, and formed of an elastic material; and a sealing nut coupled to the coupling part from a lower portion of the sealing pad.

A composite pressure vessel that includes a monolayer liner and a reinforcing structure arranged on top of the liner. The liner is made by injection moulding and includes at least two shells weldable together. Each shell is made of a polymer composition including at least 45% by weight of an aromatic polyamide relative to the total weight of the polymer composition, and at least 10% by weight of an aliphatic polyamide relative to the total weight of the polymer composition.

A hollow molded article having a joining site where two or more split objects are welded by plastic welding and comes into contact with pressurized hydrogen, wherein an average spherulite size in a portion which is 500 m deep inside from a surface of the hollow molded article is 20 m or less, and a tensile strength of a test piece containing the joining site of the hollow molded article is 80% or more based on a tensile strength of a test piece not containing the joining site of the hollow molded article.

A steel pipe or tube for pressure vessels having excellent quench crack resistance is provided. The steel pipe or tube for pressure vessels comprises: a specific chemical composition; and a metallic microstructure in which an average grain size of prior austenite grains is 500 m or less, and an area fraction of microstructures other than ferrite is 50% or more.

The present invention relates to a pressure vessel, comprising a connecting element, an inner vessel and a support shell which surrounds the inner vessel, wherein the pressure vessel has the following features: the connecting element comprises a neck section in the form of a sleeve and a shoulder section; the connecting element is bonded via its outer face to an inner face of the inner vessel; the inner vessel is bonded to the support shell in such a way that the inner vessel is arranged in a sandwich-like manner at least in sections between the connecting element and the support shell; and the pressure vessel has at least one orifice delimited by the neck section of the connecting element, wherein the pressure vessel is characterized in that the outer face of the connecting element facing the inner vessel at least partly has a mean roughness of more than 50 m.

A method of manufacturing a high pressure tank includes: preparing a liner; forming a fiber reinforced resin layer which is a layer of a fiber reinforced resin on an outer side of the liner, and forming a resin layer which is a layer formed of a portion of a thermosetting resin on an outer surface of the fiber reinforced resin layer; increasing a temperature of the fiber reinforced resin layer and the resin layer to a predetermined temperature which is a temperature at which the thermosetting resin is cured; causing a pressure in the liner to be regulated to be a second pressure higher than a first pressure which is a pressure in the liner in the forming of the fiber reinforced resin layer and the resin layer; and maintaining the temperature of the fiber reinforced resin layer and the resin layer at the predetermined temperature.

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 recipient or vessel (1) has a polymeric impermeable liner (2) and a reinforcing layer (4) of a composite material externally formed around the impermeable liner (2), as well as at least one boss (5) coupled to the impermeable liner (2) and to the reinforcing layer (4) to provide an opening (6) of the pressure vessel (1). The impermeable liner (2) is joined to the boss (5) by a co-molded polymer-metal annular connection zone (7).

To provide a polymer alloy excellent in resistance to a high-pressure gas.

A polymer alloy, having a fluorinated copolymer having a carbonyl group-containing group, having a melting point of 250? C. or lower, and at least one thermoplastic polymer selected from the group consisting of a polyamide and an ethylene/vinyl alcohol copolymer, immiscible with the fluorinated copolymer and having a melting point of 250? C. or lower, melt-kneaded, wherein the proportion of the fluorinated copolymer to the total mass of the polymer alloy is from 10 to 40 mass %, and particles of the fluorinated copolymer are dispersed in the thermoplastic polymer, and the average particle size of the fluorinated copolymer particles in the polymer alloy is from 0.001 to 10 ?m.