This invention relates to methods of fabricating components of a pressure vessel using a dicyclopentadiene prepolymer formulation in which the purity of the dicyclopentadiene is at least 92% wherein the formulation further comprises a reactive ethylene monomer that renders the prepolymer formulation flowable at ambient temperatures and to pressure vessels that are fabricated by said methods.

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.

A pressure vessel includes a first (base or innermost) layer composed of a resin-impregnated woven sleeve with chopped basalt fibers assembled in the voids of the sleeve and impregnated with an epoxy resin. A second and third layer is composed of continuous basalt fiber filaments arranged in a helical pattern, with the helical angle of the second layer being not equal to that of the third layer. A fourth layer is composed of continuous basalt fibers arranged in a hoop pattern. The fifth (outermost) layer is composed of randomly oriented chopped basalt fibers impregnated with a resin matrix and compacted with the subsequent wound filaments at up to ten pounds of tension.

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 tank for containing a pressurized fluid, including at least one cylindrical element made of a pultruded fibrous material impregnated with a thermoplastic matrix, a first cap placed at one end of at least one cylindrical element closing it, a second cap placed at the other end of at least one cylindrical element, fitted with an orifice intended to make possible the entry and the exit of the fluid, and at least one additional fibrous reinforcement, partially or completely surrounding the cylindrical element(s) and optionally the caps, the fibers contained in the additional fibrous reinforcement being positioned along a different axis from the longitudinal axis of the cylindrical element, the total content of fibers of the tank being of between 40% and 70% by volume, with respect to the volume of the matrix and of the fibers contained in the tank.

The present invention relates to a method for manufacturing an internal shell of a composite type IV reservoir delimiting an internal cavity intended to accommodate a pressurized fluid and comprising at least one metal baseplate allowing connection between said internal cavity and the outside of the internal shell, said baseplate or baseplates being secured to the internal shell, said method comprising the following steps: a) a step of applying at least one adhesive layer of a first polymer to the part or parts of the metal baseplate or baseplates intended to be in direct contact with the material of which the internal shell is made; b) a step of incorporating said baseplate or baseplates thus coated into a mould the internal cavity of which is of a shape that corresponds to the shape of the internal shell that is to be obtained; c) a step of forming, on the internal wall of the mould and on the part or parts of the baseplate or baseplates intended to be in contact with the material of which the internal shell is made, at least one layer of a second polymer different from said first polymer and adhering to the first polymer, thus forming the aforementioned internal shell equipped with the aforementioned baseplate or baseplates.

It is an object of the present invention to provide a pressure container configured so that a seal member is excellent at maintainability and has a simple structure. The container includes a hollow plastic liner (2) provided with a projected cylindrical neck portion (2b), and to reserve gas or liquid; a mouthpiece member (3) disposed outside the neck portion (2b) in a radial direction; a reinforced layer (4) covering outsides of the plastic liner (2) and the mouthpiece member (3); an attachment member (5) capable of being inserted between the neck portion (2b) and the mouthpiece member (3), and attachable to and detachable from the mouthpiece member (3); and a first seal member (6) disposed between an outer peripheral surface of the neck portion (2b) and an inner peripheral surface of the attachment member (5).

An assembly or apparatus for use in relation to an assembly, wherein said assembly is subjected to a temperature of less than 50 C. in use, wherein said assembly or apparatus includes a component which comprises a polymeric material (A) having a repeat unit of formula OPhOPhCOPh(I) wherein Ph represents a phenylene moiety; and wherein said polymeric material (A) has a melt viscosity of at least 0.50 kNsm.sup.2.

A hydrogen storage container has an inner side resin layer that comes into contact with hydrogen gas that is introduced into the container, a barrier layer which is disposed on the outside of the inner side resin layer and which prevents permeation of hydrogen gas, and an outer side resin layer comprising a resin. Among these layers, the inner side resin layer comprises a polyethylene-based resin, and if the thickness of the barrier layer is denoted by Y and the thickness of the inner side resin layer is denoted by X, the thickness X satisfies formula (1). Moreover, D in formula (1) is the diffusion coefficient of the polyethylene-based resin, as determined by means of a differential pressure method at 50 C.

Multilayer structure for transporting hydrogen, including, from the inside, at least one sealing layer and at least one composite reinforcing layer, an innermost composite reinforcing layer being wound around an outermost adjacent sealing layer, the sealing layers of a composition predominantly of at least one semi-crystalline, long-chain polyamide thermoplastic polymer P1i (i=1 to n, n being the number of sealing layers), the Tf of which, as measured according to ISO 11357-3: 2013, is greater than 160 C., with the exception of one polyether block amide (PEBA), up to 50% by weight of impact modifier relative to the total weight of the composition and up to 1.5% by weight of plasticiser relative to the total weight of the composition, the composition being free of nucleating agent, and at least one of the composite reinforcing layers being of a fibrous material.