A method of producing a barrier layer of a pressure vessel includes applying the barrier layer to a liner and/or to a fiber-reinforced layer of the pressure vessel while a pressure difference between the internal volume and the surroundings of the pressure vessel is being maintained.

A hydrogen storage tank for a hydrogen fueled aircraft. The tank has a wall made of layers of aerogel sections around a hard shell layer, sealed within a flexible outer layer, and having the air removed to form a vacuum. The periphery of each layer section abuts other sections of that layer, but only overlies the periphery of the sections of other layers at individual points. The wall is characterized by a thermal conductivity that is lower near its gravitational top than its gravitational bottom. The tank has two exit passageways, one being direct, and the other passing through a vapor shield that extends through the wall between two layers of aerogel. A control system controls the relative flow through the two passages to regulate the boil-off rate of the tank.

A gas container includes a tubular container main body formed by a plurality of pieces which include a first dome piece and a second dome piece and are disposed separately in an axial direction, the tubular container main body having an internal space configured to store a gas, a first mouthpiece attached to the first dome piece, a second mouthpiece attached to the second dome piece, a storage member configured to store and release a gas, and a tubular accommodation member disposed in the internal space and having an accommodation space accommodating the storage member. A method for assembling a gas container includes a first step of assembling and fixing the accommodation member to the first mouthpiece attached to the first dome piece, and temporarily assembling the accommodation member to the second mouthpiece attached to the second dome piece, and a second step of connecting the pieces to each other.

Provided is a composite inner frame multi-bonded barrel, a shell-integrated projectile propellant tank including the same, and a method for manufacturing the barrel and the tank. The shell-integrated projectile propellant tank may include the composite inner frame multi-bonded barrel including a cylinder portion including a plurality of inner frames bonded together; a dome portion including an upper dome frame and a lower dome frame bonded to an upper end and a lower end of the cylinder portion, respectively; a cylindrical shell coated on an outside of the composite inner frame multi-bonded barrel; and at least one manhole cover sealing a manhole cover coupling hole formed in a center of the upper dome frame or the lower door frame, and the at least one manhole cover has a fluid injection port formed on one side thereof.

A method for forming a reservoir made of a composite material includes a tubular element, two end fittings, each inserted into one end of the tubular element, and a circumferential layer that envelops the tubular element and the end fittings. The circumferential layer is made of resin-impregnated wound fibers. At least one segment of each end fitting has an outwardly tapering shape and the wall has a taper at each end, and thus at each end the wall is pressed against the segment surface having a tapering shape. The tubular element includes a plastic tube surrounded by a longitudinal layer essentially made of parallel fibers in a resin matrix, the parallel fibers being oriented along the longitudinal axis of the plastic tube. The circumferential layer is essentially made of fibers wound around the circumference of the tubular element and end fittings and parallel to each other.

A tank including an enclosure including a tubular body and first and second end walls at the ends of the tubular body, a plurality of equipment units positioned in the enclosure, at least one equipment support to which the equipment units are connected positioned in the enclosure and connected to the enclosure and a method of manufacturing this tank. The equipment units are fixed to the equipment support outside the enclosure, which simplifies putting them into place and limits the risks of damage. Moreover, they are all introduced into the enclosure at the same time, which makes it possible to reduce the time to manufacture the tank.

A method of manufacturing a pressure accumulator, using an AE signal for the pressure accumulator, includes: a first estimation step of estimating with an AE sensor provided at the pressure accumulator, a range of stress levels at each of which a damage AE signal that is generated from the pressure accumulator because of damage of material of the pressure accumulator is in a predetermined state; and a first design step of designing the pressure accumulator such that a minimum thickness of the pressure accumulator is determined based on the stress level range estimated in the first estimation step.

The invention provides a tank feasible for cryogenic service and a method of building the tank. The tank comprises: an inner tank, thermal insulation, and an outer shell that is airtight, wherein the thermal insulation is arranged outside the inner tank and the outer shell is arranged outside the thermal insulation, further comprising a coupling through the outer shell, wherein a vacuum pump outside the tank can be coupled for suction of air and gas from the volume between the inner pressure tank and the outer shell, and further comprising an opening from outside the tank to inside the inner tank for loading and unloading of fluid, wherein the inner tank in operation contains fluid and the volume between the inner tank and the outer shell is at vacuum. The tank is distinguished in that: the thermal insulation comprises several block elements arranged side by side on the inner tank, with a gap in between the block elements, wherein the outer shell comprises several parts that have been joined together to cover the whole outer surface of the insulation, wherein parts of the outer shell covering an insulation block element have shape matching the insulation block element shape and parts of the outer shell covering the gaps between the block elements have inward or outward oriented curved shape if seen in cross section along the respective gaps and are flexible by contracting or stretching the curved shape.

A method for manufacturing a high-pressure tank including a liner and a fiber-reinforced resin layer, the fiber-reinforced resin layer having a first reinforcing layer covering an outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer includes: forming a cylinder member made of a fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member; forming two dome members made of the fiber-reinforced resin; forming a reinforcing body that is the first reinforcing layer by joining the cylinder member and the dome members; and forming on an outer surface of the reinforcing body the second reinforcing layer made of the fiber-reinforced resin and having fibers oriented across the dome members.

A method for manufacturing a high-pressure tank including a liner and a fiber-reinforced resin layer, the fiber-reinforced resin layer having a first reinforcing layer covering an outer surface of the liner and a second reinforcing layer covering an outer surface of the first reinforcing layer includes: forming a cylinder member made of a fiber-reinforced resin and having fibers oriented in a circumferential direction of the cylinder member; forming two dome members made of the fiber-reinforced resin; forming a reinforcing body that is the first reinforcing layer by joining the cylinder member and the dome members; and forming on an outer surface of the reinforcing body the second reinforcing layer made of the fiber-reinforced resin and having fibers oriented across the dome members.