A hydrogen pressure vessel capable of preventing hydrogen-induced cracking of a cylinder is provided. In a hydrogen pressure vessel according to one embodiment, a gap part (G) in which an inner peripheral surface of a cylinder (10) is spaced apart from an outer peripheral surface of a lid (20) is provided between a female thread part (10a) of the cylinder (10) into which the lid (20) is screwed, and a resin seal member (30), and the cylinder (10) includes a first through hole (41) for discharging gas in the gap part (G) into a relief pipe (51) and a second through hole (42) for introducing gas containing oxygen into the gap part (G) formed therein.

A cap for closing an opening of a receptacle such as for a liquefied natural gas container. The cap includes a main body and a sealing surface for sealing the opening of the receptacle. A lock/release mechanism is provided to lock the cap onto the receptacle, or enable the cap to be removed from the receptacle. A relief valve of the cap is activatable to relieve pressure within the receptacle. A grip overlies the main body and a relief valve actuator, enabling a user to activate the relief valve via the grip. The cap is configured to relieve pressure in a first stage of removal, and then unlock from the receptacle in a second stage of removal. A catch and secondary pressure relief features are provided to control removal of the cap. Magnets may be provided for proximity sensors to indicate proper closure of the cap on the receptacle.

Main technical features of a sealing mechanism of a pressure vessel provided by the invention are a sealing unit for airtightly combining with the vessel, and a combination unit for positioning the sealing unit in the airtight combination state, and there are common structures disposed between constituent elements of the sealing unit and the combination unit, so that the sealing unit and the combination unit can be combined with each other in order to facilitate use and storage and to avoid losing or missing parts.

A flexible connection device of a Type IV cylinder and a container frame, comprising a damping block, an anti-rotation block, a bushing, upper and lower clamping blocks (43, 44), and the like. The damping block cooperates with the anti-rotation block to flexibly control the circumferential rotation of the Type IV cylinder; and the bushing is combined with the upper and lower clamping blocks (43, 44) to limit the axial motion of the Type IV cylinder. For the feature that the interface of a boss and a plastic liner/composite overwrap is prone to premature failure, by allowing axial movement of one end of the Type IV cylinder in the container within a small range, a binding force borne by the cylinder during expansion/contraction is released, and the damping block is squeezed to consume energy.

Method, system, apparatus, and/or device to secure the vapor plug within the dewar. The vapor plug retention strap includes a first connector, a second connector and a main body. The second connector is configured to couple with the first connector. The main body is coupled in between the first connector and the second connector. The main body has a receptacle formed within that is configured to receive a neck of a vapor plug of a dewar and retain the neck of the vapor plug to secure the vapor plug within the dewar.

A pressure container includes a liner filled with gas inside, a reinforcement layer that is formed in contact with the outer surface of the liner by using a fiber reinforced resin and covers the liner from the outside, and a cap attached to the liner. The cap is formed into an annular shape, and includes a plurality of cap bodies that have engagement portions projecting toward the reinforcement layer and are arranged with intervals in a circumferential direction, and bridge portions that connect, in the circumferential direction, the cap bodies adjacent in the circumferential direction. The cap is attached to the liner in a state in which the bridge portions are deformed and the engagement portions of the plurality of cap bodies are engaged with the reinforcement layer.

A high pressure tank is equipped with a liner, a reinforcing layer laminated on an outer surface of the liner, and a cap joined to the liner and having a flow path through which a gas is capable of flowing. The liner and the cap are joined to each other by screw-engagement, and a connecting member (plate-shaped members, annular member) is disposed so as to straddle over the liner and the cap.

Methods, systems, devices and/or apparatuses for a vapor plug. The vapor plug includes a vapor plug cover or lid. The vapor plug cover or lid is configured to cover an opening of a container. The vapor plug includes a neck. The neck has a first end and a second end that is configured to be inserted into the opening of the container. The first end has a first diameter and the second end has a second diameter that is less than the first diameter.

Methods, apparatus, and device, for a cryogenic storage system that stores and/or transports a liquid or gas at a temperature below ambient temperature. The cryogenic storage system has an enclosure and a cavity. The cryogenic storage system has a dewar that is positioned within the cavity of the enclosure. The dewar has a payload area that is configured to hold a liquid below ambient temperature. The dewar is configured to hold a liquid below ambient temperature and passively stabilize in an upright position. The dewar is formed with an inner wall and an outer wall and has an opening that allows access to the payload area.

A cap includes a bottomed first cover portion, and a second cover portion provided on a receiving opening side of the first cover portion. The second cover portion includes an outside cover that covers a contact portion of a receptacle. The contact portion comes into contact with a distal end of a supply nozzle when the supply nozzle is connected with the receptacle. The outside cover has a tapered shape such that an outer diameter of the outside cover is decreased towards the first cover portion from one end of the cap where the receiving opening is provided. The outside cover has an internal dimension that allows the outside cover to be separated from an outer peripheral portion of the receptacle when the cap is attached to the receptacle.