This high-pressure tank includes a resin liner constituting a hollow fluid filling part, a ferrule including a supply/discharge port which communicates with an internal space of the liner and a flange part which protrudes outward in a radial direction from a circumferential region of the supply/discharge port and abuts on the liner, and a reinforcing layer made of a fiber reinforced resin attached to cover across the liner and an outer circumferential surface of the flange part, in which a discharge hole allowing a gap between abutting surfaces of the flange part and the liner to communicate with an inside of the supply/discharge port and discharging a fluid accumulated between the liner and the reinforcing layer to the supply/discharge port is provided in the ferrule, and a trap groove surrounding a circumferential region of the discharge hole is provided on at least any one of the abutting surface on the flange part side and the abutting surface on the liner side.

The present invention relates to a pressure container for storing gases or liquids under pressures above 200 bar, comprising an elongate storage element having at least one rotationally symmetrical, preferably conical and/or cylindrical, central portion, a plurality (N) or number (N) of individual layers (n=1 to N) which each have at least one braided or wound reinforcing fibre, preferably at least two braided or wound reinforcing fibres, wherein the individual layers (n=1 to N) lie over one another in a local sequence along a perpendicular (S) to the axis of rotation of the central portion, and wherein an inner starting layer (n=1) surrounds a hollow body arranged within the storage element or forms said hollow body, and wherein an end layer (n=N) arranged above the starting layer (n=1) is provided, and wherein the reinforcing fibre or the reinforcing fibres in each of the individual layers (n=1 to N) has or have a layer-dependent fibre angle .sub.n relative to the axis of rotation projected into the respective individual layer (n=1 to N), wherein, proceeding from the starting layer (n=1) to the end layer (n=N), the angle differences .sub.n of the fibre angles .sub.n of two successive individual layers (n=1 to N1) are defined by the equation .sub.n=.sub.n+1.sub.n, where n=1 to N1, and, for at least 80%, preferably at least 90%, of all angle differences .sub.1 to .sub.N1, the condition .sub.n0 is met.

The present disclosure concerns a pressurized gas container, for example one containing carbon dioxide for use in a device or system for the preparation of a carbonated drink. The present disclosure also provides a plug that may be functionally integrated into the container and further provides a packaging with a plurality of such containers.

There is provided a method for constructing a cylindrical tank, including the step of assembling a metal inner tank by individually and sequentially conducting, on an internal side of a PC wall, raising of an inner tank lateral plate by a jack-up unit and welding of a next-stage inner tank lateral plate onto a lower section of the raised inner tank lateral plate, further including the step of installing a guide pair configured to sandwich the raised inner tank lateral plate onto the next-stage inner tank lateral plate that is to be welded therebeneath. As a result, in the case of adopting the jack-up construction system, it is possible to prevent an inner tank lateral plate from being attached next from falling.