An internal bottom wall of the double hull bears a sump structure comprising a rigid container arranged through the thickness of the bottom wall of the tank and intended to accommodate a suction member of a pump. The rigid container comprises a bottom wall situated at a level further toward the outside than the secondary sealing membrane of the bottom wall of the tank. The sump structure comprises a primary connecting plate surrounding the container, the primary connecting plate having a connecting surface extending parallel to the primary sealing membrane of the bottom wall of the tank, the primary sealing membrane of the bottom wall of the tank being attached in a sealed manner to the connecting surface all around the sump structure.

A method of forming a thick wall section on a specific region of a thin wall spinformed metallic tank shell includes forming a thin wall metallic tank shell blank by spinforming a metal sheet over a mandrel and removing the tank shell blank from the mandrel. The method further includes mounting the blank in an additive manufacturing system and adding metallic structural features to the tank shell according to a 3D model stored in memory in the additive manufacturing system.

A gas tank includes: a liner including a tubular body portion having a central axis and a dome portion being located at each of two ends of the body portion; and a reinforcing layer covering the outer periphery of the liner. The reinforcing layer includes at least one a first fiber layer. The first fiber layer includes, on an outer periphery of the body portion, a first reinforcing portion and a second reinforcing portion. The first reinforcing portion is a portion in which fibers are wound in a staggered weave pattern, and the second reinforcing portion is a portion in which the fibers are wound at a predetermined angle with respect to the central axis.

A production control system for a hydrogen storage tank includes: an operating unit, a design terminal, and a processor. The processor may be communicatively connected to the operating unit and the design terminal, respectively. The design terminal may be configured to operate a finite element simulation command stored in a storage unit. The processor may be configured to obtain the target laying parameter from the design terminal, generate an operation command based on the target laying parameter, send the operation command to the winding mechanism; and determine whether to generate an optimization command. In response to a determination of generating the optimization command, the optimization command may be generating and sent to at least one of the operating unit, the monitoring unit, and the design terminal.

A gas tank comprises: a liner including a cylindrical body part, and a dome part, provided at each opposite ends of the body part; and a reinforcing layer covering an outer periphery of the liner. The reinforcing layer includes: at least one first fiber layer including a first reinforced section provided on an outer periphery of the body part, the first reinforced section being formed by winding fibers in such a manner that the fibers are interlaced with each other; and at least one second fiber layer including a second reinforced section provided on the outer periphery of the body part, the second reinforced section being formed by winding fibers at an angle determined in advance relative to a center axis of the liner.

A double-walled tank comprising at least one connection system connecting the outer and inner enclosures and enabling them to move in relation to one another in at least a longitudinal direction parallel to an axis of displacement when in operation. The connection system has an annular linear connection between a first contact surface rigidly connected to the outer enclosure and a second contact surface rigidly connected the inner enclosure, the first and second contact surfaces arranged opposite one another and configured to be in contact with one another along a contact circle that has a center positioned on the axis of displacement.

A tank valve device has a valve block provided in an opening of a tank, a valve that is attached to the valve block, a nozzle head that extends along an axial line and is attached to the valve block and arranged inside the tank, and a temperature sensor that measures fluid temperature in the tank, and the nozzle head has a filling line that flows fluid to be filled into the tank, and the temperature sensor is inserted through the nozzle head.