A vacuum heat-insulating material includes: an outer cover material; and a core material which is sealed in a tightly closed and decompressed state on the inside of the outer cover material. Outer cover material has gas barrier properties and satisfies at least one of a condition that a linear expansion coefficient is 80×10.sup.−5/° C. or lower when a static load is 0.05 N within a temperature range of −130° C. to 80° C., inclusive, a condition that an average value of a linear expansion coefficient is 65×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −130° C., inclusive, a condition that an average value of a linear expansion coefficient is 20×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −110° C., inclusive, and a condition that an average value of a linear expansion coefficient is 13×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of +50° C. to +65° C., inclusive.

A vacuum heat-insulating material includes: an outer cover material; and a core material which is sealed in a tightly closed and decompressed state on the inside of the outer cover material. Outer cover material has gas barrier properties and satisfies at least one of a condition that a linear expansion coefficient is 80×10.sup.−5/° C. or lower when a static load is 0.05 N within a temperature range of −130° C. to 80° C., inclusive, a condition that an average value of a linear expansion coefficient is 65×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −130° C., inclusive, a condition that an average value of a linear expansion coefficient is 20×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of −140° C. to −110° C., inclusive, and a condition that an average value of a linear expansion coefficient is 13×10.sup.−5/° C. or higher when a static load is 0.4 N within a temperature range of +50° C. to +65° C., inclusive.

The invention relates to a method for managing maintenance for a ship comprising a sealed and thermally insulating tank for transporting liquefied gas. The method comprises the steps consisting in determining 310 a current filling level of the tank, determining 320 a current state of movement of the ship, determining 330 a current sloshing index IBi from the current filling level of the tank and the current state of movement of the ship, taking into account the position and the geometry of the tank, integrating 340 the determined current sloshing index IBi into a wear index IUi that takes into account a history of the sloshing indices. The wear index is then compared to a threshold in order to indicate if the tank needs to be inspected, depending on the result of the comparison.

The invention relates to a method for managing maintenance for a ship comprising a sealed and thermally insulating tank for transporting liquefied gas. The method comprises the steps consisting in determining 310 a current filling level of the tank, determining 320 a current state of movement of the ship, determining 330 a current sloshing index IBi from the current filling level of the tank and the current state of movement of the ship, taking into account the position and the geometry of the tank, integrating 340 the determined current sloshing index IBi into a wear index IUi that takes into account a history of the sloshing indices. The wear index is then compared to a threshold in order to indicate if the tank needs to be inspected, depending on the result of the comparison.

A corner structure comprises: a fixed member fixed to a corner of a storage tank; a movable member supported on the fixed member so as to be linearly movable; a stop member attached to the fixed member to prevent the movable member from being detached from the fixed member; and a heat insulating member disposed between a sealing wall and a hull. The fixed member comprises a guide portion provided with a guide recessed portion, the movable member comprises a guide protruding portion inserted into the guide recessed portion, and the width and the length of the guide protruding portion are smaller than the width and the length of the guide recessed portion, so that the movable member can be supported on the fixed member to be movable in the longitudinal direction and in the direction perpendicular to the longitudinal direction.

A corner structure comprises: a fixed member fixed to a corner of a storage tank; a movable member supported on the fixed member so as to be linearly movable; a stop member attached to the fixed member to prevent the movable member from being detached from the fixed member; and a heat insulating member disposed between a sealing wall and a hull. The fixed member comprises a guide portion provided with a guide recessed portion, the movable member comprises a guide protruding portion inserted into the guide recessed portion, and the width and the length of the guide protruding portion are smaller than the width and the length of the guide recessed portion, so that the movable member can be supported on the fixed member to be movable in the longitudinal direction and in the direction perpendicular to the longitudinal direction.

Disclosed is a pump tower disposed inside a liquefied gas storage tank so as to supply or discharge liquefied gas to/from the inside of the liquefied gas storage tank. The pump tower, according to one embodiment of the present invention, comprises: a discharge pipe used for discharging the liquefied gas in the liquefied gas storage tank; an emergency pipe equipped with an emergency pump at the lower end thereof; a charge pipe for supplying the liquefied gas into the liquefied gas storage tank; and a support, which is provided on the bottom of the liquefied gas storage tank, for enabling the vertical displacement of the pump tower and restricting the horizontal movement and rotation thereof. The support comprises: a lower body fixed to a hull side; an upper body fixed to a pump tower side; and a wedge member interposed between the lower body and the upper body.

A container ship and a layout structure thereof are disclosed. In the layout structure of the container ship of the present invention, an engine room, in which a propulsion engine receiving LNG as fuel is provided, is disposed under a main deck at the stern of the container ship, an LNG storage tank storing the LNG is disposed in a cargo hold adjacent to the engine room, a fuel supply part for receiving the LNG from the LNG storage tank and supplying the LNG to the propulsion engine is disposed right above the LNG storage tank inside the cargo hold, and a void space isolating the LNG storage tank and the fuel supply part from each other is disposed therebetween.

A container ship and a layout structure thereof are disclosed. In the layout structure of the container ship of the present invention, an engine room, in which a propulsion engine receiving LNG as fuel is provided, is disposed under a main deck at the stern of the container ship, an LNG storage tank storing the LNG is disposed in a cargo hold adjacent to the engine room, a fuel supply part for receiving the LNG from the LNG storage tank and supplying the LNG to the propulsion engine is disposed right above the LNG storage tank inside the cargo hold, and a void space isolating the LNG storage tank and the fuel supply part from each other is disposed therebetween.

To obtain an economical hull structure by employing an independent prismatic tank having a large tank volume with respect to a ship size and reducing material cost.

Provided is a LNG ship having a structure in which a substantially prismatic tank is installed inside a hold while not being integrated with a hull structure material, wherein a tank bottom surface is provided with inclined surfaces formed at the left and right sides of a center line direction of the ship as a boundary so that each angle intersecting a horizontal line becomes equal to or smaller than 4.0°, and support bodies integrated with the hull structure material are arranged so as to correspond to the inclined surfaces and the tank is put on the support bodies.