A method for checking the sealing of a sealed tank for storing a liquefied gas at low temperature, the tank having an inner hull and a secondary sealing membrane, a secondary space that is arranged between the inner hull and the secondary sealing membrane, a primary sealing membrane and a primary space that is arranged between the primary sealing membrane and the secondary sealing membrane is disclosed. The method has the following main steps: generating a pressure lower than the pressure of the primary space in the secondary space using a suction device, measuring the temperature of an outer surface of the inner hull, and detecting the location of a sealing defect of the secondary sealing membrane in the form of a cold spot on the outer surface of the inner hull.

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 sealed and thermally insulating tank intended for the storage of a fluid, the tank having a secondary insulating barrier having juxtaposed insulating panels; and a primary insulating barrier having insulating panels that are each arranged straddling at least four secondary insulating panels and anchored to the latter. The sealed tank is equipped with a through-element passing through a specific zone of the wall. In the specific zone of the wall, the longitudinal directions of the primary panels are perpendicular to the longitudinal directions of the secondary insulating panels. The through-element passes successively through an opening made in one of the secondary insulating panels and an opening made in one of the primary insulating panels.

A multilayer insulation is provided. The multilayer insulation includes a plurality of layers of material separated from one another by post elements. The interior of the integrated multilayer insulation can be filled with a selected gas. Moreover, the gas can be held in an interior volume of the integrated multilayer insulation at a pressure greater than ambient pressure, or flowed through the interior volume of the integrated multilayer insulation. The integrated multilayer insulation can be placed directly over an object to be insulated, or over a cellular insulation structure that is placed directly on the object to be insulated.

The invention relates to an insulation arrangement for a liquefied gas carrying ship wherein the ship has a primary barrier for containing a liquefied gas and a hull, and where the hull is spaced from said primary barrier to define a void between the hull and primary barrier. The hull is insulated with an insulation layer, said layer comprising a plurality of individual tessellating insulation panels.

A method and apparatus for storing liquid gases, such as liquid hydrogen, is provided. The liquid gas container includes multiple layers of insulation to enable non-vacuum insulation to be utilized while reducing cryopumping. An inner insulation layer is formed of a material which as a closed-cell structure and is thick enough such that the temperature at an outer surface of the inner insulation layer is greater than the boiling point of a gas within the outer insulation layer. The outer insulation layer may have an open-cell structure for the insulation material.

A storage and/or transport container for a cryogenic liquefied gas, the container having a double wall which is formed by an outer container and an inner container, the outer container surrounding the inner container, and the outer container having a cylindrical jacket-like metal wall region which, at mutually opposite ends, i.e., at a first end and a second end, transitions into domed metal wall regions, the wall thickness of the cylindrical jacket-like metal wall region increasing in the direction of the first and second end starting from a central portion which lies centrally between the first and second end. In the central portion, a reinforcement layer is fastened to the cylindrical jacket-like metal wall region and has a fiber-reinforced plastic. The invention also relates to a method for storing and/or for transporting a cryogenic liquefied gas, in which a storage and/or transport container is used.

Disclosed is a method for reducing the natural evaporation rate of an LNG storage tank. The method for reducing the natural evaporation rate of an LNG storage tank comprises the steps of: manufacturing an LNG storage tank including a primary insulation layer and a secondary insulation layer; connecting one end of a second vacuum hose to the secondary insulation layer; connecting the other end of the second vacuum hose to a vacuum pump; and actuating the vacuum pump so as to lower the internal pressure of the secondary insulation layer. The method enables the inside of the secondary insulation layer to be a vacuum, and thus lowers the moisture content of plywood included in the secondary insulation layer.

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 storage tank containing a fluid, the liquefaction temperature of which is lower than 50 C. under atmospheric pressure and having a cylindrical shape around an axis of revolution, the storage tank includes at least one thermal insulation barrier covered with a sealed and corrugated membrane which is made of a plurality of corrugations. These corrugations delimit a space between the corrugations and at least one thermal insulation barrier. The storage tank includes at least one system injecting gas into the space, the gas injection system including at least one circular pipe spreading around the axis of revolution of the storage tank and a nozzle linked to the circular pipe.