Sealed tank with corrugated sealing membranes

A sealed tank comprising:

• adjacent first and second walls in respective intersecting first and second planes;
• each of the first and second walls including a corrugated sealing membrane;
• the sealing membrane of the first wall and the sealing membrane of the second wall joining at the level of an edge;
• the sealing membrane of the first wall including a first series of corrugations comprising parallel corrugations extending in a first direction and a second series of corrugations comprising parallel corrugations extending in a second direction intersecting the first direction;
• the first and second directions intersecting at the edge;
• the first direction in which the corrugations of the first series of corrugations extend and the second direction in which the corrugations of the second series of corrugations extend are perpendicular;
• the corrugations of the first series of corrugations and the corrugations of the second series of corrugations are spaced by the same inter-corrugation distance x;
• and the sealing membrane of the second wall including a third series of corrugations comprising parallel corrugations extending in a third direction intersecting the edge;
• the corrugations of the third series of corrugations being spaced by a constant inter-corrugation distance y;
• the tank further comprising a corner arrangement comprising a sealing membrane welded in a sealed manner to the sealing membrane of the first wall and to the sealing membrane of the second wall;
• the sealing member of the corner arrangement including:
• first corrugation deviation portions each including a corrugation that has a first end in line with one of the corrugations of the first series of corrugations and a second end in line with one of the corrugations of the third series of corrugations;
• and
• second corrugation deviation portions each including a corrugation that has a first end in line with one of the corrugations of the second series of corrugations and a second end in line with one of the corrugations of the third series of corrugations;
• the first corrugation deviation portions being interleaved with the second corrugation deviation portions along the corner arrangement;
• wherein the corrugations of the third series of corrugations that are connected to the first deviation portions are spaced from one another by a distance z1 equal to n1*y where n1 is an integer greater than 1;
• wherein the corrugations of the third series of corrugations that are connected to the second deviation portions are spaced from one another by a distance z2 equal to n2*y where n2 is an integer greater than 1 and different from n1;
• and
• wherein the angle θ° between the edge and the first direction satisfies the equation:
• θ
• =
• tan
• -
• 1
• ⁢
• n
• ⁢
• ⁢
• 2
• n
• ⁢
• ⁢
• 1
• .