Expandable metal membrane with orthogonally isotropic behavior

Abstract

In a metal membrane for a low-temperature-fluid storage tank wherein longitudinal and transverse corrugations are formed and both corrugations intersect each other, a bidirectional expandable member connected to each corrugation is formed in the intersection of the corrugations so that the bidirectional expandable member is longitudinally and transversely expandable. The bidirectional expandable member is protruded and is shaped like a pyramid, a dome or a cross. Each metal membrane is welded into a unit panel and the edge of each metal membrane is welded with the common edge of another adjacent metal membrane.

1 . A metal membrane with having orthogonally isotropic behavior in a metal membrane of a low-temperature-fluid storage tank having longitudinal and transverse corrugations which intersect each other, wherein:
 a bidirectional expandable member connected to each corrugation is formed so that the bidirectional expandable member is longitudinally and transversely expandable at an intersection of the corrugations;   the bidirectional expandable member is protruded in a pyramid shape, and first caved grooves are formed at corners where lateral faces of the bidirectional expandable member are connected;   second caved grooves are formed on a top part of the portion connected with the bidirectional expandable member in the corrugations; and   clamping parts protruded to be clamped by a clamping unit are formed at both ends of the corrugations connected to the bidirectional expandable member.   
     
     
         2 . The metal membrane having orthogonally isotropic behavior of  claim 1 , wherein the upper part of the clamping part is more protruded than the bottom part of the clamping part. 
     
     
         3 . A metal membrane having orthogonally isotropic behavior in a metal membrane of a low-temperature-fluid storage tank having longitudinal and transverse corrugations which intersect each other, wherein:
 a bidirectional expandable member connected to each corrugation is formed so that the bidirectional expandable member is longitudinally and transversely expandable at an intersection of the corrugations;   the bidirectional expandable member is protruded in a dome shape;   a neck part is formed at the portion where the bidirectional expandable member is connected in the corrugations; and   clamping parts indented to be clamped by a clamping unit are disposed at either sides of the bidirectional expandable member between portions where the bidirectional expandable member and the corrugation are connected.   
     
     
         4 . A metal membrane having orthogonally isotropic behavior in a metal membrane of a low-temperature-fluid storage tank having longitudinal and transverse corrugations which intersect each other, wherein:
 a bidirectional expandable member, protruded in a cross shape and connected to each corrugation between branching parts of the cross shape, is formed so that the bidirectional expandable member is longitudinally and transversely expandable at an intersection of the corrugations; and   clamping parts are formed in such a way that the clamping parts are clamped by a clamping unit at either lateral face of the branching parts by having the bidirectional expandable member protrude over the corrugations.   
     
     
         5 . The metal membrane having orthogonally isotropic behavior of  claim 4 , wherein a side shape of the bidirectional expandable member is a fan shape.