Patent ID: 7854241

Claim:
An insulating complex configured to be placed around a pipe having a longitudinal direction XX′, the complex comprising an insulating material confined in a partial vacuum in a case, said case comprising an inner wall and an outer wall, wherein: said inner and outer walls are made of rectangular or parallelogram-shaped metal strips, each having two parallel opposite end edges and two parallel opposite longitudinal edges; said inner and outer walls are sealed to each other, at least at said respective end edges defining opposite ends of said complex in said longitudinal direction XX′ after the complex is placed around said pipe; said two longitudinal edges of each of said inner and outer walls are either sealed to each other or sealed to the two longitudinal edges of the other of said inner and outer walls; and at least one of said inner and outer walls includes at least one corrugated zone having transverse corrugations extending in the longitudinal direction XX′ between said opposite ends of said complex in the longitudinal direction XX′.