Tightening layer on insulated pipe lines

摘要

The invention relates to an expansion absorbing tightening layer for insulated pipe lines, which layer is applied outside the insulation of a pipe line. In accordance with the invention, the layer consists of steel plates, the longitudinal edges of which are welded together by means of longitudinal seam welds. The end edges of the plates are welded together by means of transverse seam welds. The welds are made in outwards folded flanges in such a manner that the joints of the plates are resiliently flexible in a direction transverse of the joints of the plates. When the layer in the longitudinal direction of the pipe line consists of sections, each section consists of two equal semicylindrical shells. The longitudinal folded flanges of successive sections may be shifted in such a manner that they do not abut upon each other.