Corrugated tube of strip-form thin plate - has corrugations with peaks and valleys running in plate longitudinal direction and plate wound in spiral welded or folded to form tube

摘要

The tube wall in section across the corrugation, and correspondingly across the plate longitudinal direction, has a corrugation pattern in the form of a periodically transversal wave curve (2) with alternating valleys and peaks in an XY plane. The X-direction is the wave curve extending direction and the Y-direction is the transversal direction in towards the tube interior. The tube wave curve within each period (T) comprises a value (3) with large amplitude (A) and a series of peaks (4) and valleys (5) with lesser amplitudes (a).