Method of making a helically corrugated tube

Details Method of making a helically corrugated tube Method of making a helically corrugated tube

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B21K 21/00 (2006.01) B21C 37/20 (2006.01) B21D 11/14 (2006.01) B21D 15/04 (2006.01) B21D 53/06 (2006.01) F16L 55/00 (2006.01)

Patent

CA 1112031

METHOD OF MAKING A HELICALLY CORRUGATED TUBE ABSTRACT OF THE DISCLOSURE A helically corrugated tube with improved heat transfer characteristics is made by twisting a deformable tube of circular cross section and at the same time moving the ends of the tube axially relative to one another. First the tube is twisted while the axial ends of the tube are moved relatively toward each other to cause helical corrugations to develop progressively along the tube. When the corrugations have been formed, the twisting and moving of the ends of the tube are terminated and then the tube is reverse twisted and axially stretched to a length greater than the length of the original tube. The resulting tube is corrugated and longer than the original tube, and has improved heat transfer and fluid flow characteristics.

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