Method of mechanically prestressing a tubular apparatus

Details Method of mechanically prestressing a tubular apparatus Method of mechanically prestressing a tubular apparatus

B - Operations, Transporting

21

C

205/2, 205/37

B21C 9/00 (2006.01) B21C 37/15 (2006.01) E21B 17/00 (2006.01) E21B 36/00 (2006.01) F16L 9/18 (2006.01)

Patent

CA 1211077

ABSTRACT OF THE DISCLOSURE A method of prestressing a tubular apparatus having coaxial inner and outer tubes which are connected to each other at axially spaced locations comprises, after the inner and outer walls are connected to each other and the tube is heat-treated or otherwise processed, reducing the diameter of the outer wall so that the outer wall is elongated. The elongation of the outer wall establishes a prestressed condition between the inner and outer walls with the inner wall under tension and the outer wall under compression. The reduction in diameter of the outer wall can be accomplished by using a roll extrusion machine a tube reducer or a draw bench.

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