Method of producing multiple-wall composite pipes

Details Method of producing multiple-wall composite pipes Method of producing multiple-wall composite pipes

B - Operations, Transporting

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B21K 21/00 (2006.01) B21C 37/15 (2006.01) B21D 26/02 (2006.01) B23P 11/02 (2006.01) F16L 55/00 (2006.01) F28F 19/06 (2006.01)

Patent

CA 1139923

ABSTRACT OF THE DISCLOSURE An outer pipe is diametrically expanded by heating and an inner pipe is diametrically contracted by cooling with a coolant introduced into the inner pipe to produce between the pipes a clearance just sufficient for insertion of the inner pipe into the outer pipe, and then the coolant is pressurized to expand the inner pipe against and together with the outer pipe 5 the pressure being removed after the pipes have expanded to a specific diameter of the joint therebetween. The tightness of the fit between the pipes due to the expansion is further increased by the subsequent thermal shrinkage of the outer pipe and thermal expansion of the inner pipe.

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