Method of producing multiple-wall composite pipes

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

1980-02-25

1982-06-01

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Shaping by direct application of fluent pressure

29447, 29523, 138140, B23P 1700

Patent

active

043320732

ABSTRACT:
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, 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.

REFERENCES:
patent: 1955728 (1934-04-01), Allen et al.
patent: 1980156 (1934-11-01), Emrick
patent: 2986847 (1961-06-01), Sato
patent: 3064344 (1962-11-01), Arne
patent: 3068562 (1962-12-01), Long

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