Method of manufacturing an improved conduit for conveyance of ho

Details Method of manufacturing an improved conduit for conveyance of ho Method of manufacturing an improved conduit for conveyance of ho

1977-04-06

1978-10-03

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

138144, 285187, B21D 3900

Patent

active

041175840

ABSTRACT:
A conduit for conveyance of hot fluids includes an inner tube, through which the fluid passes, made of a material having a low coefficient of thermal expansion, preferably less than 5 .times. 10.sup.-6 per .degree. C and advantageously INVAR .RTM. with a coefficient of 2.3 .times. 10.sup.-6 /.degree. C. The inner tube is anchored at its ends and has no expansion-compensating means in its length is surrounded by a binding wrapping of a material having a coefficient of thermal expansion greater than that of the inner tube, prestressed at the temperature of application to compensate for the relaxation of stress in the wrapping due to the different expansions of inner tube and wrapping, and so as to compensate at least in part for changes in stress on the inner tube resulting from the absence of expansion-compensating means. A longitudinal tensile pre-stress may also be applied. The assembly also includes thermal insulation, disposed either outside the wrapping or between the wrapping and the inner tube. An outer protective coating may constitute the binding wrapping.

REFERENCES:
patent: 2335038 (1943-11-01), Bridges
patent: 2373038 (1945-04-01), Lindsay
patent: 3078561 (1963-02-01), Szulc
patent: 3246394 (1966-04-01), Meyer
patent: 3377757 (1968-04-01), Magers
patent: 3630038 (1971-12-01), Ando
patent: 3788083 (1974-01-01), Lundgren
patent: 3810491 (1974-05-01), Hildebrandt
patent: 3932922 (1976-01-01), Thastrup

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