Electrode supporting conduit tube for electrical heating of unde

Details Electrode supporting conduit tube for electrical heating of unde Electrode supporting conduit tube for electrical heating of unde

1987-02-05

1989-01-17

Kittle, John E.

Stock material or miscellaneous articles

Composite

Of metal

428 345, 138145, B32B 1508, F16L 914

Patent

active

047987693

ABSTRACT:
An electrode supporting conduit tube for electrical heating of underground hydrocarbon resources comprises a metal conduit tube and an insulating member adhered on and around the outer peripheral surface of the metal conduit tube. The insulating member is a laminated body of a web of glass fiber impregnated with water-dispersion varnish of a hot-water resistant and thermoplastic resin and a polyether/ether/ketone resin film, which is formed by first alternately winding the glass fiber web and the resin film on and around the outer peripheral surface of the metal conduit tube for a plurality of winding turns, and then subjecting both polyether/ether/ketone resin film and glass fiber web thus wound on and around the metal conduit tube to shaping under heat and pressure at a heating temperature of from 350.degree. C. to 450.degree. C, and under a pressure of from 10 kg/cm.sup.2 to 200 kg/cm.sup.2.

REFERENCES:
patent: 3946809 (1976-03-01), Hagedorn
patent: 4192697 (1980-03-01), Parker et al.
patent: 4320224 (1982-03-01), Rose et al.
patent: 4360630 (1982-11-01), Smith
patent: 4394417 (1983-07-01), Hilker
patent: 4421588 (1983-12-01), Davies
patent: 4507468 (1985-03-01), Kawabata et al.
patent: 4528346 (1985-07-01), Sugie et al.
patent: 4577664 (1986-03-01), Takahashi et al.
patent: 4592782 (1986-06-01), Davies
1983-84 Modern Plastics Encyclopedia, p. 54 & p. 489.

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