Galvanic corrosion resistant insulating pipe having excellent fi

Details Galvanic corrosion resistant insulating pipe having excellent fi Galvanic corrosion resistant insulating pipe having excellent fi

1993-01-06

1997-08-26

Gerrity, Stephen F.

Pipes and tubular conduits

Distinct layers

Bonded to each other

138149, 138DIG6, 285 54, F16L 914

Patent

active

056602111

ABSTRACT:
A low corrosion resistant pipe 1 is jointed with a high corrosion resistant pipe 2 directly or via a coupling 3. An insulating ceramic film having a thickness of 0.4 .mu.m and a resistivity of 10.sup.8 .OMEGA. cm or more is formed on the outer and inner surfaces of the pipes 1 and 2 at a length L of 60 mm or more from the end of the pipe and on the surface which forms a space when the pipes 1 and 2 are jointed at a coverage ratio of 90% or more to less than 100%.

REFERENCES:
patent: 4366971 (1983-01-01), Lula
patent: 4471017 (1984-09-01), Poeschel
patent: 4524996 (1985-06-01), Hunt
patent: 4530884 (1985-07-01), Erickson
patent: 4853297 (1989-08-01), Takahashi
patent: 4875713 (1989-10-01), Carstensen
patent: 4943489 (1990-07-01), Kuhara
patent: 5164230 (1992-11-01), Verspui
patent: 5277942 (1994-01-01), Ikegaya

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