Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1987-05-13
1988-12-13
Callaghan, Thomas F.
Pipe joints or couplings
With casing, lining or protector
Insulated
285351, F16L 2100
Patent
active
047905700
ABSTRACT:
An electrically insulated joint for metal piping having two receiving elements each having an opposing surface and defining a passage therebetween, at least one of the opposing surfaces having a non-recessed portion and a recessed portion that has an outer diameter smaller than an outer diameter of the non-recessed portion; an insulating ring having an outer diameter and being at least partially disposed against the recessed portion; an elastic sealing ring; and at least one leg disposed against the recessed portion to make the insulating ring impermeable to gas to thereby prevent high pressure build-up. The insulating ring is composed of a metal ring and one leg extending radially from the metal ring so that the insulating ring has an outermost diameter, and insulation material of high compression strength lining the insulated ring entirely. The elastic sealing ring has an inner diameter in a non-compressed state greater than the outermost diameter of the insulating ring. The insulating ring and the elastic sealing ring are compressed between the opposing surfaces. The one leg has an inner surface facing the elastic sealing ring and lying substantially in one common plane with the non-recessed portion.
REFERENCES:
patent: 495513 (1893-04-01), Pierce
patent: 2210833 (1940-08-01), Clough
patent: 3432186 (1969-03-01), Braun
patent: 3612578 (1971-10-01), Bagnulo
patent: 3612579 (1971-10-01), Groves
patent: 3937496 (1976-02-01), Zahid
patent: 4453899 (1984-06-01), Hiraga et al.
Dutch patent application No. 6919056, Jun. 16, 1978, 2 pages.
"Prochind" leaflet-4 pages.
"Evolution of Monolithic Insulating Joints", from the Pipe Line Industry magazine, Nov. 1977, 2 pages.
Angli Holding B.V.
Callaghan Thomas F.
Striker Michael J.
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