Method and article for forming field joints on pipe coated with

Details Method and article for forming field joints on pipe coated with Method and article for forming field joints on pipe coated with

1977-02-18

1978-06-20

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

428256, B29C 1906

Patent

active

040960170

ABSTRACT:
A method and article for covering and sealing the exposed weld joint area of a pipeline coated with thermoplastic corrosion protective coating is the subject of this application. The article comprises a layer of thermoplastic material that is compatible with the thermoplastic coating. A layer of mastic may also be formed on one side of the thermoplastic material. A resistance wire which is preferably a strip of wire mesh is tack welded or otherwise secured to the thermoplastic strip in two parallel stretches and a third stretch that is transverse to and in contact with the first two stretches. The article is wrapped around the coated pipe with the first two stretches of the resistance wire sandwiched between the pipe coating and the thermoplastic layer of the article and the third stretch of the resistance wire sandwiched between overlapping ends of the layer of thermoplastic material. The resistance wire is then energized to produce enough heat to fuse the two thermoplastic layers into an integral unit.

REFERENCES:
patent: 2930634 (1960-03-01), Merritt
patent: 3049465 (1962-08-01), Wilkins
patent: 3061503 (1962-10-01), Gould et al.
patent: 3506519 (1970-04-01), Blumenkranz

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