Method of joining lined pipes

Details Method of joining lined pipes Method of joining lined pipes

1999-06-18

2001-05-08

Hughes, S. Thomas (Department: 3726)

Metal working

Method of mechanical manufacture

Assembling or joining

C285S055000, C285S054000, C228S044500

Reexamination Certificate

active

06226855

ABSTRACT:

This invention relates to a method of joining pipes lined with corrosion resistant plastics material.
Carbon steel pipelines are provided with liners of corrosion resistant plastics material so that the pipeline can be used to convey aggressive media. The provision of such liners avoids the need to use expensive stainless steel pipes.
An object of the invention is to provide a method capable of being used to provide a corrosion resistant barrier internally across a joint between two adjacent pipes each internally lined with corrosion resistant plastics material.
According to the invention a method of joining pipes lined with corrosion resistant plastics material comprises providing a first outer pipe lined by a first lining pipe of corrosion resistant compressible plastics material having an end face spaced internally of the first outer pipe from an end of said first lining pipe whereby said first outer pipe and said lining pipe combination has a first counterbore adjacent to said end of the first outer pipe, providing a tubular bridging-member of plastically deformable, corrosion resistant ductile material, said bridging-member comprising a tubular first end portion and an opposite tubular second end portion each extending in an opposite direction to the other from an intermediate tubular portion having an external diameter greater than that of the first or second tubular end portion and an internal diameter greater than that of first or second tubular end portions, introducing said first tubular end portion of the bridging-member into said first lining pipe and said intermediate portion into said first counterbore, providing a second outer pipe lined by a second lining gripe of corrosion resistant compressible plastics material having an end face spaced internally of the second outer pipe from an end of said second outer pipe whereby said second outer pipe and said second lining pipe combination has a second counterbore adjacent said end of the second outer pipe, introducing said second tubular end portion of the bridging-member into said second lining pipe and said intermediate portion into said second counterbore whereby said ends of the first and second outer pipes are adjacent, at a time after said first tubular end portion is introduced into said first lining pipe expanding the first tubular end portion transversely to its tube axis so as to press the first tubular end portion into the first lining pipe which is compressed between the first outer pipe and said first tubular end portion, at a time after said second tubular end portion is introduced into said second lining pipe expanding the second tubular end portion transversely to its tube axis so as to press the second tubular end portion into the second lining pipe which is compressed between said second outer pipe and said second tubular end portion, and at a time after said ends of the first and second outer pipes are brought into adjacency said outer pipes being joined together externally of said lining pipes.
Each outer pipe may be of metal, for example a ferrous metal. The ferrous metal may be steel, for example carbon steel.
Each lining pipe may formed of thermoplastic plastics material.
Each lining pipe may be formed of a polyolefin, or a polyethylene, or a polyvinylidene fluoride.
A said lining pipe may be inserted into a said outer pipe by first compressing the outer diameter of the lining pipe, then drawing the lining pipe into the outer pipe and allowing the lining pipe to resile or re-expand to substantially its original external diameter so as to fit relatively closely against the inner wall of the outer pipe.
The bridging-member may be formed of a corrosion resistant metal, for example brass or stainless steel.


REFERENCES:
patent: 2216839 (1940-10-01), Hoffman
patent: 4355664 (1982-10-01), Cook et al.
patent: 4432824 (1984-02-01), Cook et al.
patent: 4708375 (1987-11-01), Sauer
patent: 5348211 (1994-09-01), White et al.
patent: 5992897 (1999-11-01), Hill et al.
patent: 0366299A2 (1990-05-01), None
patent: 0366299 (1990-05-01), None

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