Pipes and tubular conduits – Repairing
Patent
1987-12-24
1989-01-10
Marcus, Stephen
Pipes and tubular conduits
Repairing
2940201, 405154, 405184, F16L 100
Patent
active
047966734
ABSTRACT:
A reproduction process for an existing pipeline whether underground or overground includes the inserting of at least one rigid inner pipe having its front end temporarily blocked, and advancing the rigid inner pipe within the existing pipeline by means of fluid pressure applied to the interior of said inner pipe, or to the end of said inner pipe. Preferrably a rust-proof binding substance between the inner pipe and the existing pipeline is provided to unify the two pipes and provide a new integral pipeline. The new rigid inner pipeline may be made in sections which may be welded together as they are being inserted and are preferrably provided with bumps or projections around the external surface of the new rigid inner pipe in a spiral form.
REFERENCES:
patent: 4314577 (1982-02-01), Brister
patent: 4640313 (1987-02-01), Stanley
patent: 4648746 (1987-03-01), Abinett
Marcus Stephen
Taisei Corporation
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