Pipe liner, a coiled liner product and methods for forming, inst

Details Pipe liner, a coiled liner product and methods for forming, inst Pipe liner, a coiled liner product and methods for forming, inst

1996-12-11

1998-09-22

Brinson, Patrick F.

Pipes and tubular conduits

Repairing

Patches

138 97, 264269, 264516, 156287, 156294, F16L 5516

Patent

active

058100539

ABSTRACT:
A thermoplastic liner is extruded in cylindrical form and deformed at a temperature below the crystallization temperature of the polyethylene material forming the liner into a generally W-shaped configuration. The liner in that configuration has three convex lobes and two concave lobes along one side of the liner with a convex portion of the liner wall along the opposite side. The cylindrical liner is initially extruded in cylindrical form and deformed by a series of axially spaced sets of rollers progressively inclined toward a vertical position wherein the final W-shaped configuration of the liner is formed. The liner has a cross-section in any direction less than one-half of the diameter of the liner when expanded into a cylindrical configuration. The deformed liner is coiled about a reel. At an installation site, the liner is pulled from the reel through the pipe and sealed at opposite ends. Steam under pressure expands the W-shaped liner to a cylindrical configuration to line the pipe.

REFERENCES:
patent: 4986951 (1991-01-01), Ledoux et al.
patent: 5034180 (1991-07-01), Steketee, Jr.
patent: 5091137 (1992-02-01), Ledoux
patent: 5265648 (1993-11-01), Lyon
patent: 5334429 (1994-08-01), Imoto et al.
patent: 5385173 (1995-01-01), Gargiulo
patent: 5397513 (1995-03-01), Steketee, Jr.
patent: 5487411 (1996-01-01), Goncalves

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