Process for installing a pipe liner

Details Process for installing a pipe liner Process for installing a pipe liner

1996-09-17

1999-01-19

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Forming structural installations in situ

Uniting preform member with molding material

156287, 156294, 264516, 264230, 264269, 138 97, B29C 6334

Patent

active

058611169

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: 2204785 (1940-06-01), Bennett
patent: 4985196 (1991-01-01), LeDoux et al.
patent: 5265648 (1993-11-01), Lyon
patent: 5342570 (1994-08-01), LeDoux et al.
patent: 5395472 (1995-03-01), Mandich

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