Method of installing a new pipe inside an existing conduit by pr

Details Method of installing a new pipe inside an existing conduit by pr Method of installing a new pipe inside an existing conduit by pr

1991-07-22

1993-09-14

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

156287, 156294, 264 36, 264269, 264230, 264573, B29C 6334

Patent

active

052446247

ABSTRACT:
A thin, flexible tubular membrane provides a heat containment tube for inserting into and inflation within an underground conduit to be repaired. Folded rigid thermoplastic pipe is inserted into the tube while hot and flexible. The tubular membrane is pressurized to exclude unwanted fluids from within the existing conduit. Hot steam is injected into the tube to heat the pipe full-length externally and internally until flexible. The pipe is then rounded and expanded against the walls of the conduit with the tube therebetween. The rounding and expanding of the pipe is carried out progressively by moving a plug through the pipe and by injecting hot steam under pressure behind the plug.

REFERENCES:
patent: 2794758 (1954-09-01), Harper et al.
patent: 3080269 (1963-03-01), Pollock et al.
patent: 4273605 (1981-06-01), Ross
patent: 4627471 (1986-12-01), Parkes et al.
patent: 4643465 (1987-02-01), Green et al.
patent: 4744842 (1988-05-01), Webster et al.
patent: 4950446 (1990-08-01), Kinumoto et al.
patent: 4985196 (1991-01-01), LeDoux et al.

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