F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/13, 26/155
F16L 55/18 (2006.01) F16L 55/165 (2006.01) F16L 55/179 (2006.01) F16L 58/02 (2006.01)
Patent
CA 1335652
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. Methods and means for heating the pipe during insertion; for repairing short sections of conduit using a comparable section of the pipe, an inflatable bladder and a heat containment tube; for interconnecting and sealing newly installed thermoplastic pipes in a main conduit and intersecting service conduit; and for relieving longitudinal stresses in the thermoplastic pipe after installation, are also disclosed.
612808
Borden Ladner Gervais Llp
Nu-Pipe Inc.
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