US 7,112,254 B1 · Installation of cured in place liner with inner impermeable layer and apparatus

Abstract

A method for installation of a resin impregnated cured in place liner with an inner impermeable layer is provided. The liner is formed from a resin impregnable material having an impregnable layer bonded thereto. The material is formed into tubular shape with the impermeable layer on the outside of the tube about a tubular forming member and continuously everted into the tubular forming device to place the impermeable layer on the inside. An outer impermeable wrapping can be applied after wetting out the inner tubular member. A pull-in fitting with a steam connection is inserted into the leading end of the liner and the liner is pulled to an installation access. Prior to reaching the installation access a receiving canister with steam connection is attached to the end of the liner and pull-in completed. This permits inflation of the pulled in liner with an air curing of the resin with steam. All steaming is done below grade with minimal entry to underground access points.

Claims17

Dependent claims

A method for installing a resin impregnated cured in place liner having inner and outer resin impermeable coatings into an existing underground conduit from an installation access opening to a receiving access opening, comprising:

providing a length of liner suitable for the length of conduit to be repaired;
pulling the liner into the conduit from the receiving access opening towards the installation access opening to a predetermined distance from the end of the conduit at the installation access opening;
providing a receiving canister having an open installation end and a receiving end with a fluid outlet coupling;
installing the open end of the receiving canister into the trailing end of the liner;
continuing to pull the liner into the installation access opening so that the leading end of the liner is disposed in the installation access opening and the receiving canister is positioned at the end of the conduit at the receiving access opening;
connecting an inlet fluid supply line into the leading end of the liner in the installation access opening;
installing an exhaust line on the fluid outlet on the receiving canister;
feeding fluid into the liner to expand the liner against the wall of the conduit and pass through the liner and exit the exhaust line at the receiving access opening;
feeding heated fluid through the liner until the resin in the liner is cured;
cease feeding curing fluid;
and
allowing the liner to cool.

9 more elements

Dependencies are inferred from the claim text.

Installation of cured in place liner with inner impermeable layer and apparatus

Life of this patent

Installation of cured in place liner with inner impermeable layer and apparatus

Life of this patent

Abstract

Claims17