Method of lining a pipe
View Patent ↗A cured in place liner system and associated connections and methods are disclosed. The cured in place pipe system forms a completely rehabilitated, stand-alone, fluid-tight flow path between upstream and downstream portions of an existing pipe system. The rehabilitated flow path is stand-alone in that the liner system does not rely on structure of the portion of the pipe system through which the liner system is installed to define the fluid-tight flow path. The flow path between upstream and downstream portions of the liner system is defined by and made fluid-tight solely by components of the rehabilitation system such as cured in place liners and couplers. The portion of the pipe system through which the rehabilitation system is installed merely provides a path (e.g., through the ground) through which the cured in place liner system can be inserted. After the cured in place liner system is installed, the liner system forms a fluid-tight flow path between an upstream portion of the pipe system and a downstream portion of the pipe system. Various types of connections may be used. In addition, various types of methods may be used in forming the connections, such as using a mold to cure connecting sections of the cured in place liners in desired configurations (e.g., having a generally circular outer profile) for forming connections with the liners.
1. A method for installing a liner impregnated with a curable resin in a previously installed host pipe, the method comprising:
positioning a sleeve which is separate from the pipe at an end of the pipe;
positioning the liner in the pipe so a connecting section of the liner extends into the sleeve; and
curing the liner whereby the connecting section of the liner bonds with the sleeve to form a coupling section extending out of the pipe and configured to have a coupler mounted thereon for connecting the liner in fluid communication with another pipe.
2. A method as set forth in claim 1 wherein the liner and sleeve are configured to cure together so that the sleeve is an integral part of the liner after curing.
3. A method as set forth in claim 2 wherein the liner and sleeve comprise the same material.
4. A method as set forth in claim 1 wherein the sleeve has sufficient rigidity to maintain its tubular shape before the step of curing the liner.
5. A method as set forth in claim 1 wherein the sleeve and the pipe have interior lumens defining inner diameters of substantially equal size and the step of positioning the sleeve comprises orienting the sleeve so that the interior lumen thereof is substantially aligned with the interior lumen of the pipe.
6. A method as set forth in claim 1 wherein said step of positioning the liner comprises positioning the liner to conform to an inside surface of the host pipe.
7. A method as set forth in claim 1 wherein said step of positioning the liner comprises positioning the liner to conform to an inside surface of the sleeve.
8. A method as set forth in claim 1 wherein said step of positioning the liner comprises extending the liner through the sleeve.