Abstract: A method and apparatus for making a pipe liner and the pipe liner itself. A thin walled pipe liner, after being provided cooled from a spool or extruded in tubular form and cooled, is deformed to a smaller cross section at ambient temperature. The pipe liner is then encased and held in its reduced cross section deformed shape by a protective sleeve which is co-extruded directly over the pipe liner. The sleeved pipe liner may then be wound on a drum for transport to a remote location. Ducts for water may pass through the pipe liner. Other ducts, for example, for fiber optics, may pass through the sleeve either within or outside of the deformed pipe liner.

Abstract: An apparatus for deforming a pipe includes a boxed structure having an entry and exit for the pipe. The boxed structure acts as a constraint on a peripheral of the pipe along a path of movement thereof. An elongate wedge member depends inwardly from the boxed structure and is arranged in use to lie alongside the path of movement of the pipe and to project increasingly into the pipe as the pipe moves past the wedge member in a forward direction in the path of movement. The pipe to be deformed in the path of movement is engaged progressively increasingly by the wedge member whereby to indent progressively a part of the peripheral wall of the pipe such to deform the pipe longitudinally in the path of movement with the pipe through the boxed structure.

Abstract: A conduit is lined by pressing a liner into contact with the conduit and making it self-supporting. It is transported to the working site (at which its two ends are not at manholes or excavations entering the conduit) on a core with an inflator bag. The core can be made flexible to assist entry to the conduit and rigid to provide transport along the conduit. The bag is inflated at the site to press the liner into contact with the conduit. The liner is made self-supporting by curing an impregnating resin or by sticking it to the conduit. The bag is deflated and the core is removed. The bag may have a limited response to inflation pressure so it does not balloon into voids in the conduit wall. It may have a progressive response to inflation pressure so that it expands from its mid-point towards its ends.