Abstract: Apparatus and method for producing reduction in maximum width in plastics lining pipes includes at least one pair of reducing rolls through which the lining pipe is forced from upstream thereof. The rolls are disposed and configured to present a roll throat of effective ovality, defined by the percentage difference between the maximum dimension normal to the axes of rotation and the maximum dimension parallel to the axes of rotation, in the range of 5% and 30%.

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.