Importance

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Abstract

A method and apparatus for lining a pipe with a polymer liner in which the liner is pulled through a die to reduce the liner's diameter and through the pipe and on removal of the pulling load, allowing the liner to revert to at least the minimum internal diameter of the pipe, wherein the liner has a maximum diameter before entering the die and a minimum diameter in the die. The die having an aperture which is symmetrical with respect to a central, longitudinal axis and comprising in the direction that the liner is passed an entry, a throat and an exit. The diameter of the aperture decreasing over the entry to a minimum to the throat and increasing over the exit. The entry of the die, when viewed in a sectional plane extending longitudinally of the liner and containing the axis, is convex over substantially an entire axial length between where the liner first contacts the die and the throat, wherein the liner substantially continuously engages the die over substantially the entire axial length.

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First Claim