A method of lining a fluid conduit, apparatus for use in said method and a carrier for use in a fluid conduit.

摘要

A method of lining a main fluid conduit (l) having a branch conduit (2) and apparatus for use in the main conduit (l) includes a carrier (7) which is longitudinally displacable in the conduit (l). A portion (9) of the carrier (7) is rotatable above a longitudinal axis and carries a scissors-type extendible linkage (l0) having a platform (ll). By rotation of the portion (9), displacement of the carrier (7), and extension of the linkage (l0), service means on the platform (ll) can be maneouvred to be located in the branch conduit (2). The service means may be a water jet cutter (4) or a locating means (l5) having a chamber which is expandible by fluid pressure to engage the sides of the conduit (2) and be retained therein. The means (l5) includes a metallic part which a metal detector can detect through a lining which is fitted in the main conduit (l) to determine the position at which a port has to be cut in the lining to coincide with the branch conduit (2). Preferrably the chamber of the of the locating means (l5) is expanded by fluid pressure through a hose (20) and non-return valve so that the hose (20) disengages automatically at a predetermine pressure to isolate the locating means (l5) in the conduit (2) when the platform (ll) is withdrawn.