Abstract: An apparatus as disclosed for mounting a liquid-filled pipe by the use of ultrasound techniques. The apparatus comprises a vehicle capable of fitting inside the pipe, and of being transported along the pipe by the liquid flowing into it, together with rings of several ultrasonic transducers spaced circumferentially round the vehicle. The rings are so arranged that one ring operates in the reflection mode purely radially while two further rings operate as a pair in a longitudinal refraction mode. A fourth ring is used in a circumferential refraction/reflection mode. The vehicle has an associated power supply, data gathering and storage capability and a vehicle for measuring the distance traveled along the pipe.

Abstract: A method for lining a conduit with a deformable plastics liner pipe, the claimed method including deforming the liner along its length to a cross-section with reduced external dimensions relative To the dimensions of the undeformed liner and binding the liner by helically winding an elongate flexible element around the liner along its length to maintain it in the deformed cross-section. The method further includes drawing the bound liner into the conduit to be lined and releasing the binding to allow the liner to assume a cross-section substantially corresponding with the internal cross-section of the conduit. The elongate flexible element is supplied to the liner from a bobbin or the like through which the liner is passed in the deformed cross-section, the bobbin or the like being mounted for rotation around the liner as it passes therethrough to wind the elongate flexible element around the liner.