Abstract: A fluid pipe 1 is monitored using a distributed acoustic sensing (DAS) fibre 10 provided within pipe 1. The DAS fibre 10 is coupled at one end to a light emitter 101 and a light detector 102. The light emitter 101 emits light pulses into the DAS fibre. The light detector 102 detects backscattered light so as to provide an indication of the vibration experienced by each section of the DAS fibre 10 and thus of vibration characteristic of particular pipe events including leaks of the pipe 1. The DAS fibre 10 in a pipe 1 can also be used to locate the route of a buried pipe 1 by successively tamping the ground surface at a number of locations A-E in the vicinity of the suspected route of the pipe 1 and comparing the tamping vibrations detected from each location A-E.

Abstract: A pipe liner has an elongate duct of thin laminated thermoplastic layers and remains relatively flexible and folded to a flat form. In this form, opposing sides of the duct are pressed into close proximity aided by folding of the duct, so the liner can be stored efficiently. In use, the liner is inserted into a pipe. The liner is subsequently heated and pressed against the inner surface of the pipe to form a close fit. Once the liner cools, it sets in place providing a close fitting pipe lining. In order to ensure adequate and even heating of the pipe liner during installation, heating is provided within the liner. The heating may comprise: a plurality of conductive filaments; electromagnetic susceptor material; or a plurality of magnetic particles.

Abstract: A pipe liner has an elongate duct of thin laminated thermoplastic layers and remains relatively flexible and folded to a flat form. In this form, opposing sides of the duct are pressed into close proximity aided by folding of the duct, so the liner can be stored efficiently. In use, the liner is inserted into a pipe. The liner is subsequently heated and pressed against the inner surface of the pipe to form a close fit. Once the liner cools, it sets in place providing a close fitting pipe lining. In order to ensure adequate and even heating of the pipe liner during installation, heating is provided within the liner. The heating may comprise: a plurality of conductive filaments; electromagnetic susceptor material; or a plurality of magnetic particles.