Abstract: A method of lining a main pipe and one or more service pipes extending therefrom is disclosed. The method comprises lining a main pipe with a liner of plastics material, inserting a liner of plastics material into a service pipe from an end of the service pipe remote form the main pipe and penetrating the wall of the main pipe liner to bring the main pipe into fluid communication with the service pipe. The wall of the main pipe liner is preferably penetrated by providing a pig or robot inside the lined main pipe, locating the position at which a service pipe is joined to the main pipe and using the pig or robot to cut, drill or pierce through the wall of the main pipe liner. A further lining portion may be provided along at least a part of any distance between the main pipe liner and the liner inserted into the service pipe. The further lining portion may be an insert of plastics material or may be provided by sealant with a channel formed therein or it may be formed by a combination of the two.

Abstract: A pipe leakage detection system which includes a flexible probe with a body portion of sufficient length to pass along a pipe. Pairs of seals define a seal volume with the inner pipe wall. An adjacent test region can be used to determine leakage. A source of fluid pressure is applied to lines. With equal pressure in both seal and test regions as indicated by a manometer no leak will occur around the seals. A deliberate outgoing flow rate is allowed from a line and any differential in flow, as detected by flow meters, will indicate an actual leakage rate.

Abstract: An acoustic temperature measurement system for pipeline fluids comprises a loudspeaker (16) with spaced microphone (18) in a sealed pipe (10) with end cap (11). A computer arrangement (22) provides a tone burst signal which drives the speaker via power amplifier (21) and the outgoing and reflected signal is detected by the microphone (18) and following amplification in amplifier (20) passes to the computer (22) for processing. The signals are processed to determine phase relationships indicative of temperature and can be used in correcting leakage measurement readings.

Abstract: A pipe leak testing arrangement which includes a device having sealing bags joined by a coupling. When inflated, the bags form a seal volume chamber. The bags may not form a perfect seal, and as a result leakage past the bags may occur when a differential pressure is present. A remaining portion of the pipe forms a test volume chamber. A first transducer measures differential pressure between the chambers and a further transducer measures the test chamber pressure. Measured pressure information is used by a control device to track pressure change and to adjust the seal pressure so as to maintain equal pressures even if the test pressure decays due to a pipe fracture. In an alternative arrangement, two separate devices with associated circuitry are provided to facilitate two temporary seal pressure chambers with the test chamber therebetween.

Abstract: A device and a method for pipeline leakage detection. A pipeline leak detector travels through the bore of a pipeline, applies a test pressure to a fluid contained within the pipeline, and measures the resultant rate of change of pressure in the pipeline by using back extrapolation of the test data to determine an initial pressure drop rate. The degree of leakage at a given position in the pipeline is then determined from the rate of change of pressure in the pipeline.