Abstract: A pipe liner for lining an existing pipe. The pipe liner includes a first elongated portion of plastic material and a second portion extending from the elongated portion with a flexibility which is greater than the elongated portion. The additional flexibility assist the liner in its insertion through an existing pipe.

Abstract: A measuring device for determining the thickness of a non-homogeneous medium such as the thickness of a road structure. The device includes a radar transmitter and two spaced receivers. Information on the timing of the transmitted signal as well as the signals received by the two receivers is used to calculate the material thickness while eliminating signal drift.

Abstract: A pipeline communication system. The system uses the pipeline and the adjacent ground and includes branches with junctions. Governor modules and transformers/rectifiers form part of the network. Monitors periodically provide information to the network controller. The system control receives information by way of an outstation to provide two-way communication and control using the pipeline and adjacent ground as conductors. Typically, the information in the form of fast frequency shift keying modulation is superimposed on the cathodic pipe protection system.

Abstract: A vibration monitor is provided which is worn on the wrist of an operative for an operating plant or apparatus. The monitor includes a piezoelectric transducer and associated circuitry which generates electronic digital signals during the periods when vibrations are experienced by the operative. Preferably, the plant or apparatus has a transmitter which transmits a code identifying the plant which is received by the monitor. Alternatively, the code may be entered manually. The monitor preferably includes a logger which can be connected to a host computer which data can be transferred over an external communications link. The logger includes a storage device for storing how long the operative is subjected to vibrations.

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 method of cleaning a pipeline for transporting a fluid without interrupting the fluid flowing through the pipeline, including applying suction to remove a mixture of the fluid and debris from the pipeline, separating the debris from the fluid, and re-injecting the fluid separated from the debris into the pipeline.

Abstract: An apparatus for sealing a clearance between a host pipe and a liner pipe. The liner pipe is fed into the host pipe and includes a tubular element forming a leading end of the liner pipe. It also includes a compressible seal which is adapted when compressed longitudinally to expand radially and is mounted on the tubular element when in use. The seal moves freely with the element in the direction of feeding of the liner pipe. But when the liner pipe is retracted counter to the direction of feeding, the seal movement is arrested and the seal compressed longitudinally by the element so that the seal expands radially to engage the internal wall of the host pipe and seal the clearance.

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.