Device and method to assess impairment of pipeline wall...

G - Physics – 01 – N

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Details

G01N 29/04 (2006.01) F16L 55/26 (2006.01) F16L 55/48 (2006.01) G01N 29/07 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2732937

The invention locates impaired sections of a pipeline, such as sections where the wall of the pipeline has been weakened or thinned. It provides a moveable device which passes through the pipeline and which has a first station. The moveable device has means to locate its position accurately. There is a second station, which is mounted either on the moveable device or in association with a fixed location on the pipeline wall. Either the first station or the second station has an acoustic or seismic pulse generator, and the other has a pulse receiver. The time taken for a pulse to travel from the pulse generator to the receiver is found to vary with the condition of the pipeline wall at the location where the moveable device is located at the time it receives (or sends) the pulse. The rate of change of velocity of the pulse as the device passes different locations in the pipeline is also found to vary with the condition of the pipeline wall at such location.

L'invention permet de localiser des sections dégradées d'une canalisation, telles que des sections dans lesquelles la paroi de la canalisation est affaiblie ou amincie. Linvention prévoit un dispositif mobile qui se déplace à travers la canalisation et qui comprend une première station. Le dispositif mobile comprend des moyens pour localiser sa position avec précision. Linvention prévoit également une seconde station, qui est montée soit sur le dispositif mobile, soit en association avec un emplacement fixe sur la paroi de canalisation. L'une ou l'autre de la première station et de la seconde station possède un générateur d'impulsion acoustique ou sismique, et l'autre station comprend un récepteur d'impulsion. Il savère que le temps mis par une impulsion pour se déplacer du générateur d'impulsion au récepteur varie selon l'état de la paroi de canalisation à l'emplacement où le dispositif mobile est situé lorsqu'il reçoit (ou envoie) l'impulsion. Il savère également que le taux de modification de la vitesse de l'impulsion, à mesure que le dispositif passe par différents emplacements dans la canalisation, varie selon l'état de la paroi de canalisation à un tel emplacement.

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