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Title

SONEX - Sonar Inservice Pipe Inspection

Description

Sonar is used to map the ocean floor, to find sunken ships, and by submarines with the familiar ping echo sound. Hearing your voice echo is an example of sound traveling through the air, bouncing off a surface, and returning to your ear. The amount of time between shouting "hello" and hearing your own echo can be measured. The speed of sound in air and water is known... and time multiplied by speed equals distance. This principle provides the basis for the Sonic Caliper(TM) inspection of pipelines.

A rotating Sonar Transducer is ruggedly housed with electronics and mounted on a sled or float vehicle. The Sonic Caliper(TM) is then pulled through the pipeline, scanning and recording the interior corrosion and debris conditions via wire line cable to a control computer in the main logging truck. Real time measurements are displayed as the inspection is underway.

Scanning in motion results in each rotation of the Sonar Transducer representing a spiral shaped cross section measurement of the pipe. Together, the spin rate and the traverse rate determine the longitudinal coverage for the system. Often these are set to provide one cross section per foot of travel. Slowing the traverse rate increases the number of cross sections per foot. As the Sonar Transducer spins, the electronics are programmed to pulse the Sonic Beam at various rates. The rate is chosen at the highest rate possible for a given pipe size and medium... air or water. This pulse rate is generally 120 radial measurements per 360 degrees. The number of measurements for a given arc is controlled by programming the rotating speed of the Sonar Transducer, the electronics and the travel time of the sonic beam.

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