Pipe-to-water potential

SOUTHWEST CORROSION CONTROL was asked to evaluate the status of the cathodic protection being provided to large diameter, twin pipelines buried under the seabed in Georgia Strait. Cathodic protection is provided by a “constant current” rectifier. These rectifiers maintain a pre-set current output with changing tidal conditions.

For the evaluation, we measured both ‘On’ and’ Off’ potentials using data loggers to obtain the most accurate results. The photo shows the watercraft used to travel over the lines while measuring the pipe-to-water potentials.