Pipeline operators must confirm that pipelines and other buried metal structures such as tanks and vessels, are protected cathodically against corrosion.
Although not usually taken as frequently as at the rectifier, measurements at CP test points are only spot checks. Again, they only indicate problems well after they have occurred and have no alarm capability. By contrast, MERLIN CP Monitors provide an immediate indication of CP levels at the important points in the pipeline network.
In a well maintained CP system all points should be tested periodically but “key posts” should be monitored more intensively, including: