Page 12 - Gas_Plants

Source: GASCADE Gastransport GmbH

Cathodic protection

systems

Buried pipelines are costly investment objects with a long which is led into the ground via impressed current anodes.
service life. To prevent that pipelines are destroyed by The cathode is situated at the pipeline so that the protec-
corrosion, active and passive corrosion protection measures tive current flows from the anode via the ground to the
must be taken. However, even the slightest imperfection in imperfections. To monitor the effectiveness of the cathodic
the pipeline covering quickly causes local corrosion of the protection, the potential is measured by means of perma-
pipeline. This results in leakage which can cause enormous nent reference electrodes at the measuring points.
damage to material assets and the environment.
Due to the large interception areas of the pipelines and their
One way of preventing corrosion of the pipeline is direct galvanic connection to the cathodic protection rectifi-
impressed current cathodic protection. In this process, a er, lightning and surge protection measures are required to
cathodic protection rectifier generates a protective current prevent failure of the cathodic protection rectifier.

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