Cathodic corrosion prevention
Cathodic (or active) corrosion prevention is a technical process in which a potential reduction of corrosion is achieved with the aid of a cathodic current. At the level of around - 850 mV (which is referred to as the cathodic protection potential for a normal soil), the electrochemical corrosion process is almost entirely hold. The corrosion speed is reduced to a virtually negligible level of less than ten micrometer (0.010 mm) a year.
The FPI inspects cathodic corrosion prevention systems every three years (performance checks). During this procedure the precise settings and thresholds for the operator's periodical function inspections are also specified.
The inspection of the cathodic corrosion prevention systems are carried out according to the "C1 Guidelines for planning, execution and operation of cathodic protection of pipelines" of the Swiss Society for Corrosion Protection, SSCP.