CP Maintenance Services

Cathodic protection is an electrochemical technique of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode in the same cell. This method is used to control corrosion for steel structures such as underground pipelines, tanks, platforms, pile sheets, etc. A proper designed, installed, operated, and maintained CP systems shall mitigate corrosion by passing direct electric current (DC) to the metal surface. DC is discharged from the anodes installed in the electrolyte near the structure to be protected. By this way, corrosion is arrested when the DC is of sufficient magnitude and is evenly distributed over the surface of the structure to be protected.

 There are two types of Cathodic Protection: sacrificial anode, or passive, systems and impressed- current, or active, systems. Both types are widely used. CP maintenance is one of the most important activities necessary to ensure the long-term integrity of the bottom of above ground storage tanks. CP maintenance mainly consists of two activities; namely CP potential monitoring and CP system inspection. CP potential monitoring is conducted to evaluate the adequacy of CP level of above ground tanks bottom. Conducting a periodic tank-to-soil potential survey is one representative method of CP potential monitoring, and the results are evaluated with respect to the CP criteria based on tank-to-soil potential, such as (-0.850)VCSE polarized potential.

CP system inspection is conducted to determine the operating conditions of the CP equipment regarding rectifiers, periodic checks of output voltage and current. In case of protection failure, CP system repair is money saving compared with replacing the entire system. It is worth mentioning here that,
GTS has developed a well established procedure to provide complete maintenance and repair services to all types Cathodic Protection systems (CPs).

We carry out Re-installation of Deepwell Anodebeds, Replacement of Sacrificial Anodes, Maintenance of Test Lead Points and Monitoring of Cable Cuts to maintain the Integrity of CP Systems.