Modernized cathodic protection system for legs of the production rig – Evaluation during ten years of service

• Published in: Ocean engineering 2020-12, Vol.218, p.108074, Article 108074
• Main Authors: Zakowski, K., Iglinski, P., Orlikowski, J., Darowicki, K., Domanska, K.
• Format: Article
• Language: English
• Subjects: Cathodic protection; Corrosion; Gas and oil production rig; Sacrificial anode; Sea platform
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2020.108074

The modernization of cathodic protection system of the Baltic Beta platform legs is described. It was that the sacrificial anodes cone-shaped groups were to be placed on the seabed at a depth of 80 m. The measurements results of cathodic protection effectiveness during its ten-years operation are presented. The effectiveness was assessed based on the potential value along the entire length of the legs from the sea surface to the seabed. The gained experience indicates that use of sacrificial anode systems mounted on the seabed can be an effective form of cathodic protection of offshore platforms legs. It is basically the only means of anticorrosion protection in case of a platform not able to leave its location for renovation works in a shipyard. •Anodes mounted on the seabed are an effective corrosion protection of the oil rig.•This system is the only protection means in case of a rig not able to leave its location.•Anode system located on the seabed can polarize rig legs even over a length of 80 m.•In some cases it is necessary to use additional anodes near the sea surface.