There are significant differences between protecting FPSOs/FSOs and normal seagoing vessels against hull corrosion.

The most important is that FPSOs/FSOs generally remain on station for many years without drydocking. Therefore, it is an advantage if key components such as anodes and reference electrodes are diver changeable.

Another factor which needs to be taken into consideration is the ‘current drain’ caused by anchor chains.

In most cases PSOs and FSOs are supplied with forward and aft ICCP systems. Because the vessel is stationary when in operation, both of these systems have a similar output, generally in the region of 300amps.

Cathelco’s new range of C-Max anodes are diver changeable and emit a powerful current from a relatively small surface area. This means that fewer anodes are required and the number of hull penetrations is subsequently reduced. Features include self-snapping torque nuts which speed up the installation process.

Quantum control panels

The new range of Quantum control panels make ICCP systems easier to control and monitor. In addition to providing the power supply, they store comprehensive information about the performance of the system. An RS485 link enables this data to be relayed to a control room or bridge computer system. Another advantage is that the data can be uploaded to a USB stick and an emailed to Cathelco for analysis, avoiding the need to complete and return paper log sheets.


C-Max anodes – diver changeable

The key feature of C-Max anodes is that they are diver changeable – an important consideration for FPSOs with long dry docking intervals. Lightweight and easy to handle, they have a small footprint, but emit a relatively powerful current from a small surface area. They are fitted using self-torquing snap nuts, greatly reducing the time an effort taken by divers when replacement is carried out at sea.