Solutions for wind farms

Corrosion protection systems for wind farms

Our Cathelco corrosion protection systems based on impressed current cathodic protection (ICCP) technology have many advantages in comparison with the more traditional types of sacrificial anode systems. In addition to the being more economical to install, ICCP systems can be managed from a shore base, providing an easily verifiable way of knowing that they are giving reliable corrosion protection.

Read about our remote control and monitoring system

Lower installation costs

ICCP equipment and installation costs are significantly lower than that of sacrificial anodes. Because the ICCP equipment is much lighter than sacrificial anodes it can be positioned manually avoiding the use of cranes. Furthermore, the fixing points require much less time to install than those for sacrificial anodes.

Manageable from on-shore

At any time the performance of the system can be checked and controlled from an on-shore control room. It is also easy to monitor the system using a personal computer. If the environment below the waterline changes the ICCP system can be immediately adjusted to take account of this. Secondly, a record can be kept of the performance of the system demonstrating the integrity of the foundations. This avoids the time and expense of carrying out offshore surveys.

Sea bed penetration

ICCP systems have a much higher driving voltage than sacrificial anodes enabling the current to reach a depth of up to 5 metres below the sea bed (mudline). This extends corrosion protection to the buried foundations of the structure and combats microbiological influenced corrosion (MIC).

Lower weight/drag than sacrificial anodes

In a typical application 30 – 60 tonnes of sacrificial anodes and their mountings are replaced with just 1 tonne of ICCP equipment. Another important factor is that Cathelco’s surface mounted anodes present significantly less drag than the higher number of offset sacrificial anodes.

Lower maintenance costs

All of Cathelco’s offshore wind turbine anodes are ROV diver changeable saving time, effort and money when it comes to maintenance. The design life of the anodes is up to 30 years.

Suitable for all types of wind turbine foundations

  • Greater flexibility when positioning anodes and reference electrodes
    By mounting the anodes and reference electrodes externally, the problems associated with traditional cofferdam installations are eliminated.
  • Small anode footprint
    The tubular design of the ICCP element results in a very compact anode which combines a small footprint with a high current output.
  • Optimum anode distribution
    The ICCP anodes can be positioned more easily to achieve the optimum current distribution without the risk of ‘shading’.
  • Easier installation
    Anodes and reference electrodes are fitted using ‘self-torquing’ fastenings for speed and accuracy.
  • Control and data monitoring
    The system can be remotely controlled using Cathelco’s software and monitored via the Internet.

Digital modular control panels

The control panel supplies an impressed current which provides the driving force ‘potential’ which ensures protection of the whole subsurface structure. This protects nodes and extends beneath the mudline.

  • Proven robust design.
  • Low maintenance cost.
  • Control of corrosion by zones.
  • Compact size.
  • Local, hard wire or internet interfaces.
Read also about our Cathelco Thyristor control panel

Watch video introducing Cathelco corrosion protection systems for offshore wind turbine foundations