Corrosion and Cathodic Protection Monitoring

Seatooth® wireless data transfer capability has been designed into corrosion monitoring systems to facilitate the harvesting of corrosion data. Minimizing threat to structural integrity resulting in mechanical failures. Sensors can be deployed for up to 30 years on both passive and active CP systems.

In salt water, steel structures are typically coated to protect them from corrosion. Those coatings might breakdown over time, be damaged during installation or service and it might not even be possible to reach all areas requiring protection. Additional measures need to be put in place to ensure integrity and protect from corrosion to those structures.

Cathodic protection (CP) is a technique used to control the corrosion of metal by making it the cathode of an electrochemical cell. In passive CP, protection comes from a “sacrificial” metal attached to the corrodible metal, to act as the anode.

All CP systems should be monitored regularly to ensure optimum performance. WFS have worked in partnership with Deepwater Corrosion Services and Stork Technical Services to monitor the effects of corrosion by monitoring CP performance wirelessly using Seatooth® technology.

Data can be recovered in real time over a wireless network or periodically with a diver or ROV, providing the maintenance team with time-stamped data and continuous charts showing the condition of the CP system for both preventive and diagnostic applications.

Benefits of wireless CP  monitoring:

  • Deployable in remote and inaccessible locations.
  • Flexible to retrofit – nodes do not require hard wiring into place.
  • No wires through splash zone.
  • Continuous data collection allows an accurate calculation of the end of life of an anode.
  • Optimum levels of CP are applied, based on actual conditions on the structure.
  • Provision of time-stamped condition data from the CP system – indicates when to apply retrofit or plan maintenance.