As part of a front-end engineering design (FEED) study for a new-build floating production storage and offloading (FPSO) unit, we undertook a design review of the corrosion protection arrangements for the external hull, mooring turret and internal tanking.
Our objective was to appraise the existing design calculations, challenge the underlying assumptions as appropriate and provide expert guidance to the client on improvements to the design. By modelling the full 3D geometry using our in-house code, FNCorrosion, we were able assess the interactions between the hull-wide Impressed Current Cathodic Protection (ICCP) system, and local sacrificial anode-based corrosion protection systems fitted for the mooring turret and thrusters.
Modelling the corrosion protection systems throughout the design life of the platform, we were able to assess the original design, highlight areas for potential improvement and give our client confidence in the overall protection levels afforded to its vessel.
Prediction of the cathodic protection provided by a ship’s ICCP system