From galvanic anodes to ICCP system for offshore jackets revamping

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Sacrificial or Galvanic Anodes Cathodic Protection System is an excellent anticorrosion solution which offers to immerse structures a long-term protection. In TotalEnergies and in the Oil & Gas Industry in general, such system provides confidence, efficiency together with little maintenance over years which is a very good point for the subsea integrity of jackets (or pipelines) when knowing all other operational constraints or corrosion issues that can be met at the surface level.

Thus, from TotalEnergies experience, it has been established that as long as:1/ the CP system is correctly designed (taking into account the applied - or not - painting on the jacket) following the recognized international codes and standards (DNV RP-B-401, ISO 15589-2.

Product Number: 51323-19177-SG

Author: Eric Agel, Mamady Obame-Diakite, Thiago Mesquita, Christian Yogoulou-Joly

Publication Date: 2023

Member Price: $0.00

Non Member Price: $20.00

Price: $20.00

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Cathodic Protection by galvanic anodes installed at construction stage on an offshore jacket structure or a complex of several jackets needs to be upgraded when lifetime extension is required. Marine operations and underwater works being very expensive, the choice of the rehabilitation method is often driven by the associated costs for such revamping works. This document presents the overall approach undertaken on an offshore field in the Gulf of Guinea to carry out the revamping of the cathodic protection of several jackets and the technical choice of the impressed current when compared to galvanic anodes, considering technical and economic aspects, and pointing out the various advantages and drawbacks.