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Deepwater Oil & Gas developments consist of many more components designed to extract, transport and store the oil when compared with developments in shallower waters. Designing the cathodic protection [CP] systems to protect the individual components is problematic without an appreciation as to how CP systems fitted to the various components will interact with one another once the entire asset is commissioned.

For a recent deep-water project, a computer modeling study was commissioned to provide information on the performance of the CP systems protecting each of the subsea structures and in particular the interaction currents flowing between them. The principal aim was to ensure that the impressed current CP (ICCP) system on the hull of the FPSO would be operated in such a manner as to reduce interaction with the sub sea sacrificial anode CP systems to the minimum possible throughout the operating life of the field and to develop an understanding of the probable behavior of CP systems on the key components (FPSO, Oil offloading lines & Buoy, Riser Structures, etc.) particularly in respect of sacrificial anode lives.

In addition, a further aim was to provide a working tool for Operations that could be used to aid ICCP control beyond the design and construct phases, and to provide input to Risk Based Inspection and maintenance planning.

Keywords: Cathodic Protection, Boundary Element Modeling, Modeling, ICCP

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