Understanding the interactions between cathodic protection systems is becoming more complex particularly in the marine and offshore industry. The search for oil and gas in deeper waters and remote environments has resulted in engineering designs with many components on the sea bed as well as at the sea surface. Traditional design methods are inadequate in these situations as interactions will occur between the Cathodic Protection (CP) systems of the components, and significant currents can develop in the connecting flow lines. In this paper recent developments made in the BEASY Corrosion Modelling software are presented which enable these systems to be simulated. Examples are presented showing how computer modelling can play a major role in predicting the level of interaction and providing the key data for the design of the system and its integrity management.

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