Predicting The Performance Of Cathodic
Protection Systems With Large Scale Interference
Author(s)
R. Adey, J. M. W. Baynham & T. Curtin
Abstract
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.
1 Introduction
Boundary Element Methods (BEM) have been used to simulate the behaviour of
cathodic protection systems since the late 1970s [1]. As the name implies, the
method requires creation of elements, but only on the boundary (i.e. surfaces) of
the problem geometry. The BEM is used to mathematically model the potential
drop in the electrolyte represented by the Laplace equation. In many applications
it is sufficient to couple these equations with the equations representing the
electrochemical electrode kinetics on the metallic surfaces to form a system of
equations capable of simulating the potential fields and current flowing in the
electrolyte.
Keywords
Related Book
Other papers in this volume
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