Optimum Design Of Cathodic Protection Using
The Boundary Element Method
Author(s)
K. Amaya1 & S. Aoki2
Abstract
Optimization of cathodic protection systems for a pipeline and a ship was performed
by using the boundary element method (BEM). For a pipeline, the location
and impressed current of electrodes in a cathodic protection system were optimized
by minimizing the electric power necessary to keep the potential on the
metal surface below a critical value. The non-uniformity of soil conductivity and
the resistance of a long pipeline were taken into account. For a ship, an inverse
problem to estimate the potential distribution on the whole surface of the hull from
the electric potential data measured with several sensors was solved at first. Then,
the optimum current to be impressed to each electrode located on the hull was
determined by using the results of the inverse analysis.
1 Introduction
Protecting structures, such as a pipeline and a ship, from corrosion is one of the
most important problems in engineering [1]. To prevent corrosion of a pipeline, its
outer surface is painted and also cathodic protection is performed by impressing
current into surrounding soil from a finite number of electrodes. It is necessary to
optimize the location and current to be impressed to each electrode.
Application of the boundary element method to the optimization has been studied
intensively [2]-[6]. Special consideration is necessary for a pipeline. because
it is so long that the non-uniformity of the electric conductivity of soil must be
taken into account, and also the electric resistance of the pipeline can not be
neglected [7, 8].
The cathodic protection is performed also for a ship by impressing current into
surrounding sea from several electrodes on its hull. Some sensors for monitoring
Keywords
Related Book
Other papers in this volume
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