Numerical 3D BEM Simulation Of A
CP System For A Buried Tank Influenced By
A Steel Reinforced Concrete Foundation
Author(s)
M. Purcar, J. Deconinck1, B. Van den Bossche, L. Bortels
& P. J. Stehouwer
Abstract
An advanced three-dimensional Boundary Element Method (BEM) approach is
used to quantify the influence and mitigation of a steel reinforced concrete
foundation on the cathodic protection (CP) level of a neighbouring buried tank.
Due to the fact that the reinforced concrete is connected to the CP system, this
concrete structure attracts a substantial fraction of the current that is injected by
far field anodes. As a consequence, the tank wall that is facing the foundation, is
under protected (tank/soil potential -600 to –700 mV vs. Cu/CuSO4), while the
opposite tank wall (facing the far field) is well protected (-1200 mV vs.
Cu/CuSO4). These simulations are in agreement with the measurements. Rather
than remediate this situation by an expensive trial and error approach, Gasunie
preferred to cooperate with ElSyCa and to simulate first the effects of various
possible solutions they had in mind. These simulations predict a significant
improvement of the tank wall protection level by about 200 mV at the foundation
side when insulating screens are placed between the tank and the foundation
(depending on size and position of the screens) while the far field side is hardly
influenced. As the solver is fully integrated in the SolidWorks CAD
environment, any modification of the dimensions of the entire configuration (e.g.
the screens), the surface mesh characteristics (determining the computational
accuracy), and the physico-chemical input parameters (polarisation
characteristics, soil conductivity, etc.) can be established in a fast and easy
manner.
Keywords: cathodic protection systems, advanced software packages, advanced
BEM.
Keywords
cathodic protection systems, advanced software packages, advanced
BEM.
Related Book
Other papers in this volume
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