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09543 New Earth Potential Equations and Applications

Picture for 09543 New Earth Potential Equations and Applications
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Product Number: 51300-09543-SG
ISBN: 09543 2009 CP
Author: Rogelio De las Casas
Publication Date: 2009
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The distance between the groundbed and protected structure should be considered during the design of an impressed current cathodic protection system. This distance is determined using the ratio between the potential change in the earth due to the groundbed (buried electrodes) and the groundbed potential to remote earth. Currently the equations used to calculate the potential change in the earth due to buried electrodes are for single vertical or horizontal electrodes only. This paper presents new equations for the determination of potential changes in the earth due to the groundbed. Unlike the currently used equations, the developed equations work for groundbeds with any number of anodes, either vertical or horizontal, and work for groundbeds with varied anode spacing. These equations provide a method to calculate the groundbed’s area of influence, aiding in the determination of optimum groundbed location. The equations also apply to any metallic structure in an electrolyte that can be affected by direct current flow.

Keywords: anodes to remote earth potentials, cathodic protection design, stray current, direct current interference, anodes area of influence
The distance between the groundbed and protected structure should be considered during the design of an impressed current cathodic protection system. This distance is determined using the ratio between the potential change in the earth due to the groundbed (buried electrodes) and the groundbed potential to remote earth. Currently the equations used to calculate the potential change in the earth due to buried electrodes are for single vertical or horizontal electrodes only. This paper presents new equations for the determination of potential changes in the earth due to the groundbed. Unlike the currently used equations, the developed equations work for groundbeds with any number of anodes, either vertical or horizontal, and work for groundbeds with varied anode spacing. These equations provide a method to calculate the groundbed’s area of influence, aiding in the determination of optimum groundbed location. The equations also apply to any metallic structure in an electrolyte that can be affected by direct current flow.

Keywords: anodes to remote earth potentials, cathodic protection design, stray current, direct current interference, anodes area of influence
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