Simplified Calculations of Impressed Current Anode Bed Resistance Underneath Tank Bottoms

Impressed current cathodic protection using uniformly distributed ribbon anodes has proven to be effective in controlling the corrosion of soil-side aboveground storage tank bottoms. Parallel and concentric ribbon anodes are two of the most common patterns of laying anode beds some distance undernea...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2008-02, Vol.64 (2), p.138-142
Main Authors: DEMOZ, A, FRIESEN, W. I
Format: Article
Language:English
Subjects:
Above ground tanks
Anode effect
Anodes
Anodic protection
Applied sciences
Calculators
Cathodic protection
Corrosion
Corrosion environments
Corrosion prevention
Exact sciences and technology
Finite element method
Historical account
History
Mathematical analysis
Metals. Metallurgy
Protection
Soil
Storage tanks
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Summary:Impressed current cathodic protection using uniformly distributed ribbon anodes has proven to be effective in controlling the corrosion of soil-side aboveground storage tank bottoms. Parallel and concentric ribbon anodes are two of the most common patterns of laying anode beds some distance underneath tank bottoms. At the design stage, the rule-of-thumb approach and historical data are used to determine the spacing between ribbon nodes. Computer-aided finite element analysis is potentially also available to assist in determining anode distributions. However, because of its complexity, this approach is not used frequently in practice. In this work, we address the design issue by taking a simplified approach based only on the geometries and the cathodic protection current requirement. The equations derived enable the determination (using a pocket calculator) of the number of concentric or parallel anodes, the spacing between them, and the anode bed resistances. Support of the derived resistance equations is established by comparing them with the well-known expressions for symmetrical geometries.
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3280682