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03197 A POTENTIAL ATTENUATION EQUATION FOR DESIGN AND ANALYSIS OF PIPELINE CATHODIC PROTECTION SYSTEMS WITH DISPLACED ANODES

Potential attenuation equation for pipelines and risers with multiple, equally spaced, identical superimposed spherical (bracelet) galvanic anodes that incorporates all relevant resistance terms (anode, coating, polarization, and metallic return path) has been modified for situations where anodes are displaced.

Product Number: 51300-03197-SG
ISBN: 03197 2003 CP
Author: Diane K. Lysogorski, William H. Hartt
Publication Date: 2003
$20.00
$20.00
$20.00

A recently proposed, first-principles based potential attenuation equation, for pipelines and risers with multiple, equally spaced, identical superimposed spherical (bracelet) galvanic anodes that incorporates all relevant resistance terms (anode, coating, polarization, and metallic return path) has been modified for situations where anodes are displaced. The equation is solved numerically using the Coordinate Mapping Based Finite Difference Method, and potential versus distance plots are provided for several examples with accuracy being proven by independent calculations. The solutions are compared with those of the classical equation of Uhlig, and it is concluded that the latter is overly conservative in situations where the pipeline or a portion there of lies in the potential field of the anode. It is demonstrated further how the equation can be employed for pipelines polarized by impressed current anodes.

Key words: Cathodic protection, pipelines, inclusive equation, attenuation, offset anodes.

A recently proposed, first-principles based potential attenuation equation, for pipelines and risers with multiple, equally spaced, identical superimposed spherical (bracelet) galvanic anodes that incorporates all relevant resistance terms (anode, coating, polarization, and metallic return path) has been modified for situations where anodes are displaced. The equation is solved numerically using the Coordinate Mapping Based Finite Difference Method, and potential versus distance plots are provided for several examples with accuracy being proven by independent calculations. The solutions are compared with those of the classical equation of Uhlig, and it is concluded that the latter is overly conservative in situations where the pipeline or a portion there of lies in the potential field of the anode. It is demonstrated further how the equation can be employed for pipelines polarized by impressed current anodes.

Key words: Cathodic protection, pipelines, inclusive equation, attenuation, offset anodes.

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