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NEW! The first edition of Potential Theory Applied to Cathodic Protection Design showcases the mathematical development of analytical equations for the design of cathodic protection (CP) systems for underground structures with anode groundbeds having various configurations. Equations include calculations for the resistance and voltage (potential) to assist the CP design engineer.
This second edition has several important changes including updates on integral and analytic solutions for horizontal anodes in the same trench, an approach that was insufficiently developed in the first edition.
Also new for the second edition is an index for enhanced reader experience.
Other updates include:
Mixed metal oxide (MMO) is widely used as anode material for the cathodic protection of storage tank bottoms due to its advantages such as low consumption rate long service life and ideal current distribution. However with the elapse of service time the MMO CP systems have been found with such issues as low polarization level and uneven potential distribution threatening the operation safety of storage tanks. In this study numerical modeling and subscale experiment were chosen to clarify the main factors responsible for the aforementioned issues. The results indicated that the inadequacy of polarization and the lack of uniform potential distribution were related to a combination of multiple factors including the anode-to-tank bottom distance the impressed current level and the number of drain points. On the basis of these systematic analyses this paper conclusively proposes certain design principles and maintenance suggestions for the cathodic protection system of tank bottoms.
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A case study where MIC was recognized as primary cause of failure for an encased ductile iron water pipeline. The cathodically protected pipe was located within the proximity a creek crossing and had suffered from multiple failures.
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