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Potential Distribution and Polarization Effect of Storage Tank Bottoms With Cathodic Protection Applied by MMO-Coated Titanium Anode Grids

Picture for Potential Distribution and Polarization Effect of Storage Tank Bottoms With Cathodic Protection Applied by MMO-Coated Titanium Anode Grids
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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.  

Product Number: 51319-13315-SG
Author: Wei Cui
Publication Date: 2019
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$20.00
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