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External corrosion of tank bottoms is a significant problem for tank owners for both economic and environmental reasons. Corrosion Protection of Above Ground Storage Tanks is typically provided by a impressed current cathodic protection (CP) with or without coatings. Two primary Impressed current CP configurations are used worldwide in tanks. The field-erected mixed metal oxide (MMO) anode grid configuration was an early application of MMO anodes for tank bottoms and has a large global installed base. A newer design to protect tank bottoms is a system of parallel or concentric ring MMO linear anodes with factory connected tail cables.This paper will review the design of “grid” type and “parallel/concentric” linear anode type tank CP designs provide an economic assessment assign a qualitative risk assessment matrix and discuss the implementation impact based on a large grass root tank farm project in Africa. Where the owner/engineers elected to use linear anodes.
Case study for anode grid systems. used for Cathodic Protection of above ground storage tank bottom plates. Technical solutions for arranging the anode grid on large (90 m diameter) tanks are studied and compared in respect to the CP major objective.
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Soil-side corrosion of the bottom plates of aboveground storage tanks is the main cause of tank failure. A case study is discussed in this paper, in which failures of three storage tanks were investigated. Soil analysis revealed high salt content and low resistivity.