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10027 Impressed Current Cathodic Protection for External Bottom Plates of Large AST - Design Versus Factual Model

Picture for 10027 Impressed Current Cathodic Protection for External Bottom Plates of Large AST
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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.

Product Number: 51300-10027-SG
ISBN: 10027 2010 CP
Author: Abdul Wahab Al-Mithin, Saleh Al-Suliman, Hasan Sabri, Amer Jaragh and Renish Rahim
Publication Date: 2010
Industries: Cathodic Protection , Pipelines, Tanks, and Underground Systems
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Maintaining a successfully operating Cathodic Protection to the entire surface of the tank bottom plate is a challenge to the practicing CP professionals. Proper and even distribution of the CP current is one of greatest importance. Defining an adequate criteria for effective protection of such a system is a challenge, considering: high resistivity electrolyte (washed sand), limiting current density at anode surface to reduce depolarizing effects due to oxygen evolution by anodic reactions, tank surface temperature, etc. This case study is carried out for anode grid systems, which are commonly utilized for Cathodic Protection of AST bottom plates in the Middle East. Different technical solutions for arranging the anode grid on large diameter (90 m diameter) tanks are studied and compared in respect to the CP major objective. Attenuation of CP current in the anode appears to be one of the main factors for consideration at the CP design and understanding of the real structure model behavior is the one to be considered at the time of CP system operation and maintenance.

Keywords: Cathodic protection, AST, tank external bottom plates, soil resistivity, grid anodes, MMO ribbon anode, criteria, current distribution, large diameter tanks, containment liner

Maintaining a successfully operating Cathodic Protection to the entire surface of the tank bottom plate is a challenge to the practicing CP professionals. Proper and even distribution of the CP current is one of greatest importance. Defining an adequate criteria for effective protection of such a system is a challenge, considering: high resistivity electrolyte (washed sand), limiting current density at anode surface to reduce depolarizing effects due to oxygen evolution by anodic reactions, tank surface temperature, etc. This case study is carried out for anode grid systems, which are commonly utilized for Cathodic Protection of AST bottom plates in the Middle East. Different technical solutions for arranging the anode grid on large diameter (90 m diameter) tanks are studied and compared in respect to the CP major objective. Attenuation of CP current in the anode appears to be one of the main factors for consideration at the CP design and understanding of the real structure model behavior is the one to be considered at the time of CP system operation and maintenance.

Keywords: Cathodic protection, AST, tank external bottom plates, soil resistivity, grid anodes, MMO ribbon anode, criteria, current distribution, large diameter tanks, containment liner

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