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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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$20.00

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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51316-7019-Cathodic Protection System for Hot Sulphur Tank Bottom

Product Number: 51316-7019-SG
ISBN: 7019 2016 CP
Author: Salim Debbache
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Cathodic protection of hot tank bottom tanks requires specific design parameters. This paper presents the design, installation details and commissioning results for two hot sulphur tank cathodic protection using impressed current titanium / Mixed Metal Oxide ribbon anode grid system.

 
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10025 Remoteness of Impressed Current Anode Ground Beds

Product Number: 51300-10025-SG
ISBN: 10025 2010 CP
Author: R P Nagar
Publication Date: 2010
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This paper contains a review of commonly used practices and presents a generalized technique for the calculation of earth potentials for the determination of remoteness of impressed current anode ground beds. The intent is to facilitate proper design and evaluation of anode ground beds of impressed current cathodic protection system for cross-country pipelines.
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51316-7186-Corrosion Control Of On-Grade Petroleum Products Storage Tank Bottoms Using Impressed Current Cathodic Protection System with Continuous Anode Bed

Product Number: 51316-7186-SG
ISBN: 7186 2016 CP
Author: Dare Aloko
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 An effective and efficient impressed cathodic protection system by laying a continuous shallow anodes bed in close proximity to the tank foundation. Some of the merits of this installation include elimination of shielding effects or interference from other structures and uniform protection of the entire tank bottom.
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