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Improved Cathodic Protection Current Distribution for Above Ground Storage Tank Bottoms Due to Low Resistivity Vapor Corrosion Inhibitor Use

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In this paper, the CP current distribution with changing resistivities and the area of influence required to meet effective CP criteria, is studied. The results indicate that the tank pad electrolyte resistivity plays a significant role in achieving uniform CP current distribution. The paper also explores the use of Vapor Corrosion Inhibitor (VCI) and its effect on electrolyte resistivity and the resulting CP current distribution.

Product Number: 51322-17666-SG
Author: Sujay Math
Publication Date: 2022
Industries: Cathodic Protection , Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00
$20.00

The close anode ground bed cathodic protection (CP) system design for the Aboveground Storage Tank (AST) bottoms uses the area of influence surrounding each anode ground bed, in contributory area design, to provide adequate CP. The area of influence surrounding each anode ground bed, mainly depends on the adopted CP criteria, and is greatly affected by the changing electrolyte resistivities of the AST tank pads and the distance between the anode and the structure. Accommodating for changing electrical properties is a standard requirement for CP designs and the spacing of anodes is adjusted to get proper current distribution coverage. In case of a deficient CP design, where the design parameters
are not cautiously considered or when the field parameters change considerably from the design assumptions, CP will be inadequate.

The close anode ground bed cathodic protection (CP) system design for the Aboveground Storage Tank (AST) bottoms uses the area of influence surrounding each anode ground bed, in contributory area design, to provide adequate CP. The area of influence surrounding each anode ground bed, mainly depends on the adopted CP criteria, and is greatly affected by the changing electrolyte resistivities of the AST tank pads and the distance between the anode and the structure. Accommodating for changing electrical properties is a standard requirement for CP designs and the spacing of anodes is adjusted to get proper current distribution coverage. In case of a deficient CP design, where the design parameters
are not cautiously considered or when the field parameters change considerably from the design assumptions, CP will be inadequate.

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Case Study: HDD CP Retrofit For Existing Critical Service Ethylene Above Ground Storage Tank.

Product Number: 51322-18035-SG
Author: Shailesh Javia, Venkat Sreenivas
Publication Date: 2022
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Corrosion has long been recognized as an extremely costly naturally occurring phenomenon that can be controlled through the proper application of corrosion prevention and control methods protecting public safety, extending the service life of assets and preventing damage to property and the environment.  The landmark Cost of Corrosion Study published by the U.S. Federal Highway Administration estimated that corrosion costs were approximately 3.1% of the nation’s GDP.  Within the study, several key sectors of the US economy were studied.  This paper is focused on one of those areas – the corrosion risks associated with storage tanks that contain hazardous materials.  The study determined that the annual direct cost of corrosion for above ground hazardous material storage tanks (ASTs) in the US was ~$4.5 billion. 
Picture for Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion
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Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion

Product Number: 51317--9025-SG
ISBN: 9025 2017 CP
Author: Naif Abri
Publication Date: 2017
$20.00

The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.

 
Picture for 51318-11218-A Case Study of Soil-Side Corrosion of Aboveground Storage Tanks in the Middle East
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51318-11218-A Case Study of Soil-Side Corrosion of Aboveground Storage Tanks in the Middle East

Product Number: 51318-11218-SG
Author: Hanan Farhat
Publication Date: 2018
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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.
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