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Effectiveness of Vapor Corrosion Inhibitors for Corrosion Control of Tank Bottom Plate

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Soil-side corrosion of above ground storage tank bottoms is a major challenge for the midstream operators owning tanks farms. In North America most of the above ground storage tanks include active cathodic protection (CP) systems to protect soil-side of the tank bottoms from corrosion. However CP systems could fail leading to unprotected tank bottom and sometime extensive corrosion could occur even with an active CP system in place. In addition a tank without a CP system could experience elevated corrosion including pitting corrosion. Vapor corrosion inhibitors (VCIs) are being promoted as alternative corrosion control measures.A pipeline research council international (PRCI)-sponsored study was conducted to evaluate effectiveness of the VCIs in mitigating corrosion. The study was conducted to determine to determine whether the VCIs are effective in mitigating corrosion to a level comparable to a working CP system for tank bottoms. Extensive amount of laboratory scale testing was conducted and the experimental data were rigorously analyzed. It was found that the VCIs are effective in mitigating corrosion when vendor specific recommended dosages are used but the corrosion rates were not mitigated to the extent specified in NACE SP0193 and NACE SP0169 for demonstrating adequate cathodic protection.

Product Number: 51319-13098-SG
Author: Pavan Shukla
Publication Date: 2019
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$20.00
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The Next Generation of Double Bottom Tank Cathodic Protection

Product Number: 51319-12924-SG
Author: Lou Koszewski
Publication Date: 2019
$20.00

A new and innovative method has been developed to allow for cathodic protection of the upper / new tank bottom in a double bottom tank. When two steel tank bottoms are in electrical contact with each other the lower tank bottom acts as an electrical shield to cathodic protection (CP) current external from the tank. By electrically isolating the new / upper tank bottom from the old tank bottom and old dead shell CP current can then flow right through the old tank bottom to cathodically protect the upper / new tank bottom. The old tank bottom and dead shell become essentially transparent. Non-conductive type release prevention membranes were required to be used in the past between the old tank bottom and upper / new tank bottom to prevent the galvanic affects of new steel / old steel corrosion. A conductive type of release prevention barrier can now be utuilized to provide leak prevention without the concern of new steel /old steel galvanic corrosion occuring between the two tank bottoms. Significant advantages occur by electrically isolating the upper / new tank bottom away from the old tank bottom and dead shell of which the most significant is that CP current can always pass through the old tank bottom eliminating the problems and concerns of consumed CP systems between the tank bottoms. Cathodic Protection data from two tanks incorporating this new and innovative method will be discussed.
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51318-11567-Methodologies to Evaluate Compatibility between Cathodic Protection and Vapor Corrosion Inhibitors for Tank Bottom Applications

Product Number: 51318-11567-SG
Author: Sujay Math / Pavan K. Shukla
Publication Date: 2018
$20.00

Compatibility between vapor corrosion inhibitors (VCI) and cathodic protection (CP) for the tank bottom application. Guidelines presented for selecting an effective corrosion mitigation strategy for combined VCI and CP systems.
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.

 
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