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51318-10992-AST Corrosion Control and Monitoring with VCI Applications

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Conclusions: (1) vapor corrosion inhibitors (VCIs) can control corrosion on steel materials in contact with AST tank bottom backfill. (2) Efficiency of VCIs is affected by salt contamination or impurities in the backfill. (3) Corrosion of small areas of steel are not indicative of corrosion AST tank bottoms. (4) A path forward.

Product Number: 51318-10992-SG
Author: James A. Ellor P.E. / Elisabeth Kuespert
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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Corrosion control of above ground storage tank (AST) tank bottoms remains critical over the life of a tank. A primary form of corrosion control has been the application of cathodic protection (CP). Over time, these systems can fail or reach the end of their design lives. In recent years, vapor corrosion inhibitors (VCI) have been recommended to ensure continued protection of tank bottoms. VCIs have been added as an aqueous slurry mixture under tank bottoms as part of a retrofit of corrosion control systems.

Regulations require monitoring of the efficacy of the corrosion control method. For VCI applications under ASTs, the most common monitoring form has been the use of electrical resistance (ER) probes. ER probes indicate local corrosion action via self‐corrosion that decreases the cross‐sectional area of exposed metal. In AST applications, concerns have been raised as to the long‐term accuracy and relevance of ER probes. The present research indicates that VCIs can indeed control corrosion on steel materials in contact with AST tank bottom backfill materials; however, the efficiency of the VCIs is affected by the presence of salt contamination or impurities (e.g., clay) in the backfill. The research also showed that corrosion of small areas of steel, be it an ER probe or a steel coupon, buried in the sand backfill are not indicative of the range of corrosion that may occur on an AST tank bottom. The research suggests a path forward.

Corrosion control of above ground storage tank (AST) tank bottoms remains critical over the life of a tank. A primary form of corrosion control has been the application of cathodic protection (CP). Over time, these systems can fail or reach the end of their design lives. In recent years, vapor corrosion inhibitors (VCI) have been recommended to ensure continued protection of tank bottoms. VCIs have been added as an aqueous slurry mixture under tank bottoms as part of a retrofit of corrosion control systems.

Regulations require monitoring of the efficacy of the corrosion control method. For VCI applications under ASTs, the most common monitoring form has been the use of electrical resistance (ER) probes. ER probes indicate local corrosion action via self‐corrosion that decreases the cross‐sectional area of exposed metal. In AST applications, concerns have been raised as to the long‐term accuracy and relevance of ER probes. The present research indicates that VCIs can indeed control corrosion on steel materials in contact with AST tank bottom backfill materials; however, the efficiency of the VCIs is affected by the presence of salt contamination or impurities (e.g., clay) in the backfill. The research also showed that corrosion of small areas of steel, be it an ER probe or a steel coupon, buried in the sand backfill are not indicative of the range of corrosion that may occur on an AST tank bottom. The research suggests a path forward.

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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
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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.
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51318-11540-Experience from ER Probes and Coupons from Under Tank Applications of VCI

Product Number: 51318-11540-SG
Author: Conor Madden / Kelly Baker
Publication Date: 2018
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Corrosion control systems for the underside steel plates of above-ground storage tanks (ASTs) may not provide adequate protection. Volatile Corrosion Inhibitors (VCIs) reduce corrosion in this area and their effectiveness is presented in this paper.

 
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51317--9544-External Corrosion Protection of Aboveground Storage Tanks Using Vaporized Corrosion Inhibitors

Product Number: 51317--9544-SG
ISBN: 9544 2017 CP
Author: Tunde Kingsley Adelakin
Publication Date: 2017
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Vapor corrosion inhibitor (VCI) as an alternative for corrosion control of underside tank bottom. A specified volume of VCI was applied through a leak detector port 24-inch (60.96 cm) from the edge of the tank bottom plate, towards the center.  As expected, the initial corrosion rates at the different locations differ and tend to decrease with time.

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