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

Picture for Experience from ER Probes and Coupons from Under Tank Applications of VCI
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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.

 

Product Number: 51318-11540-SG
Author: Conor Madden / Kelly Baker
Publication Date: 2018
Industries: Chemical Inhibitors , Pipelines, Tanks, and Underground Systems
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$20.00
$20.00

Corrosion control systems used for the underside steel plates of above-ground storage tanks (ASTs) may not provide adequate protection in certain situations. Specifically, severe corrosion of the chime area may lead to unplanned outages and could impact the tank’s structural integrity near the critical weld between shell plates and chime plates. Volatile Corrosion Inhibitors (VCIs) have been implemented to reduce corrosion in this area and their effectiveness is presented in this paper. Direct Ultrasonic Thickness (UT) gauge inspection data and weight loss coupon data together validate the reduction in corrosion rates from the incorporation of VCIs. Additionally, this type of corrosion-control system has the potential to protect the entire underside floor plates when applied and monitored effectively. Electrical Resistance (ER) Probe data is presented to show how VCIs can be monitored to determine replenishment timelines. Field application data is presented to validate the use of VCIs in areas where current corrosion systems are lacking and to demonstrate how replenishment timelines can be established.

Keywords: Aboveground storage tanks, corrosion, Volatile Corrosion Inhibitors, VCI, Electrical Resistance Probe, ER probe, ultrasonic thickness, UT, tank chime

Corrosion control systems used for the underside steel plates of above-ground storage tanks (ASTs) may not provide adequate protection in certain situations. Specifically, severe corrosion of the chime area may lead to unplanned outages and could impact the tank’s structural integrity near the critical weld between shell plates and chime plates. Volatile Corrosion Inhibitors (VCIs) have been implemented to reduce corrosion in this area and their effectiveness is presented in this paper. Direct Ultrasonic Thickness (UT) gauge inspection data and weight loss coupon data together validate the reduction in corrosion rates from the incorporation of VCIs. Additionally, this type of corrosion-control system has the potential to protect the entire underside floor plates when applied and monitored effectively. Electrical Resistance (ER) Probe data is presented to show how VCIs can be monitored to determine replenishment timelines. Field application data is presented to validate the use of VCIs in areas where current corrosion systems are lacking and to demonstrate how replenishment timelines can be established.

Keywords: Aboveground storage tanks, corrosion, Volatile Corrosion Inhibitors, VCI, Electrical Resistance Probe, ER probe, ultrasonic thickness, UT, tank chime

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51318-11567-Methodologies to Evaluate Compatibility between Cathodic Protection and Vapor Corrosion Inhibitors for Tank Bottom Applications

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Author: Sujay Math / Pavan K. Shukla
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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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51318-11428-Successful Implementation of a Corrosion Management Strategy by Online Injection of Vapor Phase Corrosion Inhibitors to Extend Storage Tank Floor Life

Product Number: 51318-11428-SG
Author: Asad Al Ghafri / Jayant R Nair / Naif Al Abri / Latifa Al Shibli
Publication Date: 2018
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Oil storage tanks experienced accelerated corrosion from the soil side. The short term strategy adopted was to drill under the tanks and inject vapor phase corrosion inhibitors to extend the tank floor life in a risk-rated phased effort for the 48 tanks.
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51318-10992-AST Corrosion Control and Monitoring with VCI Applications

Product Number: 51318-10992-SG
Author: James A. Ellor P.E. / Elisabeth Kuespert
Publication Date: 2018
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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.
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