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

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
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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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