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

Picture for External Corrosion Protection of Aboveground Storage Tanks Using Vaporized Corrosion Inhibitors
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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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Product Number: 51317--9544-SG
ISBN: 9544 2017 CP
Author: Tunde Kingsley Adelakin
Publication Date: 2017
Industry: Chemical Inhibitors
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External soil side corrosion protection of aboveground storage tank bottom is most commonly achieved through the application of cathodic protection (CP) current. However in certain cases using CP may not be possible particularly if the tank has a liner. In such cases Vapor Corrosion Inhibitor (VCI) is being used as an alternative solution to protect existing tank bottoms.In this study application of VCI as an alternative for corrosion control of underside tank bottoms with liners has been investigated. Ten electric resistance (ER) probes were installed in-between the underside of tank bottom and the liner. These probes were grouped into 3 groups; probes in group 3 were placed 5 feet away from the edge of the tank group 2 probes were placed 15 feet away from the edge of the tank and group 1 probes were placed at 5 feet 15 feet and 35 feet away from the edge of the tank bottom towards the center. Specified volume of VCI was injected through a leak detection port from the edge of the tank bottom towards the center. The initial corrosion rates occurring at the different locations were high and tend to decrease with time. The ER probes used to monitor the rate of corrosion showed a pattern liken to a tank under cathodic protection. Finally the results of the investigation will be discussed further based on operating parameters of the tank. The data collected is used to predict the effectiveness of VCI in controlling corrosion at the underside steel tank bottoms.

Key words: Vapor corrosion inhibitor, electrical resistance probes (ER), above ground storage tanks (AST), HDPE Liner

External soil side corrosion protection of aboveground storage tank bottom is most commonly achieved through the application of cathodic protection (CP) current. However in certain cases using CP may not be possible particularly if the tank has a liner. In such cases Vapor Corrosion Inhibitor (VCI) is being used as an alternative solution to protect existing tank bottoms.In this study application of VCI as an alternative for corrosion control of underside tank bottoms with liners has been investigated. Ten electric resistance (ER) probes were installed in-between the underside of tank bottom and the liner. These probes were grouped into 3 groups; probes in group 3 were placed 5 feet away from the edge of the tank group 2 probes were placed 15 feet away from the edge of the tank and group 1 probes were placed at 5 feet 15 feet and 35 feet away from the edge of the tank bottom towards the center. Specified volume of VCI was injected through a leak detection port from the edge of the tank bottom towards the center. The initial corrosion rates occurring at the different locations were high and tend to decrease with time. The ER probes used to monitor the rate of corrosion showed a pattern liken to a tank under cathodic protection. Finally the results of the investigation will be discussed further based on operating parameters of the tank. The data collected is used to predict the effectiveness of VCI in controlling corrosion at the underside steel tank bottoms.

Key words: Vapor corrosion inhibitor, electrical resistance probes (ER), above ground storage tanks (AST), HDPE Liner

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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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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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Mitigation of Soil-Side Bottom Corrosion of Aboveground Storage Tanks Utilizing Volatile Corrosion

Product Number: 51317--9462-SG
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Author: Kelly Baker
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Electrical resistance probes monitor mitigation of corrosion. Data will be presented from multiple installations demonstrating the ability of volatile corrosion inhibitors to mitigate corrosion for soil-side bottoms of aboveground storage tanks.
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