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Analyses Methodologies For In-Situ Corrosion Monitoring Of Tank Bottom Plate Corrosion

Picture for Analyses Methodologies For In-Situ Corrosion Monitoring Of Tank Bottom Plate Corrosion
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Product Number: 51321-16896-SG
Author: Pavan K. Shukla; Roderick E. Fuentes; Bruce J. Wiersma; Crystal Girardot; Jason Page; Shawn T. Campbell
Publication Date: 2021
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$20.00
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Electrical Resistance (ER) probes are routinely used to monitor above ground storage tank bottom plate corrosion. However, surface and material conditions between the tank plate and ER probes can differ significantly. In addition, a tank plate may have undergone weathering in various conditions that may not be applicable for the ER probe elements. In such situations, ER probes' accumulative corrosion could be different compared to that of the tank bottom plate. The corrosion could further change when vapor corrosion inhibitor treatments are applied to the tank pad. Experiments were conducted using coupons and ER probes. Coupons were weathered by initially exposing them to the corrosive conditions, and then three different VCI treatments were applied. The ER probe data were continuously collected. The coupons' and ER-probe corrosion rates were compared before and after VCI treatments using a ratio method. This paper presents various comparison methodologies that can be used to bound the bottom plate corrosion conditions and corresponding corrosion rates. The paper also presents recommendations for using various element-type ER probes for the tank bottom plates' in-situ corrosion monitoring.

Electrical Resistance (ER) probes are routinely used to monitor above ground storage tank bottom plate corrosion. However, surface and material conditions between the tank plate and ER probes can differ significantly. In addition, a tank plate may have undergone weathering in various conditions that may not be applicable for the ER probe elements. In such situations, ER probes' accumulative corrosion could be different compared to that of the tank bottom plate. The corrosion could further change when vapor corrosion inhibitor treatments are applied to the tank pad. Experiments were conducted using coupons and ER probes. Coupons were weathered by initially exposing them to the corrosive conditions, and then three different VCI treatments were applied. The ER probe data were continuously collected. The coupons' and ER-probe corrosion rates were compared before and after VCI treatments using a ratio method. This paper presents various comparison methodologies that can be used to bound the bottom plate corrosion conditions and corresponding corrosion rates. The paper also presents recommendations for using various element-type ER probes for the tank bottom plates' in-situ corrosion monitoring.

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