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51318-11218-A Case Study of Soil-Side Corrosion of Aboveground Storage Tanks in the Middle East

Picture for 51318-11218-A Case Study of Soil-Side Corrosion of Aboveground Storage Tanks in the Middle East
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Soil-side corrosion of the bottom plates of aboveground storage tanks is the main cause of tank failure. A case study is discussed in this paper, in which failures of three storage tanks were investigated. Soil analysis revealed high salt content and low resistivity.

Product Number: 51318-11218-SG
Author: Hanan Farhat
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
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Soil-side corrosion of the bottom plates of aboveground storage tanks is the main cause of tank failure in 90% of the storage tanks in the Middle East. Chemical and topographical analysis of the soil revealed high salt content and sinkholes that lead to porous soil structure that is not stable. A case study is discussed in this paper, in which failures of three storage tanks were investigated. In the three cases, the soil analysis revealed high salt content and low resistivity. The soil was ranked in the extremely corrosive region. Impressed Current Cathodic Protection (ICCP) doesn’t provide the necessary protection for these tanks. Analysis of the corrosion scale on the tank bottoms were conducted using X-Ray Diffraction Spectroscopy (XRD), X-Ray Fluorescence Spectroscopy (XRF), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). It is believed that the corrosion scale on the bottom of the tanks, as well as the presence of voids in the soil prevented the ICCP from providing the necessary protection to the tank bottoms.

Key words: soil-side corrosion, aboveground storage tanks, impressed current cathodic protection, ICCP.

Soil-side corrosion of the bottom plates of aboveground storage tanks is the main cause of tank failure in 90% of the storage tanks in the Middle East. Chemical and topographical analysis of the soil revealed high salt content and sinkholes that lead to porous soil structure that is not stable. A case study is discussed in this paper, in which failures of three storage tanks were investigated. In the three cases, the soil analysis revealed high salt content and low resistivity. The soil was ranked in the extremely corrosive region. Impressed Current Cathodic Protection (ICCP) doesn’t provide the necessary protection for these tanks. Analysis of the corrosion scale on the tank bottoms were conducted using X-Ray Diffraction Spectroscopy (XRD), X-Ray Fluorescence Spectroscopy (XRF), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). It is believed that the corrosion scale on the bottom of the tanks, as well as the presence of voids in the soil prevented the ICCP from providing the necessary protection to the tank bottoms.

Key words: soil-side corrosion, aboveground storage tanks, impressed current cathodic protection, ICCP.

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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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