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Challenges in Providing Effective Internal Corrosion Protection for Aboveground Storage Tanks

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Internal corrosion is an important consideration for metallic structures that contain or may contain conductive electrolytes. As internal corrosion can affect a variety of structure types it is influenced by a myriad of factors including but not limited to types of materials present electrolyte chemistry temperature presence of coatings and process flow characteristics. More specifically past and recent experience has shown that materials selection in many storage/process tanks has caused internal corrosion issues or negatively impacted the effectiveness of the designed cathodic protection system. These issues have reduced the effectiveness of post construction corrosion mitigation options. Specific examples from the waste water treatment and oil and gas industries will be discussed and suggestions made for materials selection improvements to aid in internal corrosion prevention. It is imperative that the tank designer and corrosion professional work together to mitigate possible corrosion issues during the design stage.

Product Number: 51319-13194-SG
Author: Natanael Melendez
Publication Date: 2019
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$20.00
$20.00
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Product Number: MPWT19-14297
Author: Mohammed Alotaibi
Publication Date: 2019
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Storage tanks are the primary means for storing large volumes of liquids and gaseous products. Metal
loss from internal and external corrosion can reduce the service life of a tank. It is important to maintain
the integrity of steel storage tanks for safety, economic, and environmental reasons.
Saudi Aramco implemented three different scenarios of cathodic protection (CP) during bottom plate
replacement for three typical tanks. The tanks’ bottom plates were replaced based on thickness
measurements and visual inspection that revealed severe corrosion from soil. The main reason for
such corrosion was due to the asphalt layer underneath the tank. It was considered during the
replacement of the bottom plate to provide a reliable external (CP) and leak detection system. The
purpose of this paper is to demonstrate the experience gained from executing CP upgrades, and to
provide the best option to ensure integrity, cost saving and fewer shutdown periods.
Picture for 02321 CORROSION PROTECTION OF STORAGE TANKS
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02321 CORROSION PROTECTION OF STORAGE TANKS

Product Number: 51300-02321-SG
ISBN: 02321 2002 CP
Author: Dr. Donald A. Kubik and Prof. Efim Ya. Lyublinski
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Picture for Corrosion Monitoring of Oil Storage Tanks
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Corrosion Monitoring of Oil Storage Tanks

Product Number: 51319-12822-SG
Author: C Brossia
Publication Date: 2019
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Corrosion of oil storage tanks used to store crude oil and produced water in an operating oil field were identified as a potential safety issue when inspection results indicated significant wall loss due to internal corrosion. Corrosion was noted to be particularly severe in the lower sections of some tanks where sludge layers were believed to have formed. Previous attempts to monitor for corrosion using mass loss coupons and acoustic emission were found to provide less than adequate information regarding corrosion risk. Corrosion monitoring using alternate approaches utilized to provide additional information regarding possible corrosion of the tank at different locations within the tanks.
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