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Picture for Coating Anomaly Detection with Integrated Indirect Inspection Tools
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Coating Anomaly Detection with Integrated Indirect Inspection Tools

Product Number: 51319-12810-SG
Author: Chukwuma Onuoha
Publication Date: 2019
$20.00
Picture for Corrosion Risk Assessment and Corrosion Mitigation of Bottom Plates on Above ground Tanks
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Corrosion Risk Assessment and Corrosion Mitigation of Bottom Plates on Above ground Tanks

Product Number: 51319-12826-SG
Author: Mehrooz Zamanzadeh
Publication Date: 2019
$20.00

This paper describes the corrosion risk assessment and corrosion mitigation of bottom plates on aboveground tanks used for the storage. The standard method of determining the corrosiveness or the effectiveness of cathodic protection on a tank bottom is the tank-to-soil potential measurement. One of the problems associated with monitoring cathodic protection systems on tank bottoms is the inability to assess empty space under the tank or to place a reference electrode in close proximity to the underside of the tank resulting in measurements that may not represent the tank-to-soil potential at specific areas or at the center of the tank bottom. When utilizing earthen foundations soil analysis is useful to help determine whether the potential corrosion activity will be high enough to make cathodic protection necessary and whether cathodic protection will be a practical application to prevent corrosion. The advantages and disadvantages of each will be discussed. Determination of aggressive ions such as chlorides and sulfates along with measurement of moisture pH and resistivity at shallow and deep burial are helpful for further corrosion analysis. Predictive modeling based on soil corrosivity data will provide life expectancy or remaining life with moderate to high confidence levels. Corrosion mitigation techniques such as cathodic protection concrete foundations and VCI will be discussed briefly.In this paper case histories of corrosion perforation will be provided. On-site visual inspection magnetic flux leakage (MFL) inspection ultrasonic testing (UT) and evaluation of the external cathodic protection (CP) system will be considered in the failure analysis. The corrosion products were analyzed using energy-dispersive X-ray analysis (EDAX) to determine the possible corrosion mechanisms.

Picture for General Corrosion versus Temperature Trends for Austenitic Stainless Steels with Various Surface Finishes
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General Corrosion versus Temperature Trends for Austenitic Stainless Steels with Various Surface Finishes

Product Number: 51319-12914-SG
Author: Michael LeClair
Publication Date: 2019
$20.00