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Partnering with the US Navy: Water Storage Tank Maintenance on a Global Scale

Fourteen countries, 20 states, and 76 bases…that sounds like quite a deployment! But what if, instead, you are charged with the evaluation and maintenance of over 500 water-storage tanks and related structures on those bases. Who would you turn to for professional guidance? How would you keep all of the details of the structures’ conditions and recommendations for maintenance organized in a manner that would allow you to rate and prioritize tank maintenance requirements?

Product Number: 51219-219-SG
Author: Gregory Chip Stein
Publication Date: 2019
Industries: Military , Coatings
$0.00
$20.00
$20.00

Fourteen countries, 20 states, and 76 bases…that sounds like quite a deployment! But what if, instead, you are charged with the evaluation and maintenance of over 500 water-storage tanks and related structures on those bases. Who would you turn to for professional guidance? How would you keep all of the details of the structures’ conditions and recommendations for maintenance organized in a manner that would allow you to rate and prioritize tank maintenance requirements?

Fourteen countries, 20 states, and 76 bases…that sounds like quite a deployment! But what if, instead, you are charged with the evaluation and maintenance of over 500 water-storage tanks and related structures on those bases. Who would you turn to for professional guidance? How would you keep all of the details of the structures’ conditions and recommendations for maintenance organized in a manner that would allow you to rate and prioritize tank maintenance requirements?

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Aboveground storage tanks (AST) soil-side corrosion protection is commonly implemented using cathodic protection (CP) technology. U.S. Department of Transportation mandate use of CP system for the tanks falling under federal regulations purview. In case of a double bottom tank i.e. a tank where original (old) bottom has been rendered useless and a second (new) bottom has been installed couple of inches above the original bottom the anodes are laid in the sand bed just above the old bottom. An impressed current cathodic protection (ICCP) system with an MMO anode is a preferred for this application however there are instances where a galvanic anode (GCP) system is also used for tank bottom protection. For effective operation of the CP system the current generated by the anode is a determining factor which mainly depends on the interface resistance between the anode and sand bed. In an ICCP system the current output can be driven to counter the circuit resistance of CP system whereas for a GCP system the potential difference between the anode and cathodeis the key driving factor. In other words the GCP system cannot function in a high resistivity sand bed system. Vapor Corrosion Inhibitors (VCI) are being used in combination with CP systems for the tank bottom soil side applications. VCIs tend to change the interface resistance by contact with the metal (anode and cathode) surfaces.In this paper investigations are carried out to understand the effect of VCIs on impressed current (MMO) and galvanic anodes and their ability to function in a VCI saturated electrolyte system. The passivation behavior of the anode is analyzed using electrochemical tests and the performance is evaluated. The paper also reports the simulated long-term performance of the ICCP and GCP system in the presence of VCIs.