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Vapor corrosion inhibitor installation for cased crossing and aboveground storage tank bottoms at military facilities. Safety, testing, documentation and lessons learned. Also, NEC requirements where applicable.
What does it take to prepare a structure for vapor corrosion inhibitor (VCI) installation? What tasks are required to ensure that an effective amount of inhibitor is being maintained? What are some of the methods utilized to prolong the effective life of VCI’s?
With new pipelines/aboveground storage tanks being built and existing pipelines/aboveground storage tanks aging, cased crossings and tank bottoms are ideal applications for VCI’s. Military facilities are beginning to utilize these products. Safety, coordination, troubleshooting, various testing methods and construction practices are some of major parts associated with proper VCI installation. As corrosion engineers we must work in all of these areas to ensure that VCI’s can be utilized to their full capacity.
This paper discusses the many concerns related to VCI installation for cased crossing and aboveground storage tank bottoms at military facilities. Including safety, testing, documentation and lessons learned. Also addressed are NEC requirements where applicable. The topics discussed are practical and the lessons learned are first-hand accounts. The purpose of this paper is to share what has been learned and some of the company policies that have been taken from many years of pipeline and tank farm operation at military facilities.
Key words: vapor corrosion inhibitor, VCI, cased crossing, aboveground storage tank bottom
Compatibility between vapor corrosion inhibitors (VCI) and cathodic protection (CP) for the tank bottom application. Guidelines presented for selecting an effective corrosion mitigation strategy for combined VCI and CP systems.
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Conclusions: (1) vapor corrosion inhibitors (VCIs) can control corrosion on steel materials in contact with AST tank bottom backfill. (2) Efficiency of VCIs is affected by salt contamination or impurities in the backfill. (3) Corrosion of small areas of steel are not indicative of corrosion AST tank bottoms. (4) A path forward.
Corrosion control systems for the underside steel plates of above-ground storage tanks (ASTs) may not provide adequate protection. Volatile Corrosion Inhibitors (VCIs) reduce corrosion in this area and their effectiveness is presented in this paper.