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Chloride induced corrosion is recognized as a significant disease in the nation's concrete infrastructure. This paper will provide an overview of the various corrosion mitigation techniques available and then focus on two innovative methods of using discrete anodes embedded within the concrete to provide corrosion protection to existing structures.
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Interference Testing is a task learned through education and experience and is one of the basic skills of Cathodic Protection Personnel. This paper will discuss interference testing and present some case histories, of basic static interference situations and the mitigation methods used.
In this paper, a simulation software suite will be presented that is able to model both resistive (“close field”) as inductive (“far field”) interference in right of way’s (ROW’s) with pipeline and power transmission networks of any complexity.
The monitoring program used in the Danish Sector of the North Sea to manage microbiologically influenced corrosion (MIC) risk assessment for seven pipelines. Quantitative data on microbial activity was obtained from pigging debris using real-time polymerase chain reaction of MIC-causing microorganisms.
Corrosive biofilm formation on metal surfaces can have serious impacts. Through this proof of concept research project we established and maintained MIC biofilms for testing with various enzyme preparations. After two months of incubation in a bioreactor inoculated with a consortium of MIC microorganisms, the presence of corrosive MIC biofilms were confirmed on steel coupons.
This paper details a comprehensive AC interference analysis and implementation of an extensive AC corrosion mitigation and monitoring system for a 100-mile (328 kilometer) portion of a regulated pipeline.
A 22-year-old liquid line experienced an unexpected failure due to internal corrosion after adding the production from one well. Investigation included ILI records, operating pressures and temperatures, oil pressure / volume / temperature (PVT) data, possible flow regimes, failure analysis reports, and mitigation practices.
The goal of The Nuclear Energy Agency (NEA) is to assist its member countries in ensuring safety, through regulation and oversight of nuclear installations, and to preserve the scientific and technological knowledge base.
A case history of a large diameter pipeline with fusion bonded epoxy coating that experienced AC corrosion within six (6) years while a similar 67-year-old pipeline with coal tar enamel coating experienced none.
Concerns related to stray DC interference. Including safety, testing, documentation and lessons learned. Also addressed are DC powered transit systems and other unordinary sources of DC interference.
Sampling of pigging debris was performed from three multiphase pipelines that previously were exposed to microbiologically influenced corrosion (MIC) due to high abundances of sulfate reducing prokaryotes (SRP) and methanogens.
Experimentation was performed to determine if there might be a way to further reduce the AC voltages on pipelines better than the existing system of just using parallel ground paths as a mitigation technique.