Microbially-influenced corrosion, victaulic couplings, water treatment, and DNA studies
The utilities at a major government office facility include both condenser and chilled water systems. Though they are similar, the water in the condenser system is regularly aerated, while the chilled water is a closed system. Piping in both is largely carbon steel, with a minor amount of cast iron. Both systems use Victaulic mechanical couplings (Victaulic Company) rather than welded joints. The joints in the condenser section of the system are deeply corroded, while the chilled water system is in good condition. The cause appears to be initial system pressure testing without biocide, followed by several months of no use at all. Microbially-influenced corrosion (MIC) started below the gaskets in the joints and could not be stopped. Polymerase chain reaction analysis allowed identification of the bacteria involved after the system was dismantled. The entire condenser water system had to be replaced.
Keywordsbiofilms corrosion DNA sequencing failure analysis microbially-influenced corrosion MIC polymerase chain reaction analysis Victaulic couplings
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- D.L. Gibbon and R.M. Donlan: “Microbially-Influenced Corrosion in Stainless Steel Tubing: A Case History and a Brief Review,” Paper 97-52, International Water Conference, Engineers Society of Western Pennsylvania, Pittsburgh, PA, 1997.Google Scholar
- D.L. Gibbon, C.L. Wiatr, and C. McGough: (1998) “Case Study of Complex Pitting Corrosion on 316L Stainless Steel: The Roles of Bacteria, Metallurgy and Chemistry,” Paper 98-23, International Water Conference, Engineers Society of Western Pennsylvania, Pittsburg, PA, 1998.Google Scholar