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This paper explores four specific modes of failure. 1. The dezincification of brass. 2. Problems that plague galvanized pipe. 3. Graphitization of cast iron. 4. Pitting corrosion of stainless steel due to effects of manganese.
Key words: aqueous corrosion, corrosion mitigation, building water systems, dezincification, graphitization, plumbing, fire suppression, sprinkler pipes, pitting corrosion by manganese.
Galvanized steel pipe is protected by a layer deposited by hard water, but may suffer corrosion in soft water. Presented are case studies of corrosion in galvanized water piping in a stadium, hotel, and county government building. Details of corrosion mechanism and mitigation strategies are also discussed.
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Ccase histories of four fire protection systems where corrosion resulted in premature discharge/leakage causing significant property damage or facilities downtime. Tuberculation of galvanized piping. Two cases of dealloying (dezincification) corrosion of brass sprinkler heads. Microbiologically induced corrosion (MIC) corrosion.
This paper demonstrates a spreadsheet tool developed to evaluate life-cycle costs for specific cases using economic principles and professionally developed cost estimates.