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This paper demonstrates a spreadsheet tool developed to evaluate life-cycle costs for specific cases using economic principles and professionally developed cost estimates.
The cost of corrosion control for water infrastructure continues to escalate, making data-based corrosion management even more important for budget planning. This paper demonstrates a spreadsheet tool developed to evaluate life-cycle costs for specific cases using economic principles and professionally developed cost estimates. It is a follow-up to the CORROSION 2017 paper evaluating the cost of protective coatings options for penstock relinings. The new work focuses on the cost-effectiveness of including cathodic protection (CP) in conjunction with protective coatings. The output includes the break-even point at which the CP system investment is justified by the extended service life of the coating system. The case study is a large gate in freshwater protected by an epoxy coating and compares the coating service life when paired with a galvanic anode CP system, an impressed current CP system, or no CP system.
Key words: Cost of corrosion control, life-cycle cost, water infrastructure, protective coatings, cathodic protection, hydraulic steel gates
This paper looks at one major water and wastewater municipality with an established system for external corrosion control. Details of their systematic approach, how it developed and is applied, are included.
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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.
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.