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AWWA WQTC69290
- A Simple Approach to Assessing Copper Pitting Corrosion Tendencies and Developing Control Strategies
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
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The objective of this research wasto assess the effectiveness of a simple pipe loop system and protocol to predict localizedcorrosion of copper plumbing in distribution systems, and to assess treatment alternatives in a drinking water that has been associatedwith customer complaints of pinhole leaks. Regular examination of the internal surface ofcopper pipes positioned in the loop revealed signs of localized corrosion (isolated moundsof corrosion byproducts) after only 72 days. Close examination of pipe sections removedfrom the loops after 100 days clearly showed that localized corrosion was taking place.Cross-section analysis of the pipe showed pits as deep as 0.75mm that were covered by athin membrane and mound of blue-green corrosion products. The study showed thatsimple, inexpensive copper pipe loops can be useful in predicting pitting tendencies ofcopper piping used for drinking water, as well as to assess the effectiveness of treatmentalternatives. Includes 3 references, figures.
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