Copper corrosion in distribution system under stagnant flow conditions

Copper is the most widely used metal for household plumbing system. Copper corrosion of the distribution system can cause not only health effect but also damages the water supply infrastructure.; The main objective of this study is to understand the impact of secondary disinfectants on copper corrosion under stagnant flow conditions. Results show that in most of the cases the presence of disinfectant residual lowers the copper corrosion rate. This indicates that the copper corrosion may be caused predominantly by microbial activities. The corrosion inhibitor poly-phosphate also effects copper corrosion under stagnant condition. No correlation between the TOC and copper in solution was found except for the monochloramine pipes, where with increase of TOC copper concentration increased. Also under stagnant condition with higher alkalinity copper corrosion rate increases but for increase of pH it shows the reverse trends. (Abstract shortened by UMI.)...