Abstract
Where red‐water, taste, and odor problems persist in distribution systems and defy the conventional methods of correction, cleaning and cement‐mortar lining of the pipe will provide the solution to the problem. Cleaning and lining greatly improves the carrying capacity of old, tuberculated water mains. Hazen‐Williams coefficients in the problem area were raised from 30‐43 to an average of 115 for 6‐, 8‐, and 12‐inch pipe. This article discusses an effective troweling device that made these results possible, and improved the C value of reconditioning distribution grid mains in Philadelphia. The average C value of 115 for 6‐in. pipe was a C value of 25, a greater improvement over untroweled lining previously applied in Philadelphia.
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