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      Design and Testing of USEPA'S Flint Pipe Rig for Corrosion Control Evaluation

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          Abstract

          The US Environmental Protection Agency's Office of Research and Development designed, fabricated, and installed four pipe rigs in Flint, Mich., to help the city optimize corrosion control. The lead service line (LSL) pipe loops were constructed of polyvinyl chloride pipe and fittings and welded steel channel frames. Each pipe rig consisted of four approximately 4 ft‐long sections of 0.75 in. inside diameter lead pipe that were excavated from homes fed by the Flint distribution system. The rigs were operated on a set daily on/off schedule such that a specified amount of water passed through each pipe using a solenoid valve‐operated timer system. Solenoid problems resulted in sporadic and enhanced daily flow volume (but no flow rate changes) that prevented restabilization of pipe scales. Lead levels were relatively sporadic and statistically different during this period. After the solenoids were replaced, the lead pipe rigs were successfully conditioned, and lead release with consistent influent water chemistry became relatively stable. Average lead levels across all 16 loops ranged between approximately 2 and 5 μg/L after the solenoid replacement. The lead results were consistent with levels measured from LSLs from homes in the city during sequential sampling efforts.

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          Author and article information

          Contributors
          Journal
          10.1002/(ISSN)1551-8833
          Journal ‐ American Water Works Association
          J Am Water Works Assoc
          John Wiley & Sons, Inc. (Hoboken, USA )
          0003-150X
          1551-8833
          29 August 2018
          Affiliations
          Cincinnati; Ohio US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Water Systems Division, Drinking Water Treatment and Distribution System Branch
          Chicago; Ill US Environmental Protection Agency, Region 5, Water Division
          10.1002/awwa.1127
          Published 2018. This article is a U.S. Government work and is in the public domain in the USA

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