AWWA standard [for] polyethylene encasement for ductile-iron by American National Standards Institute.; American Water Works

By American National Standards Institute.; American Water Works Association

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3 not detrimental to the expected life of the system, unless the pipeline comes close to an impressed-current, cathodic-protection anode bed where the current density is high. When ductile iron pipelines are exposed to high-density stray current environments, the pipeline should be rerouted or the anode bed relocated. If neither of these options is feasible, the ductile iron pipe in this area should be electrically bonded together, electrically isolated from adjacent pipe, polyethylene encased, and appropriate test leads and “current drain” installed.

5], low or negative redox potential [negative to +100 mV], and the presence of sulfides [positive or trace]); and (3) where the water table is intermittently or continually above the invert of the pipe. Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Licensee=Earth Tech Inc/5906698001, User=Yanez, Simon Not for Resale, 04/21/2008 18:05:05 MDT This page intentionally blank. --``,`,,``,,`,,```,`,,``,,,``,,-`-`,,`,,`,`,,`--- Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Licensee=Earth Tech Inc/5906698001, User=Yanez, Simon Not for Resale, 04/21/2008 18:05:05 MDT --``,`,,``,,`,,```,`,,``,,,``,,-`-`,,`,,`,`,,`--- AWWA is the authoritative resource for knowledge, information, and advocacy to improve the quality and supply of water in North America and beyond.

These notes address only ductile-iron pipe, the soil environment in which the pipe will serve, and the methods of determining a need for polyethylene encasement. Uniquely Severe Environments Research has shown that polyethylene encasement alone is a viable corrosion protection system for ductile- and gray-iron pipe in most environments. 5], low or negative redox potential [negative to +100 mV], and the presence of sulfides [positive or trace]); and (3) where the water table is intermittently or continually above the invert of the pipe.

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