By American National Standards Institute.; American Water Works Association
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Extra resources for AWWA standard [for] polyethylene encasement for ductile-iron pipe systems
For each of these tests, results are categorized according to their contribution to corrosivity. 1). When results of these five tests/ observations are available, the assigned points are totaled. If the sum is equal to 10 or more, the soil is corrosive to ductile-iron pipe, and protection against exterior corrosion should be provided. This system of evaluation is limited to soil corrosion and does not include consideration of stray direct current. General. 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.
Every effort should be made to acquire these data by questioning local officials and, if possible, by observing existing installations. Soil-Test Evaluation When the soil-test procedures described in this standard are employed, the following tests are used in evaluating corrosivity of the soil: resistivity, pH, redox potential, sulfides, and moisture. For each of these tests, results are categorized according to their contribution to corrosivity. 1). When results of these five tests/ observations are available, the assigned points are totaled.
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. 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.