Full Description

This research analyzed corrosion and corrosioncontrol of ductile- and gray-iron pipe by drawing on alarge database of 1,379 pipe specimens and inspectionsderived from the test programs of the Ductile Iron PipeResearch Association. The study's objectives weretwofold: evaluate the accuracy of the 10-point soilevaluation system published in the ANSI/AWWA Standardfor Polyethylene Encasement for Ductile-Iron PipeSystems; and, assess the effectiveness of polyethyleneencasement for corrosion control of ductile-iron pipe.Study findings indicated that the 10-point system isan accurate method for evaluating the corrosivity ofsoils and predicting whether corrosion protection iswarranted. In less-aggressive soils, asphaltic ductile-ironpipe did not require additional corrosion protection.Polyethylene encasement controlled corrosion inall soils tested except severe environments and, whenproperly installed, provided protection beyond thedesign life of the pipe.Water suppliers can use the 10-point evaluation systemto assess the corrosivity of soils where pipe will beburied. For those soils where corrosion control protectionis warranted, polyethylene encasement provides an effective,economical, and low-maintenance solution. Includes 15 references, tables, figures.

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Edition: Vol. 97 - No. 6 Published: 06/01/2005 Number of Pages: 11 File Size: 1 file , 320 KB