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The use of ductile iron pipe (DIP) for water and wastewater pipelines in the United States began during the 1960's and by the 1970's DIP had largely replaced cast iron pipe (CIP) for new pipelines. Over the years there have been many theories presented regarding corrosion of ductile iron pipe and the effectiveness of polyethylene encasement as a corrosion control measure. Sound corrosion engineering is based on corrosion science and corrosion theories should also be based on corrosion science. Several of the ductile iron corrosion theories and the relevant corrosion science associated with them are discussed in this paper.
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This paper presents several case histories where ductile iron pipeline sections have been investigated to ascertain the corrosioncontrol benefits of polyethylene encasement. Investigative procedures, included cell-to-cell potential surveys, side-drain technique measurements, in-situ and laboratory soil tests, pipe-to-soil potential measurements and excavation inspections.
A two-year study of corrosion and protection of ductile iron pipe. Field and laboratory evaluations of short and long term polarization rates. Corrosion rate reduction and cathodic current criterion. Benefits of the traditional, standard asphaltic shop coating. A database of 1379 inspections of buried iron water lines. Result: A risk based protection design strategy for buried ductile iron pipelines.