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The premature failure of water pipelines has resulted in an increased awareness that preventing external corrosion on water mains is critical. Cathodic protection which has been in wide use for decades in the oil and gas industry has been recognized as a cost effective method to prevent external corrosion and premature failures. Several case histories are included in this paper that show how cathodic protection and external bonded coatings have been applied to ductile iron pipelines. The case histories include a wide range of piping sizes to show the effectiveness of cathodic protection and external bonded coatings for virtually all sizes of pipe.
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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.
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.