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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.
The results of a two-year study of corrosion and corrosion protection characteristics of ductile iron pipe are presented. Included are field and laboratory evaluations related to short term and long term polarization rates under varying conditions; corrosion rate reduction and corresponding cathodic current criterion; and the corrosion protection benefits of the traditional, standard asphaltic shop coating. This information was then analyzed in conjunction with an extensive database from 1379 physical inspections of buried iron water lines. The result of the study is a risk based Corrosion protection design strategy for buried ductile iron pipelines.
Key Words Ductile Iron, Ductile Iron Pipe, Corrosion of Ductile Iron Pipe, Coating of Ductile Iron Pipe, Cathodic Protection of Ductile Iron Pipe, Corrosion Protection Design Decision Model
Numerous studies and papers have addressed the need and technical merits of various external corrosion protection scenarios for ductile iron pipe. Most recently, a Design Decision Model was developed to select the optimum method of corrosion protection, considering both the likelihood and consequence of failure.
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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.
New cathodic protection (CP) criteria were developed based on AC and DC current densities measured using coupons. Using these criteria, the design of CP systems for newly constructed pipelines, paralleling high voltage AC power lines, and DC rail transit systems, was successfully performed.