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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.
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. ~ This work also demonstrated the protective qualities of the annealing oxide with asphaltic shop coat, and reaffirmed the life extension benefits of applying cathodic protection currents at lower densities than reflected in typical design practices. 2 The model is based upon the analysis of data from 1,379 inspections involving more than 300 soil conditions.
Keywords: external corrosion, ductile iron pipe, modeling, cathodic protection, 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.
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The effect of seasonal changes on the protection of pipelines in high-resistivity soil. The nature and magnitude of the seasonal fluctuations. Corrosion rates are low even when compliance with a given CP criterion cannot be demonstrated.
The objective of the research summarized in this paper was to define pipeline conditions where use of the 100-mV polarization criterion may be conducive to possible SCC problems. Paper Number 01592, presented at Corrosion/2001, summarized Part 1 of the research, in which the previous research results were analyzed. In this paper, the results of the laboratory testing are presented.