Since its introduction in 1824, cathodic protection (CP) technology has developed to become a fundamental tool for preventing corrosion on municipal infrastructure. Potable water storage tanks and piping, prestressed concrete cylinder pipe, reinforced concrete structures, bridges, parking structures, underground fuel tanks, and effluent treatment clarifiers […]
This paper will concern itself with the very basic fundamental cause of corrosion and its prevention. The fact is that metals corrode through sheer cussedness. They want to corrode. This perverse desire stems from the fact that it is more natural for a metal to […]
Watermain failures are a distressing problem for many municipalities. In some municipalities the cost of water main failures reaches astronomical proportions. It is not unusual for municipalities in densely populated urban areas to experience a failure frequency of one per year per mile of pipe, […]
The cost of repairing or replacing watermain piping perforated by corrosion is becoming a major item in many municipal budgets, and correspondingly in most individuals’ municipal taxes. Although it is understandable that cast iron failures occur both from a mechanical and age point of view, […]
Sharing of common corridors by gas pipelines and overhead power transmission lines is becoming quite common. However, electrical energy can be transferred from power transmission lines to pipelines through inductive, conductive and capacitive coupling. When a power transmission line runs in parallel with a pipeline […]
The quality of the indirect inspection data is a critical factor in conducting a successful ECDA program. New NACE standards (SP0207-20071 and TM 0109-092), improved instrumentation, experience sharing, and extensive training during the last several years, has resulted in a significant improvement in the accuracy […]
The ECDA process requires a continuous effort from the pipeline operator to improve the reliability of classification and prioritization criteria. Based on the results of the direct examinations, these criteria can be up-graded or down-graded as part of the retrospective evaluation and the number of […]
This paper describes the challenge of integrating specific types of ECDA indications, such as AC enhanced corrosion (ACEC) and DC interference (DCI), under the prioritization criteria recommended by NACE RP0502-2002. Starting from the observation that the risk of corrosion does not always increase with the […]
The 100mV cathodic polarization criterion is being used more extensively on piping in the oil and gas industry which has prompted a discussion on the limits of its use. This paper summarizes the technical literature on the validity of this criterion with respect to elevated […]
The paper describes the theoretical and practical aspects of merging two Indirect inspection tools (i.e. Close Interval Potential Survey and DC Voltage Gradient) into one integrated survey, as used in 2004 during an ECDA project covering more than 21 Km of gas pipelines in Southern […]
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