The corrosion susceptibility of steel storage tank systems is now well recognized by government regulatory agencies and most Provincial governments in Canada have introduced legislation making it mandatory that new tank installations incorporate corrosion control equipment and that existing tanks and piping be upgraded to […]
Soil side corrosion of surface storage tanks can be a serious problem. In many industries the life of the tank is limited by external corrosion of the tank bottom. Cathodic protection (CP) is a cost effective technique used to eliminate soil side corrosion and hence […]
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 […]
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