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In the present paper, characteristics of the AC corrosion problem are demonstrated using laboratory results and field measurements as examples. Evidence has been given that the AC corrosion mechanisms involve alkalization of the environment nearby the coating defect, and in combination with AC, corrosion may be induced.
In the present paper, characteristics of the AC corrosion problem are demonstrated using laboratory results and field measurements as examples. Evidence has been given that the AC corrosion mechanisms involve alkalization of the environment nearby the coating defect, and in combination with AC, corrosion may be induced. Accordingly, besides the level of induced AC voltage, the CP level has a dramatic influence on the AC corrosion process. Excessive CP increases the AC corrosion rate and should therefore be avoided. Increasing the CP seems definitely to be the wrong solution to a potential AC corrosion problem.
Keywords: AC corrosion mechanisms, alkalization, cathodic protection requirements.
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.
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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.
A close-interval potential (CIP) data survey on ~154 km of Crude Oil/Gas pipeline networks. This aim was to generate corrosion data to determine weak sections of the pipelines/flowlines and, to ascertain the effectiveness of the CP system and integrity of the Crude Oil/Gas pipeline networks. The pipeline networks were found safe for continued operation under its present condition.