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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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Concerns related to stray DC interference. Including safety, testing, documentation and lessons learned. Also addressed are DC powered transit systems and other unordinary sources of DC interference.
Methodology, observations and analysis of using pulse width modulated (PWM) DC power source rather than a steady state DC power source on a buried pipeline sample.
This paper summarizes the results of ten years of External Corrosion Direct Assessment (ECDA) application on more than 100 projects and includes a number of important lessons learned during the process.
地上检测技术评价地下管道 涂层情况的测试方法 Chinese Translation Aboveground evaluation of the coating condition of underground metallic pipelines. Surveys: • Alternating current (AC) attenuation • Direct current (DC) • AC-voltage gradient • Pearson.