Effectiveness assessment of buried pipeline’s cathodic protection system by CIPS and DCVG techniques
Abstract
The Close Interval Potential Survey (CIPS) technique is targeted at assessing the cathodic protection eff ectiveness over the entire length of the pipeline. Direct Current Voltage Gradient (DCVG) survey, based on measuring the voltage gradients in the soil above a cathodically protected pipeline, is the most accurate method available to size and locate pipe coating defects without direct access. In this paper, the authors present the principles of combining DCVG and CIPS techniques for actual assessment of buried pipeline’s cathodic protection eff ectiveness and the results obtained by using this technique.
References
NACE RP0169-2002. Control of external corrosion on underground or submerged metallic piping systems.
ISO 15589-1-2003. Petroleum and natural gas industries - Cathodic protection of pipeline transportation systems - Part 1: On land pipelines. www.iso.org.
Ronald L.Bianchetti. Survey methods and evaluation techniques. Peabody’s Control of Pipeline Corrosion (2nd edition). National Association of Corrosion Engineers. 2001; p. 65 - 100.
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