Abstract

DC interference of cathodic protection systems on adjacent buried pipelines is a big threat to pipeline integrity. In northwest China, a pigging station on a natural gas pipeline has been reconstructed and expanded to be a compressor station. Some newly buried pipelines and grounding metal were too close to the existing impressed-current anode for the main line outside the station. As a result, typical DC interference of the cathodic protection system was observed. In order to protect the pipelines buried in the station, a regional cathodic protection system was applied, and the outcome was satisfactory.

Keywords:
corrosion inhibition, materials and corrosion, flowline corrosion, oilfield chemistry, piping design, piping simulation, h2s management, cathodic protection system, regional cathodic protection system, houston
Subjects:
Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Piping design and simulation, Materials and corrosion, Corrosion inhibition and management (including H2S and CO2)
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2015. NACE International
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