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The most important performance indicator for cathodic protection (CP) is the structure-to-electrolyte potential. In most of coated on-shore pipeline, the resistance between the reference electrode and the pipe-to-soil surface boundary is too significant to be ignored. The IR drop caused by CP current is a measurement error. It is stipulated in many CP standards that IR component to be evaluated and excluded while assess the pipe-to soil potential performance in pipeline integrity management.
For a well-coated pipeline, the most practical monitoring technique is to use synchronised interrupting technique by bring the current to zero and measure the potential momentary after the current source is off. By switching all sources of current to near zero, the measured potential is approaching to polarization potential by virtually eliminating the IR component in the CP electrical circuit. This technique has been widely accepted and adopted in pipeline industry for decades.
Most of modern pipelines are electrically isolated from above ground facilities, either through a flange isolation kit (FIK) or Monolithic Isolation Joint (MIJ) . This is to prevent excessive current drain which may result in CP being uneconomical or impractical. They prevent the CP current flowing to other facilities and equipment that otherwise electrically connected to pipeline. However, in practice, the effectiveness of these electrical joints can be compromised by internal debris deposition , which leads to the electrical short of pipeline to above ground facilities and their associated grounding system, from time to time. The earthing system, governed by local regulation and standards, is typically copper or copper-clad steel rode conductors. The implication of this electrical short to such earthing systems in CP measurement has not been fully explored or .fully understood by the industry.
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|||CeoCoR, “Application of Coupons and Probes for Cathodic Protection Monitoring Purposes,” 2013.|
|||NACE, “SP0104 The Use of Coupon for Cathodic Protection Monitoring Applications,” 2014.|
Full paper can also be accessed from link below.