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Wednesday, March 17, 2010: 1:25 PM
213 A/B (Henry B. Gonzales Convention Center)
Cathodic Protection – It’s All About Current
Dennis Janda
Baker Hughes Incorporated
2301 Oil Center Court
Houston, TX 77073
The external pipeline corrosion control field is one that has seen great change over the years from a regulatory standpoint, but one that has seen very little change in new technology to assist us in monitoring the effectiveness of our efforts. Recently a new tool for the corrosion professional’s toolbox was introduced – CPCMTM Cathodic Protection Inspection Services. A.W. Peabody stated “When the amount of current flowing (to the pipe) is adjusted properly, it will overpower corrosion current discharging from all anodic areas on the pipeline and there will be a net current flow onto the pipe surface at these points. The entire surface will then be cathodic and the protection complete.” The CPCMTM tool is an inline inspection tool that measures the voltage drop in the pipe wall that is caused by the accumulation and flow of CP current. This voltage is converted to current using Ohm’s law and the data is graphically represented. This paper will explain the benefits of CPCMTM technology and present case histories of recent inspections.
Keywords: Cathodic Protection, Current, Inline Inspection, CPCM, Current Measurement
Dennis Janda
Baker Hughes Incorporated
Houston, TX 77073
The external pipeline corrosion control field is one that has seen great change over the years from a regulatory standpoint, but one that has seen very little change in new technology to assist us in monitoring the effectiveness of our efforts. Recently a new tool for the corrosion professional’s toolbox was introduced – CPCMTM Cathodic Protection Inspection Services. A.W. Peabody stated “When the amount of current flowing (to the pipe) is adjusted properly, it will overpower corrosion current discharging from all anodic areas on the pipeline and there will be a net current flow onto the pipe surface at these points. The entire surface will then be cathodic and the protection complete.” The CPCMTM tool is an inline inspection tool that measures the voltage drop in the pipe wall that is caused by the accumulation and flow of CP current. This voltage is converted to current using Ohm’s law and the data is graphically represented. This paper will explain the benefits of CPCMTM technology and present case histories of recent inspections.
Keywords: Cathodic Protection, Current, Inline Inspection, CPCM, Current Measurement
See more of: Cathodic Protection Criteria and Application Symposium - STG 05
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See more of: Technical Symposia