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51312-01608-In-Line Cathodic Protection Current Measurement - A Case Study

Picture for In-Line Cathodic Protection Current Measurement - A Case Study
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Product Number: 51312-01608-SG
ISBN: 01608 2012 CP
Author: Dennis C. Janda
Publication Date: 2012
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$20.00
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The operator of a 20-inch (508mm) 220 mile (354km) crude oil pipeline constructed in the 1950’s suspected this active line had non-documented electrical connections to several abandoned bare pipelines in the same right of way. This caused challenges in adjusting the cathodic protection (CP) system for optimum and efficient corrosion protection. Conventional methods of locating these bonds had been attempted over the years with limited success. In-line cathodic protection current measurement technology was employed to locate and quantify the affect of the buried bonds and to confirm complete protection of the pipeline. In-line CP current measurement technology measures only the CP current that accumulates and flows on the subject pipeline thereby eliminating many of the obstacles that make conventional methods of CP inspection prone to interpretation error. The in-line CP current measurement tool run was successful. The tool located and quantified twenty-seven (27) undocumented bonds. It also found six (6) undocumented current sources that were adding to the protection of the line. In-line cathodic protection current measurement technology is proving to be a valuable tool in providing pipeline operators with CP and current flow data that has been difficult to obtain with conventional technologies. This paper will present a case history of the in-line CP inspection of this pipeline providing data regarding the pipeline’s physical configuration details of the in-line CP current measurement inspection results and findings from the field investigation. Keywords: Cathodic Protection Current In-line Inspection CPCM Current Measurement
The operator of a 20-inch (508mm) 220 mile (354km) crude oil pipeline constructed in the 1950’s suspected this active line had non-documented electrical connections to several abandoned bare pipelines in the same right of way. This caused challenges in adjusting the cathodic protection (CP) system for optimum and efficient corrosion protection. Conventional methods of locating these bonds had been attempted over the years with limited success. In-line cathodic protection current measurement technology was employed to locate and quantify the affect of the buried bonds and to confirm complete protection of the pipeline. In-line CP current measurement technology measures only the CP current that accumulates and flows on the subject pipeline thereby eliminating many of the obstacles that make conventional methods of CP inspection prone to interpretation error. The in-line CP current measurement tool run was successful. The tool located and quantified twenty-seven (27) undocumented bonds. It also found six (6) undocumented current sources that were adding to the protection of the line. In-line cathodic protection current measurement technology is proving to be a valuable tool in providing pipeline operators with CP and current flow data that has been difficult to obtain with conventional technologies. This paper will present a case history of the in-line CP inspection of this pipeline providing data regarding the pipeline’s physical configuration details of the in-line CP current measurement inspection results and findings from the field investigation. Keywords: Cathodic Protection Current In-line Inspection CPCM Current Measurement
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High Voltage Direct Current Interference on Buried Pipelines: Case Study and Mitigation Design

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Field tests found that a natural gas pipeline system was interfered by a high voltage direct current electrode. Interference level was computed and agreed with measured values, validating the model. The effectiveness of various mitigation methods was computed and discussed,

 
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51318-11218-A Case Study of Soil-Side Corrosion of Aboveground Storage Tanks in the Middle East

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