- Volume 29 Issue 2
Regular high-strength carbon steel is currently the most commonly used pipe material for onshore and offshore pipelines. The corrosion of offshore pipelines is a major problem as they age. The collapse of these structures as a result of corrosion may have a heavy cost is lives and assets. Therefore, their monitoring and screening is a high priority for maintenance, which may ensure the integrity and safety of a structure. Monitoring risers and subsea pipelines effectively can be accomplished using eddy current inspection to detect the average remaining wall thickness of corroded low-alloy carbon steel pipelines through corrosion scaling, paint, coating, and concrete. A test specimen for simulating the offshore pipeline is prepared as a standard specimen for an analysis and experiment with differential bobbin eddy current sensors. Using encircling coils, the signals for the defect in the simulated specimen are analyzed and evaluated in experiments. Differential bobbin eddy current sensors can diagnose the defects in a specimen, and experiments have been carried out using the developed bobbin eddy current sensor. As a result, the most optimum coil parameters were selected for designing differential bobbin eddy current sensors.
Offshore pipeline;Non-destructive testing;Eddy current;Sensor;Corrosion
- API, 2007. Design and Installation of Offshore Production Platform Piping Systems. API RP 14E, American Petroleum Institute.
- DNV(Det Norske Veritas), 2007. Recommended Practice Erosive Wear in Piping Systems. Rev. 4.2 Det Norske Veritas.
- Lee, J.H., Kim, S.Y., 2014. Design Sensitivity and Optimum Design of Monopile Support Structure in Offshore Wind Turbine. Journal of the Society of Naval Architects of Korea, 51(1), 78-87. https://doi.org/10.3744/SNAK.2014.51.1.78
- Lee, J.H., Kim, S.Y., Kim, M.H., Shin, S.C., Lee, Y.S., 2014. Design Optimization and Reliability Analysis for the Jacket Support Structure of a 5MW Offshore Wind Turbine. Journal of Ocean Engineering and Technology 28(3), 218-226. https://doi.org/10.5574/KSOE.2014.28.3.218
- Moore, P.O., 1986. Nondestructive Testing Handbook 3rd edition, Vol.5. Electromagnetic Testing. ASNT, 130-131.
- Rao, B.P.C., 2007. Practical Eddy Current Testing, ISNT, 24-25.
- Restrepo, C.E., Simonoff, J.S., Zimmerman, R., 2009. Causes, Cost Consequences, and Risk Implications of Accidents in US Hazardous Liquid Pipeline Infrastructure. International Journal of Critical Infrastructure Protection, 2(1), 38-50. https://doi.org/10.1016/j.ijcip.2008.09.001
- Rocorr IEC Service, 2013. In-Line High Resolution Internal Metal Loss Detection and Sizing, www.rosen-group.com.
- Shull, P.J., 2002. Nondestructive Evaluation: Theory, Techniques, and Applications. CRC press.
- Wika, S.F., 2012. Pitting and Crevice Corrosion of Stainless Steel under Offshore Conditions. NTNU.
- Xu, X., Liu, M., Zhang, Z., Jia, Y., 2014. A Novel High Sensitivity Sensor for Remote Field Eddy Current Non-Destructive Testing Based on Orthogonal Magnetic Field. Sensors. 2014; 14(12):24098-24115. https://doi.org/10.3390/s141224098
- Yu, S.Y., Choi, H.S., Lee, S.K., Kim, D.K., 2014. Trend and Review of Corrosion Resistant Alloy (CRA) for Offshore Pipeline Engineering. Journal of Ocean Engineering and Technology 28(1), 85-92. https://doi.org/10.5574/KSOE.2014.28.1.085