Abstract
The safety of submarine pipelines is largely influenced by free spans and corrosions. Previous studies on free spans caused by seabed scours are mainly based on the stable environment, where the background seabed scour is in equilibrium and the soil is homogeneous. To study the effects of background erosion on the free span development of subsea pipelines, a submarine pipeline located at the abandoned Yellow River subaqueous delta lobe was investigated with an integrated surveying system which included a Multibeam bathymetric system, a dual-frequency side-scan sonar, a high resolution sub-bottom profiler, and a Magnetic Flux Leakage (MFL) sensor. We found that seabed homogeneity has a great influence on the free span development of the pipeline. More specifically, for homogeneous background scours, the morphology of scour hole below the pipeline is quite similar to that without the background scour, whereas for inhomogeneous background scour, the nature of spanning is mainly dependent on the evolution of seabed morphology near the pipeline. Magnetic Flux Leakage (MFL) detection results also reveal the possible connection between long free spans and accelerated corrosion of the pipeline.
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References
Adedipe, O., 2011. Characterization of external induced corrosion degradation of Ajaokuta-Abuja gas pipeline system, Nigeria. International Journal of Engineering Science and Technology, 3(11): 8061–8068.
Beavers, J. A., Thompson, N. G., and Technologies, C. C., 2006. External Corrosion of Oil and Natural Gas Pipelines. ASM Handbook, Volume 13C, 1015–1025.
Budiea, A. M. A., Yahaya, N., and Nor, N. M., 2012. Corrosion of API X70 steel due to near shore sediment. International Journal of Civil & Environmental Engineering, 12(3): 84–88.
Cataño-Lopera, Y. A., and García, M. H., 2007. Geometry of scour hole around, and the influence of the angle of attack on the burial of finite cylinders under combined flows. Ocean Engineering, 34(5): 856–869.
Çevik, E., and Yüksel, Y., 1999. Scour under submarine pipelines in waves in shoaling conditions. Journal of Waterway, Port, Coastal and Ocean Engineering, 125(l): 9–19.
Chiew, Y. M., 1990. Mechanics of local scour around submarine pipelines. Journal of Hydraulic Engineering, 116(4): 515–529.
Choi, H. S., 2001. Free spanning analysis of offshore pipelines. Ocean Engineering, 28: 1325–1338.
Chu, Z. X., Sun, X. G., Zhai, S. K., and Xu, K. H., 2006. Changing pattern of accretion/erosion of the modern Yellow River (Huanghe) subaerial delta, China: Based on remote sensing images. Marine Geology, 227: 13–30.
Clukey, E. C., Kulhawy, F. H., Liu, P. L. F., and Tate, G. B., 1985. The impact of wave loads and pore-water pressure generation on initiation of sediment transport. Geo-Marine Letters, 5: 177–183.
Dey, S., and Singh, N. P., 2007. Clear-water scour depth below underwater pipelines. Journal of Hydro-Environment Research, 1(2): 157–162.
DNV, 2006. Free Spanning Pipelines. Recommended practice DNV-RP-F105, Det Norske Veritas, Høvik, Norway, 1–45.
DNV, 2008. Structural Analysis of Piping Systems. Recommended practice DNV-RP-D101, Det Norske Veritas, Høvik, Norway, 1–32.
DNV, 2010. Corroded Pipelines. Recommended practice DNV-RP-F101, Det Norske Veritas, Høvik, Norway, 1–42.
Foray, P., Bonjean, D., Michallet, H., and Mory, M., 2006. Fluid-soil-structure interaction in liquefaction around a cyclieally moving cylinder. Journal of Waterway, Port, Coastal, and Ocean Engineering, 132(4): 289–299.
Grant, W. D., and Madsen, O. S., 1982. Movable bed roughness in unsteady oscillatory flow. Journal of Geophysical Research, 87: 469–481.
Jia, Y. G., Shan, H. X., Yang, X. J., Meng, X. M., Chang, F. Q., and Zheng, J. W., 2011. Sediment Dynamics and Geology Hazards in the Estuary of Yellow River. Science Press, Beijing, 24–130.
Li, G. X., Wei, H. L., Yue, S. H., Cheng, Y. J., and Han, Y. S., 1998. Sedimentation in the Yellow River delta, part II: Suspended sediment dispersal and deposition on the subaqueous delta. Marine Geology, 149: 113–131.
Li, G. X., Zhuang, K. L., and Wei, H. L., 2000. Sedimentation in the Yellow River delta. Part III. Seabed erosion and diapirism in the abandoned subaqueous delta lobe. Marine Geology, 168: 129–144.
Mao, Y., 1988. Seabed scour under pipelines. Proceedings of 7th International Conference on Offshore Mechanics and Arctic Engineering, Houston, TX, 33–38.
Milliman, J. D., and Meade, R. H., 1983. World-wide delivery of river sediment to the oceans. Journal of Geology, 91: 1–21.
Pu, J. J., Xu, J. S., and Li, G. X., 2013. Experimental study on damping characteristics of pipe vibration in liquefied silt. The 23rd International Offshore and Polar Engineering Conference (ISOPE), Alaska, USA, 266–271.
Sassa, S., Takayama, T., Mizutani, M., and Tsujio, D., 2006. Field observations of the build-up and dissipation of residual pore water pressures in seabed sands under the passage of storm waves. Journal of Coastal Research, 39(Special Issue): 410–414.
Srikanth, S., Sankaranarayanan, T. S. N., Gopalakrishna, K., Narasimhan, B. R. V., Das, T. V. K., and Das, S. K., 2005. Corrosion in a buried pressurised water pipeline. Engineering Failure Analysis, 12: 634–651.
Sumer, B. M., and Fredsoe, J., 1990. Scour below pipeline in waves. Journal of Waterway, Port, Coastal and Ocean Engineering, 116(3): 307–323.
Sumer, B. M., and Fredsoe, J., 2002. The Mechanics of Scour in the Marine Environment. World Scientific, Singapor, 15–148.
Sumer, B. M., Truelsen, C., Sichmann T., and Fredsøe, J., 2001. Onset of scour below pipelines and self-burial. Coastal Engineering, 42(4): 313–335.
Wang, H. J., Yang, Z. S., Li, G. X., and Jiang, W. S., 2006. Wave climate modeling on the abandoned Huanghe wave climate modeling on the Abandoned Huanghe. Journal of Coastal Research, 22(4): 906–918.
Xu, J. S., Li, G. X., and Horrillo, J. J., 2009. Local scour and self-burial of a submarine pipeline on cohesive seabed. ASCE International Conference on Pipelines and Trenchless Technology (ICPTT), 361: 996–1004.
Xu, J. S., Li, G. X., Dong, P., and Shi, J. H., 2010. Bedform evolution around a submarine pipeline and its effects on wave-induced forces under regular waves. Ocean Engineering, 37: 304–313.
Xu, J. S., Li, G. X., Horrillo, J. J., Yang, R. M., and Cao, L. H., 2010. Calculation of maximum allowable free span length and safety assessment of the DF1-1 submarine pipeline. Journal of Ocean University of China, 9(1): 1–10.
Xu, J. S., Pu, J. J., and Li, G. X., 2012. Field observations of seabed scours around a submarine pipeline on cohesive bed. Advances in Computational Environment Science, 142: 23–33.
Yasa, R., 2011. Prediction of the scour depth under submarine pipelines — in wave condition. Journal of Coastal Research, 64: 627–630.
Yu, L. S., 2002. The Huanghe (Yellow) River: A review of its development, characteristics, and future management issues. Continental Shelf Research, 22: 389–403.
Zang, Q. Y., 1996. Nearshore Sediment Along the Yellow River Delta. Ocean Press, Beijing, 11–51.
Zhou, C. Y., Li, G. X., Dong, P., Shi, J. H., and Xu, J. S., 2011. An experimental study of seabed responses around a marine pipeline under wave and current conditions. Ocean Engineering, 38: 226–234.
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Wen, S., Xu, J., Hu, G. et al. A field investigation on the effects of background erosion on the free span development of a submarine pipeline. J. Ocean Univ. China 14, 621–628 (2015). https://doi.org/10.1007/s11802-015-2458-7
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DOI: https://doi.org/10.1007/s11802-015-2458-7