Ocean Systems Engineering

  • 제1권1호
  • /
  • Pages.59-72
  • /
  • 2011
  • /
  • 2093-6702(pISSN)
  • /
  • 2093-677X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Free spans monitoring of subsea pipelines

  • Elshafey, Ahmed A. (Faculty of Engineering, Memorial University of Newfoundland) ;
  • Haddara, M.R. (Faculty of Engineering, Memorial University of Newfoundland) ;
  • Marzouk, H. (Faculty of Engineering, Architecture and Science, Ryerson University)
  • 투고 : 2010.11.23
  • 심사 : 2011.03.11
  • 발행 : 2011.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

The objective of this work is to investigate the possibility of using the longitudinal strain on the surface of a pipe to determine the inception of dangerous free spanning. The long term objective is to develop an online monitoring technique to detect the development of dangerous free spanning in subsea pipelines. This work involves experimental study as well as finite element modeling. In the experiments, the strains at four points on a cross section of a pipeline inside the free span zone are measured. Pipes with different boundary conditions and different diameter to length ratios were tested. The pipe is treated as a simple beam with fixed-fixed or simply supported boundary conditions. The variation of the strains as a function of the diameter to length ratio gives a pointer to the inception of dangerous free spanning. The finite element results agree qualitatively with the experiments. The quantitative discrepancy is a result of the difficulty to replicate the exact boundary conditions that is used by the finite element program.

키워드

참고문헌

  1. Park, H.I. and Kim, C.h. (1997), "Analytical Methods for the determination of Allowable free Lengths of Subsea Pipelines", Proceedings of the 7th International Offshore and Polar engineering Conference, Honolulu, USA.
  2. Kapuria, S, Salpekar, V.Y. and Sengupta, S. (1998), "Effect of axial force on allowable free spans of submarine Pipelines", Proceedings of the 8th International Offshore and Polar Engineering Conference, Montreal, QC, Canada.
  3. Choi, H.S. (2001), "Free spanning analysis of offshore pipelines", Ocean Eng., 28(10), 1325-1338. https://doi.org/10.1016/S0029-8018(00)00071-8
  4. Soreide, T., Paulsen, G. and Nielsen, F.G. (2001), "Parameter Study of Long Free Spans", Proceedings of the 11th International Offshore and Polar Engineering Conference, Stavanger, Norway.
  5. Fyrileiv, O. and Mork, K. (2002), "Structural response of pipeline free spans based on beam theory", Proceedings of the 21st International Conference on Offshore Mechanics and Arctic Engineering, Oslo, Norway.
  6. Mork, K., Fyrileiv, O., Chezhian, M., Nielsen, F.G. and Soreide, T. (2003), "Assessment of VIV induced fatigue in long free spanning pipelines", Proceedings of the 22nd International Conference on Offshore Mechanics and Fig. 19 Ratio of standard deviations of axial strains of point 2 and point 4 (pipe supported by soil) Arctic Engineering, Cancun, Mexico.
  7. DNV-RP-F105 (2006). Free spanning pipelines: Recommended practice, Det Norske Veritas, Norway.
  8. Li, X., Dong, R., Jin, Q and Zhou, J. (2008), "Hydrodynamic force model on free spanning pipeline subjected to seismic excitations", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril, Portugal.
  9. Zeinoddini, M., Sadrossadat, S.M. and Parke, G.A.R. (2008), "Nonlinear seismic analysis of free spanning submarine pipelines: effects of pipe-water interaction", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril, Portugal.
  10. Pereira, A., Bomfimsilva, C., Franco, L., Tardelli, L. and Eigbe, U. (2008), "In-place free span assessment using finite element analysis", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril, Portugal.
  11. Jin, W., Shao, J. and Zhang, E. (2003), "Basic strategy of health monitoring on submarine pipeline by distributed optical fiber sensor", Proceedings of the 22nd International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Cancun, Mexico.
  12. Flex-Henry, A. and Lembeye, P. (2004), "Flexible pipes in-service monitoring", Proceedings of the 23rd International Conference on Offshore Mechanics and Arctic Engineering, Vancouver, BC, Canada.
  13. Nikles, M. and Briffod, F. (2005), "Greatly extended distance pipeline monitoring using fibre optics", Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering, Halkidiki, Greece.
  14. Jin, W. and Shao, J. (2006), "A practical algorithm on health monitoring of submarine pipeline and its application", Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering, Hamburg, Germany.
  15. Feng, X., Zhou, J., Li, X. and Hu, J. (2008), "Structural condition for free spanning submarine pipelines", Proceedings of the 18th International Offshore and Polar Engineering Conference, Vancouver, BC, Canada.
  16. Job, P. and Hawkins, M. (2008), "In-situ vibration monitoring of pipeline freespans", Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril, Portugal.

피인용 문헌

  1. BP neural network recognition algorithm for scour monitoring of subsea pipelines based on active thermometry vol.125, pp.18, 2014, https://doi.org/10.1016/j.ijleo.2014.06.018
  2. A three-index estimator based on active thermometry and a novel monitoring system of scour under submarine pipelines vol.183, 2012, https://doi.org/10.1016/j.sna.2012.05.039
  3. Three dimensional finite element analysis of 4 inch smart flange on offshore pipeline vol.4, pp.4, 2014, https://doi.org/10.12989/ose.2014.4.4.279
  4. Scour monitoring system of subsea pipeline using distributed Brillouin optical sensors based on active thermometry vol.44, pp.7, 2012, https://doi.org/10.1016/j.optlastec.2012.03.015