Structural Engineering and Mechanics

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Significance of seabed interaction on fatigue assessment of steel catenary risers in the touchdown zone

  • Elosta, Hany (Flexible Systems Design, FORSYS SUBSEA An FMC Technologies and Technip Company) ;
  • Huang, Shan (Department of Naval Architecture and Marine Engineering, University of Strathclyde) ;
  • Incecik, Atilla (Department of Naval Architecture and Marine Engineering, University of Strathclyde)
  • Received : 2014.07.07
  • Accepted : 2016.01.07
  • Published : 2016.02.10
⟨ Previous Next ⟩

Abstract

The challenges involved with fatigue damage assessment of steel catenary riser (SCR) in the touchdown zone (TDZ) are primarily due to the non-linear behaviour of the SCR-seabed interaction, considerable uncertainty in SCR-seabed interaction modelling and geotechnical parameters. The issue of fatigue damage induced by the cyclic movements of the SCR with the seabed has acquired prominence with the touch down point (TDP) interaction in the TDZ. Therefore, the SCR-seabed response is critical for reliable estimation of fatigue life in the TDZ. Various design approaches pertaining to the lateral pipe-soil resistance model are discussed. These techniques have been applied in the finite element model that can be used to analyse the lateral SCR-seabed interaction under hydrodynamic loading. This study investigates the sensitivity of fatigue performance to geotechnical parameters through a parametric study. In this study, global analyses are performed to assess the influence of vertical linear seabed springs, the lateral seabed model and the non-linear seabed model, including trench evolution into seabed, seabed normalised stiffness, re-penetration offset parameter and soil suction resistance ratio, on the fatigue life of SCRs in the TDZ.

Keywords

References

  1. Akpan, U., Koko, T., Rushton, P., Tavassoli, A. and Else, M. (2007), "Probabilistic fatigue reliability of large diameter steel catenary risers (SCR) for ultra-deepwater operations", Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering, California, USA.
  2. Aubeny, C. and Biscontin, G. (2009), "Seafloor-riser interaction model", Int. J. Geomech., 9(3), 133-141. https://doi.org/10.1061/(ASCE)1532-3641(2009)9:3(133)
  3. Aubeny, C., Biscontin, G. and Zhang, J. (2006), "Seafloor interaction with steel catenary risers", Offshore Research Centre, Texas A&M University, College Station, Houston, Final Project Report to Minerals Management Service,Offshore Technology Research Centre Industry Consortium, OTRC Library Number 9/06A173 Texas 1435-01-04-CA-35515, September.
  4. Aubeny, C., Gaudin, C. and Randolph, M. (2008), "Cyclic tests of model pipe in kaolin", Offshore Technology Conference, Houston, Texas, USA.
  5. Aubeny, C., Shi, H. and Murff, J. (2005), "Collapse loads for cylinder embedded in trench in cohesive soil", Int. J. Geomech., 5(4), 320-325. https://doi.org/10.1061/(ASCE)1532-3641(2005)5:4(320)
  6. Brennodden, H., Lieng, J., Sotberg, T. and Verley, R. (1989), "An Energy-based pipe-soil interaction model", Offshore Technology Conference, Houston, Texas, USA.
  7. Bridge, C. and Willis, N. (2002), "Steel catenary risers-results and conclusions from large scale simulations of seabed interactions", International Conference on Deep Offshore Technology, New Orleans, USA.
  8. Bridge, C., Laver, K. and Clukey, E. (2004), "Steel Catenary Riser Touchdown Point Vertical Interaction Models", Offshore Technology Conference, Houston, Texas, October.
  9. Bruton, D., White, D., Cheuk, C., Bolton, M., and Carr, M. (2006), "Pipe/soil interaction behavior during lateral buckling, including large-amplitude cyclic displacement tests by the safebuck JIP", Offshore Technology Conference, Houston, USA.
  10. Burton, D., White, D., Cheuk, C., Bolton, M. and Carr, M. (2006), "Pipe/soil behavior during lateral buckling, including large-amplitude cyclic displacement tests by the safebuck JIP", Offshore Technology Conference, Houstin, Texas, USA, October.
  11. Cao, J. (2010), "Fatigue analysis technique of deepwater steel catenary risers", Proceedings of the 29th International Conference on Ocean, Offshore and Arctic Engineering, Shanghai, China.
  12. Cardoso, C. and Silveira, R. (2010) "Pipe-soil interaction behavior for pipelines under large displacements on clay soils-a model for lateral residual friction factor", Offshore Technology Conference, Houston, Texas, October.
  13. Clukey, E., Young, A., Dobias, J. and Garmon, S. (2008), "Soil response and stiffness laboratory measurements of SCR pipe/soil interaction", Offshore Technology Conference, Houston, USA.
  14. DNV (2005), "Riser fatigue", Recommended Practice DNV-RP-F204, Ed. Det Norske Veritas.
  15. DNV (2010), "Fatigue design of offshore steel structures", Recommended Practice DNV-RP-C203, Ed. Det Norske Veritas.
  16. Dunlap, W.A., Bhojanala, R.P. and Morris, D.V. (1990), "Burial of vertically loaded offshore pipelines in weak sediments", Offshore Technology Conference, Houston, Texas.
  17. Elosta, H., Huang, S. and Incecik, A. (2013), "Dynamic response of steel catenary riser using a seabed interaction under random loads", Ocean Eng., 69, 34-43. https://doi.org/10.1016/j.oceaneng.2013.05.022
  18. Giertsen, E., Verley, R. and Schroder, K. (2004), "CARISIMA: a catenary riser/soil interaction model for global riser analysis", 23rd International Conference on Offshore Mechanics and Arctic Engineering, OMAE2004-51345, Vancouver, British Columbia, Canada.
  19. Grealish, F., Kavanagh, K., Connaire, A. and Batty, P. (2007), "Advanced nonlinear analysis methodologies for SCRs", Offshore Technology Conferecne, Houston, Texas, USA, October.
  20. Hale, J.R., Morris, D.V., Yen, T.S. and Dunlap, W.A. (1992), "Modelling pipeline behaviour on clay soils during storms", Offshore Technology Conference, Houston, Texas, October.
  21. Hodder, M.S. and Byrne, B.W. (2010), "3D experiments investigating the interaction of a model SCR with the seabed", Applied Ocean Research.
  22. Hodder, M.S. and Cassidy, M.J. (2010), "A plasticity model for predicting the vertical and lateral behaviour of pipelines in clay soils", Geotechnique, 60(4), 247-263. https://doi.org/10.1680/geot.8.P.055
  23. Jin, J., Audibert, J.M. and Kan, W.C. (2010), "Practical design process for flowlines with lateral buckling", Proceedings of the ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2010-20478, Shanghai, China.
  24. Karunakaran, D., Meling, T., Kristoffersen, S. and Lund, K. (2005), "Weight-optimized SCRs for deepwater harsh environments", Offshore Technology Conference, Houston, TX, USA.
  25. Langner, C.G. (2003), "Fatigue life improvment of steel catenary risers due to self-trenching at the touchdown point", Offshore Technology Conference, Houston, Texas, USA.
  26. Leira, B.J., Passano, E., Karunakaran, D., Farnes, K.A. and Giertsen, E. (2004), "Analysis guidelines and application of a riser-soil interaction model including trench effects", 23rd International Conference on Offshore Mechanics and Arctic Engineering, OMAE2004-51527, Vancouver, British Columbia, Canada.
  27. Lyons, C. (1973), "Soil resistance to lateral sliding of marine pipelines", Offshore Technology Conference, Texas, USA.
  28. Morris, D.V., Webb, R.E. and Dunlap, W.A. (1988), "Self-burial of laterally loaded offshore pipelines in weak sediments", Offshore Technology Conference, Huston, Texas, October.
  29. Nakhaee, A. and Zhang, J. (2008), "Effects of the interaction with the seafloor on the fatigue life of a SCR", Proceedings of the 18th International Offshore and Polar Engineering Conference, July.
  30. Nakhaee, A. and Zhang, J. (2010), "Trenching effects on dynamic behavior of a steel catenary riser", Ocean Eng., 37, 277-288. https://doi.org/10.1016/j.oceaneng.2009.10.005
  31. Oliphant, J., Maconochie, A., White, D. and Bolton, M. (2009), "Trench interaction forces during lateral SCR movement in deepwater clays", Offshore Technology Conference, Houston, Texas, USA.
  32. Orcina (2010), "OrcaFlex User Manual", Orcina, Vol. version 9.4a, UK.
  33. Palmer, A. (2008), "Touchdown indentation of the seabed", Appl. Ocean Res., 30, 235-238. https://doi.org/10.1016/j.apor.2008.09.004
  34. Pesce, C.P., Aranha, J.A.P. and Martins, C.A. (1998), "The soil rigidity effect in the touchdown boundarylayer of a catenary riser: static problem", Proceedings of the 8th International Offshore and Polar Engineering Conference, Monterial, Canada.
  35. Randolph, M. and Quiggin, P. (2009), "Non-linear hysteretic seabed model for catenary pipeline contact", 28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2009-79259, Honolulu, Hawaii, USA.
  36. Sen, T.K. (2008) "Fatigue in deep water steel catenary risers - a probabilistic approach for assessment of risk", Offshore Technology Conference, Houston, Texas, USA.
  37. Sen, T.K. and Hesar, M. (2007), "Riser soil interaction in soft clay near the touchdown zone", Offshore Technology Conference, Huston, Texas, USA.
  38. Sharma, P. and Aubeny, C. (2011), "Advances in pipe-soil interaction methodology and application for SCR fatigue design", Offshore Technology Conference, Houston, USA.
  39. Thethi, R. and Moros, T. (2001), "Soil interaction effects on simple catenary riser response", Proceeding Conference on Deepwater Pipeline & Riser Technology, Houston, Texas.
  40. Verley, R. and Lund, K.M. (1995), "A soil resistance model for pipelines placed on clay soils", 225-225.
  41. Wagner, D., Murff, J., Brennodden, H. and Sveggen, O. (1987), "Pipe-soil interaction model", Offshore Technology Conference, Houston, Texas, USA.
  42. White, D.J. and Cheuk, C.Y. (2008), "Modelling the soil resistance on seabed pipelines during large cycles of lateral movement", Marine Struct., 21, 59-79. https://doi.org/10.1016/j.marstruc.2007.05.001
  43. Willis, N.R.T. and West, P.T.J. (2001), "Interaction between deepwater catenary risers and a soft seabed: large scale sea trials", Offshore Technology Conference, Houston, Texas, October.
  44. Xia, J., Das, P.K. and Karunakaran, D. (2008), "A parametric design study for a semi/SCR system in northern North Sea", Ocean Eng., 35, 1686-1699. https://doi.org/10.1016/j.oceaneng.2008.09.007

Cited by

  1. Vortex-induced vibrations and control of marine risers: A review vol.152, pp.None, 2018, https://doi.org/10.1016/j.oceaneng.2018.01.086