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Effects of geometric shape of LWSCR (lazy-wave steel catenary riser) on its global performance and structural behavior

  • Kim, Seungjun (Department of Construction Safety and Disaster Prevention Engineering, Daejeon University) ;
  • Kim, Moo-Hyun (Department of Ocean Engineering, Texas A&M University)
  • 투고 : 2018.07.09
  • 심사 : 2018.08.22
  • 발행 : 2018.09.25

초록

This study aims to investigate the behavioral characteristics of the LWSCR (lazy-wave steel catenary riser) for a turret-moored FPSO (Floating Production Storage Offloading) by using fully-coupled hull-mooring-riser dynamic simulation program in time domain. In particular, the effects of initial geometric profile on the global performance and structural behavior are investigated in depth to have an insight for optimal design. In this regard, a systematic parametric study with varying the initial curvature of sag and arch bend and initial position of touch down point (TDP) is conducted for 100-yr wind-wave-current (WWC) hurricane condition. The FPSO motions, riser dynamics, constituent structural stress results, accumulated fatigue damage of the LWSCR are presented and analyzed to draw a general trend of the relationship between the LWSCR geometric parameters and the resulting dynamic/structural performance. According to this study, the initial curvature of the sag and arch bend plays an important role in absorbing transferred platform motions, while the position of TDP mainly affects the change of static-stress level.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

참고문헌

  1. API 2INT-MET (2007), Interim guidance on hurricane conditions in the Gulf of Mexico, American Petroleum Institute; Washington, D. C., U.S.A
  2. API RP 2RD (2009), Design of risers for floating production systems (FPSs) and tension-leg platforms (TLPs), American Petroleum Institute; Washington, D. C., U.S.A
  3. Garrett, D.L. (1982), "Dynamic analysis of slender rods", J. Energ. Resour. Technol., 104(4), 302-307. https://doi.org/10.1115/1.3230419
  4. Jacob, B.P., Reyes, M.C.T., Lima, B.S.L.P., Torres, A.L.F.L., Mourelle, M.M. and Silva, R.M.C. (1999), "Alternative configurations for steel catenary risers for turret moored FPSO's", Proceedings of the 9th International Offshore and Polar Engineering Conference, Brest, May.
  5. Kang, H.Y. and Kim, M.H. (2012), "Hydrodynamic interactions and coupled dynamics between a container ship and multiple mobile harbors", Ocean Syst. Eng., 2(3), 217-228. https://doi.org/10.12989/ose.2012.2.3.217
  6. Kim, M.H., Koo, B.J., Mercier, R.M. and Ward, E.G. (2005), "Vessel/mooring/riser coupled dynamic analysis of a turret-moored FPSO compared with OTRC experiment", Ocean Eng., 32, 1780-1802 https://doi.org/10.1016/j.oceaneng.2004.12.013
  7. Kim, S., Kim, M.H., Shim, S. and Im, S. (2014), "Structural performance of deepwater lazy-wave steel catenary risers for FPSOs", Proceedings of the 24th International Offshore and Polar Engineering Conference, Busan, May.
  8. Kim, S. and Kim, M.H. (2015), "Dynamic behaviors of conventional SCR and Lazy-Wave SCR for FPSOs in deepwater", Ocean Eng., 106, 396-414. https://doi.org/10.1016/j.oceaneng.2015.06.039
  9. Kuiper, G.L., Brugmans, J. and Metrikine, A.V. (2008), "Destabilization of deep-water risers by a heaving platform", J Sound Vib., 310, 541-557. https://doi.org/10.1016/j.jsv.2007.05.020
  10. Li, S. and Nquyen, C. (2010), "Dynamic response of deepwater lazy-wave catenary riser", Deep Offshore Technology International, Amsterdam, December.
  11. Ran, Z. (2000), "Coupled dynamic analysis of floating structures in waves and currents", Ph.D. Dissertation, Texas A&M University, College Station, TX, USA.
  12. Ran, Z. and Kim, M.H. (1997), "Nonlinear coupled responses of a tethered spar platform in waves", Int. J. Offshore Polar., 7(2), 111-118.
  13. Silva, R.M.C., Moraes, M.G.G., Cristisinelis, A.F. and Torres, A.L.F.L.T (1999), "The feasibility study and preliminary design of a steel riser attached to a FPSO", Proceedings of the 18th International Conference on Offshore Mechanics and Arctic Engineering, St. John's Newfoundland, July.
  14. Tahar, A. and Kim, M.H. (2003), "Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO", Appl. Ocean Res., 25, 367-382. https://doi.org/10.1016/j.apor.2003.02.001
  15. Torres, A.L.F.L., Mourelle, M.M. and Silva, R.M.C. (2001), "Fatigue damage verification of steel catenary risers", Proceedings of the 20th International Conference on Offshore Mechanics and Arctic Engineering, Rio de Janeiro, June.
  16. Torres, A.L.F.L., Casaprima, E.G., Queija, M.S., Dantas, C.M.S., Mourelle, M.M. and Silva, R.M.C. (2002), "Lazy-wave steel rigid risers for turret-moored FPSO", Proceedings of the 21th International Conference on Offshore Mechanics and Arctic Engineering, Oslo, June.
  17. Torres, A.L.F.L., Gonzalez, E.C., Ferreira, M.D.S., Siqueira, M.Q., Mourelle, M.M. and Silva, R.M.C. (2003), "Lazy-wave steel rigid risers for FSO with spread mooring anchoring system", Proceedings of the 22th International Conference on Offshore Mechanics and Arctic Engineering, Cancun, June.
  18. Yang, C.K. and Kim, M.H. (2010), "Linear and nonlinear approach of hydropneumatic tensioner modeling for spar global performance", J. Offshore Mech. Arct., 132(1), 011601. https://doi.org/10.1115/1.3160468
  19. Yang, C.K. and Kim, M.H. (2011), "The structural safety assessment of a tie-down system on a tension leg platform during hurricane events", Ocean Syst. Eng., 1(4), 263-283. https://doi.org/10.12989/ose.2011.1.4.263
  20. Yang, H. and Li, H. (2011), "Sensitivity analysis of fatigue life prediction for deepwater steel lazy wave catenary risers", Sci. China Technol. Sc., 54(7), 1881-1887. https://doi.org/10.1007/s11431-011-4424-y
  21. Yue, B., Campbell, M., Walters, D., Thompson, H. and Raghavan, K. (2010), "Improved SCR design for dynamic vessel application", Proceedings of the 29th International Conference on Ocean, Offshore and Arctic Engineering, Shanghai, June.
  22. Yue, B., Walters, D., Yu, W., Raghavan, K. and Thompson, H. (2011), "Lazy wave SCR on turret moored FPSO", Proceedings of the 21th International Offshore and Polar Engineering Conference, Maui, June.
  23. Wu, M. and Huang, K. (2007), "The comparison of various SCR configurations for bow turret moored FPSO in West Africa", Proceedings of the 16th International Offshore and Polar Engineering Conference, San Francisco, May.