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Static and dynamic mooring analysis - Stability of floating production storage and offloading (FPSO) risers for extreme environmental conditions

  • Rho, Yu-Ho (Graduate School, Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Kim, Kookhyun (Department of Naval Architecture, Tongmyong University) ;
  • Jo, Chul-Hee (Division of Aerospace, Naval Architecture and Industrial Engineering, Inha University) ;
  • Kim, Do-Youb (Graduate School, Department of Naval Architecture and Ocean Engineering, Inha University)
  • Published : 2013.06.30

Abstract

Floating production storage and offloading (FPSO) facilities are used at most of the offshore oil fields worldwide. FPSO usage is expected to grow as oil fields move to deeper water, thus requiring the reliability and stability of mooring wires and risers in extreme environmental conditions. Except for the case of predictable attack angles of external loadings, FPSO facilities with turret single point mooring (SPM) systems are in general use. There are two types of turret systems: permanent systems and disconnectable turret mooring systems. Extreme environment criteria for permanent moorings are usually based on a 100-year return period event. It is common to use two or three environments including the 100-year wave with associated wind and current, and the 100-year wind with associated waves and current. When fitted with a disconnectable turret mooring system, FPSOs can be used in areas where it is desirable to remove the production unit from the field temporarily to prevent exposure to extreme events such as cyclones or large icebergs. Static and dynamic mooring analyses were performed to evaluate the stability of a spider buoy after disconnection from a turret during cyclone environmental conditions.

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References

  1. ABS, 1993. Recommended practice for design, analysis and maintenance of mooring for floating production systems. Washington D.C.
  2. API, 1998. Design of risers for floating production systems (FPSs) and tension-leg platforms (TLPs). Washington D.C.: API Publishing.
  3. DNVs, 2001. Dynamic riser. Det Norske Veritas.
  4. DNVs, 2008. DeepC user''s manual. DNVs software.
  5. Duggal, A., Ryu, S. and Andrade, O.D., 2007. Numerical modeling of disconnectable turret mooring systems. SOFEC Inc.
  6. Journee, J.M.J., 2001. Offshore hydromechanics. Delft University of Technology.
  7. Jung, G.S., 2002. Analysis of mooring behavior of a berthed ship. Master''s Thesis. Inha University.
  8. Na, J.H., Sim, W.S., Lee, I.H., Moon, J.S., Kim, J.W. and Shin, H.S., 2004. FPSO quay mooring analysis in typhoon condition. Proceedings of the Annual Autumn Meeting, The Society of Naval Architects of Korea. Sancheong, Korea 20-22 October 2004. pp.646-651.
  9. Yang, C.K., Bae, Y.H., Kim, M.H. and Ward, E.G., 2010. Loads on tie-down systems for floating drilling rigs during hurricane conditions. International offshore and polar engineering conference. 20(2), pp.95-102.