Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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A Study on Out-of-Plane Bending Mechanism of Mooring Chains for Floating Offshore Plants

부유식 해양플랜트 계류 체인의 면외굽힘 거동에 대한 연구

  • Lim, Yu-Chang (Dept., of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kim, Kyung-Su (Dept., of Naval Architecture & Ocean Engineering, Inha University) ;
  • Choung, Joon-Mo (Dept., of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kang, Chan-Hoe (Dept., of Naval Architecture & Ocean Engineering, Inha University)
  • 임유창 (인하대학교 조선해양공학과) ;
  • 김경수 (인하대학교 조선해양공학과) ;
  • 정준모 (인하대학교 조선해양공학과) ;
  • 강찬회 (인하대학교 조선해양공학과)
  • Received : 2010.04.18
  • Accepted : 2010.05.28
  • Published : 2010.08.20
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Abstract

OPB(out-of-plane bending)-induced failure of mooring chain was firstly addressed by CALM (catenary anchor leg mooring)-type offloading buoy, located approximately one mile away from the bow of the Girassol FPSO which was installed offshore area of Angola in September 2001. This study deals with verifying the load transfer mechanism between the first free chain link and connected two chain links inside the chain hawse. OPB moment to angle variation relationships are proposed by extensive parametric study where the used design variables are static friction coefficients, proof test loads, nominal tension forces, chain link diameters, chain link grades and chain link types. The stress ranges due to OPB moments are obtained using nonlinear FEAs (finite element analyses). Final stress ranges are derived considering ones from IPT (in-plane tension) forces. Also a formula for OPB fatigue assessment is briefly introduced.

Keywords

References

  1. American Petroleum Institute (API), 2005, Recommended Practice 2SK Design and Analysis of Stationkeeping Systems for Floating Structures.
  2. Det Norke Veritas (DNV), 2008, DNV-OSE302 Offshore Mooring Chain.
  3. Hansen, 1958, Constitution of Binary Alloys, McGraw-Hill, New York.
  4. Park, I.K. and Kim, K.M., 2008, "Conceptual Design of Deep-sea Multi-Point Mooring by using Two-Point Mooring," Journal of the Society of Naval Architects of Korea, Vol. 45, No. 4, pp. 462-467. https://doi.org/10.3744/SNAK.2008.45.4.462
  5. P. Jean, K. Goessens and D. L’ Hostis, 2005, "Failure of Chains by Bending on Deepwater Mooring Systems", 2005 Offshore Technology Conference, OTC-17238.
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Cited by

  1. A Novel Procedure for Mooring Chain Fatigue Prediction based on Maximum Principal Stress Considering Out-of-Plane and In-Plane Bending Effects vol.53, pp.3, 2016, https://doi.org/10.3744/SNAK.2016.53.3.237
  2. Study on prediction of stresses by out-of-plane and in-plane bending moments in offshore mooring chain vol.13, pp.sup1, 2018, https://doi.org/10.1080/17445302.2018.1426806