부유식 해양플랜트 계류 체인의 면외굽힘 거동에 대한 연구
A Study on Out-of-Plane Bending Mechanism of Mooring Chains for Floating Offshore Plants
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초록
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.
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.
참고문헌 (7)
- American Petroleum Institute (API), "Recommended Practice 2SK Design and Analysis of Stationkeeping Systems for Floating Structures", ~ (2005)
- Det Norke Veritas (DNV), "DNV-OSE302 Offshore Mooring Chain", ~ (2008)
- Hansen, "Constitution of Binary Alloys" (1958), McGraw-Hill
- 박인규, "2점지지계류를 활용한 심해 부유체의 다점지지계류 개념설계", 대한조선학회 논문집, 45(4), pp.462~467 (2008), 대한조선학회
- P. Jean, "Failure of Chains by Bending on Deepwater Mooring Systems", 2005 Offshore Technology Conference (2005)
- Description of stress-strain curves by three parameters, "Ramberg. W", National Advisory Committee For Aeronautics,, ~, pp.Technical Note No. 902 (1943)
- Roach, Goodzeit, "Scoring Characteristics of 38 Different Elemental Metals in High-Speed Sliding. Contact with Steel", Trans. A.S.L.E, 79, pp.1659~1666 (1956)