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http://dx.doi.org/10.3744/SNAK.2010.47.4.580

A Study on Out-of-Plane Bending Mechanism of Mooring Chains for Floating Offshore Plants  

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)
Publication Information
Journal of the Society of Naval Architects of Korea / v.47, no.4, 2010 , pp. 580-588 More about this Journal
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
OPB(Out of plane bending); IPT (In-plane tension); Friction coefficient; Proof load; Nominal tension; Chain grade; Chain diameter; Stud chain; Studless chain;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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