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Abstract
Mooring lines are used as station keeping systems for the deep-water floating offshore platforms. Mooring lines have considerable effect on the project overall cost. Therefore, it is necessary to economize their cost by choosing appropriate material and configuration which, in turn give the required responses for the platform by possessing good restoring capability. Hence, a numerical study has been conducted on the restoring behavior of the mooring system for different mooring line materials, line diameters and fairlead slopes. Two mooring systems consisting of mooring lines arranged unsymmetrical were considered. Assuming the drag forces on the mooring lines to be negligible and the change in the line geometry as insignificant, the mooring system has been analyzed using the quasi-static analysis. The numerical model thus developed has been validated using experimental model test data and a parametric study was conducted using the parameters mentioned. It can be concluded that the polyester mooring lines provide better restoring forces compared to the other materials and also the behavior of mooring system can be greatly affected with change in line diameter and fairlead slope.
Highlights
With increase in the demand for offshore production worldwide, the development in mooring technology is increasing
Now-a-days polyester ropes are more commonly used for deepwater mooring lines; the high stretch of the polyester rope is a problem as the longer mooring lines allow greater horizontal offsets which may exceed the limits of the risers
Based on the study conducted in this study on mooring line materials, diameters and fairlead slopes, following conclusions can be drawn on the behavior of mooring systems:
Summary
With increase in the demand for offshore production worldwide, the development in mooring technology is increasing. As the platform water depths increase, there is a need for strong and lightweight mooring ropes. There has been an increasing focus on the need for more cost-effective mooring systems for the floating platforms at greater water depths. Polyethylene ropes are widely considered to be suitable for deep-water mooring lines due to their high strength and modulus (Flory et al., 2007a; Vlasblom et al, 2012). The mooring system designers are still trying to understand the unique stretch and stiffness characteristics of these ropes to incorporate them into the design procedures. These characteristics are time dependent and linear/nonlinear. The synthetic mooring lines have become a very attractive alternative to conventional steel catenary systems (Nielsen and Bindingbo, 2000)
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