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In this paper, we investigated the design method of mooring system in ultra deep sea and carried out the conceptual design for offshore West Africa oil field in ultra deep sea of 3000 meters. Recently, it was feasible to design and install th e offshore floating structures in deep sea of up to 2000 meters. Due to the simplicity, two-point mooring design is fully utilized. Force-excursion curves are throughly examined to find out the feasibility of various combinations of mooring lines. Free length and pretension effec ts are discussed. It is found that composite materials including synthetic fiber rope may be good solution for ultra deep sea mooring design. ※Keywords: Ultra deep sea mooing(), Mooring design( ), Free length(), Pretension(), Synthetic fiber rope(), Composite material(), Two-point mooring(), Force-excursion curve(-), Multi-point mooring() 1.         1000m       .

Conceptual Design of Deep-sea Multi-Point Mooring by using Two-Point Mooring