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A taut mooring system uses pre-tensioned anchor lines which run straight from the semi sub unit to the bottom. These lines make an angle with the horizontal between 30 and 45 degrees. Since the mooring lines do not terminate horizontally on the bottom the used anchors in this system should be able to support vertical loads. This results in the use of suction piles or vertical load anchors. As a consequence of the straight lines to the bottom this system uses a smaller footprint as compared to a catenary mooring system; also the lines are considerably shorter, resulting in lower forces on the semi sub. The restoring forces are generated by the elastic stresses of the line and as a consequence this system has fairly linear load-excursion characteristics. This results in a better controlled offset under mean load than with the catenary. Finally this system generally has better load sharing capacities between adjacent lines. The mooring lines in a taut mooring system consist of synthetic fibre rope. In the chapter on anchor line types can be found that this results in a much lower weight compared to chains and/or steel wires.
Figure 2.1: Polyester taut mooring |
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