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Basically, there are 3 main alternatives to keep a semi submersible vessel on station:
In the system determination these three options will be described so that the designer can make a well-considered choice based on the input originating from the first block. A semi sub is always spread moored by its corners. Since it is nearly indifferent of the loading direction there is no need for the vessel to be able to weathervane. The mooring lines are connected at the corners of the vessel. Catenary mooring line shapes are most common, however in deep water the weight of these mooring lines increases to unacceptable values. This brings the need for different solutions. One possibility is the use of a taut mooring line system; another possibility is the use of dynamic positioning. There is little experience in taut mooring systems; however they seem to offer a good and cheaper solution for deep water moorings.
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