Abstract
In the mooring operation of a semisubmersible offshore units, mooring anchors and chains are deployed from units by anchor handling boats. In this case, there are two types of deployment method. In one method, all chains are at first dropped onto seabed, then deployed. In the other method, both dropping and deploying operations are performed simultaneously. To make it clear which deployment method is more efficient, it becomes necessary to investigate behaviours of chains and pull-loads of boats under deployment. In this paper a series of analyses on deployment operations are carried out using a newly developed simulation model where equilibrium states of chains are evaluated based on catenary theory and dropping motions of chains can be considered. According to the results optimum deployment method and control pattern for dropping chains are discussed.
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More From: Journal of the Society of Naval Architects of Japan
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