The capacity of a capstan is usually specified by its line pull. This is sized according to the weight of mooring line expected to be hauled in from the vessel to the mooring point. This will be greater for mooring dolphins than berthing dolphins; however, capstans are specified by maximum line pull to provide standardized equipment across the berth.
The correct SWL selection should follow the dynamic mooring analysis done by the consulting company to obtain the value.
Please also note that according to the OCIMF Meg3 guidelines, it is recommended that the SWL of each hook is larger than the MBL of the mooring.
For example, for LNG carriers using 140T MBL ropes, SWL150T quick release hooks are usually designated.
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