Common Structural Rules - Common Structural Rules for Bulk Carriers and Oil Tankers, January 2019 - Part 1 General Hull Requirements - Chapter 11 Superstructure, Deckhouses and Hull Outfitting - Section 4 Supporting Structure for Deck Equipment and Fittings - 3 Mooring Winches
3 Mooring Winches
3.1 General
3.1.1
Mooring winches are to be efficiently bedded and secured to the deck.
3.1.2 Foundation
The builder and mooring winch manufacturer are to ensured that the foundation is suitable for the safe operation and maintenance of the mooring winch equipment.
3.1.3 Rated pull
The Rated Pull is defined as the maximum load which the mooring winch is designed to exert during operation.
3.1.4 Holding load
The Holding Load is defined as the maximum load which the mooring winch is designed to resist during operation and is to be taken as the design brake holding load or equivalent.
3.1.5 Supporting structure
The supporting structure is to be dimensioned to ensure that for each of the load cases specified in [3.1.7], the stresses do not exceed the permissible values given in [2.1.12]. For mooring winches situated within the forward 0.25 L, the supporting structure is to be dimensioned to ensure that for the load case specified in [2.1.6], the stresses do not exceed the permissible values given in [2.1.13] to [2.1.15].
3.1.6 Corrosion model
These requirements are to be assessed based on net scantlings.
3.1.7
- Mooring winch at maximum pull: 100% of the Rated Pull.
- Mooring winch with brake effective: 100% of the Holding Load.
- Line strength: 125% of the breaking strength of the mooring line provided by the designer (refer to Sec 3, [3.9]).
Rated pull and holding load are defined in [3.1.3] and [3.1.4]. The design load is to be applied through the mooring line according to the arrangement shown on the mooring arrangement plan.
3.1.8
For mooring winches situated within the forward 0.25 L, the resultant forces in the bolts obtained from green sea design loads are to be calculated in accordance with [2.1.6] to [2.1.9].
3.1.9
Where a separate foundation is provided for the mooring winch brake, the distribution of resultant forces is to take into account of the different load path. The brake is only to be considered in relation to the forces in [3.1.7] item (b).
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