NEWS

The term definition for marine mooring winches is based on CCS and ISO 3730 Shipbuilding – Mooring winches

 

1. Working/drum load: Drum load is the maximum rope tension measured at the drum exit when the winch is hoisting or hauling in at the nominal speed with the rope wound on the drum in a single layer.

2. Holding load: Holding load is the maximum static tension that can be maintained by a braking/locking system in the first layer.

3. Stalling load: Stalling load is the maximum rope tension measured at the drum exit when the drum ceases to rotate in the haul direction, with the prime mover being set for the maximum torque and the rope being wound on the drum in a single layer.

4. Recovery load (applicable to automatic mooring winches only) is the maximum rope tension measured at the drum exit when the drum commences to rotate in the haul direction, with the prime mover being set for the maximum torque under automatic control and the rope being wound on the drum in a single layer.

5. Rendering load (applicable to automatic mooring winches only) is the maximum rope

6. tension measured at the drum exit when the drum just commences to rotate in the direction opposite to the applied driving torque, with the prime mover being set for the maximum torque in automatic control and the rope being wound on the drum in a single layer.

7. Nominal speed is the maximum speed that can be maintained by the winch when it is applying the drum load.

8. Line Design Break Force (LDBF) means the minimum force that a new, dry, spliced, mooring line will break at. This is for all synthetic cordage materials.

9. Ship Design Minimum Breaking Load (MBLSD) means the minimum breaking load of new, dry, mooring lines for which shipboard fittings and supporting hull structures are designed in order to meet mooring restraint requirements.

10. Mooring equipment and fittings means items such as mooring winches, capstans, bollards, bitts, fairleads, rollers, chocks, etc. and also includes mooring lines.

11. Mooring lines means ropes, wires and combinations used for mooring operations other than messenger lines but including tails.

12. Working Load Limit (WLL) means the maximum load that a mooring line should be subjected to in operational service, calculated from the relevant environmental mooring restraint requirement.