Page 196 - Introduction to Marine Engineering

S82 Deck machinery and hull equipment

Mooring equipment

Winches with various arrangements of barrels are the usual mooring
equipment used on board ships. A mooring winch is shown in Figure 10,1
where the various parts can be identified. The winch barrel or drum is
used for hauling in or letting out the wires or ropes which will fasten the
ship to the shore. The warp end is used when moving the ship using
ropes or wires fastened to bollards ashore and wrapped around the warp
end of the winch.
The construction of a mooring winch will now be examined, again
with respect to Figure 10.1. The motor drive is passed through a spur

Driving
motor
Figure 10.1 Mooring winch

gear transmission, a clutch and thus to the drum and warp end. A
substantial frame supports the assembly and a band brake is used to hold
the drum when required. The control arrangements for the drive motor
permit forward or reverse rotation together with a selection of speeds
during operation.
Modern mooring winches are arranged as automatic self-tensioning
units. The flow of the tides or changes in draught due to cargo
operations may result in tensioning or slackening of mooring wires. To
avoid constant attention to the mooring wires the automatic self-
tensioning arrangement provides for paying out (releasing) or recover-
ing wire when a pre-set tension is not present.

Anchor handling equipment

The windlass is the usual anchor handling device where one machine
may be used to handle both anchors. A more recent development,