OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

AFT BACKSPRINGS

ENGINE CASING ACCOMMODATION BLOCK

FIGURE 3.7: SPECIAL ARRANGEMENT FOR AFT BACKSPRINGS

overhead rollers on t.he starboard side to the shipside fairlead. Figure 3.4 shows the wincbes arrange.d
on both port and starboard sides. This placement is less common since it would take twO operators
to control a pair of winches (unless shipside remOle cOlllrols are provided port and starboard), as
well as requiring more hydraulic or steam piping. Ships with elevated deck pipi.ng should lead the
wire under t.he pip es 10 simplify bringing OUI o f lines. In this case, low horizontal rollers would be
used to prevent line cha fing on the deck.

AllenlioD must be paid 10 the method of bringing the mooring line from tbe drum to the sh ip side
fa irlead prior to docking. For lines runoing over the deck pipes, a cross-over walkway should be
arranged directly next to th e winches. In addition, some owners provide powered capstans for large
ships. These allow the line to be drawn out with a heaving line led from th e eye of the mooring line
to the associated shipside faidead. and from there back. through an adjaceot fairlead ooro a capstan.
Such. an arrangement is shown in Fig. 3.1 (hem 19).

3.2.4 Special A rra1lgemenlS for Gas Carriers

For nush deck LNG and LPG carriers (membrane type, etc.) the arrangement for spring lines and
associated winches may be similar to those adopted for oil tankers. For spherical tank LNG carriers
and lobe/cylindrical tank LPG carriers it is usually not praclicable 10 incorporale main deck winches