OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

Movement

off Jetty

0.1Sm

A) NO PAETENSIONING

MOVem$nl

011 Jelty

O.11m

o E

<D

WIND.

ETG

' 50T ( 1471 kN)

~~~ r-~-J

o E

M

50 T (490 kN)

/ 47 T 1461 kN)

/ 2ST(275kN)

B) 10 T PRETENSIONING --- - -------

Note; All hawsers are steel

40mm dia. 6 )( 37 IWAG

FIGURE 1.11: EFFECT OF PRETENSIONING

Generally only the forward or aft spri ng lines will be l.cnsiooed by environmental loads. The

leosioned lines should be tended first, but only if necessary to correct longitudinal positioning

of the ship. The opposing spring lines should then be adjus(ed to remove slack only.

• Fender compression should be observed during discharge or during a rising tide. Fender com-

pr ession may be c.aused b~' over-tight breast lines. If there is high fender compression which

is no( ca used by on-shore winds or e u rrenlS, the breaSI 1 i nes must be slackened.

1.9 PRECAUTIONS APPLICABLE IN HIGH MOORING

LOAD CONDITIONS

Overloadjng of mooring lines is evidenced in a number of ways; for exa m ple, by direct measure-
ments of mooring line loads, by direct observation of the moorings by experienced personnel, or by
predic·tions made by those having a knowledge of the effects of wind and current on the ship mooring
system or by wLncb slippage.

The following precautions are likely to apply:

• Harden-up on tbe winch brakes
  Do not release brakes and aUempt to heave iD


• Discontinue cargo operations


• Reduce freeboard by taking-on ballast jf loads are due 10 high wind conditions.


• Disconnect loading arms and gangways.