OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

Same Size &

Type Mooring

E

g E

g

line _____

""'--

lOOT (981 kN)

A) Effect Of Mooring Line Material

150 T (1 471 kNl

B) Effect Of Mooring Line Length

Steel = 4 7T (461 kN)

POlypropyJene ~ 2T (2o kN)

Nylon ~ r T (10 kN)

NOT ACCEPT ABLE

< 25 T ( 245 kNl

SOT 1490 kN)

NOT ACCEPT ABLE

15oT(1 47 kN)

r----300mm Nylon", SOT (461 kN)

14--+-----200mm Nylon = 25 T (245 ~Nj

ACCEPTABLE

C) Effect Of Mooring Line Size

Note: All Loads Are Approximations

FIGURE 1.6: EFFECT OF MOORING ELASTICITY ON RESTRAINT CAPACITY

The effects of mixing wire and synlhelic fibre lines are shown in Fig. 1.4, by comparison of Cases
and 2. (Note [he low loads in fibre lines 2, 4, 11 and 13 and the increase in wire loads from a
ma_ximum of 57 tonnes (559 kN) to a maximum of 88 tonnes (863 kN).

The effect of line length on load distribution musl also be considered. Line elasticity varies directly
with line length and has a significant effect on line load. A .... ire line 60 m long will assume only
about half the load of a 30 m parallel and adjacem line of the same size, construction aDd material.