OCIMF_Mooring_Equipment_Guidelines_(Second_Edition)

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FIGURE A4: POSITIONING OF FORWARD FAIRLEADS, BOW CHAIN STOPPERS AND

PEDESTAL RO_LLER LEADS

(SHIP OF MORE THAN 150.000 TONNE' DEADWEIGHT FITTED WITH TWO BOW STOPPER.S)

A.3 BOW FAIRLEADS

In practice, il has been found t hat the use of a single central fairlead often creates problems when
aICempling to heave the second chafe chain inboard, as the first chain tends 10 obstrucl Ihe direcl
line of pull. A cerlain amount of interaction between mooring hawsers, Ibjmbles and bawser noats
also occurs wben mooring is effected by a single cenlral lead, which frequently results in chafing
and damage to flotation material. As a result, two bow fairleads are recommended for ships of
over 150,000 tonnes deadweight at maximum summer draft (equivalent to approx. 175,000 tonnes
disp lacement)_

The following recommendations refer to the size, location and type of bow fairleads (See also
Figures A4 and AS):

• The cbock. opening must be large enough 10 pass Ihe mooring/towing componel1ls bUI not
  so large Ihal il allows the components excessive lateral or vertical movement.


• All bow fairleads should measure at least 600 x 450 mm. The 600 x 450 mm chock
  opening of Figure AS will allow passage of two 76 mm (3 in_) diameter chain links side by
  side, provided the chain is diagonally oriented. Chajn normally comes Ihrough the chock
  with the links diagonal to the chock sllrface.