ORA'HOLE '': --7"'-;;P;'<---;!2..:...--J./UNIVERSl.L CHOCf{STIFFeNER
("lIGNEO ".'11TH
FAIRl.£J\O SlOES,FIGURE 5.1: TYPICAL CANTILEVERED FOUNDATION IN WAY OF ROUNDED GUNNEL5.4 Pedestal Fairleads
The critical connections are the Toiler pin 10 pedc-ral and pedestal 10 deck attachmcnt. Pedestal
fairleads have failed more often in these areas than any other mooring filling. An example of a good
pin-to-pedestal connection and pedestal-to-deck connection is shown in Figs. 5.5 and 5.6.
Most existing pedestals are of cylindrica.l or conical shape, which makes a proper line-up with re-
inforcemenL. below the deck difficlllt. For tb.is reason, a rectangular section witb rounded edges (see
Figs. 5.5 and 5.6) may be more appropriate in some cases.
5.5 Bollards
BoUards require deck strengthening members in line with all four sides of the bollard base. The
members below deck should be of the same thickness as the base, and [heir welding to the deck
should be equal 10 the weld size between bolJard base and deck. Where bollards line up with existing
StrUclure, such as deck beams, girders. or transverse webs, the welding of tbese members lO !he
deck may have 10 be increased.
5.6 SPM AND EMERGENCY TOWING FITTINGS
Due to the high loading on these fittings, the method of connection to the hull slJUCIurc should be
well thought Olll. Each chain stopper or Smit bracket should be welded directly to the deck of the
vessel or welded or bolted to a plate or pedeslal structure which is in turn weJded to the deck of
the vessel. The stopper or bracket shOUld DOt be boiled directly to the deck of llle vessel. A heavy
deck insert plate may be required. In place of one centreline girder, two parallel girders with spacing
equal to the distance between the cheek plales of the chain stopper or SPM bracket are recommended.
Additional transverse members and pi.flaTs may be required to absorb the load. The SPM or towing
fining should be located as close to the deck as possible. However, a small foundation will normally
be required lO achieve proper alignment between the fiuing, the bow chock and the pedestal fa 'irlead.
The foundation must be providt-d with a tbmst block capable of absorbing the chain load specified
in Section 4.