1. MYKLASSHIP.COMTM
MALAYSIA GLOBAL LEADERSHIP CLASSIFICATION SOCIETY
MYKlasshipGUIDESTM
Title OPERATIONAL RELIABILITY AND READINESS OF ANCHORING
AND MOORING EQUIPMENT
Issue No 2012/02
Date of Issue 28th November 2012
Issued by EngSyr. YUZRI Khairulmuzammil
Verified by Ir. UMAR Chalis
Continuos reliability and readiness of anchor chain and anchor windlass/winches in vessel operation can be practically
guided by:
· Chain strenght
· Anchoring Performance
· Windlass/Winch Brake Band
Chain Strength
The strength of anchor chain can be interpreted by measuring individual chain links as below:
dm ³ 0.88 x do (i.e. should not be reduced by 12%)
dm = mean measured diameter.=( d1+ d2)/2
do = original diameter corresponding to vessel’s design equipment letter.
1. Chain cable length is to be renewed if one or more links measured below acceptable
minimum.
2. Certificate shall be presented and checked against stamping.
3. Link diameter of new chain is recommended equal to or above 95% of the value
corresponding to the equipment letter
4. If a higher/lower grade is used, the diameter may be reduced/ is required increased
correspondingly. However,it must be verified that the chain links fit in the cable lifter
without slipping
Anchoring Performance
Lowering Test
An anchoring test is to be carried out to demonstrate that the windlass brakes etc. functions satisfactorily by applying brake
during lowering.
Hoisting Test
The mean speed on the chain cable when hoisting the anchor and cable is not to be less than 9 m/min. and is to be measured
over two shots (55 m) of chain cable. Test should be commenced with 3 shots (82.5 m) of chain cable fully submerged. Where
the depth of water is inadequate, consideration will be given to acceptance of equivalent simulated conditions.
Winch Brake Band Test
Each winch brake shall be tested to prove that they render at a load that is equivalent to 60% of the line’s MBL:
END OF GUIDES
· If slippage occurs at pressure less than
designed, the brake should be
tightened and repaired and jack
pressure re-applied’
· If the recorded pressure is correspond
to the design pressure, the jack should
be released and the test gear removed
· If slippage does not occur at the
design pressure, the brake setting
should be adjusted so the brake can
be render at the design load
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