Description
When using mooring ropes, especially for tanker vessels or large vessels, there is a general desirability for the additional elasticity provided by mooring tails.
The additional elasticity reduces the loads induced in mooring wires or HMPE lines under dynamic conditions by permitting the ship to respond more favorably to various combinations of wind, wave, and current forces, as well as to ships passing by in close proximity.
Tails also tend to distribute the loadings more evenly in the mooring lines in the same service.
The additional elongation of the mooring line system permitted by the tail reduces the risk associated with poor line tending and the frequency and precision of line tending, particularly in berths where large tidal variations in high loading- unloading rates.
Tails are also valuable at berths requiring short breast or spring leads as they provide the same effect as long all-wire line systems. And lastly, they facilitate the handling of wire lines by boatman and mooring gangs.
There are two configurations of tail ropes commonly used on board.
When ordering, please specify the following :
(A) Material of rope (PP/PE mixed Line, Nylon, Polyester, etc.)
(B) Construction of rope (8-strand/12-strand/double braided etc.)
(C) Diam or Circ of the ropes
(D) Length of the ropes and the desired eye sizes on each end.
(E) Ship Design Minimum Breaking Load (SDBL) and required Tail Design Break Force (TDBF) based on the criteria according to OCIMF Mooring Equipment Guidelines (MEG4). The TDBF of tails should be 125%-130% of ship design MBL, TDBF is tested and defined in the wet condition and accounts for any material strength loss when wet.
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