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SYS - features
The main performance of the SAL Yoke System relative
to a conventional Tower Yoke system can be summarised
as follow:
Large reduction of overturning moment achieved
by lowering mooring yoke connection from top of
a jacket structure (typically at an elevation
of 45 m above sea bed) to close to seabed (6 m
above sea bed). This gives a much simpler solution
both for the tower and the foundation design.
Significant reduction of structural steel required
for mooring support structure on FPSO, due to
the mooring arm connection for the SYS will be
located at the main deck level with short distance
to vessel main structure. Extensive support structure
above deck level is thus avoided.
Ice forces on the tower structure are largely
reduced. No bracing’s exposed to ice forces. Ice
bending breaker included at still water level.
Risers located within tower column and are therefore
protected against ice and wave forces.
For disconnected system only tower shaft (with
ice breaking device) is exposed to ice forces.
Ice forces on yoke structure and other components
eliminated.
The SYS is designed both for suction anchor
and driven piles. Combination of Suction anchor
with buoyancy tanks make the recovery and re-installation
for re-use of the SYS to a practical possible
solution.
Well-proven sliding bearings are generally applied.
These are designed for unattended service during
design life with no lubrication requirements.
Thus maintenance demanding roller bearings in
the splash zone are avoided.
Possible impact between yoke and FPSO during
Hook-Up eliminated. This gives larger flexibility
for FPSO Hook-Up operation.
SYS References
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