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TRIAXYS™ Mooring
Requirements
The TRIAXYS™ Directional
Wave Buoy has special mooring requirements that need to be
observed in order to achieve maximum performance. The key feature required
is the need to de-couple the mooring from the buoy to allow unrestricted
buoy motions in wave fields. The de-coupling is accomplished
either by operating the TRIAXYS™ buoy in an untethered
free-floating configuration, or by use of a compliant mooring
section. The compliant mooring section is composed of a special
extruded 32 mm (1.25”) rubber cord, 15 m in length, terminated
with stainless steel compression fittings. The elastic nature
of the compliant component allows the TRIAXYS™ buoy to
follow waves in an unrestricted fashion. The compliant section
is usually attached directly to the buoy. Please see below for
links to sample mooring diagrams.
The mooring connection to the buoy should be made with a 12 mm stainless
steel swivel. The swivel reduces the chance that the mooring will become
fouled in the presence of rotary tidal currents. There are no requirements
for external ballast as the buoy’s internal batteries provide
the proper dynamic stability for the buoy’s operation.
The balance of a TRIAXYS™ mooring requires the following:
For depths of up to 75m, a simple means to calculate the component
lengths are as follows:
Mooring Depth (m) x 2 = total mooring length (TML)
TML – compliant mooring segment (15 m) = residual mooring
length (RML)
RML / 2 = length of each polypropylene line and Spacelay™ components
(Note: Spacelay™ is an anti-torque nylon coated wire.)
The polypropylene line is lifted off the bottom to prevent any accelerated
wear by using auxiliary floatation on the lower segment of the mooring.
By virtue of the neutrally buoyant compliant section and the positively
buoyant polypropylene line, the design of this mooring will not add
any residual weight to the buoy. The only vertical weight component
added to the buoy is from current drag on the buoy and mooring.
Another consideration that must be taken into account is that mooring
components must be selected to ensure they are electrolytically and
mechanically compatible. Isolation of dissimilar metals is imperative
to prevent galvanic corrosion that will cause premature mooring failure.
This can be accomplished by using “like materials” (e.g.,
SS 316 with SS 316) or isolation bushings (e.g., nylon thimbles) to
prevent contact of dissimilar materials. For long-term deployments
the use of anodes on metal components is recommended. Shackle sizes
should be chosen so that safe working loads are not exceeded during
deployment and recovery operations, as well as for wear factors during
deployment.
Please click on the links below for sample mooring diagrams:
 20-30m
TRIAXYS™ Mooring (PDF, 249 Kb)
50-100m
TRIAXYS™ Mooring (PDF, 306 Kb)
100-150m
TRIAXYS™ Mooring (PDF, 277 Kb)
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