ANCHORING & MOORINGS
LEADING THE WAY IN DYNAMIC MOORING TETHERS
Irish SME, TfI Marine, is supplying its mooring spring components as part of a project to drive down the cost of ScotRenewables’ tidal energy platform.
Mooring systems for floating tidal platforms are stretched taut by the turbine thrust load with no give to absorb wave loadings above this. Now TFI Marine components can be added to the mooring to absorb these wave loads. These components, capable of managing loads up to 300 tonnes will be deployed on the moorings of the new Scotrenewables’ 65m long floating tidal turbine, at EMEC in 2017. Wave and floating tidal energy devices need to be kept in position to both produce power and to ensure their survivability. The moorings also need to minimise the impact of wind, current and wave loads on the structure, along with being able to facilitate the dynamic movement (or lack of) required for optimal energy production. These are very difficult challenges for traditional moorings.
For rigid station keeping they deliver very stiff response in operating conditions with low stiffness response in survival conditions; with no change in motion in operating conditions but freedom of motion in extreme conditions to ensure survivability.
CUSTOMISABLE
Developed with these requirements in mind, the company is offering developers polymer tethers; combinations of elastomers and thermoplastic springs; each customised for wave, floating tidal and floating wind devices and the associated environmental conditions. For wave energy devices that require station keeping while moving freely in the waves, TFI can offer a tether with low stiffness response in normal load conditions and high stiffness response in extreme weather conditions; reducing peak loads by up to 70% and eliminating shock loads.
For floating tidal devices, they deliver a very stiff response up to the thrust loads and low stiffness response above that.
SCALABLE
They are fully scalable up to multi-MN loads and offer developers the potential to operate in conditions and locations previously unachievable, enabling increased power production along with substantial capital and operational cost reductions.
TFI Marine
Hydrography & Marine Support
• Surface & Subsea Positioning • Construction Support
• Hydrographic Survey • ROV Inspection
T 44 (0)1208 77033 •
www.insight-marine.com www.wavetidalenergynetwork.co.uk PAGE 15
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