Testing of SEWEC's wave energy converter (WEC) which is using Tfi Marines innovative mooring system. This allows the WEC to be secure while not impeding energy extraction.
“For Ocean Energy devices, securing the floating structure, whilst not impeding the energy extraction modes is imperative. The capital cost of present mooring systems is estimated to be over 10% of the capital cost of a typical marine energy converter installation”
Our Mooring & Ocean Energy
Marine energy device moorings need to protect against extreme weather events while allowing dynamic movement during normal operation. They must also deliver a footprint suitable for multi-device deployments. Higher elasticity mooring tethers reduce the loads on a moored device, the reduced load being achieved because the tether elongates through the entire orbital motion of the waves. Elastomeric tethers have the elasticity needed to achieve this, but they cannot deliver the protection in extreme weather without becoming so stiff that they no longer respond under normal loads.
To overcome this problem, a novel mooring tether was developed which combines elastomeric and thermoplastic elements within the one tether. This combined tether delivers low stiffness response in normal load scenarios and high stiffness response in extreme weather scenarios.
TfI Marine is also addressing the design and cost challenge of mooring design through the introduction of its innovative dynamic marine tether. Laboratory results validated with at-sea data demonstrate a load reduction potential of over 70% for our marine tether, which translate to cost reductions. By reducing the mooring loads they enable reductions in the device’s capital and operational costs, reducing the overall cost of energy produced.
Innovative mooring solutions need to allow the structures to be both as secure and as efficient as possible. Our Elastomeric tether greatly enhances survivability with respect to a low-cycle fatigue failure mode for mooring connections. Meanwhile, a compressive thermoplastic bellow made of Hytrel® thermoplastic elastomer provides high-load storm protection with minimal weight (smooth transition over 2-3 orders of load magnitude).
Each project that we are confronted with requires a different solution, be it tidal, wave or floating wind. With our adaptable products, it is possible to build the stress-strain response that your structure requires while guaranteeing substantial load reductions and significant Capex and Opex reductions
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