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Complimentary Live Webinar
Wednesday 30 November 2016
9AM EDT / 1PM GMT / 2PM CET
The increasing size and quantities of wind turbines installed offshore means that a change in requirements is needed for shipping project cargo between manufacturing and marshalling port facilities and feeding Wind Turbine Installation Vessels (WTIVs) offshore. Feeder vessels allow WTIVs to focus on installation and stops them being expensive inefficient cargo vessels.
But feeding has historically introduced a lifted, offshore vessel-to-vessel transfer of components. With floating feeder vessels this introduces two limitations – wave height and wind speed limits. Jack-up feeder vessels avoid the wave limits, but it means there must be two weather windows for blade lifts.
We believe that the solution lies in adopting the Fast Feeder Vessel (FFV) strategy using a “Roll-on, Roll-off” method of vessel transfer and will avoid both wave-limits and the tight wind speed limits associated with lifting blades offshore.
A further enhancement is the DNV GL "Twisties” Turbine Cassette (TTC). Modular twist-lock, stackable blade racks are now commonplace on the decks of installation vessels. We have taken this concept and proposed a method for unitisation, by using modular transportation and sea fastening frames, based upon standard 20’ container twist-lock centres. The concept is called the DNV GL “Twisties” - a modular project cargo transport frame system.
Together with industry stakeholders, we aim to establish a Joint Industry Project (JIP) to develop a Recommended Practice for the unitisation of project cargo. Some cargos are suitable for containerisation, but offshore turbine components are too large for this. We have seen attempts made at unitisation, such as the wind industry grouping sets of three blades into a “unit”.
This 45 minute webinar will demonstrate the “Twisties” concept and, expand and answer some of the following questions:
- What is the current mindset of offshore wind turbine transportation and installation?
- What are “Twisties” and how will they benefit the industry, in particular developers, owners/operators, and manufacturers?
- Next steps to Join Industry Project realisation?