The recent arrival of the Subhub’s appendages brings the build phase of this fully integrated tidal platform to a conclusion. QED will soon validate claims that Subhub provides a “tidal array in a day” along with easy and quick recovery for maintenance at the surface or in sheltered water.
The Subhub is a universal foundation platform and deployment / recovery method suitable for any type of turbine. It can be modified to capture the benefits of both Horizontal Axis Turbines (HATs) and/or Vertical Axis Turbines (VATs). The platform’s ballasting methods can work equally well with wave turbines as well.
The principle benefit of the Subhub is its ability to install a fully integrated, gravity based structure to the seabed including turbines, PTO equipment, ballast. It does this in a single and quick offshore operation using small support vessels which are commonly available making it a very cost effective solution.
However, Subhub also provides large performance advantages by steering the turbulent flows into the turbines enabling them to perform as expected in rated flow conditions significantly increasing site capacity factors and energy yield.
Subhub with all her appendages including Cross Beam to support the tidal turbines and the Subsea Manifold in the background to control the Subhub remotely from small support vessel or barge.
On Saturday 13th January 2018, Subhub was successfully moved out of the fabrication shed where Cimpina built the main hull. Their support throughout build and integration stages has been nothing short of exemplary.
The move was completed by Mar Train Heavy Lift Limited who managed the job with the utmost professionalism. The move involved removing part of the front of the fabrication shed, a process that Cimpina have managed themselves and with the help of local contractors.
QED Naval have completed the initial outfit and furnishing of all the internal ballast systems made up of UK based supply chain companies for all the hydraulic, pneumatic, electrical and control systems. The project has employed over 200 people and contractors which demonstrates the wealth that can be injected into the UK economy if tidal energy was better supported by the UK government.
The lay down area within the Titanic Quarter is ideal for completing the final stages of commissioning including the fitting of the X-beam that supports three tidal turbines. This variant of the Subhub has been designed for Schottel SIT 250 turbines each rated at 70kW. Broadly speaking, this equates to generating sufficient power to support around 60 homes.
Full systems testing can be carried out from this location which is an ideal location to base QED Naval’s operations. It allows QED to build confidence and train staff in the installation and recovery procedures.
Customers are invited to see the Subhub for themselves. Please contact Jeremy Smith on +44 (0) 131 557 8049 if you wish to arrange a visit.
Marine renewable engineering and design consultants