Heavy maintenance shall in this innovation contest be understood to comprise replacement and/or repair of large components in the Rotor and Nacelle Assembly (RNA) of an offshore wind turbine. Examples of such components are rotor, rotor blade, hub, rotor blade pitch bearing, main bearing, generator, gearbox and transformer. Jack-up vessels are used for this purpose in the offshore wind industry today.
It is expected that it will not be possible to use jack-up vessels for performing heavy maintenance for many of the future floating wind farm developments. The reason for this is water depth limitations. It is also considered that using large floating crane vessels for heavy maintenance on floating wind turbines will neither be practical nor economically viable, due to long mobilisation time, large day rates and very short weather windows.
Statoil is therefore seeking proposals for equipment and procedures to facilitate efficient heavy maintenance operations on wind turbines offshore. The solutions should not depend upon the use of jack-up vessels or large floating crane vessels.
Participants must complete the proposal and submit by April 23rd 2017. The proposals will be evaluated during April 2017, and participants may be contacted by the evaluation committee for clarifications.
At least one, and up to three proposals will be announced as winners in May 2017, and will each be awarded a cash prize of NOK 100000. When receiving the prize, the winners acknowledge an intention to go into discussions with the aim of developing the proposal further, potentially into an industrial solution. Statoil may in dialogue with the winner(s) introduce a third party in the further development if required.
Offshore wind is an important part of Statoil’s plans for building a profitable new energy business. At the Capital Markets Update in London on February 7th this year, and based on potential future corporate portfolio, Statoil made public the ambition to allocate 15-20 % of CAPEX in 2030 to low-carbon solutions, including new energy projects.
Statoil is presently involved in the following offshore wind projects:
A steadily increasing number of offshore wind farms will need maintenance and replacement of heavy equipment.
Offshore wind turbines have either bottom-fixed or floating foundations. The technology to be developed here shall be suitable for floating wind turbines, but is expected to be useful for bottom-fixed turbines as well.
The participants shall provide a solution for equipment and methodology for:
The proposal must comprise:
Components which are typically expected to be subject to repair/replacement during a heavy maintenance operation are rotor, rotor blade, hub, rotor blade pitch bearing, main bearing, generator, gearbox and transformer.
These components are attached to the Wind Turbine Generator (WTG) at a height of 100 – 150 m above the sea surface, depending on the size of the rotor, and have a weight ranging from 5 to 150 tons, with the generator, hub and gearbox being the heaviest.