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OPERATIONS & MAINTENANCE SECTION SPONSOR


Monopile preservation at Scroby Sands offshore wind farm


Scroby Sands wind farm is an offshore wind farm located 1.5m off the coast of Great Yarmouth on the Scroby Sands sandbank in the North Sea. The wind farm itself consists of 30 wind turbine generators each rated at 2MW, mounted on monopile foundations.


Scroby Sands, owned and managed by E.ON, has been operational since 2004 and is one of the UK’s first commercial wind farms. Offshore wind turbines are subject to severe problems with corrosion due to the extreme environment they operate in and the longer corrosion is left untreated the greater the problem


MAGNETIC POSITIONING SYSTEM The magnetic positioning system was developed and patented by Abfad to allow their rope access blaster/sprayers to safely and securely hold their position whilst suspended from the ropes. This technique ensures blaster/sprayers can perform the required work to the highest standard and


Walkway gratings and davit arms were removed in stages to enable each phase to be successfully completed before moving onto the next. Once the first phase was completed the gratings and davit arms were reinstated and the remaining half removed in preparation for the second phase to get under way.


SEVERE CORROSION


Once on the monopile structure the extent of the corrosion could be clearly seen and was quite severe in places. Blasting work to SA2.5 standard was carried out to remove all sections of corrosion and the existing coating was profiled and feathered back in preparation for the new protective coating to be applied.


becomes. Regular preservation programs should be operated and managed to allow the turbines to function at their peak level.


REQUIRED EXPERTISE


Having extensive experience in dealing with corrosion and specialist coatings, Abfad Ltd were brought in to refurbish the monopiles steelwork, from grating elevation to sea level, using rope access techniques and their unique magnetic positioning system.


with precision due to being held securely in position by the magnetic clamps and not having to attempt to “tie in” on difficult to access structures, a key factor on this particular project.


WORK DETAIL


The work itself was carried out in two phases to enable the complete refurbishment of the monopile…


• PHASE 1 – consisted of structural steelwork below the walkway gratings being refurbished, as far as the monopile collar section


• PHASE 2 – was to refurbish all steelwork below the collar section to sea elevation


The chosen coating was then applied using an airless spray unit and applied to the nominated thickness.


SUCCESSFUL OUTCOME


The work by Abfad was a success, with all corrosion removed and the new coating applied, ensuring the monopile was left with optimum protection against the elements and looking as good as the day it was constructed.


Abfad Ltd


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www.windenergynetwork.co.uk


EAST OF ENGLAND SPOTLIGHT ON


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