Case Study

Offshore Wind Farm, North Sea

Specialist Coatings GB Ltd. Offshore wind farm cold water tank lining inspection and repair service. North Sea 60 miles off the coast of Denmark.

The Client

Semco Maritime for Dong Energy, Esbjerg, Denmark
Offshore Wind Farm, North Sea

Required the inspection and patch repairs being made to the lining of two bulk drinking storage tanks on the Dong Energy Horn 2 offshore wind farm accommodation block, located in the North Sea several miles off the coast of Esbjerg.

Blisters had been forming on some of the tank surfaces. When opened, each and every blister had water trapped behind it. Left uncheck, this would have resulted in a serious corrosion issue which would eventually perforated the tank.


Challenges

The work had to be carried out on site at the offshore wind farm in the North Sea off the coast of Denmark during March.

There would only be a very short window of opportunity to carry out the work because on this particular project the water could not be by-passed the tanks had to be inspected and repaired whilst the block was vacant.

All equipment, materials, personal items had to transported by the supply ship from main land Demark to the Horns 2 wind farm approximately 90 minutes off from Esbjerg, Denmark. The supply ship was weather dependant.

All of the materials used had to be approved for use in potable water applications. The also had to be surface and damp tolerant and to be able to cure at low temperatures.

The Dong Energy Horn offshore wind farm accommodation block SCGB to inspect & repair the water tanks (Photograph of accommodation block courtesy of Semco Maritime).


The Dong Energy Horn wind farm accomadation block SCGB to inspect & repair the water tanks (Photograph of accommodation block curtesy of Semco Maritime). Horn offshore wind farm in North Sea. SCGB inspecting & repairing the water tanks.

 


Solution

Working closely with Semco Maritime and Dong Energy to co-ordinate the shipping, two day sea survival training courses, and to carry out the inspection and repairs required to complete the task efficiently.

Each individual blister was scrapped clear of the loose ling material and then thoroughly cleaned by localised mini abrasive grit blasting, to produce a bright clean metal surface with all traces of rust removed and a strong mechanical key for the new patch repairs.

Once all the patches had been cleaned and all spent abrasive and debris removed from the tank by brush and vacuumed.

A coat of solvent free surface and damp tolerant, anti-corrosion primer was applied to each individual patch.

The potable water top coat resin coats were applied over the next couple of days.

To avoid delays we stayed overnight aboard the platform most days during the works.

SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark.

SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark.


The Results

The affected areas where prepared, treated, and restored. The tanks were returned to the client and filled with water 24 hours after the final application of resin. Whilst the work was being carried out the inspection was under taken to establish the possible cause of the problem (at the request of the client) and a both verbal and written reports were submitted.

Because of client confidentiality we will not be disclosing our findings on the probable cause of the problem in a public document.

Personal travelling out to the offshore wind farm accommodation platform to carry out tank inspections & localised repairs.

SCGB personal to make inspections & localised repairs Horn Wind Farm North Sea, Denmark.

SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark.

SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark. SCGB personal to make tank inspections & localised repairs to offshore accommodation block water tanks at Horn Wind Farm, North Sea, Denmark.

The Pacific Orca is used to help build the wind turbine towers and accommodation blocks in the wind farms in the North Sea.

We frequently saw the Pacific Orca whilst we were working in Esbjerg.

Pacific Orca being used during construction of wind farms. Pacific Orca being used during construction of wind farms.

Pacific Orca being used during construction of wind farms. Pacific Orca being used during construction of wind farms.