Case Study Overview
R7M support VSMC the principle contractor with an experienced commercial dive team and equipment to be able to perform diving operations in the harsh environment of the North Sea during the late winter months of 2011.
R7M used the optimum equipment for this contract. Nitrox gas was used as the divers breathing medium to maximise diver bottom times, the latest Kirby Morgan 37 hard diving helmets and hot water suits to ensure divers maximum comfort in the cold waters of the North Sea during winter. The dive system was fully compliant with IMCA requirements for offshore oilfield diving operations. The system was approved by Statoil.
At a glance
- Date: 25.01.11 – 31.03.11
- Programme Duration: 66 days
- Project Number: 2269. (12)
- Value: £ xxxxxxxxxx
- Client: VSMC
- Principal Contractor: Red7Marine
Install bellmouth onto subsea J tubes attached to WTG (Wind Turbine Generators) located at the Sherringham shoal wind farm.
Due to the fact that the tidal currents are strong at this location diving operations were performed during slack water periods. Utilising the DSV Volantis and diving with the vessel in DP mode, (Dynamic Positioning mode) up to 3 bellmouths were installed in any 24 hour period.
As an addition, a full Cathodic potential inspection was completed on selected WTG in the field.
Install bellmouths onto the WTG J tubes subsea. This was achieved prior to diving operations. R7M rigging teams were placed on each WTG to install static rigging to suspend the bellmouth off. On the Volantis deck, the R7M dive team installed the rigging to be used in placing the bellmouth onto the sub sea J tube once underwater.
The bellmouth would be overboarded and the (bellmouth) load would be transferred to the static rigging on the WTG. All operations controlled by the R7M Diving Supervisor.
The dive team would be deployed and using the static rigging would position the bellmouth on the WTG subsea J tube.
It was sometimes necessary to pull down the bellmouth using a dead Man Anchor. (DMA).
Lifting operations all compliant with LOLER regulations.
A Cathodic Potential inspection programme was completed on selected WTG’s in the Sheringham Shoal Wind Farm Field.
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