News | EQUIPMENT
Construction
BP Valhall deck
reaches milestone
The construction of the Valhall Re-Development Integrated Production & Hotel Facility deck for BP Norge reached a milestone at the end of January. Te 11,000tonne topsides leſt the extensive fabrication hall at Heerema Zwijndrecht in the Netherlands for further completion outside aſter the maximum fabrication height of the deck had been reached. Although Heerema Zwijndrecht’s facility has a
capacity which ranks amongst the largest indoor facilities in Europe, limited space meant that the next stage of construction had to be moved outside for completion. Heerema Zwijndrecht is one of the three production locations of Heerema Fabrication Group (HFG). Heerema Zwijndrecht was awarded the fabrication
and integration contract of the 11,000tonne Integrated Production & Hotel Facility topsides in March 2007, together with the 350tonne flare boom structure, fabrication of which started in November 2007. Additionally, on 23 June 2009 Heerema Zwijndrecht received the award for the fabrication of the 2000ton weather deck module. Te BP Valhall main deck will measure 100m in length,
47m in width and 50m in height. It is expected that all the structures: main deck, weather deck module, flare boom, as well as bridges 1 and 2, will leave the Heerema Zwijndrecht location in May/June 2010 for their final destination offshore Norway. Once completed, the topsides will weigh more than 13,000tonnes, excluding the power-from-shore module and living quarters. Chris Ruthven, project manager BP, said: “Te site
move represents a significant progress milestone for the BP-operated Valhall Re-development project for which
everyone involved can feel justifiably proud. I would like to thank the Heerema organisation, and all their sub-contractors, for the tremendous efforts made in reaching this important point. Te team can now focus all its energies on having the main deck, and other important Heerema-based elements of the project, fully complete and commissioned prior to sail away.” Heerema Fabrication Group (HFG) is headquartered
in Zwijndrecht, the Netherlands. HFG offers innovative, cost-effective and high-quality engineering and fabrication solutions for offshore structures to the global oil & gas and energy industry.
Corrosion protection
Cathelco ICCP for
new jack-up
Cathelco are supplying an impressed current cathodic protection (ICCP) hull corrosion protection system for a new type of jack-up vessel, which is being constructed for Master Marine of Norway. Te vessel, known as Service Jack 2, will initially be used
to install wind turbines in the Sheringham Shoal Offshore Wind Farm, which is located in the Greater Wash approximately 14.5km north of the town of Sheringham in Norfolk, United Kingdom. Master Marine, who specialise in the transport and
installation of heavy structures for the offshore energy industry, won the contract for planning and installing 88 turbines and two substations from Scira Offshore Energy Ltd and its partners Statoil and Statkraſt of Norway. With a length of 117m and a width of 50m, the vessel
has a hull configuration resembling a barge, but differs significantly in having four retractable legs that enable the laden hull to be elevated. Te key to effective corrosion protection of hulls is
to ‘polarise’ the whole area by ensuring an even current distribution. Tis is achieved by placing the anodes and reference electrodes in the most appropriate positions. It was decided that the retractable legs would be best protected against corrosion by using sacrificial anodes, whereas the hull would be most effectively protected using an ICCP system. “Te retractable legs are located within ‘moonpools’
which could affect the performance of the ICCP system by creating a ‘current drain’ and lowering the level of protection. To eliminate this possibility we took particular care in positioning the reference electrodes so that the system is effectively monitored and optimum output is delivered by the anodes to prevent corrosion,” said Aneel Mumtaz, a corrosion engineer at Cathelco.
Site move BP Valhall at Heerema Zwijndrecht (Credit: Heerema Fabrication Group).
12 Offshore Marine Technology 2nd Quarter 2010
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