Following last week's removal of the Ninian Northern platform topside from its offshore location in the UK North Sea, and its arrival to Lerwick, the topside has now been loaded out at Lerwick Harbour's Dales Voe Base.
"The operation to load-in the 14,200 tonne Ninian Northern topside at Lerwick Harbour's Dales Voe Base has been completed successfully," the Lerwick Port Authority said Thursday.
As previously reported, the giant structure arrived from the North Sea field last Friday on Allseas' construction vessel, Pioneering Spirit, following a swift single lift offshore.
In the deep-water voe, the topside was transferred immediately onto Allsea's Iron Lady cargo barge and then moved to the quayside.
"The complex operation to slide the topside 185 meters from Iron Lady to a newly-built heavy-duty concrete pad, was undertaken over two days. The process involved synchronizing the barge to the quayside to remain absolutely level and a push/pull system of hydraulic engines sliding the total transfer weight of 16,200 tonnes, including skid equipment, along purpose-built skid rails," the port authority explained.
The pad has an impermeable surface with a 60 tonne per square meter loading, which matches the quayside capacity. The quay design has an 800 tonne per meter line loading which enabled the transfer of the topside from the barge.
Captain Calum Grains, Lerwick Port Authority Chief Executive, said: "The successful delivery of the topside by Pioneering Spirit and the smooth operation to safely move the deck onto the Base is another demonstration of the port's capacity and capabilities to handle large decommissioning projects.
"Plans in the pipeline, including for an Ultra-Deep-Water Quay at Dales Voe, will significantly expand our potential to support both decommissioning and renewables.”
Lerwick's biggest project yet, dismantling the Ninian Northern topside will be carried out by Veolia/Peterson partnership with a target over 97% reuse/recycling for the structure.