Jumbo Shipping Completes Hornsea Two OWF Transition Piece and Monopile Transport for DEME Offshore
Jumbo has completed the transport and handling of offshore wind turbine foundation components for Ørsted’s Hornsea Two offshore wind farm. Supporting DEME Offshore, Jumbo deployed its K-3000 class heavy lift vessel Fairmaster to carry out its scope of transporting 141 monopiles (MPs) and 131 transition pieces (TPs) from Rostock, Germany and Aalborg, Denmark to Eemshaven, the Netherlands.
The key asset that Jumbo brought to this project was the Fairmaster. This 152.9 metre-long heavy lift vessel, with two 1,500-tonne cranes, provided a flexible deck layout that very much benefited the project’s transport schedules. Jumbo could offer three different loading configurations without intermediate standby periods for re-configuration: five MPs loaded on deck and in the hold, six TPs and three MPs, or three TPs and four MPs. “This engineered flexible solution made it an extremely efficient vessel for the project and is one of the things we’re most proud of – it helped us conclude the project scope within just 37 voyages in a period of just under twelve months,” says Jumbo’s project manager Maarten De Gruyter.
Jumbo’s contribution to the project becomes even more significant when the specs of the transported components are taken into account. The MPs in particular were 8.5 to 9.5 metres in diameter and weighed up to 1,285 tonnes. Because of the repetitive nature of the job, the company paid special attention to maintaining a clear focus on safety throughout the project. Jumbo treated every lift as a heavy lift with a high focus on bringing these major cargoes safely on board. To this end, Jumbo brought in an external safety consultant to investigate and prevent complacency on board.
The efficiency of execution was due to numerous aspects. “During the planning phase, we designed and engineered the MP saddles and TP grillages to deliver our proposed vessel efficiency. We used inlays in the saddles to accommodate the different diameters of the MPs. The clearances were tight: sometimes 50cm or less between components,” says De Gruyter. “We also installed project-specific lifting lugs on the deck hatches to speed up loading and unloading operations. This is an example of one of our value engineering proposals – smart ideas that we present to our clients to optimise operations.”
As part of reducing the environmental footprint of the construction of the Hornsea Two offshore wind farm, Jumbo was required to include a Green Initiative into its project execution. As such, the company contributed to Ørsted’s goal of decreasing the environmental impact of the construction on the Hornsea Two wind farm. Jumbo’s chosen solution was to sail with Bio-Fuel Oil which is expected to deliver 80-90% CO2 reduction versus fossil equivalents and contains no sulphur oxide (SOx) emissions.