Sietas to complete specialist ship

12 Aug 2011
‘Stornes’ alongside in Hamburg

‘Stornes’ alongside in Hamburg

Van Oord, the Dutch dredging, marine and offshore contractor, has engaged the Sietas shipyard in Hamburg for the final fitting-out and commissioning of its new flexible fallpipe vessel Stornes.

Stornes is 175m long, 26m wide, has a draught of 10.67m and a moulded depth of 14.50m. Her cargo capacity is 27,000tons and, fully loaded, she has a speed of 14.7 knots. She can place rock at a depth of more than 1,500m.

Van Oord awarded the contract for building the challenging self-unloader Stornes to the Chinese Yantai CIMC Raffles Offshore shipyard in 2006. Main construction was complete by summer 2011, but installation of the unloading system and part of the commissioning and tests of the Stornes remained to be done. To adhere to the remaining schedule, the operating company decided to transfer the vessel to the Norderwerft shipyard for this work.

The specialist offshore vessel was transferred to the port of Hamburg from the Chinese yard. She docked at the fitting-out pier of the Sietas Group’s Norderwerft shipyard and over the next weeks, the Sietas and Norderwerft shipyards and Van Oord will carry out the necessary work before the Stornes sets out for her first assignment. The vessel’s flexible fallpipe system and the ROV will be installed at Seitas in collaboration with engineers and experts from Van Oord. This will be followed by loading tests and commissioning of the rock dumping equipment, the ROV and the DP2 system off the coast of Norway.

The Stornes is the fourth flexible fallpipe vessel in the Van Oord fleet. This special type of self-unloader is used on offshore projects, such as installation of rock to secure oil and gas pipelines or installation of foundations for offshore wind farms. Van Oord developed the flexible fallpipe technology in-house. This is a highly flexible ‘open’ tube that permits the accurate placing of different sizes of rock. Under water, it is guided by a computer-monitored ROV navigation unit. This guarantees accurate placement of the rocks at depth. In addition, the Stornes has a DP2-system that maintains the ship’s position during the assignment, even with strong currents and wind during winter operations at the North Sea.

“We greatly appreciate the confidence that Van Oord has shown in us with this contract,” said Rüdiger Fuchs, CEO of the Sietas group. “Sietas has many years of experience and extensive know-how in the building of self-unloading bulk carriers. With the Sietas and Norderwerft shipyards, part of the maritime Sietas group, we offer integrated solutions from a single source. That means unrivalled quality, efficient cost management, high productivity and adherence to schedules. Testing and commissioning are highly demanding, complex tasks that the Sietas shipyard is delighted to undertake for Van Oord.”

Jaap Bakker, manager plant design & construction at Van Oord, added: “Our excellent experience during development of the Jack-up vessel recently ordered from Sietas for offshore wind farm installation made us decide to prepare the Stornes for final commissioning and testing in Hamburg.”

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