To main content

Transport and installation Aasta Hansteen
spar platform

For the Statoil Aasta Hansteen project, Dockwise has transported the newbuild spar hull from the HHI fabrication yard in Ulsan, South Korea to the offshore discharge location near Høylandsbygd, Norway. The spar is the world’s largest spar ever built to date. 

On 26 April 2017, Statoil's huge Aasta Hansteen spar - the world's largest and Norway's first - set sail from Hyundai Heavy Industries shipyard, bound for Norway. The journey, aboard Boskalis' Dockwise Vanguard heavy transport vessel is about 14,500 NM long and will take about two months. Once in Norway, the spar hull will be floated off and later this year the 25,000-tonne topsides will be mated by means of a catamaran float-over. Following commissioning work, the spar will then be towed into the Norwegian Sea to be moored at the Aasta Hansteen field and is due onstream in 2018. Statoil’s Aasta Hansteen spar development will move Norwegian operations into a new deepwater environment. The spar will be moored in 1300m water depth in the Norwegian Sea – the deepest previous project is Shell’s Ormen Lange, at 900m. The Aasta Hansteen facility will be Norway’s first spar project (as well as being the world’s largest spar), the country’s first use of steel catenary risers (SCRs), the first synthetic rope mooring spread offshore Norway and the first use of mechanically lined pipe installed using reel-lay in the country.

Living quarters

For this project the Dockwise already loaded the Aasta Hansteen living quarters on board the semi-submersible vessel Swan in November 2015 and transported it to the Hyundai Heavy Industries construction yard where it was integrated with the new-build topsides.

Topsides installation

In the summer of 2017 the Aasta Hansteen topsides will be transported on board the Dockwise White Marlin from South Korea to Norway. Later this year the topsides will be installed by means of a dual-barge float-over by two Dockwise semi-submersible vessels.

Related projects

Selected filters
111-1126_IMG_header.jpg

Deepening of the Eems-pipeline

The 42" Eems pipeline is part of the pipeline connection between the gas cleaning and drying plant of Phillips Petroleum at Rysumer Nacken in Germany, and the natural gas pipeline network in the Netherlands. The gas is obtained from the Ekofisk gas field in the Norwegian region of the North Sea. The pipeline crosses the morphologically dynamic Eems estuary over a length of 4 km, passing both the deep shipping lane ‘Oostfriesche Gaatje’ and the shallow sand bank ‘Paap’.

Development gas export pipeline,
Hibiscus to Point Fortin

The NCMA Development Project comprised the development of the North Coast Marine Area, which is located in the Caribbean Sea and Bay of Paria, Trinidad. The project included the installation of a 24" Gas Export Pipeline from the Hibiscus Platform to a landfall at Point Fortin. From the landfall the pipeline was routed by directional drilling and by surface laid pipeline, to a termination point in the Atlantic LNG Terminal at Point Fortin. As part of this project Boskalis was awarded the contract for the provision of landfall, directional drilling and onshore pipeline installation and testing of the 24" gas pipeline system.

Sandpiper_foto_offshore_2_header.jpg

Hanze F2a Development Project

Hanze, 200 kilometers offshore Den Helder in block F/2 of the North Sea, is the first operated development in the Dutch sector by Germany's Veba Oil. The oilfield reserved approximate 34 million bbl, plus 40 bcf of associated gas. 

Installation gas pipeline, Takoradi

Late November 1998 Boskalis was awarded a subcontract for the installation of two marine pipelines to supply and discharge cooling seawater for the Takoradi thermal power plant that was under construction for the Volta River Authority, near the village of Aboadze approximately 20 kilometers north-east of Takoradi, Republic of Ghana.

WD_Fairway_and_Sandpiper_near_platform_header.jpg

Re-insulation Gannet 'C' Bundles, North Sea

The Gannet 'C' satellite field, which is located in the North Sea at 112 miles East of Aberdeen in 95-meter water depth, comprises four drill centres, each having one or more producing wells. The drill centres are connected to the local platform Gannet 'A' by four flowline bundles with a total length of 10 kilometers. A glycol-based gel, filling the annulus of the Gannet 'C' carrier pipe, insulated the individual flow lines. Prompted by degradation of the gel and the resulting drop in oil and gas arrival temperatures at the platform, an EPIC project took off for a re-insulation system. The objective of the re-insulation system was that it should provide sufficient insulation to the bundles in order to safeguard production during the total field life of Gannet 'C', being a minimum lifetime of 15 years. Boskalis Offshore was supported by Hydronamic - the in-house engineering department.