FPSO spar Platform Jobs
The Aasta Hansteen FPSO spar is a Spar gas platform designed by Technip-USA, built by Hyundai Heavy Industries in South Korea. The Aasta Hansteen FPSO SPAR is a gas production and storage platform that will be operated by Statoil on the Aasta Hansteen field approximately 300 kilometers off the coast of Norway. The SPAR consists of a lower part, referred to as the hull or substructure, and the topsides on top of the SPAR hull.
Statoil's gigantic Aasta Hansteen spar; the world's largest and Norway's first, at the end of April 2017, set sail from Hyundai Heavy Industries shipyard, bound for Norway. The journey, aboard Boskalis' Dockwise Vanguard heavy transport vessel was about 14,500 NM long and took two months. In Norway, the spar hull was floated off and later in year the 25,000-tonne topsides was 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.
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 up till now. Before installation, the SPAR hull was transported horizontally by Boskalis from the shipyard in South Korea to a fjord near Stavanger in Norway. This massive cylindrical buoy, with a diameter of 50 meters, length of 198 meters and weight of 46,000 tons, was transported by the Dockwise Vanguard earlier this year (2017). The company then transported the 24,300 tons topside which was also built in Korea. This operation was carried out with the White Marlin, the newest and second largest vessel in the Dockwise fleet.
Dutch marine company Boskalis has completed a remarkable dual vessel float-over operation of the Aasta Hansteen topside in Norway. The company, over the last several of years through its subsidiary Dockwise, has played a vital role in the transportation of the Aasta Hansteen SPAR from South Korea to Norway, along with the topside installation. Boskalis broke a number of engineering records in the process of installation of this Spar, including the transport of the largest and heaviest SPAR ever, the largest catamaran topside float-over and more than 100,000 worked hours with zero lost time injuries.
On site spar hull was partially submerged by filling ballast tanks to 177 m and anchored to the seabed, leaving only the top 21m above the surface. The seabed moorings were primarily made of cut resistant polyester and steel chain. At a height of 198m (out of which 177m was submerged) and diameter of 50m this is the biggest spar platform hull ever built in terms of diameter and displacement. The spar hull is a Truss Spar type allowing condensate to be stored in the hull beneath sea level and offloaded to a shuttle tanker.
The produced gas will be exported to the shore with rigid Steel Catenary Risers (SCR). The Production import risers will also be SCRs, first time of application of SCRs in the Norwegian Sea. The Aasta Hansteen spar will export the natural gas from the field through the yet to be built Polarled pipeline to the Nyhamna processing plant on the Norwegian coast. The project costs 31 billion NOK.
The third and final phase was the installation of the topside on top of the SPAR hull. Once the White Marlin arrived in Norway, the topside was transferred onto two S-class vessels, the smallest in the Dockwise fleet. The two vessels created a type of improvised catamaran. 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.
After precisely positioning these two ships on both side of the White Marlin, they started un-ballasting whilst the White Marlin ballasted down and maneuvered out from underneath. The result was a sort of catamaran structure with the topside linking the two hulls. Over the weekend, the catamaran structure with the topside was towed out to the vertical SPAR hull. Topside float over installation with the tip of the SPAR hull above the waterline in between the S-class vessels. Once everything was in position above the substructure, the mating operation between the hull and topside was successfully completed.
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. In the summer of 2017 the Aasta Hansteen topsides was transported on board the Dockwise White Marlin from South Korea to Norway. Later in 2017 the topsides was installed by means of a dual-barge float-over by two Dockwise semi-submersible vessels.
Aasta Hansteen gas field- Formerly called the Luva gas field and later renamed after Aasta Hansteen, it was discovered in 1997 approximately 300 km off the coast of Norway. During start up of the platform, the production from the surrounding Luva, Haklang and Snefrid gas fields will be exported to the platform. Future fields already discovered are planned to be tied back to the Aasta Hansteen platform through SCRs. Future expansion of additional risers and topsides facility are built-in in the design of the platform. The field is located north of the Arctic Circle, and is subject to sub-zero temperatures and perpetual darkness in the winter months.
Dutch marine company Boskalis has completed a remarkable dual vessel float-over operation of the Aasta Hansteen topside in Norway. The company, over the last several of years through its subsidiary Dockwise, has played a vital role in the transportation of the Aasta Hansteen SPAR from South Korea to Norway, along with the topside installation. Boskalis broke a number of engineering records in the process of installation of this Spar, including the transport of the largest and heaviest SPAR ever, the largest catamaran topside float-over and more than 100,000 worked hours with zero lost time injuries.
The produced gas will be exported to the shore with rigid Steel Catenary Risers (SCR). The Production import risers will also be SCRs, first time of application of SCRs in the Norwegian Sea. The Aasta Hansteen spar will export the natural gas from the field through the yet to be built Polarled pipeline to the Nyhamna processing plant on the Norwegian coast. The project costs 31 billion NOK. 
The third and final phase was the installation of the topside on top of the SPAR hull. Once the White Marlin arrived in Norway, the topside was transferred onto two S-class vessels, the smallest in the Dockwise fleet. The two vessels created a type of improvised catamaran. 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.
