A gravity-based structure (GBS) is a support structure held in place by gravity, most notably offshore oil platforms. These structures are often constructed in fjords due to their protected area and sufficient depth.
A gravity-based structure (GBS) is a support structure held in place by gravity, most notably offshore oil platforms. These structures are often constructed in fjords due to their protected area and sufficient depth.
Prior to deployment, a study of the seabed must be done to ensure it can withstand the vertical load from the structure. [1] It is then constructed with steel reinforced concrete into tanks or cells, some of which are used to control the buoyancy. When construction is complete, the structure is towed to its intended location.
Notable GBSes include the 1997 Hibernia Gravity Base Structure off Newfoundland. Around 2020 GBSes became the fashion for Novatek's exploitation of the petroleum resources in the Gulf of Ob. [2]
Early deployments of offshore wind power turbines used these structures. As of 2010, 14 of the world's offshore wind farms had some of their turbines supported by gravity-based structures. The deepest registered offshore wind farm with gravity-based structures is the Blyth Offshore Wind Farm, UK, with a depth of approx. 40 m. [3]
Hibernia is an oil field in the North Atlantic Ocean, approximately 315 kilometres (196 mi) east-southeast of St. John's, Newfoundland, Canada, in 80 m of water.
EDF Energy is a British integrated energy company, wholly owned by the French state-owned EDF, with operations spanning electricity generation and the sale of natural gas and electricity to homes and businesses throughout the United Kingdom. It employs 11,717 people, and handles 5.22 million business and residential customer accounts.
The United Kingdom is the best location for wind power in Europe and one of the best in the world. The combination of long coastline, shallow water and strong winds make offshore wind unusually effective.
Wind power is the fastest-growing renewable energy technology in Scotland, with 11,482 megawatts (MW) of installed wind power capacity by Q1 2023. This included 9,316 MW from onshore wind in Scotland and 2,166 MW of offshore wind generators.
A floating wind turbine is an offshore wind turbine mounted on a floating structure that allows the turbine to generate electricity in water depths where fixed-foundation turbines are not feasible. Floating wind farms have the potential to significantly increase the sea area available for offshore wind farms, especially in countries with limited shallow waters, such as Spain, Portugal, Japan, France and the United States' West Coast. Locating wind farms further offshore can also reduce visual pollution, provide better accommodation for fishing and shipping lanes, and reach stronger and more consistent winds.
The Burbo Bank Offshore Wind Farm is a 348 MW offshore wind farm located on the Burbo Flats in Liverpool Bay on the west coast of the UK in the Irish Sea. It consists of an original 90 MW wind farm commissioned in 2007 and a 258 MW extension completed in 2017.
Offshore concrete structures, or concrete offshore structures, are structures built from reinforced concrete for use in the offshore marine environment. They serve the same purpose as their steel counterparts in oil and gas production and storage. The first concrete oil platform was installed in the North Sea in the Ekofisk oil field in 1973 by Phillips Petroleum, and they have become a significant part of the marine construction industry. Since then at least 47 major concrete offshore structures have been built.
The Hibernia Gravity Base Structure is an offshore oil platform on the Hibernia oilfield southeast of St. John's, Newfoundland, Canada.
Offshore wind power or offshore wind energy is the generation of electricity through wind farms in bodies of water, usually at sea. There are higher wind speeds offshore than on land, so offshore farms generate more electricity per amount of capacity installed. Offshore wind farms are also less controversial than those on land, as they have less impact on people and the landscape.
EDF Renewables is a wholly owned subsidiary of the French utility EDF Group, specializing in renewable energy production. As an integrated operator, the Group develops and finances the construction of renewable energy facilities, and manages operations and maintenance for its own account and for third parties.
Blyth Offshore Wind Farm was a small coastal wind farm located 0.5 miles (0.80 km) off the coast of Blyth, Northumberland, England.
GE Offshore Wind is a joint venture with Alstom and a subsidiary of GE Renewable Energy, created in 2015 when most of Alstom's electrical power and generation assets were acquired by General Electric. GE's stake in the joint venture is 50% plus 1 share.
The Beatrice Offshore Wind Farm now known as Beatrice Offshore Windfarm Ltd (BOWL) project, is an offshore wind farm close to the Beatrice oil field in the Moray Firth, part of the North Sea 13 km off the north east coast of Scotland.
Teesside Wind Farm, or alternatively referred to as Redcar Wind Farm, is a 27 turbine 62 MW capacity offshore wind farm constructed just to the east of the mouth of the River Tees and 1.5 km north of Redcar off the North Yorkshire coast, in the North Sea, England.
Suction caissons are a form of fixed platform anchor in the form of an open bottomed tube embedded in the sediment and sealed at the top while in use so that lifting forces generate a pressure differential that holds the caisson down. They have a number of advantages over conventional offshore foundations, mainly being quicker to install than deep foundation piles and being easier to remove during decommissioning. Suction caissons are now used extensively worldwide for anchoring large offshore installations, like oil platforms, offshore drillings and accommodation platforms to the seafloor at great depths. In recent years, suction caissons have also seen usage for offshore wind turbines in shallower waters.
Wind power in New Jersey is in the early stages of development. New Jersey has just six wind turbines, but the state has plans to develop several major offshore wind projects on the continental shelf of the Atlantic Ocean off the southern Jersey Shore. Legislation has been enacted to support the industry through economic incentives and to permit wind turbines on existing piers.
The tripod is a type of foundation for offshore wind turbines. The tripod is generally more expensive than other types of foundation. However, for large turbines and higher water depth, the cost disadvantage might be compensated when durability is also taken into account.
The VolturnUS is a floating concrete structure that supports a wind turbine, designed by University of Maine Advanced Structures and Composites Center and deployed by DeepCwind Consortium in 2013. The VolturnUS can support wind turbines in water depths of 150 ft (46 m) or more. The DeepCwind Consortium and its partners deployed a 1:8 scale VolturnUS in 2013. Efforts are now underway by Maine Aqua Ventus 1, GP, LLC, to deploy to full-scale VolturnUS structures off the coast of Monhegan Island, Maine, in the UMaine Deepwater Offshore Wind Test Site. This demonstration project, known as New England Aqua Ventus I, is planned to deploy two 6 MW wind turbines by 2020.
Ocean Wind was a proposed utility-scale 2,248 MW offshore wind farm to be located on the Outer Continental Shelf approximately 15 miles (24 km) off the coast of Atlantic City, New Jersey. It was being developed by Ørsted US Offshore Wind in conjunction with Public Service Enterprise Group (PSE&G). Construction and commissioning were planned for the mid-2020s. The closed Oyster Creek Nuclear Generating Station and B.L. England Generating Station would provide transmission points for energy generated by the wind farm.
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