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The gas production platform Sea Troll in the North Sea

Sunday, 1 March 2015 - 01:00 pm (CET/MEZ) Berlin | Author/Destination: European Free Trade Association
Category/Kategorie: General, House of the Month Reading Time:  6 minutes

🔊 Listen to this Post The Troll A platform is a condeep offshore natural gas platform in the Troll gas field off the west coast of Norway. It is the tallest structure that has ever been moved to another position, relative to the surface of the Earth, and is among the largest and most complex engineering projects in history. The platform was a televised sensation when it was towed into the North Sea in 1996, where it is now operated by Statoil.

The Troll A platform has an overall height of 472 metres (1,549 ft), weighs 683,600 tons (1,2 million tons with ballast) and has the distinction of being the tallest structure ever moved by mankind. The platform stands on the sea floor 303 metres (994 feet) below the surface of the sea and one of the continuous-slip-formed concrete cylindrical legs (the leg containing the import and export risers) has an elevator that takes over nine minutes to travel from the platform above the waves to the sea floor. The walls of Troll A’s legs are over 1 metre thick made of steel reinforced concrete formed in one continuous pour and each is a mathematically joined composite of several conical cylinders that flares out smoothly to greater diameters at both the top and bottom, so each support is somewhat wasp-waisted viewed in profile and circular in any cross-section. The concrete legs must be able to withstand intense pressure so are built using a continuous flow of concrete, a lengthy process that takes 20 minutes per 5 cm laid. The four legs are joined by a “Chord shortener”, a reinforced concrete box interconnecting the legs, but which has the designed function of damping out unwanted potentially destructive wave-leg resonances by retuning the leg natural frequencies. Each leg is also sub-divided along its length into compartments a third of the way from each end which act as independent water-tight compartments. The legs use groups of six 40 metres (130 ft) tall vacuum-anchors holding it fixed in the mud of the sea floor. Troll A was built by Norwegian Contractors for Norske Shell, with base construction beginning in July 1991 at a cost of 4150 million NOK, or approximately US$650,000,000 at the time. The base and the deck were built separately, and were joined in 1995 while the base was partially submerged. The Troll platform was towed over 200 kilometres (120 mi) from Vats, in the northern part of Rogaland, to the Troll field, 80 kilometres (50 mi) north-west of Bergen. The tow took seven days. In the fall of 2010 the Troll A platform was expanded with a new module. This module contains living quarters and a new control room. The new control room and expanded facilities are needed to support the new compressors (a 3rd and 4th are planned and being installed in 2014). These compressors are needed due to the dropping reservoir pressure in the wells. On 18 June 2013 the new support module M12 for compressor 3 and 4 was lifted on board Troll A. The increased electricity consumption of these compressors required new power cables from shore, and due to grid constraints the platform is cut off from shore power if a grid emergency arises. Gas rises from 40 wells, and is exported through a number of pipes, to a processing plant at Kollsnes. Troll A is scheduled to receive two additional gas compressors to increase production volume and compensate for dropping reservoir pressure in the wells.

In 1996 the platform set the Guinness World Record for ‘largest offshore gas platform’. In 2006, the 10th anniversary of Statoil’s operatorship of Troll gas production was celebrated with a concert by Katie Melua held at the base of the Troll A platform. As well as entertaining the workers on the rig, the concert set a new world record for the deepest underwater concert at 303 metres below sea level.

Read more on equinor.com – Troll Gas and Wikipedia Troll A platform. Learn more about the use of photos. To inform you about latest news most of the city, town or tourism websites offer a newsletter service and/or operate Facebook pages/Twitter accounts. In addition more and more destinations, tourist organizations and cultural institutions offer Apps for your Smart Phone or Tablet, to provide you with a mobile tourist guide (Smart Traveler App by U.S. Department of State - Weather report by weather.com - Global Passport Power Rank - Travel Risk Map - Democracy Index - GDP according to IMF, UN, and World Bank - Global Competitiveness Report - Corruption Perceptions Index - Press Freedom Index - World Justice Project - Rule of Law Index - UN Human Development Index - Global Peace Index - Travel & Tourism Competitiveness Index). If you have a suggestion, critique, review or comment to this blog entry, we are looking forward to receive your e-mail at comment@wingsch.net. Please name the headline of the blog post to which your e-mail refers to in the subject line.

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