1/28/2024 0 Comments Draugen kickstarterOnce the GBS was safely moored in the fjord during June 1991, work began to raise the support shaft to its planned height of 70 metres above the planned seabed level (ie, excluding the skirts).Īt the same time, the storage cells were also readied for casting the domes which form their roofs. The retaining wall was removed and air pumped into the space under the skirts to provide sufficient buoyancy. Three hectic months followed when the cell walls were cast to the desired height before the structure was floated out of the dry dock. Photo: Eivind Wolff/Norwegian Petroleum Museum bygging av betongdelen til plattformen, juni 1991, engelsk The GBS was safely moored in the fjord during June 1991. A big increase in reinforcement was needed to document that the walls were strong enough.” Fotnote: Interview with Wolff on 20 October 2016. “And, given the substantial pressure on the cast-in tubing, we ran the risk that the concrete would simply collapse. “While steel piping could be almost guaranteed not to leak, GRP presented a risk for leakage at the joints which we couldn’t ignore. The company was unused to this material, admits NC project director Eivind Wolff. Although a positive development, this also presented NC with some surprises. One of the technological advances on Draugen was that almost all the pipe systems were in GRP. In one of the shots, with the men bent over in the world’s narrowest workspace, one can be seen and heard to say with a grin: “This is a pipe show”. They had a video camera with them to document the repair. And reaching the leak point with tools and materials in a pipe 80 centimetres in diameter as well as getting safely back out was also an achievement, of course. Simply getting a man down such a narrow tube by rope ladder was considered almost impossible, but these lads did it. Fotnote: Epoxy, or artificial resin, is a liquid plastic substance which fuses with the substratum to function as a glue. They had with them what was needed to seal the leak with epoxy. The chosen repair method involved sending people through the narrow pipe from about four metres above the manifold. All the pipes are manufactured in glassfibre-reinforced plastic (GRP) surrounded by reinforced concrete.Ī conductor measuring 65 centimetres in diameter rises from the manifold to carry oil up to the topsides for treatment/processing and onward transport to a loading buoy.ĭuring pressure-testing of this piping system, the cast-in manifold was found to have a leak. This is shaped like a doughnut with a diameter of about 30 metres. Pipes conducting oil to and from storage run through the cell walls and into the central cell, where they terminate in a manifold measuring 80 centimetres in diameter. ![]() The bottom section of the GBS comprises seven oil storage cells clustered around a central cell, which forms the lowest part of the shaft. Before that got properly under way, however, the first mechanical outfitting for the support shaft was positioned in February 1991. When the skirts had been completed in October, work could begin to construct the formwork for the actual storage cells. ![]() bygging av betongdelen til plattformen, feb 1991, engelsk, The first mechanical outfitting for the support shaft was positioned in February 1991. Photo: Eivind Wolff/Norwegian Petroleum MuseumĪt the same time, the tethering blocks for the Snorre A concrete tension-leg platform were under construction on two barges moored alongside the dry dock.īuilding four very different offshore structures simultaneously meant this was an extremely busy time for Norwegian Contractors (NC). 1990 Busy days for Norwegian Contractors as they were building four platforms simultaneously. bygging av betongdelen til plattformen, sept. The first job was to cast the nine-metre-high skirts which would ensure that the platform would dig into the seabed and withstand all kinds of weather out on the field. ![]() The Sleipner A GBS lay already in the fjord.ĭuring the summer, the dry dock was emptied of water and work could begin in August on the lowest part of the storage cells and central support shaft for the Draugen structure. At the same time, plans were laid to tow the base section for the Gullfaks C GBS from the adjacent dry dock into the Gands Fjord immediately outside. The sheet pile retaining wall for a dry dock at Jåttåvågen in Stavanger was established in June 1990. ![]() © Norsk Oljemuseum bygging av betongdelen til plattformen, juni 1990, engelsk The sheet pile retaining walls have been set up to make a dry dock.
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