It crossed the 62nd parallel – the northern boundary of the North Sea – at 04.58 on 11 May, and reached its destination on 13 May. The operation took 10 days at an average speed on 1.5 knots. Completing the voyage without risk depended more than ever on a long period of fine weather. Six big tugs with a combined 75 000 horsepower in bollard pull were needed to cover the 830 kilometres to the field.Īs mentioned above, this was the longest-ever tow for a Condeep platform. In beautiful weather, the tow-out began on 3 May. Photo: Dag Magne Søyland/Norwegian Petroleum Museum bygging av betongdelen til plattformen, plattformen plasseres på feltet, utslep, engelsk, Draugen being towed from Yrkjefjorden to the Draugen field on Haltenbanken. The mating operation was completed entirely to plan, and all that remained before the platform could begin its journey north was to hook up piping and cable systems. The maximum permitted deviation from an ideal match of topsides and shaft was a mere 40 millimetres – so accuracy was essential in all stages of the operation.Īs large volumes of water were pumped from its storage cells, the GBS rose, took over the weight from the barges and continued to raise the topsides high above the sea surface. Mating was accomplished by manoeuvring the barges into position over the concrete shaft and deballasting the gravity base structure (GBS). bygging av betongdelen til plattformen, engelsk, plattformen plasseres på feltet, The topside was mated with the GBS in Yrkjefjorden. On 6 March, this structure was transferred to two huge barges and towed to Vats by five tugs. In the meantime, the topsides were being completed at Stavanger’s Rosenberg Verft yard. Photo: A/S Norske Shell/Norwegian Petroleum Museum plattformen plasseres på feltet, engelsk, The topside is placed on two huge barges and towed to Vats by five tugs. This operation was a nervous time, with the Sleipner sinking (see separate article) the year before still fresh in the minds of most people present. On 24 March, the concrete structure underwent a trial submersion which left only a few metres of the shaft visible above the sea surface. The Condeep monotower was readied in March 1993 to receive the topsides, which were to be towed from Stavanger to the deepwater mating site at Vats. bygging av betongdelen til plattformen, plattformen plasseres på feltet, forsidebilde The GBS raises high against the sky where it is located in Yrkjefjorden, soon ready to be mated with the topside. It was also the first fixed installation to be positioned above the 62nd parallel – making the tow-out the longest to date on the Norwegian continental shelf (NCS). To start with, the platform ranked at the time as the tallest structure ever towed.
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