Author(s): Vegard Aksnes; Basile Bonnemaire; Sveinung Loset; Christian Lonoy
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Abstract: The Arctic Tandem Offloading Terminal (ATOT) is an innovative concept for offloading of hydrocarbons in ice-infested waters. The concept includes an offloading icebreaker (OIB) with a submerged turret loading system and a shuttle tanker. The OIB is moored to a turret buoy, and shuttle tankers moor at the stern of the OIB for offloading. The ATOT concept has been tested in model scale in the Large Ice Model Basin at HSVA in Hamburg, Germany. This paper discusses results from two tests in level ice and ridges; that is, the measured forces in the tandem mooring system between the vessels as well as the relative motions between the tanker and the OIB. The interaction between the ATOT and ridges is studied and it is seen that the largest tandem mooring forces are occurring during ridge penetration. The qualitative behaviour of the ATOT during slow changes of ice drift direction is analysed.
Year: 2008