Author(s): Basile Bonnemaire; Trine Lundamo; Karl-U. Evers; Sveinung Loset; Arnor Jensen
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Abstract: A new concept for offshore offloading in ice-infested waters is proposed. The concept, Arctic Tandem Offloading Terminal (ATOT), comprises two units; a turret moored offloading icebreaker (OIB) and an offloading tanker in tandem. The concept was tested at scale 1:24 at the HSVA ice tank in Hamburg, Germany. The model tests included the simulation of ridge penetration of deep ice ridges. Four ice ridges up to 15.5 m deep were built and the offloading concept was towed several times through these ridges. It was observed that the side mooring loads which are highly dependent on the boundary conditions contributed significantly (30 % on average) to the maximum mooring loads. The OIB was equipped with 4 powerful azimuth propellers, 2 at the bow and 2 at the stern. During ridge interactions those were used for ice milling and for mooring load reduction. It was seen that their thrust effect was limited due to heavy ice interaction. The measured mooring loads are compared with mooring load estimates based on former measurements (model and full scale). The correlation between estimates and measurements is rather good.
Year: 2008