The 105K COT (105,000 DWT Crude Oil Tanker) is being continuously constructed at the ground yard of HHI (Hyundai Heavy Industries), Ulsan, Korea as the first ground construction for ship type structures. She is loaded out transversely from the quayside by skidding onto the DBU (Double Barge Unit). The DBU will then be towed to a pre-determined site and ballasted down to float-off the 105K COT from the DBU. This paper describes the motions, mooring forces, collision possibilities and constraint forces of DBU / 105K COT during load-out, towing and float-off of the 105K COT.

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