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Rentoulis, I. (author)Heerema Marine Contractors (HMC) is a contractor that transports and installs large structures at sea. For this purpose, HMC operates four crane vessels of which three are semi-submersibles (Thialf, Balder and Hermod) and one is a mono hull (Aegir). The Balder is equipped with a J-lay tower for pipelay in deep water. During transits, when the...master thesis 2016