The sequential replacement of ballast water at sea during the ship voyage is commonly used on board the ships. However, the successive emptying and filling of ballast tanks causes the occurrence of hazards to ship’s safety. The article presents hazards to ship’s safety and the calculations have been performed of the most dangerous hazards in respect of ship operation, for the m/v „Orla” ship on calm water. The obtained service conditions of the ship during replacement of ballasts shall be the basis for calculating the ship’s safety hazards on waves.
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