Validation of the preliminary assessment regarding the operational restrictions of ships ice-strengthened in accordance with the Finnish-Swedish Ice Classes when sailing in ice conditions in polar waters

• Published in: Progress in the Analysis and Design of Marine Structures
• Main Authors: Kõrgesaar, Mihkel, Kujala, Pentti
• Other Authors: Insinööritieteiden korkeakoulu, School of Engineering, Konetekniikan laitos, Department of Mechanical Engineering, Aalto-yliopisto, Aalto University
• Format: Text
• Language: English
• Published: Aalto University 2017
• Subjects: Marine engineering; Mechanical engineering; ice class rules; polar water; ice strengthening; Arctic; Icebreaker
• Online Access: https://aaltodoc.aalto.fi/handle/123456789/27482

IMO has adopted the International Code for Ships Operating in Polar Waters (Polar Code) and related amendments to make it mandatory under both the International Convention for the Safety of Life at Sea (SOLAS) and the International Convention for the Prevention of Pollution from Ships (MARPOL). The Polar Code entered into force on 1 January 2017. To analyse the application of the Polar Code for the Finnish-Swedish Ice Classes, the following work was done by Aalto University: (i) The main objective of the study is to assess the validity of the preliminary assessment of the operational restrictions for ships ice-strengthened in accordance with different Finnish-Swedish Ice Classes. The assessment shall be done separately for independent operation in ice and operation with icebreaker assistance. A preliminary assessment can be found in section 8, 'Safe operational ice conditions for ships ice-strengthened in accordance with FSICR', of Appendix 3 of the document MSC 94/INF.13 (2014) 'Description of the Finnish-Swedish Ice Class Rules and their operational limitations'. This section is given also in Appendix A. (ii) The other objective is to assess and analyse the accidental limit state of ship hull structures designed in accordance with the Finnish-Swedish Ice Class Rules (2010), particularly of that of frames and plating. The aim is to determine the strength levels of ice-strengthened framing and plating, which are subject to local loads imposed by ice. In addition to simplified analytical equations used in class rules, state of the art design tools, such as finite element method, would be used to assess the accidental limit state. The investigation will show the safety margin with respect to accidental limit state as defined in the present rules. The report is divided to three parts. First part is the main project report. Second and third part are the conference papers that were published as part of this project. Please note, that the Second and third part are not included in the PDF file of the report for ...