Evaluation of the limit ice thickness for the hull of various Finnish-Swedish ice class vessels navigating in the Russian Arctic

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Researchers

Research units

  • Finnish Transport Safety Agency

Abstract

Selection of suitable ice class for ships operation is an important but not simple task. The increased exploitation of the Polar waters, both seasonal periods and geographical areas, as well as the introduction of new international design standards such as Polar Code, reduces the relevancy of using existing experience as basis for the selection, and new methods and knowledge have to be developed. This paper will analyse what can be the limiting ice thickness for ships navigating in the Russian Arctic and designed according to the Finnish-Swedish ice class rules. The permanent deformations of ice-strengthened shell structures for various ice classes is determined using MT Uikku as the typical size of a vessel navigating in ice. The ice load in various conditions is determined using the ARCDEV data from the winter 1998 as the basic database. By comparing the measured load in various ice conditions with the serviceability limit state of the structures, the limiting ice thickness for various ice classes is determined. The database for maximum loads includes 3-weeks ice load measurements during April 1998 on the Kara Sea mainly by icebreaker assistance. Gumbel 1 distribution is fitted on the measured 20 min maximum values and the data is divided into various classes using ship speed, ice thickness and ice concentration as the main parameters. Results encouragingly show that present designs are safer than assumed in the Polar Code suggesting that assisted operation in Arctic conditions is feasible in rougher conditions than indicated in the Polar Code.

Details

Original languageEnglish
Title of host publicationProceedings of the 24th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC'17
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Port and Ocean Engineering Under Arctic Conditions - Busan, Korea, Republic of
Duration: 11 Jun 201716 Jun 2017
Conference number: 24

Publication series

NameProceedings : International Conference on Port and Ocean Engineering Under Arctic Conditions
PublisherPOAC
ISSN (Print)0376-6756
ISSN (Electronic)2077-7841

Conference

ConferenceInternational Conference on Port and Ocean Engineering Under Arctic Conditions
Abbreviated titlePOAC
CountryKorea, Republic of
CityBusan
Period11/06/201716/06/2017

    Research areas

  • limit ice thickness, loads, polar code, serviceability

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