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MSW Reportal

Ice Classes and Requirements

Defining ice-strengthening requirements, the Swedish Maritime Administration uses the Finnish-Swedish Ice-Class Designations valid from 2009. The maximum ice-class draught amidships shall normally be taken as the summertime fresh-water load line draught according to Finnish-Swedish Ice-Classes TSFS 2009:111.

The Finnish Transport Agency(FTA) and the Swedish Maritime Administration (SMA) have developed the Finnish – Swedish ice class rules in co-operation with classification societies. The first version of Guidelines for the Application of Finnish-Swedish Ice Class Rules was puplished 20 December 2005. These guidelines will be updated and complemented as the development of rules continues.

For vessels that according to provisions in TSFS 2011:96 (Finnish-Swedish ice class) are existing vessels and holds ice class IA Super and IA, the older provisions concerning machine effect apply until January 1, 2005 or January 1 the year when 20 years have passed since the vessel was delivered, depending on which falls last.

The vessel's engine power is considered to be the total propulsion machinery power for which the vessel and machinery are designed. If technical means are used to prevent the machinery from being driven with full power, or if this is prohibited according to regulations being followed on board, then the power limited in this manner is considered to be the vessel's engine power.

Finnish-Swedish Ice-Class Designations


Ice Class For navigation in  Metres
1A Super  extremely difficult ice-conditions  >1,0 m
1A  difficult ice-conditions  >0,5-1,0 m
1B  moderately difficult ice-conditions  0,3-0,5 m
1C easy ice-conditions  0,15-0,3 m
II  very easy ice-conditions  0,1-0,15 m


Requirements for ice class and tonnage size

For shipments to northern Sweden the following are the dates on which restrictions for traffic at sea normally come into force:

At least class/least dwt The Bay of Bothnia  The Bothnian Sea
II/2000 1 December  1 January
1C/2000  15 December 15 January
1B/2000  1 January 1 February
1A/3000  15 January  15 February
1A/4000  31 January  -
1A/3000 10 April -
1B/2000  10 May  1 April
II/2000  15 May 15 April



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Last updated 2021-02-25