An error in the blade fatigue design criteria in the Finnish-Swedish Ice Class Rules
There is an error in Section 184.108.40.206 of the 2017 version of the Finnish-Swedish Ice Class Rules (TRAFI/494131/03.04.01.00/2016). The error concerns the simplified methodology for that can be used to indicate that fatigue calculations can be omitted from the design process.
This error means that the simplified criterion is not conservative as intended and can lead to designs passing the simplified criterion even though they would not pass the full fatigue criteria in the rules.
The 2017 version of the FSICR, which this error concerns, applies to ships contracted for construction on or after 1 January 2019 with possibility of voluntary application from 1 December 2017.
The intention of the Finnish Transport and Communications Agency Traficom is to correct the error as soon as possible with an updated version of the rules.
Further information concerning the error can be found from the information letter sent to Classification Societies and manufacturers as well as a report from the Technical Research Center of Finland, VTT.
Special Adviser Lauri Kuuliala, lauri.kuuliala(at)traficom.fi, +358 29 534 7078