Appendices 
107 
Appendix 4 Amendments to the verifications in the Fatigue Limit State for off 
shore wind turbines 
Until the introduction of national regulations by means of a DIN standard or an appropriate 
European standard, the values indicated in the following table, in combination with the regu 
lations of the current Directive for Wind Turbines concerning the partial safety factor y M for 
materials, are to be considered as minimum values for establishing a verification in the fatigue 
limit state. 
Verifiable 
Damage-Tolerant Components 
Non-Damage-Tolerant Components 
Yes 
1.0 
1.15 
No* 
1.15 
1.25 
* Welded constructions of the primary support structure that are situated under water must always be classified 
“No”. 
In order to demonstrate fatigue according to DIN EN 1993-1 -9, offshore-specific amendments 
may be necessary. Amendments may be required, in particular, for the number of anticipated 
load changes and in order to handle seawater. To this purpose, appropriate directives and 
codes of practice shall be consulted. 
Regarding the selection of material quality, please refer to the notes in Appendix 5. 
Note with respect to periodic inspections: 
This regulation does not replace the need for periodic inspections in the underwater area (e.g. 
to inspect growth and damage). However, this renders a detailed inspection of the weld seams 
dispensable.