Appendices 
89 
Appendices 
Appendix 1 Hull-retaining support structure for offshore wind turbines and off 
shore stations 
As a rule, the evaluation of the behaviour in the case of a collision due to an offshore wind tur 
bine is based on the appropriate standard incidental provision of the certificates of admission 
according to the SeeAnIV. It shall be assumed that the support structure of an offshore wind 
turbine is hull-retaining or “collision friendly”, if an offshore wind turbine, as a consequence of 
collision, does not fall onto the ship, the ship remains floatable and there is no leakage of pol 
lutants. In practice, the evaluation of the behaviour in the case of a collision is conducted on 
a risk-based approach, i. e. the probability of a collision and the extent of possible damage to 
the ship and its crew as well as to the marine environment are all taken into account. 
The method of risk classification and analysis shall be based on the German Hazardous Inci 
dent Ordinance (Stôrfallverordnung), the British Safety Case Regulations for offshore installa 
tions and the IMO regulations. 
To evaluate the support structure, it is recommended to use the process described in Figure 1 -1.1. 
Figure 1-1.1 : Flow-chart for hazard analysis 
The evaluation of hull-retaining behaviour shall be conducted according to the following steps: 
• Analysis of the frequency of occurrence of various collision scenarios. The frequency of oc 
currence is determined on the basis of the risk analysis introduced in the respective appro 
val procedure, as well as in consideration of the criteria defined by the BMVI working group 
“Approval-relevant Recommended Guidelines” with regard to risk analysis and assess 
ment. This must be based on the cumulative probability of occurrence in consideration of 
all systems planned or installed within the same space reserved for traffic. 
• Selection of reference ships as a basis for the collision analysis, 
• Collision analysis for selected scenarios, and 
• Risk analysis and assessment on the basis of a risk matrix. 
The individual steps are detailed in the following.