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Part B - Certificates and approval requirements 
The following data shall be presented at least: 
• Site and configuration of the offshore wind farm with coordinates for all offshore wind turbines, 
transformer substation and any additional construction components 
• Soil attributes: 
Geotechnical and geophysical programme of investigation 
Geotechnical report and data of surveys carried out: Evaluation of pressure soundings and 
drilling trials, derivation of soil parameters for calculations 
Conformity with the „Standard for Geotechnical Site and Route Surveys“ standard [1] of the 
BSH; the certifier/registered inspector evaluates whether the presented survey concept meets 
the BSH standard or, in case of deviations, whether these are sufficiently justified and accept 
able 
• Wind data; 
• Maritime conditions (water depths/levels, wave data, tides, correlation of wind and waves, ice drift, 
currents, scouring, fouling, etc.) 
As a rule, reports by suitable expert bodies shall be prepared for recording the aforementioned data. 
The certifier/ registered inspector checks the completeness of the reports and evaluates the plausibil 
ity of the data. 
In order to be able to provide a catalogue of requirements for structural designs that is as complete and 
reliable as possible, additional data is contained in the design basis in addition to the aforementioned 
site conditions: These are: definition of the loading conditions used for dimensioning, definition of the 
standards and directives to be used for structural design, materials, corrosion protection, etc. as well 
as a description of special certification methods if these are not apparent from standards or directives. 
These points are also checked and evaluated by the certifier/registered inspector as part of the evalua 
tion of the design basis. 
3.2.2 Loading assumptions 
Loading conditions relevant for design are to be defined based on the site conditions and the design 
basis as well as the operation and safety concept of the offshore wind turbines. The scope of the load 
ing condition definitions shall be evaluated by the certifier/registered inspector. It is recommended for 
the loading conditions to be evaluated by the certifier/registered inspector before the simulation and 
calculation of loading assumptions starts, in order to avoid duplicating simulations. All loading condi 
tions are to be considered that are necessary in order to demonstrate the structural integrity of the 
offshore wind turbines. A basic differentiation is drawn between operational stability loads for dem 
onstrating operational stability and extreme loads for demonstrating general stability against collapse 
(strength, stability, external stability against collapse). The operational stability loads shall represent 
operation of the offshore wind farm over a service life of at least 20 years. The extreme loads shall 
include all events that can lead to the great-est possible loads, given consideration for the probability 
of simultaneous occur-rence (e.g. ,,50-year gust“, ,,50-year wave“, extreme angle of approach of the 
rotor, collision with ship (service ship), ice pressure, etc. 
The combination of external conditions and system statuses shall be represented and justified for the 
corresponding project and the site according to (or if necessary based on) the applicable guidelines 
and standards. The partial safety factors of the effects of the codes of practice used shall be taken 
into account. The calculation methods, e.g. simulation processes, number of implementations and 
combination of wind and wave loads, shall be described and any simplifying assumptions shall be 
justified. 
Once the loading condition definitions have been defined and evaluated, load calculations shall be per 
formed with regard to the complete structural dynamics and presented to the certifier/registered inspec 
tor for examination. The certifier/registered inspector checks the plausibility of the loading assumptions