Part  B  -  Certificates  and  approval  requirements

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•  Functional  tests  and  test  of  the  safety  system
•  Corrosion  protection
•  Check  for  damage
A  test  report  shall  be  prepared  after  completion  of  the  commissioning  inspection 1 '.

6.5  Periodical  inspections
6.5.1  General
The  entire  system  (turbine  and  support  structure)  shall  be  inspected  in  detail  as  part  of  the  periodical
inspections.  A  specific  checklist  for  the  facility  and  site  shall  be  prepared  for  the  test  on  the  basis  of  the
technical  documents,  and  shall  also  contain  the  evaluation  criteria.  The  intervals  for  recurrent  tests  shall
be  defined.  Periodical  inspections  shall  be  performed  annually  on  25%  of  the  offshore  wind  farms  of  an
offshore  wind  farm,  so  that  all  offshore  wind  turbines  will  have  been  inspected  after  each  block  of  four
years.  Central  structures  such  as  the  transformer  substation  shall  be  inspected  annually,  whilst  deviation
from  the  annual  inspection  is  permitted  for  other  individual  structures.  The  inspection  shall  be  performed
by  suitable  experts.

6.5.2  Evaluation  criteria  for  the  periodical  inspections
The  evaluation  criteria  for  periodical  inspections  shall  be  defined  with  regard  to  the  structure  and  site.

6.5.3  Documents  of  the  offshore  wind  turbines  to  be  tested
The  following  documents  at  least  shall  be  inspected  as  part  of  the  periodical  inspections:
•  Test  reports  or  certification  reports  with  all  appendices  and  supplements
•  Construction  approval
•  Operating  permit
•  Operating  instructions
•  Commissioning  report
•  Filled-in  technical  maintenance  specifications  for  the  offshore  wind  farm  including  the  support  structure ­
  and  scour  protection  (maintenance  logs)
•  Reports  on  previous  recurrent  tests  or  condition  inspections
•  Certificate  of  the  oil  quality
•  Documentation  of  modifications/repairs  made  to  the  installation  and,  if  necessary,  approvals

6.5.4  Scope  of  the  periodical  inspections
A  visual  inspection  of  the  installation  shall  be  performed  involving  inspection  of  the  individual  installation
components  including  the  rotor  blade  and  the  underwater  structure  as  well  as  the  scour  protection  from
immediate  proximity,  the  underwater  structure  shall  be  inspected  by  divers  or  with  a  camera  mounted
on  a  remotely  operated  vehicle  (ROV).  The  points  to  be  inspected  shall  be  cleaned  or  exposed  as  required. ­


1)  Note:  Commissioning  inspection  is  important  not  just  from  the  perspective  of  reliability  and  safety  of  the  offshore  wind  turbine. ­
  Following  commissioning,  the  standard  procedure  is  for  ownership  and  responsibility  to  be  transferred  from  the  manufacturer ­
  to  the  operator/owner.  Checking  the  condition  of  the  system  provides  a  certificate  from  an  independent  body  stating
that  the  offshore  wind  turbine  is  in  correct  condition.