National and International Standards for the Design of Offshore Substations. The Advantages of Offshore Substations Certification

Transcription

1 National and International Standards for the Design of Offshore Substations The Advantages of Offshore Substations Certification Folie 1

2 The two main Types of Certification Type or Component Certification Procedure by which a certification body gives written assurance that a wind turbine type or a component conforms to specified requirements. Project Certification Procedure by which a certification body gives written assurance that one or more specific wind turbines including support structure and possibly other installations are in conformity with requirements for a specific site. Folie 2

3 Type- or Component Certification It consists of the mandatory modules: design basis evaluation wind turbine or component design evaluation foundation design evaluation (optional) type testing foundation manufacturing evaluation (optional) type characteristic measurements (optional) manufacturing evaluation final evaluation Folie 3

4 Project Certification Project certification of offshore wind farms (OWF) consists of the following modules: site conditions evaluation design basis evaluation integrated load analysis site-specific wind turbine/rna design evaluation support structure design evaluation other installations design evaluation wind turbine/rna manufacturing surveillance support structure manufacturing surveillance other installations manufacturing surveillance project specific measurements (e.g. geotechnical surveys) transportation and installation surveillance commissioning surveillance final evaluation operation and maintenance surveillance Folie 4

5 Standards and Guidelines Standards and guidelines deal with type and project certification: IEC , Wind turbines Conformity testing and certification Germanischer Lloyd, Rules and Guidelines IV Industrial Services 2 Guideline for Certification of Offshore Turbines DNV-OSS-901, Project Certification of Offshore Wind Farms etc. Standards and guidelines deal with design of offshore substations: (It is important to take into account that these regulations refer to other standards and guideline which should also be taken into account for the design.) EN ISO 19902, Petroleum and natural gas industries - Fixed steel offshore structures Germanischer Lloyd, Rules for the Certification and Construction IV Industrial Services, 7 Offshore Substation DNV-OS-J201, Offshore Substations for Wind Farms etc. Folie 5

6 Certification Process of an Offshore Substation The scope of certification is an independent control procedure covering design, fabrication, installation and testing of an offshore installation. The certification assures the conformity with the current and agreed codes, standards, rules and specifications agreed with the operator respectively owner of the OWF. Topics: - Basic Design Final result: - Detailed Design - Fabrication - Equipment Statement of Compliance - System - Structure - Installation - Top side Facilities The scope of the certification may also take into account the requirements of responsible authorities (e.g. BSH in Germany). Folie 6

7 Advantages of Certification Consideration of the requirements of the responsible authorities at an early stage of the project. Verification of compliance of the current applicable standards and guidelines by an independent body. The verification as well as the design calculation will be issued according to the state-of-the-art. Special or critical details of the structure can be identified at an early stage of the project. Thus these can be dealt with in good time, avoiding later delay of the project. Inspections during fabrication can reduce the scale of the inspections required by the Quality System (QS) of the owner. (Note: Certification does not replace the owner s own QS of a project) For the bankability and the insurance an independent verification will be generally required. Folie 7

8 Examples of positive Input due Certification (1-4) Consideration of the needs of the responsible authorities with regard to the fire protection system and the evacuation plan. The decision on which fire fighting system will be required should be based on requirements of the responsible authorities in compliance with occupational health and safety standards. The fire fighting system has a direct effect to the structural design of the substation (mass of the tanks, pipes routes, escape routes, fire protection wall etc.). The evacuation plan will have also an effect on the design taking two different independent ways of transfer into account, e.g. by helicopter via landing platform, by vessel or steady-state life, free-fall lifeboats, etc. which all need to be incorporated into the structure. In general HSE issues are not part of the certification directly but it is obvious that these effects should be considered. Folie 8

9 Examples of positive Input due Certification (2-4) The verification as well as the design calculation will be issued according to the state-of-the-art. In Germany there are special requirement regarding to the design calculation of cyclic loaded geotechnical foundation elements. It shall be considered in an early stage of the project in which way these cyclic loads and the effect to the foundation elements (outer load-bearing capacity of the pile) will be calculated. This calculation and the required dynamic pile tests will be documented in later phase of the project in detail. The responsible German authority (BSH) for offshore wind farms permitted published a note of practice with regard to this topic: Anwendungshinweise für den Standard Konstruktive Ausführung von Offshore-Windenergieanlagen des BSH Geotechnische Sicherheitsnachweise für Gründungselemente It is part of the certification to advice the project owner/operator and those directly responsible for the design at an early stage of the project of these local requirements. Folie 9

10 Examples of positive Input due Certification (3-4) Special or critical details of the structure can be pointed out at an early stage of the project. Thus these can be taken into account in good time, avoiding later delay of the project. I. The design calculation of pile-driven flanges it is not state-of-the-art but a reasonable technical solution. The way of verification and the technical issues should be agreed in a timely manner between the project owner, the designer, the certification body and the responsible authorities. In general in this case complex FE calculations are required. Folie 10

11 Examples of positive Input due Certification (4-4) Special or critical details - 2 nd page with additional examples II. A similar procedure as explained for the pile-driven flanges is necessary for the design of grouted connection in the case that these connections have to bear high moment loads. III. Cranes and lifting equipment require special type approval to access in the offshore environment. IV. It should be discussed for future project if the wind loads at the top side of the substation will also have an effect at the fatigue calculation. It is in the scope of work of the accredited certification body to support the project regarding these topics. Folie 11

12 Summary of the Advantages of Certification The design of the substation will be according to the latest standards The substation will fulfil the requirement of the responsible permitting and authorities The current relevant standards and guidelines will be applied for the project Difficult details of the design will be identified at an early stage of the project. Thus later problems can be avoided, which could otherwise result in time delays A complete independent verification will be carried out by the certification process which is required for allot non technical issues The certification body is not the hypercritical part of the project, our role is to support offshore wind projects according to the state-of-the-art of all technical issues. Folie 12

13 End of Presentation There are major challenges to deal with Let us solve these challenges together Thank you for your attention! Folie 13