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Conference programme 

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Poster session

Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Giovanni Nappi DNV GL, Denmark
Giovanni Nappi (1) F P
(1) DNV GL Renewables Certification, Copenhagen, Denmark

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Presenter's biography

Biographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited

Giovanni Nappi is Senior Engineer at DNV GL Renewables Certification since 2010, managing type certification projects for several turbine models and component certification of, among others, blades and gearboxes.
In 2007 he attained a M.Sc. cum laude in Mechanical Engineering from the University of Perugia, Italy, and also took up a position as Structural Design Engineer at Siemens Wind Power in Denmark, responsible for Finite Element Analyses of mechanical and structural components for wind turbine hubs and nacelles.
His technical competence areas include design and testing of mechanical and structural components and methodologies for fatigue assessments.


Certification strategies for modular wind turbine components


Type certification projects for new offshore wind turbines can last up to three years. It is nevertheless possible to certify many wind turbine components separately and at an earlier stage of the turbine development process. On top of that, the same component certificate can be easily incorporated in more turbine type certificates. This allows turbine manufacturers to use already developed and certified components within several wind turbine models, thereby promoting truly modular wind turbine designs.


The work will provide an overview of the wind turbine components that can typically undergo a component certification process. Strategies for integrating component certificates into the overall turbine certificate will be presented and it will be shown how adopting this approach can in fact encourage the wind turbine industry to adopt a truly modular wind turbine design.

Main body of abstract

Component certification typically covers major wind turbine components, such as blades, gearboxes or towers. Nevertheless it is not unusual to see component certificates covering systems with less defined physical boundaries, such as lightning protection systems or condition monitoring systems.

Component certificates can be issued either to the component’s producer or to a wind turbine manufacturer, with no obligations of being bound to a particular turbine type.
As a result, the same certified component can be used several times, either on various turbine types from the same manufacturer or even from other manufacturers.

In the certification process of a component, the design, manufacturing and validation by testing, together with the technical data and characteristics, are verified for a particular set of design and functional criteria.
In order to successfully and consistently include the component certificate in a wind turbine type certificate, it is vital to define the interfaces covered by the component certificate and compare the design and functional criteria against the design and functional criteria of the destination wind turbine.

Provided that the turbine’s own design and functional criteria are compatible with the ones which the component has been certified for, including a certified component in a wind turbine type certificate is relatively straightforward.


By fostering component certification, manufacturers are able to tackle several design issues early in the design process, which in turn brings a benefic reduction of the turbine development, validation and certification costs, along with a shorter time-to-market for their products.
Finally, with component certification the technical and commercial risks inherently present in wind turbine certification processes can be split between a wider range of wind turbine industry players and more easily managed.
Component certification is therefore a great opportunity to develop completely modular wind turbine designs and shorten their time-to-market.

Learning objectives
Delegates attending to this presentation can expect to learn how component certification can support the development of modular wind turbines and what certification strategies can facilitate a smooth integration of these components in a wind turbine type certificate.