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April 2019

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NI 572 update offers offshore FOWT guidance

In January 2019, Bureau Veritas released an update of NI 572, its Guidance Note for Classification and Certification of Floating Offshore Wind Turbines (FOWT). The Guidance Note details technical guidance for overcoming design challenges due to FOWT-specific technical and operational factors. It serves as a supplement to the Certification Scheme for Marine Renewable Energy Technologies (NI 631).

The Guidance Note responds to current industry demand, particularly in relation to wind farm pilot project certification and design evaluation certification. Examples of ongoing projects include Provence Grand Large and Les Eoliennes Flottantes du Golfe du Lion in the Mediterranean, as well as Groix & Belle-Île in the West Atlantic.  NI 572 also introduces detailed requirements in relation to corrosion protection.

The Guidance Note further clarifies design load cases for different operational conditions, while taking into account various elements (J-tubes, boat landing, hull, mooring system, towing foundation, partial structure during installation and maintenance, etc.). It also lays out the necessary technical requirements for floating offshore wind turbines, so they can meet design principles and stability needs.

Bureau Veritas is an active contributor to the International Electrotechnical Commission (IEC) Technical Committee (TC) 88, developing international standards for FOWT designs. NI 572 offers guidance to developers in line with internationally recognized IEC 61400 series standards.

aude.leblanc@bureauveritas.com

Shutterstock-Terje Aase
© Shutterstock-Terje Aase