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    DNV launches improved standard for windfarm service vessels

    Publications // June 27, 2013

    DNV has launched what it describes as a significant revision to the rules for windfarm service vessels (WFSV).

    The announcement was made at the Seawork exhibition and forum which is taking place between 25 and 27 June in Southampton, UK.

    DNV was first to publish rules for WFSV in January 2011 to provide the windfarm industry with an improved construction standard which would be accepted by regulators in the North Sea Basin. These early tentative rules were well received by industry and they quickly became the industry standard for wind farm service vessels.

    "However, given the regulatory complexity and wide operating profile of the vessels we found that improvements were required in order to realise our vision of enhancing safety," said DNV. "We therefore established a cross industry rule development forum which provided us with very constructive and comprehensive feedback in a number of key areas." 

    DNV incorporated this industry feedback as well as the valuable experience we have gained from the large number of design approvals, newbuilding supervision projects and also the in-service inspections of the vessels classified by DNV into the new rule set which comes into force from 1st July 2013.

    In particular the DNV work on developing this new standard offers the following benefit for the industry:

    1) Rule requirements for equipment certification have been clarified reducing the build cost
    2) Key lessons from in-service inspections have been fed back into the rule development, for example added requirements to reduce cracking caused by the increased vibration in the aft end of the vessel when pushing up against turbines. This will reduce maintenance and repair cost for the owner.
    3) It provides an enhanced safety standard which local authorities and domestic associations can use as a benchmark thereby contributing further towards improved safety for the industry. 

    Thomas Grafton a Senior Engineer with DNV commented: “The original tentative rules met the expectations of the industry broadly however we realised that we needed to improve the clarity and accessibility of our rules further. The improvements we have made support further innovation leading to both lower through life cost and improved safety for these vessels.”
    Mårten Schei-Nilsson, Approval Engineer with DNV, added: “With the development of the wind energy industry, especially in European waters, there is a requirement for the vessels to go further afield and to transfer between jurisdictions such as Denmark, Germany and the UK. We have delivered a proven solution and will continue to support this industry as wind farms are constructed in other parts of the world and in increasingly challenging environments.”


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