brochure wind turbin.indd tcm109-431803

8/3/2019 Brochure Wind Turbin.indd Tcm109-431803

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Classification of

wind turbine installation vessels

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Ever since it was established in 1864,

DNV has been recognised as a leading

classification society for the commer-

cial shipping industry and over the past four

decades it has expanded into the oil & gas

industry through classification and verifica-

tion of mobile offshore units and fixed

offshore installations. Today, more than

220 mobile offshore units and 5,500 shipsare classified by DNV. As the fleet is spread

around the world, DNV has established a

global network of resources and service

centres to accommodate the needs of its

customers, with each local office having

special knowledge of the business in the

region, its conditions and governing regu-

lations.

MOVING INTO THE OFFSHORE RENEWABLE ENERGY MARKET

For the rapidly expanding offshore wind energy market, DNV is combining its expertise in

certifying onshore wind turbines with best practices and rules for offshore and maritime

classification. New installation vessels that are designed and built in accordance with DNV’s

rules for wind turbine installation units may be given the service notation “Wind Turbine

Installation Unit”, which identifies that the vessel is purpose-built for this industry. By

combining this with other class notations, the vessels may be prepared for various serv-

ices within both the renewable energy and offshore markets.

DNV uses offshore or maritime rules to classify the vessels, depending on the way inwhich the vessels are planned to operate; either by transporting wind power equipment

from land and installing it at the site without support from other vessels or by more

stationary operations at the site with the assistance of additional feeder and/or support

vessels. The planned mode of operation will determine which class rules to use and which

certificates are required by flag states. DNV can draw on its broad experience to help

clarify the needs of each project.

PRE-CLASS SERVICES FOR NEW CONCEPTS:In the current drive to develop offshore wind parks, various vessel designs have been

suggested for the cost-efficient installation of wind turbine equipment. Typical installa-

tion vessels are self-elevating crane units with three, four or six legs and floating mono-

hulls or submersible-type designs.

DNV OFFSHORE CLASSIFICATION

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DNV offers the following early phase consultancy and verification services to the industry:

■ Approval in Principle (AiP):

A review of the design basis and general arrangement drawings covering machinery systems,

safety principles and simplified structural strength calculations with the purpose of evalu-

ating whether the concepts meet the overall safety and structural strength requirements.

The AiP is normally carried out at an early stage in the project development and represents

a first check against DNV Offshore Standards and flag state requirements.

■ Main Scantling Approval (MSA):Approval of main scantling drawings with respect to nominal plate thickness, stiffener

and girder dimensions and grade of material, supported by independent analyses of

global and local strength to verify the designer’s calculations. The completed MSA by

DNV is considered sufficient for ordering most of the steel material for the new build.

■ Approval of Basic Design Package

Approval of the Basic Design Package by combining the MSA and the AiP is considered

a good starting point for the owner and yard to agree on the detailed design and the

new building contract for the vessel.

DNV CLASSIFICATION SERVICES FOR NEW BUILD VESSELS:

DNV’s classification services for Wind Turbine Installation Units take a risk-based approachto defining the right level of review and inspection involvement during the design and

construction phase. The verification work thus focuses on design and production aspects

that are known to be critical to the vessel’s overall safety, thus giving the owner/designer

the maximum benefit of the classification work.

SERVICE NOTATION “WIND TURBINE

INSTALLATION UNIT”

DNV has developed specific technical

requirements for Wind Turbine Installation

vessels that take into consideration these

vessels’ specific design and operational

aspects, such as:

■ Limited operating conditions to avoid

damage to the equipment during liftingand installation.

■ Limited transportation conditions to avoid

damage to the equipment during trans-

portation to the installation site.

■ Frequent vessel moves and jacking

operations due to continuous repeated

installations.

The basic requirements and further rule

references are given in DNV-OSS-101 Rules

for the Classification of Offshore Drilling

and Support Units.

To ensure that new designs are built to

meet the primary operational and design

challenges in accordance with classifica-

tion rules and flag state requirements,

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DNV (Det Norske Veritas)

NO-1322 Høvik

Tel: +47 67 57 99 00

www.dnv.com

DENMARK

Copenhagen

Tuborg Parkvej 8, 2nd Floor

DK-2900 Hellerup

Denmark

Tel: +45 39 45 48 00

USA

Houston

1400 Ravello Drive

Katy, Texas 77449

USA

Tel: +1 281 396 1000

GERMANY

Hamburg

Bei den Mühren 1

20457 Hamburg

Germany

Tel: +49 40 890 5900

REPUBLIC OF KOREA

Busan8th floor, Kolon Building 36-7

Namchon 1-dong, Suyong-Gu

Nampusan PO Box 120

Pusan 613011

Korea

Tel: +82 51 610 7700

UNITED KINGDOM

London

Palace House

3 Cathedral Street

London SE19DE

United Kingdom

Tel: +44 (0) 20 7357 6080

CHINA

Shanghai

House No. 9

1591 Hong Qiao Road

Shanghai 200336

China

Tel: +86 21 3208 4518

SINGAPORE

DNV Technology Centre

10 Science Park Drive

Singapore 118224

Tel: +65 6508 3750

THE NETHERLANDS

Rotterdam

Zwolseweg 12994 LB Barendrecht

Rotterdam

Netherlands

Tel: +31 10 2922 866

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