Revision of DNV Design Standard for Offshore Wind Turbine Structures

2007 ◽  
Author(s):  
Jakob Wedel-Heinen ◽  
Knut O. Ronold ◽  
Peter Hauge Madsen
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wave Loads ◽  
Gas Industry ◽  
Standard Design ◽  
Practical Guidelines ◽  
Offshore Oil And Gas

The first DNV-OS-J101 standard “Design of Offshore Wind Turbine Structures” [1] was issued in June 2004. The standard represented a condensation of all relevant requirements in DNV standards for the offshore oil and gas industry which were considered relevant also for offshore wind turbine structures, supplemented by necessary adaptation to the wind turbine application. Det Norske Veritas (DNV) plans to issue the next revision of DNV-OS-J101 [2] in 2007. The DNV revised standard now implements the requirements of the coming IEC 61400-3 standard [11], which was presented as a committee draft in 2006. Numerous practical guidelines have been included to help designers of offshore wind turbine structures to develop cost optimal designs. The present paper summarises the proposed revisions of DNV-OS-J101 [2]. The most important revisions cover new formulations for design load cases, modified partial safety factors, exclusion of transformer platforms, more information on wave loads in shallow water and a revised chapter for design of concrete structures.

scholarly journals VERTICAL CAPACITY OF BUCKET FOUNDATIONS IN UNDRAINED SOIL

2014 ◽  
Vol 20 (3) ◽  
pp. 360-371 ◽  
Author(s):  
Amin Barari ◽  
Lars Bo Ibsen
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Field Tests ◽  
Oil And Gas Industry ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Vertical Load ◽  
Gas Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Offshore wind turbine structures are traditionally founded on gravity concrete foundations or mono-piles. Bucket foundations were developed for the offshore oil and gas industry and are now being used in wind turbine construction. The loading in this application is characterized by a vertical load due to the slender construction combined with horizontal forces inducing a large overturning moment. Field tests on bucket foundations were performed to gain insight into the vertical load response of bucket foundations in clay soils. The field tests were accompanied by finite element numerical simulations in order to provide a better understanding of the parameters influencing bucket foundation behaviour.

Revision of DNV GL Design Standard for Floating Wind Turbine Structures

2017 ◽  
Author(s):  
Anne Lene Haukanes Hopstad ◽  
Knut O. Ronold ◽  
Kimon Argyriadis
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Floating Structures ◽  
Current Trends ◽  
Floating Wind Turbine ◽  
Standard Design ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The first edition of the DNV Offshore Standard “Design of Floating Wind Turbine Structures”, DNV-OS-J103, was published in June 2013. The standard represented a condensation of all relevant requirements for floaters in existing DNV standards for the offshore oil and gas industry which were considered relevant also for offshore floating structures for support of wind turbines, supplemented by necessary adaptation to the wind turbine application. As part of the harmonization of the DNV GL codes for the wind turbine industry after the merger between Det Norske Veritas (DNV) and Germanischer Lloyd (GL) in the autumn of 2013, DNV GL currently plans to publish a revision of DNV-OS-J103 in 2017, to become identified as DNVGL-ST-0119. The new revision is intended to reflect the experience gained since 2013 as well as the current trends within the industry.

Efficient Offshore Wind Turbine Foundations

2005 ◽  
Vol 29 (5) ◽  
pp. 463-469 ◽  
Author(s):  
Anders Moller
Keyword(s):  
Wind Turbine ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Offshore Platforms ◽  
Gas Industry ◽  
Future Design

In the oil and gas industry, the foundations of offshore platforms have, for decades, used the grouted technique. This technology has now been transferred into the offshore wind turbine industry. This paper gives details of the use of the technology in some of the first offshore windfarms in Europe and considers future design possibilities.

Offshore Wind Turbine and Substructure Modelling for a Float Over Installation Design

2009 ◽  
Author(s):  
Jean-Marc Cholley ◽  
M. Cahay
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Farm ◽  
Oil And Gas ◽  
Cost Effective ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Heavy Lift ◽  
Offshore Oil And Gas ◽  
Turbine Installation

We can learn from the offshore oil and gas experience for the future offshore wind turbine installation. For the offshore ‘wind farm’ developments, the installation of wind turbines onto preinstalled foundations using the heavy lift vessel method or stabilized vessel is now well established, though, for large units, this requires multiple lifts and hence extensive offshore assembling. As demand for lift vessels increases, their availability to match a future large specific project’s schedule cannot be guaranteed. Consequently, an alternative wind turbine installation vessel design has been developed for not only installing simultaneously two wind turbines in a single piece, but also with a high air gap (up to 70 ft). This paper presents this new design. The new vessel design consists of a catamaran shaped vessel with dimensions that permit it to go around variety of substructures (piles foundation, tripod, concrete foundation or floating substructure) for float-over installation of wind turbines. For the float-over operation, a thorough understanding of dynamic behavior and environmental conditions are necessary to allow the design load to be assessed, with the objective to minimize the risk and maximize the operating sea states. This paper gives a description of how the substructure / Wind turbine / transition piece / floating unit can be modeled. This new vessel design greatly extends the geographical range for offshore wind turbine installation using the float-over method and offers a cost effective alternative to relying on crane vessels.

The Path to The Blue Economy - Lessons from the Oil and Gas Industry

2021 ◽  
Author(s):  
Roger I. Basu ◽  
Krish T. Sharman
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Offshore Wind ◽  
Gas Industry ◽  
Engineering Community ◽  
Innovative Methods ◽  
Blue Economy ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The importance of the blue economy is growing. A key element of this is the transition from fossil-based energy to greener alternatives such as offshore wind, marine renewables and other sources of energy. The ocean has been a source of food for millennia but newer, more innovative methods, of offshore cultivation are being developed and deployed. The engineering experience gained in offshore oil and gas industry is finding application in these examples of engineering for the blue economy. The trends are outlined together with the challenges faced by the engineering community.

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