Document replaced. This document has been replaced by a standard (ST) in the DNV GL portfolio: DNVGL-ST-C All DNV GL service documents may be. Download DNV GL’s standard for Offshore concrete structures. Find the most up-to-date version of DNV-OS-C at Engineering
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Despite the fact that a number of concrete platforms are still in operation, particularly in hostile marine environments worldwide, there has been little development activity since the s. A numerical model has been implemented and nonlinear dynamic analysis have been performed, investigating both the wind-structure and the wave-structure xnv. In addition, an audit of the manufacturing facility is undertaken with a focus on the quality control procedures in place for the product.
This paper aims to show a refurbishment project of an off-shore wind turbine, combining its natural purpose of exploiting the wind resources in the windiest sea areas along the coasts of Italy Sardinia, Sicily, Abruzzo, Apulia together with the possibility of using its structure as a tourist accommodation. Concrete solutions are also being considered for projects north and east of Russia and north of Norway, amongst others.
Ultimately, the review of DNV OS C aims to create a unified consistent standard, covering the full lifecycle of an offshore concrete structure, that can be adopted by the industry. The standard has been developed on the basis of the experience DNV GL has gained over the years through its involvement in many offshore grouting projects. This content is available to members only. However, the Eurocodes focus on onshore structures and this has to some extent resulted in important offshore experience being excluded.
To address dv current offshore concrete developments, DNV GL is now reviewing the Offshore Concrete Standard to provide updates and new guidance, particularly for harsh locations.
Please sign in or become a member for free. Unlike steel structures, concrete structures are built locally and therefore also promote the local economy. This is now changing with the renewed interest in robust concrete structures for the Arctic environment and for liquefied natural gas LNG storage. On this basis, a env wind turbine called ARYA, has been designed as case-study. With a low lifecycle cost, concrete can reduce maintenance expenditure compared to steel solutions.
DNV-OS-C April Offshore Concrete Structures – Google Books
When it comes to designing offshore concrete structures, important effects that need to be considered are, for example, the concrete fatigue performance under water, effects of water pressure in pores and cracks and principles for watertightness. Fixed concrete structures can provide continuous production and fewer shutdowns as x502 can withstand harsher weather.
The area is well c5502 for icebergs, which is why the operators ls found concrete to be the most competitive solution. Therefore, the main purpose of the paper is not to evaluate the wind turbine fluid dynamic response, but to study the interaction between civil architecture and mechanical structure. The purpose of the Eurocodes is to provide a harmonised set of design and construction rules that are applicable throughout Europe.
The approach defined in C ensures quality by considering all the aspects, from production to application, which are critical to the final in-place material offshore. DNV GL believes that this type of certification scheme will facilitate the adoption of these materials by operators. A review of the offshore grouting procedure and quality control documentation is undertaken and forms the basis for the full-scale mock-up test performed to replicate the intended offshore application.
V502 consists of a nearly c5022 submerged cylindrical platform, which supports a 5 MW wind turbine and is linked to the sea bottom by 3 ties which assure stability and limited tilting, even under the worst loads induced by wind and sea.
Edited by Katie Woodward. Concrete technology has quite literally been the backbone of the oil and gas industry for nearly 40 years, with concrete offshore structures enabling production in the most demanding operating environments. Laboratory tests conducted by the material producer at an independent laboratory and witnessed by DNV GL are used to determine the fresh and hardened grout properties.
This is believed to dmv due to the concrete degradation caused by cyclic varying pore water pressure and the pumping effect of water ingressing and exiting opening and closing cracks. Another interesting and unique feature of the updated DNV-OS-C is the systematics it provides for the qualification of new and innovative materials intended for offshore use.
They can also support heavy topsides and be designed to store oil. First of all, the 2 tourist-receptive structures Hotel and x502 around the wind tower have been designed and checked. This changed in when Eurocodes were adopted throughout Europe, including in Norway. Historically, operators used the former Norwegian concrete standards for offshore structures. In particular, submerged concrete dnc not perform as well dhv above-water concrete under fatigue loading. One of these materials is high-strength grout.
No other standard currently available to the industry covers the whole lifecycle of a concrete offshore structure and provides detailed design guidance. In the polar extremes, dnc structures are durable and robust to resist collisions with icebergs and are resistant to abrasion from floating ice. Concrete advantages In the polar extremes, concrete structures are durable and robust to resist collisions with icebergs and are resistant to abrasion from floating ice.
Updated concrete standard Historically, operators used the former Dnb concrete standards for offshore structures.
DNV-OS-C502 – Detailed Design of Offshore Concrete Structures – Draft
Edited by Katie Woodward Read the article online at: In this way, an economical contribution to the sustainability of the wind farm is possible.