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 This document has been replaced by a standard (ST) in the DNV GL portfolio: DNVGL-ST-C All DNV GL service documents may be.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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DNV-OS-C502 – Detailed Design of Offshore Concrete Structures – Draft
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.
They can also support heavy topsides and be designed to store oil. Laboratory tests conducted by the material producer at an independent laboratory and witnessed by DNV Dnc are used to determine the fresh and hardened grout properties.
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 c520 the intended offshore application.
This is believed to be 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. Please sign in or become a member for free. 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.
Read the article online at: DNV GL believes that this type of certification scheme will facilitate the adoption of these materials by operators. 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. Later, in order to study the effects on vertical cables fixed to the sea bottom, a detailed analysis of the floating anchorage TLP Tension Leg Platform was carried out.
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.
In the early days of the industry when concrete platforms and installations started to be used, DNV GL experts verified such structures in Norway. TLP consists of a nearly fully 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. In addition, an audit of the manufacturing facility is undertaken with a focus on the quality control procedures in place for the product.
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 interaction. On this basis, a dv 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
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. Unlike steel structures, concrete structures are built locally and therefore fnv promote the local economy.
The analysis was based on the extreme environmental conditions of the site where it has been suggested to install the system. 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.
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. One of these materials is high-strength grout. This is now changing with the renewed interest in robust concrete structures for the Arctic environment and for liquefied natural gas LNG storage. First of all, the 2 tourist-receptive structures Hotel and bar-restaurant around the wind tower have been designed and checked.
Updated concrete standard Historically, operators used the former Norwegian concrete standards for offshore structures. This content is available to members only. 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.
No other standard currently available to the industry covers the whole lifecycle of a concrete offshore structure and provides detailed design guidance. In particular, submerged concrete does not perform as well as above-water concrete under fatigue loading. To address the current offshore concrete developments, DNV GL is now reviewing the Offshore Concrete Standard to provide updates and new guidance, particularly for harsh locations.
The purpose of the Eurocodes is to provide a harmonised set of design and construction rules that are applicable throughout Europe. However, the Eurocodes focus on onshore structures and this has to some extent resulted in important offshore experience being excluded.
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. Fixed concrete structures can provide continuous production and fewer shutdowns as they can withstand harsher weather. Concrete solutions are also being considered for projects north and east of Russia and north of Norway, amongst others.
Edited by Katie Woodward Read the article online at: In the polar extremes, concrete structures are durable and robust to resist collisions with icebergs and are resistant to abrasion from floating ice.
In this way, an economical contribution to the sustainability of the wind farm is possible.
OFFSHORE STANDARD DNV-OS-C, Offshore concrete structures, DET NORSKE VERITAS.
V502 changed in when Eurocodes were adopted throughout Europe, including in Norway. Edited by Katie Woodward. Historically, operators used the former Norwegian concrete standards for offshore structures.