Tank roof lng statoil (Norway) GROUPE ATEIM (DUNKERQUE) Route Express 59430 Fort Mardyck France Tel. +33 3 28 24 34 00 Fax +33 3 28 60 18 93 Email: [email protected] Contact: M. Ahcène Tikouirt Email: [email protected] Website: www.ateim.fr Since its creation in Dunkirk in 1969, the ATEIM group has continuously been expanding to become the leader in its activity in the North of France. It acts today as well at national as at international level. Originally specialised in steel and petroleum refineries industries, the group aims at spreading its activities to other industry branches such as metallurgy, chemistry, refining, automobile, rail and aircraft construction, food and pharmacy. Acquired experience, know-how and means allow the Group to offer a wide range of services in the fields of engineering, technical and products studies and communication. Located on the North Sea shores near Dunkuerque, first French sea port, midst a major trading area with direct links to the whole Europe. The ATEIM GROUP is situated: 40 Km from Calais, 45 Km from the Channel Tunnel, 100 Km from Lille-Lesquin Airport, 2 hours by TGV (high speed train) from the Roissy/Charles De Gaulle airport. Annual turnover: 30 000 000 euro Number of employees: 430 Areas of action: regional, national, international. Project technical data Diameter: 76m Height: 43m Mass: 600T Name of the project: Roof of LNG tank Place of construction: HAMMERFEST Norway Performed for STATOIL Architect: CMP ENTREPOSE Dunkirk Engineering and design department: ATEIM General Contractor: CMP ENTREPOSE - TRACTEBEL Group The studies are made in two parts and by finite elements method. The roof is modelled “as built” due to a dissymmetrical loading. The first study concerns the roof of the tank alone. The second study concerns the assembly of the elements. The elements are very flexible and required to be maintained by prestressed cables, a calculation of an element of the roof maintained by prestressed cables under its actual weight was made in order to ensure of the stability during the assembly. What makes this project interesting and significant? An “as built” modelling makes possible an optimization in the thickness of sheets, this means an economy that is appreciated by the customer. Why is it a special project? This project is very interesting, because it enabled us to gain roof proper weight and it is the first time that we propose to the customer this process of calculation in finite elements and assembly. The BA vault and snow loads are very significant, which required a checking in stability calculation. A calculation in second order was also necessary to take into account the initial deformations. Use of ESA-Prima Win Description of solved technical problems with ESA-Prima Win: In order to optimize the thickness of sheets and to ensure a good stability, a calculation in finite elements enabled us to locate the most critical zones of the hull. We studied a system of assembly and welding in order to reconstitute a homogeneous hull. The profit with regard to the steel weight is very substantial and as a consequence the customer is very satisfied. Description of your impression and experiment of the use of ESA PRIMA WIN in the realization of this project: A very convivial utilisation of the software. Modules used: Finite elements: hulls and plate in second order. Stability calculation - Critical loads. Object: This calculation note is aiming at verifying the steel elements part of the LNG container roof. The roof is the member located on top of the outer tank wall which is sealing off the content from the atmosphere (BS 7777 Part 1 § 3.2.11 definition) Its main function in service is to act as a gastight membrane and to form the roof vapour barrier. During the erection, before the concrete roof is being capable of carrying loads hanged to it, the steel roof has to sustain the suspended deck hanged to the framing (with live loads), cold boxes, monorails (with inner tank & liner erection loads) and concrete reinforcement with live loads associated. It is designed to act as a formwork for the concrete roof during the first phase of the pouring operation and to support its weight up to a sufficient hardening of the concrete. In case of concrete dome roof pouring in one layer, the steel roof is design to receive 144 Company Project Tank roof lng statoil (Norway) SCIA User Contest 2005 / Steel constructions 4 Categorie
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