Butadiene Storage Sphere in La Wantzenau, France
|Structural Engineering||Cedeti ingénierie
Number of Nodes: 3,636 | Surfaces: 634 | Finite Elements: 144,030
The production unit of the company ARLANXEO Emulsion Rubber France located in La Wantzenau, France, is one of the biggest producers of synthetic rubber NBR (nitrile butadiene rubber) in the world. Nitrile rubber is resistant to oil and is used for manufacturing cables, gaskets, hoses, brake pads and safety boots, among other things.
Butadiene is the essential element in the production of nitrile rubber. It is stored in a liquid state in storage spheres.
The existing storage tanks have been subjected to seismic design to comply with the French regulation ‘Classified Installations for the Protection of the Environment (ICPE)’. Initially, the spheres were designed according to the French seismic code PS92, using the site‑specific response spectrum.
However, Eurocode 8 and the Decree of 4 October 2010 have redefined the design spectrum, specifying the seismic rules for installations classified as involving risks. Therefore, a new analysis of the butadiene sphere was required.
Structure and Modeling
The storage sphere is supported by eleven steel columns welded around the envelope of the structure. The columns are interconnected by a bolted circumferential ring. Braces ensure an increased horizontal stability of the storage sphere in cases of wind and seismic loads.
A 3D model was created in the structural engineering software RFEM. All components were entered as surface elements (spherical envelope, columns, circumferential ring, braces, gusset plates, anchor plates, and other components).
The soil-structure interaction was taken into account by using elastic supports, transferring the stiffness of the deep foundations in each spatial direction.
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Seismic and static load analysis using the multi-modal response spectrum analysis