Butadiene Storage Sphere in La Wantzenau, France

Customer Project

Structural Engineering Cedeti ingénierie
Hœrdt, France
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.

Seismic Analysis

The existing storage tanks have been subjected to seismic analysis 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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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RFEM Dynamic Analysis
RF-DYNAM Pro - Natural Vibrations  5.xx

Add-on Module

Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models

Price of First License
1,030.00 USD
RFEM Dynamic Analysis
RF-DYNAM Pro - Forced Vibrations 5.xx

Add-on Module

Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis

Price of First License
1,120.00 USD
RFEM Dynamic Analysis
RF-DYNAM Pro - Equivalent Loads 5.xx

Add-on Module

Seismic and static load analysis using the multi-modal response spectrum analysis

Price of First License
760.00 USD