Renewable Energy
One alternative to the concrete tank is to use carbon steel, which can be coated with glass linings or epoxy paint to prevent corrosion. Te tanks are made from rectangular panels that can either be welded or bolted together, however both of these systems can be prone to leakage and seal deterioration. Any sealant, gasket or fastener used in tank construction needs to be properly evaluated to ensure a long service life. Te positive aspects of the steel
construction are the reduced time for the build and the wide availability of suppliers and materials, making the market very competitive in terms of project costs. Te use of stainless steel to build storage tanks using the same construction methods as those for carbon steel has largely been ruled out on the basis of cost. However, the development of a hybrid material, Verinox, by Xaver Lipp in 1980, managed to combine the excellent corrosion resistance of stainless steel with the strength and cost effectiveness of galvanised steel. Tis was the first step in creating the innovative Lipp tank system.
Automated process Rather than bolting or welding small sections together, the Lipp Dual-Seam system uses an automated process to create a spiral tank from a roll of Verinox material. Tis combines an inner stainless steel skin, a boundary layer and a thicker structural outer steel layer. Te edges of the sheet are folded over twice with an integral sealing compound to produce a smooth internal surface and a gas tight seal. It is this internal surface that aids an efficient agitation process as required by AD. Te flexibility of this design allows material to be matched to the substrate and the construction can be completed in areas inaccessible to large cranes. Lipp has applied its knowledge of AD
to create more efficient processes and ultimately better gas yields from a variety of substrates. Development of the mixing tank included the creation of horizontal and vertical stirring systems, to account for the individual substrate characteristics. Te smooth internal surface of the tank combined with the most efficient height- width ratio, ensures an effective circulation with reduced energy consumption. l
For more information, visit
www.lipp-system.co.uk For more information ✔ at
www.engineerlive.com/ipe
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