Hoppers & Silos
A flexible approach Significant reduction of assembly costs and freight charges thanks to
modular construction
The common idea that silos are huge, rigid and awkwardly shaped can now to be dispelled. A new design allows easy transport of silos (even those having a capacity of more than 500 m³), accelerates their assembly and allows the realisation of new concepts.
The past was characterised by the continuously rising requirements of logistic services and consequently to silos. Regionally restricted markets had been adequately served by manufacture and assembly of silos in the workshop and subsequent transport to the client by heavy road vehicles. Normal manufacture had been limited to silo capacities and dimensions which were appropriate for transport because larger silos caused an enormous increase in freight charges. Typically road transport restricted the possibilities to a maximum silo diameter of 4.2 m and a length of 35 m.
For this reason Zeppelin Silos & Systems, the specialist in the construction of silos located at Friedrichshafen, developed prefabricated silos for site assembly as early as the mid 1960s. Manufacture of the silo was split into the prefabrication of silo parts and the assembly operations. Cutting, chamfering and rounding of plates as well as the preparation of segments and attachments were done in the workshop while assembly and final welding of the segments together was carried out at site. Only a little time later the Friedrichshafen enterprise optimised the general concept by the development of emboxable silos – sometimes called the “Russian Doll” approach. The
emboxable version is realized by dividing silos into two parts with a flanged connection. For
More than transport Intermodal supply chain solutions for powders & granules
+ Global coverage, cost effective & reduced C02
+ ISO-Veyors, featuring horizontal discharge for fine powders eg cement, ash & minerals
www.InterBulkGroup.com 42 Solids & Bulk Handling • March 2011 InterBulk GROUP
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+ Bag-in-Box containers for free flowing granules eg polymers, grain & sugar
transport the basic parts of several silos with slightly different
diameters (ΔD = approx. 50 mm) can be nested into each other enabling considerably reduced transport charges considerably. Based on the above designs Zeppelin has successfully met the global demand for any required silo capacity for decades. Since the 1990s international trade has again been subject to radical change with "time to market" and "just in time" becoming popular terms. Manufacturers now work much more closely with their suppliers. Companies which are active on the field of warehousing offer new services beyond managing stocks and sub-suppliers are paid depending on service quality. Business locations and product storage are rescheduled taking into account the wider market influences of their enterprises in the supply chain. Worldwide trading is constantly accelerating. Zeppelin has reacted early to these changes and invests in new production locations which have either good connections to important transport routes or are located directly at the place where the silos are required.
Benefits of the Bolt Tec design
Companies operating small and medium-sized silos (with a capacity of up to 500 m³) must also bear the increasing cost of transport especially as fuel costs continue to rise. In remote areas where the existing infrastructure is unfavourable, the technically demanding transport of heavy loads has nearly become unaffordable. It therefore became necessary to extend and expand the “easy transport and build” concept and, in collaboration with several research institutes, Zeppelin developed an innovative concept for bolting silos at site instead of welding. The patented modular construction of the Bolt Tec design results in low costs for transport, assembly and, thus, logistics. Standard containers can be used to transport the individual silo segments to site where they are simply bolted together. The freight charges for a 40' container are significantly lower than the costs which would normally be incurred for silo
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