Hoppers & Silos
structure. The conical segments are foreseen with an overlap of 100 mm which allows quick alignment of the segments with absolute precision and without edges. The circumferential joint will be welded at the interior and exterior. The upper cone section is variable and will be adapted to the silo diameter and wall thickness.
A multitude of advantages results from this concept: Thanks to the efficient material utilization the wall thickness of the silo can be optimised.
The use of standard containers for transport reduces the freight charges.
The assembly operation is significantly accelerated. Local technicians may carry out the assembly without problems; only the automated full penetration welding is realized by Zeppelin.
transport. No specialist staff will be required for the assembly; the silos can be mounted quickly by the client's own personnel – or using low cost contract labour. If additional storage capacity is required subsequent extension or modification of the silo can be effected easily and quickly. Relocation of the silo is made equally simple as Bolt Tec silos can be disassembled and reinstalled again at another site. The use of containers instead of heavy low-load vehicles for transport offers planning reliability to the operators already in the project stage as the costs for transport and assembly can be calculated with far greater precision.
Optimum sealing
A patented joining and assembling technique is the core of the new design. Formerly silos assembled from prefabricated segments, relied on bolts, rivets or subsequent weld seams to absorb forces at the joints. Soft seals made from rubber, plastic materials or a weld seam had to ensure tightness. Now Zeppelin has developed a T-joint which guarantees optimum tightness of the silo. The pre-stressed silo sections are squeezed together so that the flange will not gape even in case of tensile load, i.e. the joint between the two section halves will always remain spanned. On the interior it is hardly possible to distinguish the bolted silo from a welded one and the same requirements of quality assurance, testing and certification are applicable. The first Bolt Tec silos have already been supplied to South America where they are successfully being used for the storage of PVC. Encouraged by this success the Zeppelin engineers pursued the next goal: to simplify the assembly of large silos with a capacity of more than 500 m³. The Panel Tec design which was presented for the first time at last year’s K show is based on the prefabricated silo – a method for the on-site construction of large welded silos up to now. The individual silo segments are manufactured in the Zeppelin workshop. Supplementary circumferential and longitudinal flanges are welded to the segments in order to facilitate and accelerate assembly at site. The maximum height of the individual silo segments is 2 m which allows transport to site in standard containers. The flanges are used to position the segments exactly to each other and to bolt them together so that they will form the basic silo body. For assembly the silo shell sections may be suspended from a crane either vertically or positioned horizontally. Due to technical and economic limits of the Bolt Tec concept the flanges and bolts of the Panel Tec Silo serve as a mere assembly aid. The joints are welded completely after the silo has been put into a horizontal position so that the weld seams will form the supporting
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The Zeppelin site manager will ensure assembly of the silos in accordance with Zeppelin quality. Crane costs can be decreased.
Last but not least the engineering costs will be reduced due to the fact that the silos are standardised. The Panel Tec Silo proves to be the economic design for silo capacities of 500 m³ or more and on newly developed sites where the installation of many silos is required. The first Panel Tec Silos are already utilized by major manufacturers and processors of polypropylene in Brazil, India and Thailand. For more information contact Zeppelin Systems on tel: +44 01623 753 291 or visit:
www.zeppelin-industry.com
To extract difficult materials, you’d better have the right teeth!
The HYDRASCREW® technology provides assured bulk silo discharge of diffi cult to fl ow materials. Available for fl at bottom silos ranging from 2 to 20m in diameter. Standard or tailor-made solutions according to your product.
STANDPRIME LIMITED (UK & Irish Distributors) Chelmsford, England Tél. : 01245 344700 Fax : 01245 354284 E-mail :
sales@standprime.co.uk Site internet :
www.standprime.co.uk ‹
http://www.standprime.co.uk›
March 2011 • Solids & Bulk Handling 43
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