Technobins spiral silos are built directly on site with two types of technologies:

• Seamed (original LIPP technique)
• Welded (original SOCAMA technique)

From the static point of view, the two types are the same; the design is made according to DIN and EUROCODES and in compliance with ATEX and HACCP directives.

The inner wall is substantially SMOOTH ensuring there is no stagnation of the stored product. The cylinder is SEALED making the silo suitable for all types of product preservation. This flat bottom version is manufactured in diameters from 4 to 20 metres with capacity of up to 5,000 m3.

They are manufactured in high-strength galvanised Z350 steel sheet, with possible over-coating (for areas with a corrosive environment, e.g. the sea, or for aesthetic reasons and environmental impact), and stainless steel (only in the welded version).
The seam version is used almost exclusively for storing grain products (cereals in particular) whereas the welded version is also used for tanks (such as sewage and sludge digesters of biogas plants or tanks for slurry in the ceramic industry).
When the calculation requires it, reinforcing uprights are inserted, generally internally, using a technique that does not require holes, does not affect the galvanising and does not hinder the output flow of the product.

In the cereals sector, the silo is normally equipped with ventilation channels and rotating screw to ensure final cleaning of the bottom; the roof is normally pre-painted galvanised sheet metal and can be in a sealed version equipped with valved anti-condensation roof units for cold or inert gas storage.
For more information and comparisons with other types of grain silos, see “Selection guide”.