bolted silo design in UK

   https://3d-labs.com/bolted-storage-tank/

   Bolted silos are mainly used to store large quantities of various bulk materials ,
   in particular gravel, hardcore, chippings, and non-metallic minerals.
   The silos are manufactured with standard diameters of 4,647 mm – 12,000 mm. 
   Cone inclinations of 45°, 55°, and 60° are available. Bolted silos are mainly used
   to store large quantities of various bulk materials, in particular gravel, hardcore,
   chippings, and non-metallic minerals. The silos are manufactured with standard
   diameters of 4,647 mm – 12,000 mm.
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