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

  A silo is a structure for storing bulk materials. Silos are used in agriculture 
  to store fermented feed known as silage, not to be confused with a grain bin, 
  which is used to store grains. Silos are commonly used for bulk storage of grain, 
  coal, cement, carbon black, woodchips, food products, and sawdust. Large steel
  silos can be used to store various agricultural, commercial and industrial products
  such as grains, cement, fly ash, and mineral materials, thus meeting the storage
  needs of most enterprises in modern society. Storage silos consume less storage 
  space compared to horizontal storage warehouses. The materials or products are
  stored under optimal conditions. Storage silos cost less compared to other storage 
  options.
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