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

A silo is a large container used to store bulk materials, mainly used in the farming industry to store wheat, grain, and silage. The primary function of a wheat silo is to provide isolation and protection to improve the storage life of wheat and increase productivity.
Three types of silos are in widespread use today: tower silos, bunker silos, and bag silos.
Developing countries primarily need silos for storing food grains safely for long periods of time. They are designed to keep the grains safe from rodents, insects, moisture, fire,
 natural calamities like floods and earthquakes, wars, etc.