Grain storage silo tanks are used for storing grain in agriculture. They can be found in many different shapes and sizes. These silo tanks are made up of steel and have an outer shell which is covered by a plastic or fiberglass lining. The size of these silo tanks depends upon the capacity required by the user. There are two types of silo tanks available – open top and closed bottom. Open top silo tanks are more popular as they allow easy access to the grain inside them. Closed bottom silo tanks are useful when it comes to protecting the grain from insects and rodents.