There are many stages of storage concerning crude oil as well as blended and intermediate products. There are also many factors affecting storage capacity. These include the method of crude oil reception, method of export, the extent of refinery complexity, etc. There are different methods for estimating storage capacity. Comparing these methods helps a refiner to choose the best one. Tanks may be cylindrical, spherical, or bullet-type. They may have internal or external floating roofs. This topic will discuss refinery products, daily refinery throughputs, stages of storage, factors affecting tank farm storage capacity, methods to estimate tank farm storage requirements, comparison of estimation methods, refinery tank farm storage patterns, safety issues, etc.