Our society is heavily dependant on fuel to function and we use various types of fuel storage tanks. They vary in size and location with some being above ground and others being underground. The technologies for both types differ as well as the ratings on what they can store. Some fuels are more dangerous and corrosive than others and need to be stored carefully.
The design of fuel storage tanks hasn't changed much in the past 50 years aside from the occasional upgrade in materials or safety features. For all intents and purposes the average model is simply giant metal drum placed underground. These are most often used in the petrochemical industries and are designed for long term use. In addition to the tank there is a simple but effective system of pipes linking it to its parent factory.
Some fuel tanks have a special chemical coating or layer of resistant materials included in their construction. This is to help prevent corrosion from within and without. Over time corrosion will begin to damage a tank no matter how deep it is buried; and likewise corrosive materials can also rot a tank from inside if it's not properly treated.
Some companies may order a cheaper underground tank in an attempt to save money, even though all of them use the same basic design. This decision can lead to tremendous problems down the road, as corrosive substances eventually damage a fuel storage unit that was not designed to hold those substances. As a result of this damage, various chemicals can seep into and contaminate the local groundwater. Environmental protection groups will be highly displeased when this happens, and most reputable companies have strict rules in place to prevent it.
Above ground models are essentially the same design just on a much larger scale. Typically these models are designed vertically rather than horizontally but this is simply for ease of storage. Storing ten thousand gallons of fuel is easier to do when the storage area is wider than it is taller. This is the main reason that underground models are used so extensively. We simply don't have enough room to store everything above ground.
Fuel tanks play an essential part in our day to day life as well as the continuing development of society. If fuel storage was not possible we would always have an inadequate supply of essential chemicals and fuels. It is crucial for companies to keep in mind that cheaper fuel storage units may not hold up well over the years. Companies need to invest wisely, and whether fuel storage tanks are underground or above ground, safety precautions with regard to their usage are critically important.