Features of Vertical Tanks : A fixed cylindrical roof tank can usually hold up to 20,000 liters of liquid To build a tank, the best material is used as liquid materials evaporate or spill out if the tank�s material is of low quality. To keep it damage-proof, the storage tank needs careful handling. Floating roof tanks have recently been embraced for emissions control by many industries. This kind of tank is special since the roof rises or falls depending on the level of the liquid.