What Is The Difference between An Internal Floating Roof And An External Floating Roof? Storage tanks are essential components in oil, gas, and petrochemical industries, responsible for holding vast volumes of volatile liquids. These liquids—such as crude oil, gasoline, jet fuel, diesel, and various petrochemicals—must be stored in a manner that ensures safety, minimizes product loss, and remains compliant with stringent environmental regulations. Two predominant tank designs in use today are internal floating roof tanks (IFRTs) and external floating roof tanks (EFRTs). While both aim to reduce vapor emissions and improve safety, they differ significantly in structure, performance, and application.