Global Tank Leasing: Single-axle mobile FRAC tanks are available for the storage of various chemicals, wastewater and other liquid containment needs. FRAC tanks feature 500-barrel/21,000-gallon capacities with epoxy linings. All units have 22” dome lids at the front, side and top of the tank with 4” butterfly valves in the front and rear, making these storage tanks ideal for plant storage, pipeline projects and oil field applications.