Calculate the thickness and material for the selected roof type. Select the type of roof: API 650 allows for various types of roofs, such as fixed cone roofs, floating roofs, and external floating roofs. Shell courses: Divide the height of the tank into multiple shell courses, with each course having a specific thickness. Shell thickness: Calculate the minimum required shell thickness, taking into account the specific gravity of the stored liquid, the hydrostatic pressure, and other factors. Height (H): Calculate the tank height based on the volume and diameter, using the formula V = π(D/2)^2 * H. Diameter (D): API 650 requires the diameter of the tank to be greater than 30 feet (9.144 meters). 
Volume (V): The volume of the tank is based on the desired storage capacity (usually given in barrels or cubic meters).
To design an oil storage tank based on API 650, you will need to consider the following steps: This standard covers tanks with a diameter greater than 30 feet (9.144 meters) and capacities up to 500,000 barrels (79,500 cubic meters). API 650 is a standard developed by the American Petroleum Institute (API) for the design, fabrication, erection, and inspection of welded steel oil storage tanks.
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