API 650 and API 653 are two of the most common standards associated with aboveground storage tanks. Because both are connected to API storage tanks, they are sometimes confused with each other.
An API storage tank is a large, welded storage tank designed and constructed in accordance with standards developed by the American Petroleum Institute (API).
API 650 is the industry standard for the design and construction of large, field-erected storage tanks that operate at atmospheric pressure or low internal pressures (not exceeding 2.5 psig). These tanks are essential for safely storing crude oil, petroleum products, water, chemicals, and other liquids across a wide range of industries.
