API 650 tanks will support the whole bottom of the tank evenly in non-refrigerated service that have a maximum design temperature of 200 degrees Fahrenheit, whether the top is open or closed. There are minimum requirements for the design, material, construction, and testing for an API 650 storage tank. API 650 ConfigurationĪPI 650 tanks are typically smaller cylindrical storage tanks.
While they can store any liquid, the contents in an API 620 tank can store contents at a higher pressure and a lower temperature. API 620 Benefitsįor products that have a high internal pressure, such as liquified natural gas and cryogenic products, API 620 tanks are the industry standard. API 620 tanks must be field erected due to their size. API 620 tanks are usually larger than 300 feet in diameter. All API 620 tanks will need to be inspected and receive a welding certification. The tank will have a single, vertical central axis of revolution with a minimum material thickness of 3/16”. The tank is constructed from carbon steel, stainless steel, or nickel alloys (if storing at a lower temperature). Both models have their benefits, and choosing the right tank for your needs depends on a particular set of factors, including pressure, size, and temperature parameters.ĪPI 620 storage tanks will have an elevated or flat bottom. The American Petroleum Industry (API) has established standards for design, fabrication, and construction of these storage tanks. The most common steel storage tanks for storing oil, vapors, and other organic and non-organic liquids are the API 620 and 650.
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