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F The usual temperature range for API 620 tanks is -325 Deg. Temperature Range The usual temperature range for API-650 tanks is -40 Deg. API 620 tanks are Field Erected Tank Sizes Any Tank size larger than 300 ft. Shop/Field Erected These tanks can be Shop (Appendix J) or Field Erected.

API 620 tanks must have a single vertical axis of revolution. The Fertilizer Institute recommends that all liquid fertilizer tanks be inspected at least every 5 years.įor more information about above ground storage tanks such as liquid fertilizer tanks and others, feel free to leave a comment or question at the bottom.Parameter API 650 Tanks API 620 Tanks Description API 650 provides guidelines for Welded Steel Tanks for Oil Storage API 620 provides guidelines Design and Construction of Large, Low-Pressure Storage Tanks Configuration The configuration of API 650 tanks is Ground-Supported Bottom, Open or Closed Roof API 620 tanks can be of any configuration that has a single centered, vertical axis of revolution Configuration For API 650 tanks, the entire tank bottom has to be uniformly supported.

Various industries also have their recommendations for periodic inspections based on the fluid being stored. Most states require regular inspections of ASTs to ensure their integrity to safely hold the contents. API 650 also addresses how best a tank can be constructed to withstand natural conditions such as earthquakes and high winds.ĪPI 653 is the standard for the inspection and repair of ASTs as built to the API 650 standard. The API Specifications address the required thickness of each piece of steel based on the size of the tank being built as well as the welding requirements.

The main API specifications that are the recognized standard for large field-welded steel ASTs are API 650 for construction and API 653 for tank inspection.ĪPI 650 is the internally recognized standard for the construction and maintenance of AST units. Even if an above ground storage tank is not regulated by law, the American Petroleum Institute (API) provides standards that provide guidance as to sound engineering for the manufacturing, use, maintenance, and inspection of these tanks. Depending on the type of substance stored in the tank, ASTs may be regulated by the federal or state government.