Ylindrical API standard 650 unanchored tanks

The liquid level of API 650 oil storage tank is covered by floating roof. The storage liquid of API 650 oil storage API standard 650 unanchored tanks tank is isolated from the air, reducing air pollution, fire and explosion hazards, and easy to ensure the quality of liquid storage. It is especially suitable for the API standard 650 unanchored tanks storage of high-grade gasoline, jet fuel and toxic and easily polluted liquid chemicals.

Uplift on Foundation
For API Standard 620 tanks with an internal design pressure less than 1 lbf/in.2 gauge, the uplift shall be taken as the smaller of the maximum uplift values computed under the following conditions:
a)The internal design pressure times 1.5 plus the design wind load on the shell and roof.
b)The internal design pressure plus 0.25 lbf/in.2 gauge plus the design wind load on the shell and roof.

The most popular standards for API standard 650 unanchored tanks are API Std 650, JIS B8501, BS2654, GB50341, etc. The formulas used in each standard are derived from the hoop stress calculation formula of membrane theory. Combined with the stress characteristics of API standard 650 unanchored tanks, plus the allowable stress, weld coefficient and additional wall thickness, the wall thickness calculation formula is complete. The allowable stress and weld coefficient are determined according to the material performance characteristics and construction technology level of each country. According to different API standard 650 unanchored tanks standards, the calculation results of tank wall thickness are sometimes quite different.

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