The maximum capacity of API standard 650 self-anchored flat-bottom tanks

Allowable Design Stresses
The maximum allowable design stresses for the API standard 650 self-anchored flat-bottom tanks materials outlined in Q.2.1 shall be in accordance with Table Q-3.The values for the allowable design tensile stress given in Table Q-3 for materials other than bolting steel are the lesser of (a) 331/3% of the specified minimum ultimate tensile strength for the material or (b) 662/3% of the specified minimum yield strength, but they are 75% of the specified minimum yield strength for the stainless steel, nickel alloy, and aluminum materials. Allowable test stresses are based on the limitation of API 620 oil tank storage standard Q.8.1.3.

API 650 storage tank stipulates that if the thickness of the lower wall panel obtained by calculating the anti-overturning moment is greater than the thickness of the API standard 650 self-anchored flat-bottom tanks hydrostatic pressure test (both do not include the corrosion allowance).

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The coating on the outer wall of API standard 650 self-anchored flat-bottom tanks can not only reflect light but also prevent corrosion. Different coatings for oil tanks have different reflective properties, and the reflective performance of coatings is expressed by reflection index. For example, the reflection index of white coating is 90.0, that of sky blue coating is 85.0, and that of light gray coating is 57.0. It can be seen that the white coating has good reflective performance, and coating the outer surface of API standard 650 self-anchored flat-bottom tanks with white coating can reduce the evaporation consumption of the oil tank.

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