The capacity of API 650 self-anchored flat-bottom steel tanks

The most popular standards for API 650 self-anchored flat-bottom steel 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 650 self-anchored flat-bottom steel 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 650 self-anchored flat-bottom steel tanks standards, the calculation results of tank wall thickness are sometimes quite different.

Except as permitted by API standard 620 Q.8.6, the test shall be conducted after the entire tank is complete, before the insulation is applied. Except as limited by foundation or stress conditions, the test shall consist of filling the tank with water to the design liquid level and applying an overload air pressure of 1.25 times the pressure for which the vapor space is designed. The load on the supporting foundation shall preferably not exceed the established allowable bearing value for the tank site. Where a thorough evaluation of the foundation justifies a temporary increase, the established allowable bearing may be increased for the test condition, but the increase shall be not more than 25%.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API 650 self-anchored flat-bottom steel tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.

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