140ft diameter API standard 650 self-anchored flat-bottom steel tanks

Selection of nominal diameter D of API 650 storage tank. In the design calculation of API 650 storage tank, the bottom plate thickness is the net plate thickness, that is, the actual thickness minus the corrosion allowance. In the design and calculation of API standard 650 self-anchored flat-bottom steel tanks wall thickness in hydrostatic test, the thickness of bottom plate is the total thickness of steel plate.

The design metal temperature of API standard 650 self-anchored flat-bottom steel tanks each component exposed to the liquid or vapor being stored shall be the lower of the following:
a)The minimum temperature to which the tank contents will be refrigerated, including the effect of subcooling at reduced pressure.
b)The minimum metal temperature anticipated when the atmospheric temperature is below the refrigerated temperature (see 4.2.1). The effectiveness of the insulation in keeping the metal temperature above the expected minimum atmospheric temperature shall be considered.

The foundation design of the API standard 650 self-anchored flat-bottom steel tanks should meet the requirements of foundation stability and deformation, that is, the API standard 650 self-anchored flat-bottom steel tanks foundation should not be crushed and the uneven settlement value of the foundation should be within the allowable range. The uneven settlement of the storage tank foundation should be specified in the design process of the safe allowable range, because excessive uneven settlement will reduce the safety of the API standard 650 self-anchored flat-bottom steel tanks and cause distortion and deformation of the tank wall and bottom plate.

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