API 650 self-anchored tank shaping of shell plates

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The foundation design of the API 650 self-anchored tank should meet the requirements of foundation stability and deformation, that is, the API 650 self-anchored tank 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 650 self-anchored tank and cause distortion and deformation of the tank wall and bottom plate.

The design metal temperature of API 650 self-anchored tank 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.