API 650 mixed material tanks coating

The foundation design of the API 650 mixed material tanks should meet the requirements of foundation stability and deformation, that is, the API 650 mixed material 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 650 mixed material tanks and cause distortion and deformation of the tank wall and bottom plate.

Material for the outer tank API 650 mixed material tanks and for the roof that contains the vaporized liquefied gas but is primarily subjected to atmospheric temperatures may conform to one of the following:
a)Table 4-1 for design metal temperatures down to –35°F (lowest 1-day mean ambient temperature of–35°F) without impact test unless they are required by Table 4-1 or by the Purchaser.
b)Table R-3 for design metal temperatures down to –60°F without impact tests unless they are required by Table R-4 or by the Purchaser.

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API 650 is constructed from carbon steel, austenitic duplex stainless steel, and API 650 mixed material tanks aluminium A Welding Certification is stipulated by American Society of Mechanical Engineers (ASME), Section 10. There is a required inspection, no third party. The inspection cost is the cost of the NDE.