API Std 650 carbon and low-alloy steel tanks overturning stability

A refrigerated tank may be a single-wall insulated tank or a double-wall tank that consists of an inner tank for storing the refrigerated liquid and an outer tank that encloses an insulation space (which usually has a lower gas pressure) around the inner tank. A double-wall tank is a composite tank, and the outer tank is not required to contain the product of the inner tank. In a double-wall tank, differences in API Standard 620 tank materials, design, and testing exist between the inner and outer tanks.

The API 650 specification provides guidelines for the API Std 650 carbon and low-alloy steel tanks design, manufacturing, materials, installation and inspection of welded vertical and cylindrical tanks. Such containers must be on the ground and have a closed or open top.

The foundation design of the API Std 650 carbon and low-alloy steel tanks should meet the requirements of foundation stability and deformation, that is, the API Std 650 carbon and low-alloy 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 Std 650 carbon and low-alloy steel tanks and cause distortion and deformation of the tank wall and bottom plate.