Design requirements for API standard 650 SUG II tanks

Lateral braces between outer bay rafters must be provided if asymmetrical structural shapes are used for rafters and if the API standard 650 SUG II tanks API 650 tanks are located in areas subject to earthquakes. The bracing must be adequately sized for the seismic zone specified.

Usually, the soil resistance of the foundation should be considered before the design and construction of API standard 650 SUG II tanks. The soil endurance in the API standard 650 SUG II tanks construction area plays a decisive role in the basic cost of the tank. In areas with high soil resistance, not only the cost of foundation treatment can be greatly reduced, but also the ratio of height to diameter of storage tank can be obtained. Therefore, the investment cost of the API standard 650 SUG II tanks can be greatly saved in the area with large soil resistance.

Welding of API 620 Steel Storage Tank Primary Components
The following primary components shall be joined with double butt-welds that have complete penetration and complete fusion except as noted:
Longitudinal and circumferential shell joints and joints that connect the annular bottom plates together. When approved by API standard 650 SUG II tanks Purchaser, these may be welded from a single side provided temporary non-fusible backing is used with complete penetration and complete fusion. Both sides of the joint shall be 100% visually examined as specified in 7.15.5.

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