ISO 630 Gr E355 plates API 650 self-anchored flat-bottom tanks

For the welding of API 650 self-anchored flat-bottom tanks bottom, attention should be paid to the slag removal and drying of the welding joint before welding, and there is no sediment and oil contamination in the lap joint of steel plate. The manufacturing quality and production efficiency of the central plate can be obviously improved by adopting the rolling central plate. The butt joint is used between the rolling plates to improve the installation conditions of the central plate at the bottom of the API 650 self-anchored flat-bottom tanks. The welding sequence of the central plate is from the center of the central plate to the surrounding.

API 620 Tank Design
The designer of these large tanks API 650 self-anchored flat-bottom tanks shall supply the data on superimposed loadings to be assumed for the foundation design or, if there are no foundations, for direct loading on the subgrade. A slab or mat may be provided to support the superstructure and shall be considered to distribute the load more evenly over a lower natural subgrade compared with merely stripping, leveling, and rolling the existing grade.
For simple spheroids or tanks of similar design, in which the distribution of the imposed weights shifts because the liquid level in combination with the vapor pressure may change the shape of the tank, the designer shall consider the possibility of such a change.

Before pressure testing, thoroughly flush the API 650 tank floating roof primary drain hose system. Supply API 650 self-anchored flat-bottom tanks blind flanges, gaskets, and bolting (for other types of blanking covers as may be required) necessary for testing.

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