API 650 aboveground steel oil storage tanks with a mat foundation

The API 650 is the American standard for welded flat-bottomed vertical API 650 aboveground steel oil storage tanks storage tanks. This standard dictates tank design, manufacture, welding, inspection and installation requirements.

API 650 aboveground steel oil storage tanks any joints between the adjacent sections of stiffening rings, as shown in Figure R-1, shall be made so that the required moment of inertia of the combined ring-shell section is provided. Weld joints between adjacent sections shall be made with full-thickness and full-penetration butt-welds. Stiffening-ring butt-welds may employ metal backing strips. Backing strips and the associated welding shall be made in a manner that provides a smooth contour in the rat hole and all other weld joints ends. All weld passes shall be started at the rat hole.

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