API standard 650 unanchored flat-bottom tank bleeder vents

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Usually, the soil resistance of the foundation should be considered before the design and construction of API standard 650 unanchored flat-bottom tank. The soil endurance in the API standard 650 unanchored flat-bottom tank 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 unanchored flat-bottom tank can be greatly saved in the area with large soil resistance.

All API standard 650 unanchored flat-bottom tank fillet welds shall consist of a minimum of two passes. The ends of the fillet welds shall be 2 in. from the rat hole, and these welds shall be deposited by starting 2 in. from the rat hole and welding away from the rat hole. An acceptable alternative to stopping fillet welds 2 in. short of the rat hole would be to weld continuously through the rat hole from one side of the stiffener to the opposite side. All craters in fillet welds shall be repaired by back welding.