ASTM A234 pipe API standard 650 mechanically-anchored steel tanks

This standard establishes minimum requirements for API 650 tank material, API standard 650 mechanically-anchored steel tanks design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.

The foundation design of the API standard 650 mechanically-anchored steel tanks should meet the requirements of foundation stability and deformation, that is, the API standard 650 mechanically-anchored 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 standard 650 mechanically-anchored steel tanks and cause distortion and deformation of the tank wall and bottom plate.

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Proof Tests for Establishing Allowable Working PressuresBecause pressures in liquid storage tanks built according to these rules vary quite markedly from the tops to the bottoms of the tanks, proof testing of these tanks presents problems not usually encountered in the construction of unfired pressure vessels–especially where the API standard 650 mechanically-anchored steel tanks parts under investigation are located near the bottoms of the tanks. The principal difficulty is devising a test or series of tests that will reliably establish the working pressure that can be permitted on the part of the unproven design without, at the same time, imposing hazardous conditions on other parts located at higher levels in the tank.