API Std 650 cylindrical liquid-storage tank restrictions on stiffening rings

The effect of air pressure on the API Std 650 cylindrical liquid-storage tank tank walls of the API 650 tank must be considered when the design pressure is greater than 2 kPa.The fixed point method can be used to design the tank wall of atmospheric or micro internal pressure API Std 650 cylindrical liquid-storage tank storage tank.

In order to prevent the deformation of the bottom of metal vertical storage tank, API Std 650 cylindrical liquid-storage tank during welding, the number of welders should be reasonably distributed. When welding metal vertical API Std 650 cylindrical liquid-storage tank, personnel and welding position shall be reasonably allocated according to the actual situation of welding personnel, and random welding is not allowed.

The API 620 large storage tank nozzle neck is fabricated by welding from 1/2-in. plate. The materials in the tank wall, the nozzle neck, and the reinforcing pad conform to ASTM A442 Grade 55. The main joints in the tank wall are fully radiographed, double-welded butt joints. The longitudinal joint in the nozzle neck is of the same type API Std 650 cylindrical liquid-storage tank but is not radiographed; however, the longitudinal joint and all other parts of the nozzle-and-wall-plate assembly have been shop stress relieved after fabrication, as required by 5.25. The adequacy of the reinforcement and attachment welds shown in Figure F-6 shall be determined.

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