API Std 650 welded steel oil storage tanks top-angle attachment for self-supporting roofs

Under the action of the earthquake, API 650 storage tank is mainly damaged by the phenomenon of the lower part of the API Std 650 welded steel oil storage tanks tank wall. Therefore, the key point of seismic calculation is to prevent the tank wall from buckling under axial pressure.

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The API Std 650 welded steel oil storage tanks outer wall shall be designed for the purging and operating pressure of the space between the inner and outer tank shells and for the loading from the insulation, the pressure of wind forces, and the roof loading.
The outer tank bottom, shell, and roof shall have a minimum nominal thickness of 3/16 in. (7.65 lbf/ft2) and shall conform to the material requirements of Q.2.3.