API Std 650 petroleum storage tanks lap-welded bottom joints

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

When the API Std 650 petroleum storage tanks top shell course is the minimum thickness indicated in 5.10.4, Table 5-6 and Figure 5-6, details a – e, h and i, the minimum anchorage shall be designed for normal loads as specified by the Purchaser and by this standard. See 5.11.2.3 for the allowable stress. When the top shell course is thickened beyond the minimum thickness provided in Table 5-6 or as in Figure 5-6, details f and g, or a knuckle is used, the minimum anchorage shall be designed for three times the internal design pressure. The allowable stress for this loading is 90% of the minimum specified yield strength of anchorage material.

Standard API 650 tank calls for calculations based on the specific gravity of the liquid product being stored. This permits the thickness of the steel API Std 650 petroleum storage tanks needed as well as other specifications of how the tank is built to be determined by the weight of the API 650 tank.

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