API standard 650 aboveground welded storage tanks seismic design factors
The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API standard 650 aboveground welded storage tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.
When as-rolled plate material complies with impact test requirements as specified here, the material need not be normalized. If, as with ASTM A516, the specification prohibits impact test without normalizing but otherwise permits as-rolled plates, the API 620 welded storage tanks material may be ordered in accordance with the above provision and identified as “MOD” for this API modification.
For the welding of API standard 650 aboveground welded storage tanks bottom, attention should be paid to the slag removal and drying of the welding joint before welding, and there is no sediment and oil contamination in the lap joint of steel plate. The manufacturing quality and production efficiency of the central plate can be obviously improved by adopting the rolling central plate. The butt joint is used between the rolling plates to improve the installation conditions of the central plate at the bottom of the API standard 650 aboveground welded storage tanks. The welding sequence of the central plate is from the center of the central plate to the surrounding.
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