A516 Gr 70 plates API standard 650 flat-bottom steel tanks

Inspection of weld and micro crack of API standard 650 flat-bottom steel tanks: the inner and outer surface of API standard 650 flat-bottom steel tanks, weld and heat affected zone shall be observed by naked eyes first. 100% ultrasonic testing or 100% penetrant testing are carried out for butt welds of API standard 650 flat-bottom steel tanks. For the defects found by 100% magnetic particle inspection, dye detection, 100% ultrasonic inspection or 100% penetrant inspection, the radiographic inspection shall be used again to ensure the accuracy of the test results.

Heat-affected zone impact specimens shall be taken across the weld and as near the surface of the material as is practicable. The API standard 650 flat-bottom steel tanks material specimens shall be of sufficient length to locate the notch in the heat-affected zone after etching. The notch shall be cut approximately normal to the material surface to include as much heat-affected zone material as possible in the resulting fracture. Impact test specimens shall be cooled to the temperature stated in Q.22.

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

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