API standard 650 self-anchored storage tanks preheating

Prevent the storage liquid from impacting the inner wall of the API 650 petroleum storage tank or increase the internal pressure, reduce the corrosion of the tank top and the tank wall, and extend the service life of the API standard 650 self-anchored storage tanks storage tank.

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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 self-anchored storage 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.