How to test deck seams of API 650 self-anchored storage tanks

The welded API 650 tank in various sizes and capacities for internal pressures approximating atmospheric pressure (internal pressures not exceeding the weight of the roof plates), but a higher internal pressure API 650 self-anchored storage tanks is permitted when additional requirements are met.

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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 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.

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