ASTM A524 pipe API Std 650 self-anchored tanks

Heat-affected zone impact specimens shall be taken across the weld and as near the surface of the material as is practicable. The API Std 650 self-anchored 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.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API Std 650 self-anchored tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.

The safety inspection of atmospheric storage tank, API Std 650 self-anchored tanks is divided into external inspection, internal and external inspection and comprehensive inspection. External inspection shall be conducted at least once a year, internal and external inspection shall be conducted at least once every three years, and comprehensive inspection shall be conducted at least once every six years. The safety inspection of large atmospheric storage tanks, API Std 650 self-anchored tanks requires special attention: the parts where the liquid level often fluctuates, the parts that are susceptible to corrosion, and the parts that are deformed and worn during use should be checked.