API standard 650 cylindrical tanks ultrasonic examination

All edges of the inner wall of the API 650 petroleum storage tank to be lined or coated must be rounded and flat to a minimum radius of 3mm. The API standard 650 cylindrical tanks internal welding seam must be completely sealed welding, with a smooth surface and no air holes, air pockets and local protrusions. Remove welding spatter. As specified in API 650 petroleum storage tank design drawings, the seller must perform additional surface treatment.

When the day light gradually decreases, the temperature of oil in the API standard 650 cylindrical tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API standard 650 cylindrical tanks will also decrease. When the pressure in the API standard 650 cylindrical tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API standard 650 cylindrical tanks through the open vacuum valve, which is the "suction" process of the oil tank.

For all API 620 crude oil tank other materials, the impact test temperature shall be at least 30°F colder than the design metal temperature. Alternately, materials impact tested at the design metal temperature or lower with Charpy impact test energy value of 25 ft-lb (average), 20 ft-lb (minimum) are acceptable for design metal temperatures above –40°F. API standard 650 cylindrical tanks materials with an energy value of 30 ft-lb (average), 25 ft-lb (minimum) are acceptable for design metal temperatures of –40°F or lower.

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