The maximum design liquid level of API standard 650 stainless and carbon steel tank

Natural ventilation loss: the main cause of natural ventilation loss is that the API standard 650 stainless and carbon steel tank is not tightly sealed. This is usually due to corrosion perforation on the top of the oil tank, or there is a height difference between the two orifices. The air tightness of the mixture in the API standard 650 stainless and carbon steel tank is higher than that of the air, which causes the mixture gas in the tank to be discharged into the atmosphere from the lower hole, and the external air flows into the tank from the high hole, resulting in natural ventilation loss.

Test plates shall be welded using the same qualified welding procedure and electrodes that are required for the tank shell plate joints. The API 620 steel storage tank test plates need not be welded as an extension of the tank shell joint but shall be welded in the required qualifying positions. One test weld shall be made on a set of plates from each specification and grade of API standard 650 stainless and carbon steel tank plate material, using a thickness that would qualify for all thicknesses in the shell. Each test welded of thickness t shall qualify for plate thicknesses from 2t down to t/2, but not less than 5/8 in. For plate thicknesses less than 5/8 in., a test weld shall be made for the thinnest shell plate to be welded; this test weld will qualify plate thicknesses from t up to 2t.

Welded steel API standard 650 stainless and carbon steel tank storage tanks that are designed, manufactured and installed on the ground are classified according to the API standard system. The three API standards API standard 650 stainless and carbon steel tank all adopt on-site production and installation of storage tanks.

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