A131 Gr B plates API Std 650 closed top welded storage tanks

The API 650 is the American standard for welded flat-bottomed vertical API Std 650 closed top welded storage tanks storage tanks. This standard dictates tank design, manufacture, welding, inspection and installation requirements.

Design of Compression-ring Regions
In this project, a cylindrical tank 30 ft in diameter is designed for an internal pressure of 5 lbf/in.2 gauge in the vapor space. The plate material is ASTM A131 Grade A steel for thicknesses of 1/2 in. and less. The top course of the butt- welded cylindrical sidewall is 1/4 in. thick, including a 1/16 in. corrosion allowance. The tank API Std 650 closed top welded storage tanks roof is a butt-welded spherical dome with an internal radius of 30 ft and a thickness of 1/4 in., including a 1/16 in. corrosion allowance. The maximum design liquid level is 6 in. below the plane of the juncture of the roof and sidewall.

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

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