1100 aluminum bar API standard 650 carbon steel tank

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

The refrigerated tank primary components shall also include those parts of a single-wall or an inner tank that are not in contact with the refrigerated liquid but are subject to the refrigerated temperature. Such API standard 650 carbon steel tank components include roof plates, roof manways and nozzles with their reinforcements, roof-supporting structural members, and shell stiffeners when the combined tensile and primary bending stresses in these components under design conditions are greater than 6000 lbf/in.2.

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 standard 650 carbon steel tank is permitted when additional requirements are met.