API Std 650 ground-supported liquid storage tanks formulas

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

In this project, an elemental area of API 620 oil storage tank wall is constructed of ASTM A516 Grade 55 steel plate subjected to a meridional unit force, T1, of 2620 lbf/in. tension and a latitudinal unit force, T2, of 2880 lbf/in. compression. The meridional radius of curvature, R1, is 132 in., and the length of the normal from the surface to the axis of revolution, R2, is 409 in. The joints in the wall are spot-radiographed, double-welded butt joints, and no corrosion allowance is required.
The problem in this example is to graphically find the minimum thickness of tank wall required for the given conditions (see API 620 tank standard 5.10.3.3).
Solution: As determined from Table 5-1, the maximum, allowable tensile stress value, Sts, for ASTM A516 Grade 55 steel plate in simple tension is 16,500 lbf/in.2. Since the compressive stress is latitudinal, the governing value of R for this situation is R1, or 132 in.

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Storage tanks API Std 650 ground-supported liquid storage tanks designed in accordance with the rules and guidelines of API 650 are called API 650 storage tanks. API 650 is a control rule for welded storage tanks that work normally in the normal pressure range.