API Std 650 aboveground welded storage tanks roof and top-angle joints

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

Density of API Std 650 aboveground welded storage tanks Liquid Stored
The density of the liquid stored shall be its maximum density within the range of design temperatures, but no less than 29.3 lbf/ft3 for methane, 34.21 lbf/ft3 for ethane, and 35.5 lbf/ft3 for ethylene.
Design Metal Temperature
The design metal temperature of each component exposed to the liquid or vapor being stored shall be the lower of the temperatures specified as follows: The design metal temperature of the components of the API 620 single-wall tank or the inner tank of a double-wall tank shall be the minimum temperature to which the tank contents shall be refrigerated, including the effect of subcolony at reduced pressure.