66m diameter API 650 stainless steel storage tanks
Uplift on FoundationFor API Standard 620 tanks with an internal design pressure less than 1 lbf/in.2 gauge, the uplift shall be taken as the smaller of the maximum uplift values computed under the following conditions:a)The internal design pressure times 1.5 plus the design wind load on the shell and roof.b)The internal design pressure plus 0.25 lbf/in.2 gauge plus the design wind load on the shell and roof.
Before pressure testing, thoroughly flush the API 650 tank floating roof primary drain hose system. Supply API 650 stainless steel storage tanks blind flanges, gaskets, and bolting (for other types of blanking covers as may be required) necessary for testing.
When the day light gradually decreases, the temperature of oil in the API 650 stainless steel storage tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API 650 stainless steel storage tanks will also decrease. When the pressure in the API 650 stainless steel storage tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API 650 stainless steel storage tanks through the open vacuum valve, which is the "suction" process of the oil tank.