Selection of the vent pressure for the breathing valve
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According to \"Appendix to Oil Storage Tanks Part 1: Breather Valves SY/T 0511.1-2010\", breathers are classified into 5 grades; grade 3 covers a pressure range of -295~980 Pa, while grade 5 covers -295~1765 Pa. How should one choose between grade 3 and grade 5?
There’s no need to look at this; just make as many as you want and buy them from the manufacturer
Generally, the parameters of the breather valve are determined based on the design pressure of your storage tank; this is usually calculated by the design institute. For example, if the design pressure of a atmospheric storage tank is 3.5 Kpa, the vent valve is usually selected to be 2 or 2.5 Kpa ； The design pressure for low-pressure storage tanks is 10 KPa. The pressure values for vent valves are typically 6.5, 7, or 7.5 KPa. An EV valve for emergency release is also required, and its pressure setting should be between that of the vent valve and the design pressure