How is the overpressure percentage for a storage tank’s breather valve determined?
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To prevent pressure changes inside the storage tank due to material inflow/outflow or temperature variations, a vent valve is generally installed. If the set pressure of the breathing valve is set to the design pressure of the tank, then how should the overpressure percentage be determined? I think it should be determined based on the test pressure of the storage tank. For GB150, the test pressure is 1.25 times the design pressure; therefore, the overpressure percentage of the relief valve should not exceed 25%. So how is the suction valve determined? I’m not very familiar with the requirements for vacuum tests… Could you please advise?
Generally, the operating pressure of a breathing valve shall not exceed the design pressure of the storage tank. The operating pressure of the breather valve is determined based on the design pressure of the storage tank and the allowable overpressure for the breather valve