Pressure relief safety valve
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According to hg20570.2, the Mach number at the outlet of the safety valve discharge pipe for atmospheric release must be ≤ 0.5. Mach number is equal to the flow velocity divided by the speed of sound. Since the outlet is at atmospheric pressure, the flow velocity is calculated by dividing the discharge rate by the density at that atmospheric pressure, and then by the square of the radius. This flow rate depends only on the discharge volume, and the speed of sound remains constant. So the Mach number is only related to the leakage rate. I’m not sure if this is correct
The Mach number is related to the discharge volume and the diameter of the safety valve outlet; if the Mach number is high, the specifications of the safety valve should be increased
Furthermore, the speed of sound varies for different gases as well
Is it about limiting noise? ? ?