Valve flow resistance calculation - flow velocity
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The customer has requested that the flow resistance of the butterfly valve be calculated. I plan to use the flow resistance coefficients provided in the manual, along with the flow velocity and density of the medium, to carry out the calculation. However, the details given in the image provided by the customer indicate an inlet pressure of 250 mbarg and a flow rate of 13,856 NM3/H. How can the flow velocity of the medium be determined in this case? Is the value of 13,856 NM3/H indeed the volumetric flow rate? If the flow velocity is calculated based on the valve diameter, it comes out to be 42 m/s, which is quite high. Does anyone know how to calculate it? . . .
This unit is liters per hour; what size is your valve? 42 is definitely too high
It should be converted to the operating flow rate before further calculation.
To perform the conversion, convert the volume at standard conditions to the volume at the operating pressure
If it is 13856 Nm/H and the temperature is -163°C, then the gas flow rate at a pressure of 250 mbarg (0.25 barg) is approximately 4482 m3/hr