DCS flow display
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For gases such as hydrogen, if the flow rate is shown as 15000 Nm3/h, this value is already in standard conditions. If one wants to calculate the mass flow rate, then it is necessary to multiply by the density at standard conditions, right? Furthermore, if the actual hydrogen pressure (gauge pressure) is 2.0 Mpa, according to the ideal gas law, the actual density is nearly 20 times greater than that at standard conditions; in other words, the actual volumetric flow rate is 15000/20, which equals 750 m3/h. Is this understanding correct?
It’s 21 times, not 20; everything else is fine. If you want greater accuracy, use the virial equation for calculation