Some questions and doubts regarding volumetric flow rate
Thread Content
The gas flow meter installed in the device was designed for a pressure of 5 MPa, but it is now often used at pressures of 1 MPa or 2 MPa. The flow rate indicated by the meter is 400 cum/hr. I want to know whether the volumetric flow rate measured by this meter is affected by the pressure under different conditions, or whether the volumetric flow rate remains constant while the mass flow rate changes
Gases are generally measured in Nm3/hr; what does your cum/hr unit represent? m3/hr? If it is in m3/hr, without temperature and pressure compensation, it represents the actual operating conditions.
It shows the volume under actual operating conditions, so it’s a bit confusing. Is it necessary to make conversions for standard conditions? Or does every gas volume flow rate need to be converted into a volume flow rate under standard conditions before being displayed?
In the case of a rotameter, the readings are calibrated based on a medium with specific properties; the flow rate indicated is thus a standard volume flow rate, independent of the operating pressure. When the medium or composition changes, conversion is required; flow meters based on other principles need to be evaluated according to their respective measurement principles