How to select an air flow meter?
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How to select an air flow meter: The following conditions are known: Medium: compressed air, compressed nitrogen; Temperature: 0–35°C (same as the ambient temperature); Pressure: 0.6–0.4 Mpa; Pipe diameter: DN100; Flow rate: ? ? ? ? ? (I can’t calculate it.) How is this data volume determined? ?
To calculate the flow rate, it is necessary to know the pressure difference. The flow rate value used for selecting a flow meter is provided by the process; the instrumentation team can then select the appropriate meter based on this value. If the flow rate value is not known, one should consult the process team.
A orifice plate flow meter will do
It’s not you who determines the flow rate; it’s the actual amount of flow that exists. The pipe diameter should be determined based on the flow rate required by the flow meter. If the pipe diameter is too large, it can be reduced at the flow meter.
There are many things that can be measured: rotors, turbines, vortex flow meters, and more
Are there any requirements for the process? There’s also the actual amount of equipment usage, for which there should be data available.
The flow rate required for the process must be calculated based on actual needs. The general principles for calculation are to use the minimum flow rate, normal flow rate, and maximum flow rate as references, while also taking into account whether the pressure loss generated by the flow meter is within an acceptable range. To measure the flow rate of air or nitrogen, vortex flow meters or differential pressure flow meters (orifice plates, Venturi meters) can be used; the accuracy of these flow meters is generally between 1% and 2%. If a rotameter is used, the accuracy is usually between 2% and 4%.
For processes with defined flow requirements, vortex flow meters and orifice plate flow meters can be used; for low-flow applications, metal rotor flow meters are suitable.
The flow rate originates from production consumption, and can be estimated based on the amount of production consumption....