The difference between maximum flow rate and rated flow rate when selecting a flow meter
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When selecting a flow meter, what is the relationship between the designed maximum flow rate and the calibrated flow rate?
The designed maximum flow rate is a parameter used by flow meter manufacturers when designing the meters, whereas the rated flow rate represents the upper limit of the range of the flow meter in actual use; it may be equal to the designed maximum flow rate or it may be less than it.
The maximum flow rate specified in the design is a theoretical value, and it is generally not achievable in practice. The maximum flow rate indicated on the scale is the highest flow rate that can actually be achieved, at which point the flow meter is able to display the corresponding value.
If the flow meter meets your requirements, its measurement range should be greater than the maximum flow rate specified in your pipeline design. I usually set the upper limit of the measurement range to 1.2 to 1.5 times the maximum designed flow rate for the pipeline, with 1.2 being the value I prefer to use.