I would appreciate your advice regarding the metering issues with nozzle flowmeters.
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The medium is steam, at a temperature of 220 degrees and a pressure of 1.1 MPA. The current specification for the Supervisor is DN800, with a flow rate range of 25–250 T/H. I plan to use a nozzle flow meter. Given the wide range of flow rates, I intend to measure the flow in separate branches; what would be an appropriate diameter for these branches? Are there any methods to determine the diameter of a flow meter? Please give me some advice.
The standard classifications are as follows: DN300, 25–80, DP=50KPA, β=0.623; DN500, 80–250, DP=50KPA, β=0.69. What about further research into how to achieve flow diversion? With a hand valve or a control valve? Because the flow rate will not “automatically match” the flow meter you want. It would be best to study further those traffic flows with the longest operation times, so that the pipe dimensions can be chosen more appropriately. If the process is such that normal operation lasts 40–60, while start-up and shutdown take 200, then the options mentioned above are feasible. The flow diversion size can also be designed in such a way that there is a pressure difference of 2/3 KPA at normal pressure for the minimum flow rate; this prevents issues with the differential pressure transmitter, and the Reynolds number meets the required standards. There is no need to stick to a flow rate range of 3:1.