Experts invited in: Measurement of mass flow rate in large diameter oil and gas pipelines

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This post was last edited by hesonchang214 on 2021-3-29 10:25. I think this is a very meaningful question. The maximum size of a mass flow meter can only be 250mm. Therefore, for larger pipelines used for oil and gas transportation, the mass flow of fluids in large pipelines can only be measured by measuring volume flow and density. I have only asked about E+H density meters so far. The maximum size is only 1". The options that can be adopted are:: 1) Differential pressure volume flow meter + flow rate measuring volume flow meter 2) Volume flow meter + density meter 3) Flow meter + mass flow meter The strategies for 2) and 3) are to lead small pipes to the large main pipe respectively, install a density meter or mass flow meter on the small pipe to measure the density, and install a relatively high-precision volume flow meter on the main pipe to measure the volume flow. I don’t know if my analysis is correct. Please help me analyze it.