Must the flow meter have a neck?
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At present, the flow meters used in our equipment are all of the reduced-bore type, but this also presents problems; the reduced bore leads to a decrease in flow rate, which affects the manufacturing process； Dear experts, please explain what kind of flowmeters require a neck reduction and which ones do not! ! !
Compare your normal flow rate with the pipe size; or when the pipe size is too large, in order to ensure measurement under full pipe conditions
This indicates that your pipeline has a large diameter but a low flow rate; without changing the diameter, no flow meter will likely work properly
If the pipeline is generally too small, should we not shrink it?
Basically, it depends on the type of flow meter and the range it can detect; if there is a significant difference between your flow rate and the detection range, there will be a bottleneck
When the flow velocity of the medium meets the minimum allowable flow velocity for the flow meter, a throat is not required.
Flow meter measurement requires a certain flow velocity, which is different from the flow velocity in the pipeline; generally, a constriction is needed
Using larger-diameter pipes reduces the overall resistance of the pipeline system; local components such as control valves and flow meters employ necking to increase the flow rate and facilitate control. As long as the flow rate and pressure drop within the pipes meet the required standards, it is not necessary to maintain a constant diameter
1 Flow rate is measured based on the principle of the relationship between fluid pressure difference and flow rate, or it can also be measured using dynamic pressure; therefore, devices that can generate a pressure difference or dynamic pressure need to be installed in the pipeline, and these devices generally alter the cross-sectional area. 2 When throttling, vortices are generated in the fluid; to reduce the impact of these vortices on measurement accuracy, tapered venturi tubes are often used. 3 Throttling inevitably increases resistance, but there is no inevitable connection between this resistance and whether it will affect fluid transport. Assuming there is an impact, the pressure upstream can be increased or other measures can be taken to enlarge the pipe diameter in order to reduce factors that cause increased resistance, thus ensuring the accuracy of flow measurement
You didn’t understand the original poster’s meaning at all in your answer!