Flow rate
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Does it matter if the flow rate is too high or too low? If the pipe diameter is selected normally, then should an elbow with a size of 150 to 80 be used?
I originally wrote a lot, but never mind; it’s likely you wouldn’t understand it even if I wrote it. For example, take a good look at this row in the table by yourself – I think the table is well-made
The flow velocity in pipes: for gas phases, it is generally considered to be 8–10 m/s, while for liquid phases it is usually less than 1.5 m/s. For ordinary fluids, a higher flow velocity increases the driving force, which in turn leads to a greater pressure drop. In the case of flammable substances, high flow velocities can generate static electricity, posing a risk to safe operation. When the flow velocity is low, the pipes need to be larger, which increases the investment costs for pipes and related valves
The selection of flow rate depends on factors such as the medium and pressure drop; most media have recommended flow rates, especially hazardous media like toluene, which have upper limits on flow rate. As for the pressure drop, it is related to the choice of fluid transport equipment, so selecting the appropriate flow rate is indeed very important. The reason for choosing a reducing pipe may be to mark the boundary between the main pipe and the branch pipe, or it may be to increase the flow rate by restricting flow