What impact do pipe reducers, valves, and flow meters have on pipe flow velocity?
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For DN80 air supply pipelines, when installing flow meters or control valves (with a diameter of only DN40), it is necessary to use a DN80 to DN40 reduction fitting to connect the flow meter and the valve. I would appreciate some advice from experts: what impact does the installation of flow meters and control valves have on the pipeline flow rate, given a certain pressure drop in the pipeline? Is it determined by the narrowest part of the pipe for the flow rate? Thank you!
Is it necessary to use Bernoulli’s equation?
It depends on what type of flow meter it is; there are many requirements.
When changing the diameter, the installation specifications for the flow meter must be taken into consideration first
It is calculated based on the smallest diameter; valves of different diameters have varying flow capacities, and isn’t this information available in the selection manual?
When the system pressure remains constant and the resistance increases, the flow rate decreases.
The flow rate is the same throughout the entire pipe; it’s just that the velocity varies depending on the pipe diameter. The flow rate can be calculated using Bernoulli’s equation
It is determined based on the specifications of the flow meter you choose
The principle is Bernoulli’s equation, but isn’t there a way to make a preliminary estimate? After all, in chemical engineering such high precision isn’t always necessary.