Should the reducer at the centrifugal pump outlet be made larger?
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Should the reducer at the centrifugal pump outlet be made larger? The flow diagram provided by the design institute shows that the pump outlet pipeline is DN40, but the pump purchased has an outlet of DN25. Is it necessary to install a reducing fitting at the pump outlet to change the diameter from DN25 to DN40? All pumps have this problem; whether it changes or not depends on the sizes of many pipes and valves. Besides cost, are there any other impacts?
Many operating conditions and media. The flow rate should not be too high.
As the pipe diameter increases, the flow velocity decreases, the pressure rises, and the losses decrease
The frictional loss along the export pipeline section is calculated based on DN40 (the flow velocity in the pipeline is set to the optimal value), and this directly affects the head required by the entire system； Thus affecting the selection of the water pump
What everyone upstairs said makes sense; the main consideration is pipe loss. It is usually bolded; designers determine the pipe diameter based on the design flow velocity and flow rate, and the calculated pipe diameter is always larger than that of the water pump outlet pipe.
Personal opinion: 1. The pump manufacturer has conducted calculations, and the outlet size of the pump meets the requirements of the operating conditions. 2. The design agency is responsible for determining the size of the outlet pipeline to ensure it meets the requirements of various operating conditions. 3. Due to differences in dimensions at the interface between the two, it is recommended that the design institute obtain the dimensional drawings from the pump manufacturer before designing the process pipeline; this will resolve the issue of diameter changes. If the drawings are prepared simultaneously, this kind of problem will arise. A diameter change should be incorporated, and the design institute needs to issue a revision
For design docking issues, diameter changes must be strictly avoided.
One is the flow rate issue, and the other is that the equipment inlet is larger than the pump inlet