Pump diameter and pipeline
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This post was last edited by qq172424245 on 2020-3-5 at 16:53. Flow rate: 700 cubic meters, head: 30 meters. Pump diameter: inlet DN250, outlet DN200. How should the pipes on site be arranged? Is it the same as the pump diameter? Or can it be large or small? ?
The design institute advises you: the pump outlet pipe is generally one size larger than both the pump inlet and outlet pipes. In principle, the same level is best. However, to save costs, pump manufacturers usually reduce the diameter of the pump’s inlet and outlet. Generally, it is not common to see pump inlets and outlets being larger than the pipes. It is generally recommended that the increase in the diameter of the pump’s inlet and outlet should not exceed 2 stages. Otherwise, the pump inlet and outlet diameters should be increased.
The diameter of the inlet pipe must not be smaller than the pump’s inlet diameter
It has to be large, not small; otherwise cavitation is likely to occur
At least one size larger. In theory, it is not allowed to use small tubes with large pumps at the inlet, as this easily leads to cavitation. But I’ve encountered factories that do this: they call with sarcastic tones, claiming the pump isn’t working, and ask to replace the pipe on site. When told that it’s not possible to do so, that there are no conditions for such a replacement, it’s really unfair. I asked the group leader to give two cigarettes, and it was resolved on the same day. What else is there to say?
The operation manual for my pump states that the diameter of the inlet pipe should be at least two sizes larger than that of the pump’s inlet, in order to prevent insufficient material intake and the resulting cavitation.
Hehe, the rich people really go all out……