Regarding the issue of varying diameters at the inlet and outlet of the pump
Thread Content
Do the pump’s inlet and outlet necessarily need to have different diameters? Is the inlet diameter change intended to prevent cavitation? What about the exit? It is common to see at the site large-diameter inlet pipelines connected to small pump inlets – is this appropriate? Why?
The general principle for piping is to make the inlet piping of the pump as large as possible, as this reduces the flow resistance of the material and prevents the pump from cavitation. Specifically, the diameter of the pipe is determined based on the requirements of production: if it is too small, the material flow velocity becomes too high, leading to the generation of static electricity; if it is too large, it results in waste. The inlets and outlets of ordinary pumps generally require diameter reduction.
What was said upstairs is correct; to add something, using a larger-diameter pipe in combination with a smaller-diameter pipe is mainly to prevent insufficient suction volume by the pump. It’s necessary to take into account the pump’s delivery capacity as well as the fluidity of the medium!