Pumps and machinery
Thread Content
Why do the inlet and outlet of a mechanical pump need to have different diameters?
It’s fine as long as it’s the same size as the pump’s inlet and outlet
The diameter of the process pipeline differs from that of the pump model, so a reduction fitting is required for connection. Pumps are cast, and their molds are not easy to change.
During design, comprehensive calculations are carried out for flow rate, velocity, pressure, etc. Theoretically, the flow velocity should not exceed 3 m/s. The inlet and outlet connections of the pump are relatively small; if no diameter reduction is applied, the flow velocity inside the pipes will usually exceed 3 m/s.