Is it necessary to use reducers at the inlet and outlet of ordinary centrifugal pumps?
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I’ve been working on a project recently, and I calculated that the pipe diameter should be relatively small. However, the project owner purchased a pump with inlet and outlet diameters that are larger than those of the pipes; it’s not possible for me to use reducers in this case. So I’m wondering if it’s possible to avoid using reducers and instead make the diameter of the inlet and outlet pipes equal to that of the pump
Without a diameter change, the pump is prone to cavitation
It is best to have a variable diameter; otherwise, cavitation may occur.
Import and export pipelines should not have necking; the pipe diameter can be reduced after the minimum flow line.
Small tubes and large pumps work fine for temporary use, but over time the pump is bound to break easily. Large pumps have high rated flow rates and currents; if the suction pipe is too small, it is difficult to draw in liquid, which can lead to gas formation and damage. If the outlet is too small or the outlet valve is closed too tightly, the pump will experience pressure buildup, overheat, and become prone to damage. If the owner absolutely refuses to agree to a replacement, then just leave it at that – if the pump breaks, he can deal with the pump manufacturer himself
A pump operating in this way certainly will not function properly: if the inlet pipeline is enlarged before it reaches the pump, cavitation is likely to occur, reducing the pump’s efficiency; if the outlet pipeline is enlarged, the valve opening will be very small, which can lead to wear on the valve and cause the pump to overheat.
Pump manufacturers generally require that the diameter of the pump inlet pipe be greater than or equal to the pump’s inlet diameter; otherwise, cavitation is likely to occur
Then I’ll make the inlet pipe equal to the pump’s inlet diameter, without using any reducer
It is recommended that you communicate more with the pump manufacturers.
Generally, diameter changes are required; the inlet diameter change is intended to increase the flow velocity, while the outlet diameter change is meant to increase the head pressure and reduce the flow velocity. What are the requirements according to the regulations?