Why are diameter changes required at the inlet and outlet of centrifugal pumps?
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I see that reducing diameters are used at both the inlet and outlet of many centrifugal pumps – a reduced diameter at the inlet in the form of a flat transition, and a reduced diameter at the outlet as a concentric transition. What is the purpose of this?
The inlet pipeline of the centrifugal pump should be larger than the outlet pipeline
The inlet becomes smaller, the velocity head increases, while the pressure head decreases; as a result, the negative pressure difference within the pump is reduced, thereby minimizing cavitation. The outlet becomes larger, the velocity head decreases, and the pressure head increases, which reduces friction losses and increases the head pressure
The inlet becomes smaller, the velocity head increases, while the pressure head decreases; as a result, the negative pressure difference within the pump is reduced, thereby minimizing cavitation. The outlet becomes larger, the velocity head decreases, and the pressure head increases, which reduces friction losses and increases the head pressure
If the liquid level is below the pump inlet, the upper part of the eccentric elbow should be level when it is installed.
If the liquid level is below the pump inlet, the upper part of the eccentric elbow should be level when it is installed. Otherwise, air pockets will form in the upper part.