In this video, we have shown practically the reasons of zero flow movement or loss of flow rate in a centrifugal pump due to removing of impeller key and impeller nut.
The impeller key is critical for operation of any centrifugal pump. It locks the impeller to the pump shaft, ensuring they are rotating together. If the impeller key is removed, several issues can occur which are as follows:
1. Zero Fluid Movement by Pump.
Without the impeller key, the impeller will detached with the shaft which can result impeller slipping or not rotating with shaft, leading to reduced or zero fluid movement.
2. Loss of Pump Performance.
Due to loss of connection between the shaft & impeller, it will drop pump efficiency. The pump will not produce required head, pressure, discharge or flow rate, rendering the pump ineffective.
3. Increased Erosion Effect (Wear and Tear).
Impeller will not rotate with regular movement so it will produce vibration, resulting erosion and can damage to both shaft & impeller at later stage. This can reduce utility life of pump components and increase maintenance costs.
4. Prone to sudden break down.
The loose impeller can cause mechanical failure suddenly al later stage. Pump housing allied components along with impeller will be damaged due to improper alignment, which can lead to costly repairs or complete failure of pump.
Keeping in view of above reasons, it is essential to ensure the impeller key is correctly installed and maintained. Regular inspections and maintenance checks should be performed to ensure that all components, including the impeller key, are secured and in good working condition.
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