When a multistage centrifugal pump generates obvious noise during operation, it will not only disturb the working environment, but also may be an early warning signal of equipment failure. Below, Lishengde Energy-Saving Pump Industry, a professional manufacturer of multistage centrifugal pumps, will combine actual working conditions to analyze in detail the8 common causes of such noise in multistage centrifugal pump bodies, helping users troubleshoot such faults.
1. Hydrodynamic Noise
During the operation of a multistage centrifugal pump, the fluid flowing inside the pump will form continuous pressure pulses. These pulses will cause vibrations in the pump body, pipelines, valves and other components. The vibrations then radiate noise to the outside through these components.
2. Mechanical Structural Noise
When the internal parts of a multistage centrifugal pump transmit pressure, the unbalanced motion state will cause collision and friction between components. The structural vibration caused by this process will produce audible noise.
3. Valve Disturbance Noise
Valves with throttling or pressure-limiting functions are one of the main sources of noise in pipeline systems. The irregular broadband noise generated by them can propagate over long distances along the pipeline. It may also excite the natural vibration of moving parts in valves or pipelines, and transmit the vibration to the pipeline surface through adjacent components, forming a tonal sound similar to metal collision.
4. Pipeline Transmission Noise
The noise generated by the multistage centrifugal pump body and valves will propagate along the pipeline in the form of vibration. It then radiates to the surrounding environment through the pipeline wall, forming pipeline noise.
5. Installation Concentricity Deviation
If the concentricity of a horizontal multistage centrifugal pump is improperly adjusted during installation and the deviation exceeds the allowable range, abnormal vibration will occur during operation, which will lead to noise.
6. Bearing Failure
When the bearings of a horizontal multistage centrifugal pump fail due to excessive wear, fragmentation or other problems, the shaft will produce violent axial movement. The shaft will then rub and collide with other components, resulting in obvious noise.
7. Noise Caused by Cavitation
When cavitation occurs in a multistage centrifugal pump, the bubbles formed in the fluid will burst instantaneously in the high-pressure area. The energy released during this process will produce impact noise, which is a relatively common cause of noise during pump operation.
8. Medium Containing Impurity Particles
If the conveyed medium contains solid particles, these particles will collide and rub against the internal parts of the pump under the action of the high-speed rotating impeller, thus generating continuous noise.
Mastering these causes of noise is helpful for targeted troubleshooting of noise problems in horizontal multistage centrifugal pumps during actual operation. Timely countermeasures can be taken to reduce noise and ensure the stable and efficient operation of the equipment.