If the horizontal multistage centrifugal pump produces noise, then the possible reasons are as follows:
1. The deviation of the concentricity of the horizontal multistage centrifugal pump is too large, resulting in vibration, which produces noise.
2. The bearing of the horizontal multistage centrifugal pump is damaged, which leads to violent fluttering of the shaft, thus generating noise.
3. Horizontal multi-stage centrifugal pump produces cavitation, which generates noise when the air bubbles die out.
4. The pumping medium, due to solid particles, in high-speed operation, can also produce noise.