Influencing factors and solutions for cavitation margin in high-efficiency and energy-saving multi-stage pumps

Category: Water pump knowledge

2025-06-30

In the operation of a high-efficiency energy-saving multi-stage pump, the net positive suction head (NPSH) is an important parameter. Its influencing factors and solutions directly affect the pump's performance and service life.

I. Influencing Factors:

1. Flow Rate and Velocity: Excessive flow velocity or flow rate can lead to gas accumulation within the pump, thus affecting NPSH.

2. Liquid Properties: The viscosity, surface tension, and other properties of the liquid can affect the solubility of gas in the liquid, thereby affecting NPSH.

3. Pump Design: The pump's structural design and impeller design can both affect NPSH. Unreasonable design can lead to gas retention within the pump, increasing the risk of cavitation.

4. Operating Conditions: Improper operation during pump startup, shutdown, or operation can also lead to changes in NPSH.

II. Solutions:

1. Optimized Design: Improve the pump's structural and impeller design to reduce gas retention within the pump and increase NPSH.

2. Control Flow Rate and Velocity: Reasonably control the pump's flow rate and velocity based on the liquid's properties and pump design to avoid gas accumulation caused by excessive speed or flow rate.

3. Improve Liquid Properties: Improve liquid properties by adding defoamers, changing liquid formulations, etc., to reduce the solubility of gas in the liquid and thus increase NPSH.

4. Operation and Maintenance: Correctly operate and maintain the pump, including proper startup, shutdown, and adjustments during operation, to reduce gas accumulation within the pump.

5. Install a Degassing Device: Installing a degassing device on the pump and regularly or automatically removing accumulated gas is also an effective method for increasing NPSH.

6. Monitoring and Warning System: Establish an NPSH monitoring and warning system to detect NPSH in real-time. Take immediate action if any abnormalities are detected to prevent cavitation damage.

In summary, the NPSH of a high-efficiency energy-saving multi-stage pump is key to ensuring normal operation and extending its service life. By understanding its influencing factors and adopting appropriate solutions, NPSH can be effectively improved, ensuring efficient pump operation. Reasonable operation and maintenance are also important measures for preventing cavitation.

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