What causes a high-flow, high-head multistage pump to always draw in air?

2025-06-23

High-flow, high-head multistage pumps occasionally experience air ingestion during operation. This phenomenon not only affects normal pump operation but can also lead to reduced efficiency and even equipment damage. So, what causes frequent air ingestion in multistage pumps?

I. Poor Pump Seal Performance

The sealing performance of a multistage pump is a key factor determining whether air is ingested. If the seals are aged, worn, or improperly selected, it can cause the pump body to communicate with the outside air, leading to air ingestion.

II. Improper Installation Location

The pump's installation location is also an important factor affecting air ingestion. If the pump is installed too high, resulting in insufficient inlet pressure, air is easily drawn in. In addition, an unreasonable inlet pipe design can also cause air ingestion.

III. Improper Operation

In actual operation, if the pump's start and stop operations are unstable, or if it is under high-load operation for a long time, it can cause large pressure fluctuations within the pump, thus creating conditions for air entry.

IV. Piping Issues

Loose pipe connections or unreasonable pipe design can also lead to air ingestion. For example, poor sealing at pipe joints or air accumulation in the pipes can cause air ingestion.

V. Other Reasons

In addition to the above reasons, environmental factors may also have an impact. For example, changes in ambient temperature can cause changes in the pump's sealing performance, leading to air ingestion. In addition, if the medium used by the pump contains gas, it may also cause gas to enter the pump.

In view of the above reasons, we can take the following measures to prevent air ingestion in multistage pumps:

1. Inspect and replace seals with poor sealing performance.

2. Adjust the pump's installation location and height to ensure sufficient inlet pressure.

3. Optimize the inlet pipe design to ensure tight pipe connections.

4. Strengthen operator training to ensure smooth operation.

5. Monitor and adjust environmental factors to ensure a stable operating environment for the pump.

In summary, the causes of air ingestion in high-flow, high-head multistage pumps are multifaceted and require analysis and resolution based on the specific situation. Only after identifying the specific cause can effective measures be taken to solve the problem and ensure normal pump operation and efficiency.

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