Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Common Causes of Air Entering Multi-stage Pumps and Solutions

    Publication Date:

    2025-10-21

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    Users who rely on multi-stage pumps all know that, Centrifugal pump It cannot allow air to enter, and a multistage pump is precisely a multi-stage horizontal centrifugal pump—thus, it also cannot tolerate air ingress. Once air enters the pump body, cavitation will occur, damaging critical flow components such as the pump casing and impeller, leading to reduced operational efficiency and potentially triggering other malfunctions. Therefore, preventing air from entering a multistage pump is an essential aspect of daily use and maintenance. In this article, we, the manufacturer of multistage pumps, Changsha Zoomlion Pump Industry We will introduce the common causes of air entering multi-stage pumps and provide solutions for your reference.

     

    Multi-stage pump

     

    1. Pipeline design is unreasonable:

    If the piping is improperly designed, it may lead to insufficient pressure at the pump inlet, allowing air to easily enter. Particularly when the system is drawing in air, an improperly designed pipeline significantly increases the risk of air contamination.

     

    2. Poor sealing performance:

    The quality and installation of the seal are crucial for preventing air from entering. If the seal is severely worn or improperly installed, outside air can easily seep into the pump through the sealing area, disrupting its normal operation.

     

    3. Pump selection issues:

    In practical applications, if the selected multi-stage pump model does not match the actual operating conditions, it may result in insufficient suction capacity, thereby increasing the risk of air entering the system.

     

    4. Poor operating environment:

    In high-altitude areas or places with harsh climatic conditions, the risk of air entering the pump significantly increases due to changes in atmospheric pressure or the influence of ambient temperature. These factors can impair the pump's suction performance, leading to air entrainment.

     

    5. Improper operation:

    The operator's method of operation can also affect the pump's running condition. For instance, inexperienced handling during pump startup or failure to bleed air promptly may result in air being entrained within the pump.

     

    Measures to Address Air Ingress Issues in Multi-stage Pumps

     

    To address the above issue, the following specific measures can be taken to resolve the problem of air entering the multi-stage pump:

     

    1. Optimizing Pipeline Design:

    Ensure sufficient pressure at the pump inlet to minimize the risk of air entering. Design the pipeline layout reasonably, avoiding unnecessary bends and narrow sections, to enhance the pump's suction capability.

     

    2. Inspect and replace the seals:

    Regularly inspect the condition of seals, and promptly replace any that show significant wear. Ensure the seals are installed correctly to maintain optimal sealing performance.

     

    3. Make Rational Selections:

    When selecting a multistage pump, one should carefully consider the actual operating conditions, including factors such as flow rate, head, and medium characteristics, to choose the appropriate pump model and ensure its reliable suction capability and operational stability.

     

    4. Take protective measures:

    When using pumps in high-altitude or harsh environmental conditions, appropriate protective measures should be taken, such as installing a boosting device or adjusting the pump's installation height, to address changes in atmospheric pressure and temperature fluctuations.

     

    5. Enhance operational training:

    Provide professional training for operators to enhance their operational skills, ensuring the proper startup and venting of the pump. Develop detailed operating procedures and enforce them rigorously to minimize human error during operation.

     

    There are various reasons why air can enter multi-stage pumps, and it’s essential to analyze and assess the situation based on actual conditions. Only by identifying the root cause of the issue and implementing appropriate measures can we ensure the efficient operation and energy-saving performance of the multi-stage pump. By optimizing pipeline design, inspecting seals, selecting equipment wisely, adopting protective measures, and enhancing operator training, we can effectively address the problem of air ingress, extend the equipment's service life, and improve overall operational efficiency.

     

    If you have any questions about multi-stage pumps or need further assistance, please don’t hesitate to contact us: 15616442288 (WeChat with the same number)—we look forward to providing you with professional support and services.

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