What to do when a high-flow, high-head multistage pump has difficulty starting?

2025-06-13

Regarding the issue of difficulty in starting large flow, high head, multi-stage pumps, this is a situation that may be encountered in actual operation. To address such issues, we need to deeply understand their causes and adopt corresponding solutions.

I. Reasons for Starting Difficulty

1. Electrical Issues: Unstable power supply voltage, phase loss operation, insufficient motor starting capacity, etc., can all lead to pump starting difficulties.

2. Pump Itself Issues: There may be foreign object blockage, bearing wear, seal damage, and other problems inside the pump, leading to inflexible rotation or excessive resistance.

3. Piping System Issues: High resistance in the inlet pipe, rusted foot valve, air inside the pipe, etc., can all affect the pump's start-up.

II. Solutions

1. Electrical Solutions:

Ensure stable power supply voltage and check if the power lines are intact.

Check if the motor starting capacity is sufficient; if there is a problem, a larger capacity motor needs to be replaced.

2. Solutions for the Pump Itself:

Clear foreign objects inside the pump to maintain smooth flow.

Check bearing wear; if wear is severe, replace it promptly.

Inspect seals; if damaged, replace them promptly.

3. Solutions for the Piping System:

Reduce inlet pipe resistance to ensure unimpeded flow.

Check if the foot valve is rusted; if necessary, replace it.

Ensure there is no air inside the pipe; air can be discharged through the vent valve.

III. Preventive Measures

1. Regularly inspect the electrical system to ensure stable voltage.

2. Regularly inspect the pump's operating status, including bearings, seals, etc.

3. Regularly inspect the piping system to ensure no blockages or leaks.

IV. Summary

The issue of difficulty in starting large flow, high head, multi-stage pumps needs to be investigated and resolved from three aspects: electrical, the pump itself, and the piping system. In actual operation, it is important to analyze the specific situation and adopt appropriate solutions. Additionally, regular maintenance and inspection can effectively prevent starting difficulties. We hope the above content helps you solve this problem and ensures the normal operation of the pump.

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