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July 24, due to the "Cimarron" Xiamen City, water scavenging work had reached its final stage. Unexpectedly, yesterday at 11 o'clock, a submersible pump "struck," and water levels began to rise again. At present, the exact cause of the pump failure is still unknown. Experts are currently inspecting and debugging the system in hopes of identifying the issue as soon as possible. Xiaobian from Asian Fluid Network has summarized common causes of submersible pump failures and their solutions—let’s take a look.
First, common issues that lead to low flow or no water from the submersible pump include: (1) improper installation height, causing insufficient immersion of the impeller and reduced output. Ensure proper installation height and avoid over-expansion. (2) incorrect motor rotation direction. Before starting, run the motor idle to check the rotation and ensure it matches the pump's requirements. If not, check and adjust the power phase sequence. (3) the outlet valve is not open. Inspect and maintain the valve regularly. (4) blockage in the outlet pipe or impeller. Clean the pipe and remove any debris from the reservoir. (5) worn wear rings or blockage at the bottom of the pump. Clean or replace the wear ring. (6) high density or viscosity of the pumping fluid. Investigate water quality changes and adjust operating conditions accordingly. (7) damaged or loose impeller. Repair or replace it. (8) multiple pumps sharing the same pipeline without a check valve. Check for correct installation or replace the check valve.
When the submersible pump experiences abnormal vibration or instability, the main reasons may be: (1) loose anchor bolts on the pump base. Tighten all bolts. (2) lack of support on the outlet pipe, leading to vibration. Install an independent solid support for the outlet pipe. (3) imbalanced or damaged impeller. Repair or replace the impeller. (4) damaged bearings. Replace both upper and lower bearings.
Excessive current or overheating of the motor can occur due to: (1) unstable voltage. Check and adjust the power supply voltage. (2) internal friction between moving parts or impeller and seal. Locate and eliminate the friction point. (3) low head and mismatched motor power. Adjust the valve to reduce flow and match the motor with the pump. (4) high-density or high-viscosity fluid. Check water quality and adjust operating conditions. (5) bearing damage. Replace the motor’s end bearings.
Low insulation resistance in the submersible pump is usually caused by: (1) water ingress through damaged cables or signal lines. Replace the cable and dry the motor. (2) worn mechanical seals. Replace the upper and lower seals and dry the motor. (3) aging O-rings. Replace all seals and dry the motor.
Leakage at pipe connections is often due to: (1) flawed pipes not tested for pressure. Repair or replace defective sections. (2) improperly sealed flange gaskets. (3) uneven bolt tightening. Ensure proper alignment and tighten bolts correctly. All piping should undergo pressure and leakage tests before use.
Internal leakage in the submersible pump can lead to insulation damage, bearing flooding, and alarm activation. This is typically caused by damaged dynamic or static seals, such as mechanical seals or O-rings, allowing water to enter. Damaged cables or signal lines can also cause leaks. Alarm systems will trigger shutdowns based on flooding, humidity, or leakage. Before installation, check the quality of the seals and ensure proper contact. Also, verify the motor’s phase and ground insulation, and confirm that the alarm sensors are functional. If any faults occur during operation, replace all damaged components and dry the motor—never reuse old seals or cables.
Lastly, downtime reversal can occur when the pump motor reverses after a power outage, usually due to faulty check valves or flap doors. To prevent this, ensure the check valve is installed correctly, aligned properly, and operates smoothly. Regularly inspect and maintain the check valve or flap door, replacing any damaged parts promptly.
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