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July 24, due to the "Cimarron" incident in Xiamen City, water scavenging operations had reached a final stage. However, unexpectedly, yesterday at 11 o'clock, a submersible pump "struck" and the water level began to rise again. At present, the exact cause of the pump failure is still under investigation by experts, who are conducting tests and diagnostics to identify the issue as soon as possible. Here’s a summary of common causes of submersible pump failures and their solutions for reference.
First, when a submersible pump experiences low flow or no water, it could be due to several factors:
(1) The pump is installed too high, leading to insufficient immersion depth and reduced pumping efficiency. Ensure proper installation height.
(2) The motor rotates in the wrong direction. Check the rotation before starting and adjust the phase sequence if needed.
(3) The outlet valve is not fully open. Regularly inspect and maintain the valve.
(4) The discharge pipe is clogged or the impeller is blocked. Clean the pipes and impeller, and remove debris from the reservoir.
(5) The wear ring at the bottom of the pump is worn or clogged. Clean or replace the ring.
(6) The fluid being pumped has excessive density or viscosity. Investigate the water quality changes and adjust accordingly.
(7) The impeller is loose or damaged. Secure or replace the impeller.
(8) Multiple pumps share the same pipeline without a check valve. Install or replace the check valve to prevent backflow.
If the pump vibrates abnormally or runs unstably, it may be caused by:
(1) Loose anchor bolts. Tighten all bolts securely.
(2) The outlet pipe lacks support, causing vibration. Install a solid support for the outlet pipe.
(3) The impeller is unbalanced, damaged, or improperly installed. Repair or replace the impeller.
(4) Bearings are damaged. Replace the upper and lower bearings.
Excessive current or motor overheating can result from:
(1) Voltage fluctuations. Check and adjust the power supply.
(2) Internal friction between moving parts or impeller and seal. Locate and fix the friction point.
(3) Low head with high flow, mismatching motor and pump performance. Adjust the valve to reduce flow.
(4) High-density or high-viscosity fluid. Monitor the fluid properties and adjust working conditions.
(5) Damaged bearings. Replace both ends of the motor bearings.
Low insulation resistance may be caused by:
(1) Water ingress due to damaged cables or signal lines. Replace cables and dry the motor.
(2) Worn or improperly installed mechanical seals. Replace the seals and dry the motor.
(3) Aging O-rings. Replace all seals and ensure proper drying.
Leakage at pipe joints often occurs due to:
(1) Defective pipelines that haven’t been pressure-tested. Repair or replace faulty sections.
(2) Poor gasket installation on flanges. Ensure proper sealing.
(3) Bolts not tightened correctly. Tighten bolts in a free state. Perform strength and leakage tests after installation.
Internal leakage can damage insulation, flood bearings, and trigger alarms, forcing the unit to stop. This is usually due to damaged dynamic (mechanical seal) or static (cable seal, O-ring) seals. Check the seal components before installation, ensure proper contact, and verify the motor's insulation and alarm system. If any fault occurs, replace all damaged seals and cables, and do not reuse them.
Lastly, during downtime, the pump may reverse due to faulty check valves or flaps. Before installation, ensure correct valve orientation and smooth operation. Regularly inspect and replace damaged parts to avoid such issues.
By understanding these common problems and their solutions, maintenance teams can respond more effectively and minimize downtime.
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