These pumps are characterized by excellent anti-clogging performance, high efficiency, and resistance to cavitation and abrasion—qualities primarily ensured by the impeller and the volute casing. The WQ-series submersible sewage pump consists mainly of an asynchronous motor and a pump unit; it is widely used in agricultural irrigation/drainage and industrial water supply. Available types include dry-type, oil-immersed, and water-cooled models. Because the pump body operates while fully submerged for extended periods—often in harsh environments with poor power grid quality and limited maintenance expertise—it experiences relatively high failure rates and significant maintenance demands. Consequently, there is increasing interest in analyzing and resolving faults associated with WQ-series submersible sewage pumps.
1. Abnormal vibration or instability during operation | Fault Analysis:
(1) Pump base anchor bolts are loose or not tightened; (2) Discharge valve fails to open; (3) Wear ring at the lower end of the pump is severely worn or clogged with debris;
Solutions:
(1) Strictly control the allowable deviation for pump installation elevation; do not arbitrarily exceed limits; (2) Inspect and regularly maintain the valve; (3) Clear debris or replace the wear ring;
2. Low insulation resistance | Fault Analysis:
(1) Power cable ends submerged in water during installation, or water ingress due to damaged power/signal cables; (2) Mechanical seal worn or improperly installed; (3) O-ring aged and ineffective;
Solutions:
(1) Replace cable or signal wire; dry out the motor; (2) Replace upper and lower mechanical seals; dry out the motor; (3) Replace all sealing rings; dry out the motor;
3. Excessive current causing motor overload or overheating | Fault Analysis:
(1) Operating voltage too low or too high; (2) Internal friction between rotating and stationary parts, or friction between the impeller and sealing ring; (3) Motor power rating mismatched with pump characteristics due to low head and high flow rate;
Solutions:
(1) Check power supply voltage and adjust input voltage; (2) Identify the location of friction and rectify the fault; (3) Adjust the valve to reduce the flow rate, thereby matching the motor power to the pump.
Based on the analysis above, we can see that the most common issues encountered during the operation of WQ-series submersible sewage pumps include abnormal operation, low resistance, and motor overheating. Thanks to years of development and innovation, the WQ-series pump has become increasingly mature; it is hoped that, with further product improvements, these issues will eventually be eliminated. The future of the WQ-series submersible sewage pump relies on our collective attention and support.
Common Faults and Solutions for WQ-Series Submersible Sewage Pumps
Please Co., Ltd.