Submersible sewage pumps are crucial equipment in wastewater treatment, municipal drainage, and industrial wastewater transportation systems. Operating under harsh water quality and complex conditions, they are susceptible to performance degradation or malfunctions due to fibers, silt, and corrosive substances. Scientific daily maintenance not only extends equipment lifespan but also significantly reduces the risk of sudden shutdowns and improves system reliability.
Maintenance should be based on regular inspections. It is recommended to inspect the pump body monthly or according to operating frequency, focusing on cracks, rust, or signs of leakage in the casing; ensuring cable joints are secure and undamaged; and verifying the sensitivity of the float or level sensor. For pump sets installed in environments prone to sedimentation, the inlet grille and flow channel should be inspected simultaneously, removing any entangled materials and deposited sludge to prevent increased inlet flow resistance that could lead to dry running or overload.
Lubrication and sealing maintenance are particularly critical. Submersible sewage pumps with mechanical seals or oil chambers require replacement or replenishment of the special lubricating oil (grease) according to the manufacturer's specified cycle. The sealing surfaces should be checked for leaks. If oil chamber emulsification or seal failure is found, the corresponding component should be replaced immediately to prevent sewage from seeping into the motor cavity, causing insulation degradation or even burnout. For static seals made of rubber or resin, attention should be paid to aging and cracking, and they should be replaced as needed.
Electrical system maintenance is crucial. The motor insulation resistance should be measured regularly to ensure it is above the specified value. The waterproof sealing performance of the junction box should be checked to prevent moisture intrusion and short circuits. For pump sets equipped with overheat or overcurrent protection devices, the protection parameters and operational reliability must be verified to ensure timely power cut-off under abnormal operating conditions. Before restarting equipment that has been out of service for a long time, a no-load test run should be performed to confirm that rotation, vibration, and noise are normal before connecting a load.
Cleaning and corrosion prevention measures should be tailored to local conditions. For pumps conveying highly corrosive wastewater, neutralization flushing can be performed during pump shutdowns, and a protective coating should be applied to the metal surfaces. In cold regions, antifreeze measures should be implemented to prevent water accumulation inside the pump from freezing and causing the casing or impeller to crack.
Furthermore, maintenance records should be established, detailing inspection data, maintenance procedures, and information on replaced parts. Trend analysis should be used to identify potential deterioration patterns and optimize maintenance cycles. Combining daily inspections, periodic maintenance, and condition monitoring forms a closed-loop management system, ensuring that submersible sewage pumps maintain efficient and stable operation under varying conditions, providing a solid guarantee for wastewater treatment and discharge systems.
