Operation and Common Problems of Sewage Pump
2025-09-12
Operation and Common Problems of Sewage Pump
Operation and Common Problems of Sewage Pump
A sewage water pump is a type of pump used to treat wastewater containing solid particles, fibers, or other impurities. They play a crucial role in various scenarios, but proper use and maintenance are key to ensuring their efficient operation.
Operation mode of sewage pumps
The operation of sewage pumps usually involves the following key steps：
Installation preparation
- Inspection: Before installation, carefully inspect the appearance of the sewage pump for damage and ensure that the power cord is intact.
- Connection: Fix the pump in the predetermined position according to its type (submersible or non submersible). Submersible sewage pumps need to be placed in the liquid to be pumped and ensured to be stable. Non submersible sewage pumps require connecting the inlet and outlet pipes.
- Exhaust: For certain types of sewage pumps, especially suction pumps, exhaust is required before starting. This usually involves opening the exhaust valve and filling the pump body or inlet pipe with liquid until the liquid flows out of the exhaust valve to remove air.
Start and Run
- Power on: Ensure that the power supply voltage meets the equipment requirements, and then connect the power supply.
- Observation: After starting, closely observe the operation status of the pump, listen for any abnormal noise, and check for any water leakage.
- Flow and head: The design flow and head of the sewage pump are limited, and overloading should be avoided to prevent damage.
Stop and maintain
- Stop: Under normal circumstances, when the liquid level is below the suction port of the pump, the pump will automatically stop (if equipped with a liquid level controller). When manually stopping, the power should be disconnected first.
- Cleaning: After each use, if conditions permit, the pump should be cleaned, especially the impeller and suction port, to prevent impurities from clogging.
- Storage: When not in use for a long time, the pump should be removed, wiped dry, and stored in a dry and ventilated place.
Usage of sewage pump
The use of sewage pumps mainly depends on their type and design purpose:
Submersible sewage pump:
- Direct input: usually directly input into the liquid that needs to be drained. The pump body is completely immersed in the liquid for operation, using buoyancy or fixed devices to maintain its position.
- Automatic control: Many submersible sewage pumps are equipped with float level switches, which can automatically start and stop according to the liquid level, achieving unmanned operation.
Non submersible sewage water pump (self-priming or ordinary centrifugal):
- Installation and fixation: It needs to be installed on the ground and connected to the water source and discharge point through pipelines.
- Manual or remote control: Its start and stop may require manual operation or remote control through an external control system (such as PLC).
- Suction limit: The suction range (vertical distance from the liquid level to the pump) of non submersible sewage pumps is limited, and this factor needs to be considered during installation.
Application scenarios of sewage pumps
During the use of sewage pumps, some common problems may be encountered:
Insufficient flow or head:
Reason: Wear or blockage of impeller, blockage of inlet or outlet pipe, excessive clearance between sealing rings, presence of air inside the pump body, insufficient speed.
Solution: Clean the impeller and pipeline, check the sealing ring, exhaust the air inside the pump, and check the motor speed.
Excessive noise or vibration:
Reason: There are foreign objects inside the pump, unbalanced impeller, damaged bearings, and unstable installation.
Solution: Clean the foreign objects inside the pump, check the balance of the impeller, replace the bearings, and reinforce the installation of the pump.
Pump overheating:
Reason: Long term overload operation, lack of oil or damage to bearings, poor sealing leading to liquid leakage.
Solution: Reduce load, check bearing lubrication, inspect and repair seals.
Motor burnt out:
Reason: Long term phase loss operation, low voltage, frequent starting, prolonged idling or blockage of the water pump.
Solution: Check the phase of the power supply to ensure stable voltage, avoid frequent starting, and ensure that the pump operates in the presence of liquid.
Correctly understanding and mastering the operation, usage, applicable scenarios, and common problem handling methods of sewage pumps can greatly improve their efficiency, extend equipment life, and avoid unnecessary losses.
Sewage pumps are widely used in the following scenarios:
- Municipal engineering: used for sewage treatment plants, drainage systems, sewers, rainwater pumping stations, etc., to transport domestic sewage and industrial wastewater.
- Construction site: used to remove accumulated water and mud during excavation, basement, and tunnel construction.
- In the industrial field, it is used to transport wastewater containing corrosive and abrasive media in industries such as chemical plants, mines, and metallurgy.
- Agriculture and animal husbandry: used for irrigation and drainage of farmland, as well as wastewater discharge from animal husbandry farms.
- Emergency drainage: used to quickly remove large amounts of accumulated water in flood disasters or other emergency situations.
- Property management: used for sewage discharge and basement drainage in high-rise buildings, shopping malls, and hotels.
Common problems with sewage pumps
During the use of sewage pumps, some common problems may be encountered:
Pump does not start:
Reason: Power failure, blown fuse, motor overload protection action, control circuit problem, low liquid level.
Solution: Check the power connection and voltage, replace the fuse, reset the overload protector, check the control circuit to ensure sufficient liquid level.
Reason: Power failure, blown fuse, motor overload protection action, control circuit problem, low liquid level.
Solution: Check the power connection and voltage, replace the fuse, reset the overload protector, check the control circuit to ensure sufficient liquid level.
Insufficient flow or head:
Reason: Wear or blockage of impeller, blockage of inlet or outlet pipe, excessive clearance between sealing rings, presence of air inside the pump body, insufficient speed.
Solution: Clean the impeller and pipeline, check the sealing ring, exhaust the air inside the pump, and check the motor speed.
Excessive noise or vibration:
Reason: There are foreign objects inside the pump, unbalanced impeller, damaged bearings, and unstable installation.
Solution: Clean the foreign objects inside the pump, check the balance of the impeller, replace the bearings, and reinforce the installation of the pump.
Pump overheating:
Reason: Long term overload operation, lack of oil or damage to bearings, poor sealing leading to liquid leakage.
Solution: Reduce load, check bearing lubrication, inspect and repair seals.
Motor burnt out:
Reason: Long term phase loss operation, low voltage, frequent starting, prolonged idling or blockage of the water pump.
Solution: Check the phase of the power supply to ensure stable voltage, avoid frequent starting, and ensure that the pump operates in the presence of liquid.
Correctly understanding and mastering the operation, usage, applicable scenarios, and common problem handling methods of sewage pumps can greatly improve their efficiency, extend equipment life, and avoid unnecessary losses.
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