Maintaining and Troubleshooting Self-Priming Sewage Pumps
First, let's discuss the maintenance of a self-priming sewage pump.
1) Inspect the piping and connections of the pump for any looseness. Manually or with a tool, rotate the pump to ensure it turns smoothly without obstruction.
2) Operate the pump within the recommended flow and lift ranges to maximize efficiency and achieve optimal energy savings.
3) Monitor the bearing temperature during operation; it should not exceed the ambient temperature by more than 35°C, with a maximum allowable temperature of 80°C.
4) If unusual noises occur, stop the pump immediately and investigate the cause.
5) When shutting down the pump, close the gate valve and pressure gauge before turning off the motor.
6) For pumps that will be idle for extended periods, especially in winter, open the drain plug at the bottom to remove the media and prevent freezing. Clean the pump chamber with water if necessary.
7) Regularly listen to the motor for unusual sounds. Use tools like a screwdriver to pinpoint vibrations. This can help identify issues such as insufficient bearing lubrication, which requires immediate attention to avoid damage.
Now, let’s address common pump failures:
A) Insufficient Pump Output:
1) Corrosion of the impeller in a stainless steel pump? Replace the impeller.
2) Pump performance doesn't meet design requirements? Consider upgrading to a more suitable pump.
3) Low speed? Check and restore the correct current and speed.
4) Excessive clearance between the semi-open impeller and the pump cover? Reduce the gap.
B) Severe Pump Vibration:
1) Misalignment between the pump and motor shafts? Align them properly.
2) Bent pump shaft? Straighten or replace it.
3) Imbalanced impeller? Balance or replace it.
C) Overheating Bearings:
1) Insufficient lubrication? Add grease to the proper level.
2) Shaft misalignment? Correct alignment.
3) Damaged bearings? Replace them.
D) Mechanical Seal Leakage:
1) Insufficient spring pressure? Adjust spring compression or replace the spring.
2) Corrosion or wear on the sealing rings? Repair or replace them.
3) Loose securing screws? Tighten or adjust springs.
4) Damage to the moving ring assembly? Reinstall or replace.
5) Skewed static assembly? Realign the static components.
6) Poor sleeve machining? Improve sleeve precision.
7) Impurities or crystallization affecting the moving ring? Clean thoroughly.
E) Severe Packing Leak:
1) Packing too loose? Tighten appropriately.
2) Poor packing setup? Adjust the packing gland for better alignment.
3) Worn-out packing? Replace with uniform material.
4) Poor-quality packing? Use high-quality asbestos packing.
5) Excessive sleeve wear? Replace the sleeve.
F) Motor Overheating:
1) Pump operating outside its design specifications? Choose a suitable motor.
2) Oversized motor for the application? Match motor to pump requirements.
3) Packing gland or mechanical seal too tight? Adjust accordingly.
4) Poor assembly causing friction or misalignment? Inspect and correct.
By following these maintenance tips and troubleshooting steps, you can ensure your self-priming sewage pump operates efficiently and lasts longer. Always prioritize regular checks and maintenance to avoid costly repairs and downtime.
CS20A Household Electric Screwdriver Set
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