Liquid Ring Vacuum Pumps – Troubleshooting Tips

  Observed problem   Problem source   Corrective measure
1. Reduced capacity of pump 1a. Seal water temperature higher than design 1a. Reduce temperature by increasing cooling water flow or check seal cooler for fouling
    1b. Low seal water flow rate 1b. Adjust seal water flow rate or check centrifugal recirculation pump
2. Excessive noise 2a. Excessive or insufficient seal liquid to pump 2a. Adjust seal flow rate
    2b. Coupling misalignment 2b. Realign coupling
3. High power consumption 3. Excessive seal liquid 3a. Adjust seal flow rate
    3b. Coupling misalignment 3b. Realign coupling
    3c. Excessive discharge pressure 3c. Correct as necessary
    3d. Defective bearing 3d. Replace bearing
    3e. Gland ring too tight 3e. Loosen gland ring
    3f. Improperly mounted pump
3f. Make sure mounting surface is level
4. Overheating 4a. Excessive seal liquid temperature 4a. Check coolant flow rate and seal cooler fouling
    4b. Insufficient seal liquid flow rate 4b. Increase seal liquid flow rate
    4c. Coupling misalignment 4c. Realign coupling
    4d. Defective bearing 4d. Replace bearing
    4e. Gland ring too tight 4e. Loosen gland ring
    4f. Improperly mounted pump 4f. Make sure mounting surface is level
5. Vibration 5a. Coupling misalignment 5a. Realign coupling
    5b. Pump or motor not properly anchored 5b. Anchor pump or motor
    5c. Rotor imbalance 5c. Balance rotor
    5d. Improperly mounted pump 5d. Make sure mounting surface is level
6. Mechanical seals “squeak” 6. Insufficient lubrication 6. Check flow of coolant to seals
7. Pump shaft is seized and will not turn 7a. Scale from hard water 7a. Remove scale from pump
    7b. Foreign object in pump 7b. Dismantle pump and remove object
    7c. Improperly mounted pump 7c. Make sure mounting surface is level