Liquid Rinq 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
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