| 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 |
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| 2. | Excessive noise | 2a. | Excessive or insufficient seal liquid to pump | 2a. | Adjust seal flow rate |
| 2b. | Coupling misalignment | 2b. | Realign coupling |
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| 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 |
