Application and Maintenance of Double-Suction Split-Case Pumps in Thermal Power Plants

1. Application of Double-Suction Split-Case Pumps in Thermal Power Plants

Double-suction split-case pumps (also known as horizontal split-case centrifugal pumps) are widely used in key systems of thermal power plants due to their high flow rate, high head, and stable operation. Major applications include:

1)Circulating water system: Cools condensers to ensure efficient steam turbine exhaust condensation.

2)Boiler feedwater system: Functions as a booster pump or auxiliary feed pump to maintain stable water supply to boilers.

3)Cooling water system: Provides cooling water for generators, lubricating oil systems, and other equipment.

4)District heating system: Used in cogeneration plants to transport hot water or steam.

Thanks to their double-suction design, water enters the impeller from both sides, balancing axial forces and ensuring smoother operation. This makes them ideal for high-flow, long-term continuous operation in thermal power plants.

2. Key Maintenance Practices for Double-Suction Split-Case Pumps

To ensure reliable long-term operation, the following maintenance measures should be implemented:

(1) Routine Inspections

1)Vibration and noise monitoring: Abnormal vibrations may indicate bearing wear, impeller imbalance, or misalignment.

2)Bearing temperature: Regularly check lubrication; overheating may result from insufficient oil or bearing damage.

3)Seal leakage: Mechanical seals or packing should not show excessive leakage to prevent water ingress into bearings or motors.

(2) Scheduled Maintenance

1)Lubrication management: Replace or replenish bearing grease/oil as required.

2)Alignment check: Ensure coupling alignment is within tolerance to avoid excessive vibration.

3)Impeller inspection: Periodically disassemble and clean the impeller, checking for wear or cavitation; repair or replace if necessary.

(3) Troubleshooting Common Issues

1)Insufficient flow rate: May be caused by inlet blockage, impeller wear, or cavitation—clean filters or replace the impeller.

2)Bearing overheating: Check lubrication and replace bearings if needed.

3)Abnormal noise: Investigate potential foreign object entry or cavitation, and adjust operating conditions.

3. Conclusion

Double-suction split-case pumps are critical equipment in thermal power plants, and their performance directly impacts plant efficiency. Proper selection, standardized operation, and scientific maintenance can extend service life, reduce failure rates, and ensure safe and economical power plant operation.

With six decades of expertise in split-case pump development and production, Zibo Lu Zhong Industrial Pump Factory welcomes cooperative partnerships across all regions for mutual success.