Maintenance Guide and Troubleshooting for Vertical Turbine Pumps

Routine maintenance of vertical turbine pumps is crucial for maintaining their good operating condition and extending their service life. Regular maintenance and inspections allow for the timely detection of potential problems and the implementation of effective solutions, thereby preventing malfunctions and ensuring the stable operation of industrial circulating water systems. Specific routine maintenance methods and frequencies are as follows:

 

 

• Maintenance Guide

Routine Maintenance

- Perform a daily visual inspection of the pump, checking the pump body, piping, valves, and other components for leaks, damage, or deformation.
- Check the pump's operating sound for normalcy. If abnormal noise or vibration is detected, immediately stop the pump and investigate the cause.
- Monitor the pump's inlet and outlet pressure, flow rate, and current, comparing them to normal operating data to determine if the pump is functioning correctly. Typically, pump operating parameters should fluctuate within the rated range-for example, flow rate fluctuations should not exceed ±5%, and pressure fluctuations should not exceed ±10%.

 

Weekly Maintenance

- Inspect the pump bearings weekly and measure bearing temperature and vibration levels. Bearing temperature should generally not exceed 35°C above ambient temperature, and the maximum temperature should not exceed 80°C. Vibration levels should meet relevant standards; typically, at a speed of 1800 r/min, the effective vibration velocity should not exceed 4.5 mm/s.
- Check the bearing lubrication condition to ensure the lubricating oil level is normal and the oil quality is good. If the lubricating oil is found to be deteriorated or contaminated, it should be replaced immediately.

 

Monthly Maintenance

- Inspect the pump's sealing system monthly for leaks. For mechanical seals, the leakage rate should generally not exceed 5 drops per minute. If excessive leakage is found, check the wear of the sealing surfaces, the elasticity of the sealing springs, and the correct installation of the seals; replace the seals if necessary.
- Inspect the pump impeller and pump body for wear. If any component is severely worn, repair or replace it promptly.

 

Quarterly Maintenance

- Clean the pump's inlet and outlet pipes quarterly to remove dirt, impurities, and sediment, ensuring unobstructed flow. Also, check the pipe supports and hangers for security. Repair any loosening or damage immediately.

 

Annual Maintenance

- Perform a comprehensive overhaul of the water pump annually, including disassembling the pump body, inspecting all components for wear, corrosion, and damage, and replacing severely worn parts.
- Readjust the pump shaft system and adjust the coupling clearance and concentricity.
- Inspect and maintain the motor, including cleaning the motor interior, checking the winding insulation, and replacing the brushes.

 

Common Faults and Troubleshooting

Vertical turbine pumps may experience some common malfunctions during operation, requiring prompt resolution:

 

Insufficient flow or no water discharge

Possible causes: Clogged suction or discharge sides by debris (e.g., filter screen, impeller, guide vanes, discharge pipe, or valve system).
Solution: Stop the pump, clean these components, and remove any blockages.
Possible causes: Excessive wear of the sealing rings, leading to increased internal leakage and affecting flow.
Solution: Replace the sealing rings.

Other causes: Impeller damage, incorrect rotation direction, low voltage, or insufficient immersion depth (leading to air intake).
Solution: Replace the impeller, correct the rotation direction, measure voltage and frequency to check the motor, or increase the suction water level.

 

Abnormal Vibration and Noise

Possible Causes: Low suction water level or excessively large discharge gate valve opening, leading to pump cavitation.

Solution: Increase the suction water level or decrease the discharge gate valve opening.

Possible Causes: Impeller imbalance.

Solution: Correct the impeller static balance.

Possible Causes: Excessive shaft concentricity deviation (causing additional stress during pump operation, resulting in vibration).

Solution: Correct shaft concentricity and straighten the shaft.

Possible Causes: Loose anchor bolts (causing unstable pump operation and vibration/noise).

Solution: Tighten anchor bolts.

Possible Causes: Worn or damaged bearings.

Solution: Replace bearings.

 

Bearing overheating

Possible cause: Poor lubrication (e.g., insufficient, deteriorated, or contaminated lubricating oil).

Solution: Replenish or replace lubricating oil promptly.

Possible cause: Improper bearing assembly (e.g., clearance too small or too large).

Solution: Readjust the bearing assembly clearance.

Possible cause: Excessive pump load (e.g., excessive flow rate or head, leading to increased bearing pressure).

Solution: Adjust the flow rate and head to reduce the load.

 

The maintenance and upkeep of vertical turbine pumps requires careful consideration of multiple aspects, including daily inspection and monitoring, lubrication and sealing maintenance, cleaning and servicing, equipment adjustment and replacement, electrical and mechanical maintenance, and long-term shutdown and seasonal maintenance. Through scientific maintenance and upkeep measures, the normal operation of vertical turbine pumps can be ensured, and their service life extended.