Pumps are critical components in the infrastructure of modern buildings. They facilitate the movement of fluids water and oil serving key functions in heating, ventilation, air conditioning (HVAC), fire suppression, plumbing, and wastewater systems. Ensuring the proper maintenance of these pumps is crucial to maintaining their efficiency, preventing costly repairs, and avoiding downtime in essential building services.

Understanding common pump issues helps in diagnosing problems early and taking proactive steps to avoid them. Some of the most frequent pump problems include:

1. Cavitation: Cavitation occurs when vapor bubbles form inside the pump, causing damage to the pump components and reducing its efficiency. It is often caused by running the pump at low flow or pressure, or if there is insufficient suction.
2. Seal Failures: Pumps rely on seals to prevent leaks. Over time, seals can wear out or become damaged due to continuous exposure to pressure, temperature fluctuations, or harsh fluids. Seal failures can lead to fluid leaks, environmental hazards, and loss of performance.
3. Motor Issues: The motor that powers the pump is susceptible to wear and overheating, particularly if the pump operates for long periods or is subjected to irregular load conditions. Overheating can cause motor failure, leading to expensive repairs.
4. Clogging or Blockages: Pumps that handle wastewater or sewage can become clogged with debris, which can cause the pump to work harder or stop entirely. Clogs can also affect the system’s performance, leading to reduced flow or system damage.
5. Misalignment or Vibration: Misalignment of pump components or excessive vibration is a sign of an underlying issue, such as a worn bearing, unbalanced impeller, or damaged shaft. This can lead to excessive wear on the pump and its components, decreasing its lifespan.

Regular maintenance ensures the optimal performance and longevity of building pumps. Below are essential practices for maintaining pumps in a building setting:

Routine Inspection and Monitoring

• Check for Leaks and Corrosion: Periodically inspect the pump housing, seals, and piping for leaks or signs of corrosion. 
• Examine Vibration Levels: Excessive vibration can indicate mechanical issues. Using vibration monitors or handheld tools can help detect alignment or bearing problems.
• Monitor Pressure and Flow Rates: Regularly assess the system’s pressure and flow rate to ensure they meet operational standards. 

Lubrication

• Check and replace lubricants as recommended by the manufacturer. Proper lubrication prevents overheating and excessive wear, extending the life of pump components.

Cleaning

• Regularly clean the pump’s inlet, impellers, and filters to avoid debris buildup. 
• Inspect air vents and drainage lines for blockages that may hinder pump function.

Checking Motor and Electrical Systems

• Check electrical connections and monitor for any signs of overheating or irregular operation.
• Tighten loose electrical connections and replace damaged wiring or components as necessary.

Calibrating Controls

• Ensure that sensors and controls are properly calibrated to avoid overloading the system or running the pump under inefficient conditions.

Seal and Bearing Inspection

• Regularly inspect seals and bearings to ensure they are in good condition. Look for signs of wear or leaks, and replace seals or bearings at the first indication of failure. 

Ensure Proper Alignment

• Regularly check that the pump shaft and motor are correctly aligned to reduce strain on bearings and other parts. Any misalignment should be corrected promptly.

All Dewick & Associates O&M manuals provide step-by-step Preventative Maintenance Log sheets for all plant and equipment within the project installation which are used on site throughout the life of the building.

Author: Louise Gardner, General Manager