Guidelines for Routine Maintenance of Cooling Towers
Key Points for Daily Maintenance
(1) Operational Records and Data Management
Upon completion of construction, installation, and commissioning, the manufacturer must supply comprehensive performance data for the cooling tower. This dataset should encompass thermal characteristics, resistance characteristics, design parameters (water load, heat load), ambient conditions (dry-bulb and wet-bulb temperatures), cooling range, air flow rate, power consumption, water evaporation loss, makeup water volume, cycles of concentration, specific fan power consumption, and inlet water pressure. The user's relevant operational department is responsible for establishing and maintaining detailed operational records of these parameters for performance benchmarking and troubleshooting.
(2) Measurement Instrumentation and Methods
To effectively monitor operational performance or evaluate cooling capacity, it is necessary to conduct in-situ tests or performance verification on the operating cooling tower. This requires not only trained technical personnel but also adherence to standardized test procedures. A suite of calibrated instruments must be available, which may include (with necessary spares): thermometers, micromanometers/pressure gauges, sound level meters, anemometers, and flow meters.
(3) Fan and Drive Assembly Maintenance
Fan and Drive Shaft: Conduct periodic inspections of fan blades for damage, cracks, imbalance, or material degradation. Regularly check the drive shaft and couplings to ensure proper alignment, levelness, and integrity.
Gear Reducer: Perform regular checks of the oil level and oil condition (e.g., for contamination or moisture) in the gear reducer. Utilize seasonal shutdowns for scheduled oil changes and comprehensive inspections of internal components, gears, and bearings.
(4) Cold Water Basin (Collection Sump) Maintenance
Maintain the cold water basin at the designed depth to prevent pump cavitation. The freeboard (the distance from the water surface to the basin rim) should typically be 15–30 cm. The effective water level must be maintained within operational limits, with automatic makeup water valve adjustments as needed.
For Cross-Flow Towers: If the operating water level falls below the design level, install a baffle (sway braces or a splash apron) below the original water surface to prevent air short-circuiting.
General Basin Upkeep: Clean the basin periodically to remove accumulated sediment, sludge, and debris. Clear debris from the fill media and its support structure. Keep pump suction screens clean. Regularly inspect the basin for leaks. Ensure proper operation of chemical feed systems (e.g., for acid, biocides like chlorine, and scale/corrosion inhibitors), especially before and after maintenance activities.
(5) Hot Water Distribution System Maintenance
Maintain the cleanliness and unobstructed flow of the entire hot water distribution system. This includes flow control valves, pressure stabilizers, inlet pipes, distribution pipes, nozzles, and spray arms (for rotary distributors).
For Gravity Distribution Systems (Basins/Troughs): Adjust weirs or orifices to ensure uniform water flow to each cell, achieving a consistent water depth (typically between 100 and 150 mm) across the distribution basin.
System Adjustment: If significant changes occur in the circulating water flow rate, the distribution piping, orifice sizes, or nozzle arrangements must be reviewed and adjusted accordingly to maintain even water distribution over the fill media.
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