The daily maintenance frequency of the water cooling system needs to be comprehensively set according to the equipment operating conditions, water quality conditions, and usage environment. It is usually divided into three levels: daily inspection, regular maintenance, and annual overhaul. The specific cycle and content are as follows:

1、 Daily inspection (daily/shift)

Core objective: Real time monitoring of operational status, timely detection of sudden issues such as leaks and abnormal sounds.

Operation content:

Parameter recording: Record the inlet temperature (≤ 35 ℃), outlet temperature (≤ 50 ℃), system pressure (0.2-0.4MPa), and flow rate (90-110% of rated value). If the deviation exceeds 10%, a warning should be issued.

Appearance inspection: Visually inspect the surface of pipelines, interfaces, and coolers for water dripping, oil stains, or abnormal vibrations, with a focus on observing flange and welding points that are prone to leakage.

Equipment operation status: Monitor whether the sound of the water pump and fan is stable and whether there is any abnormal noise (such as cavitation sound, friction sound), and touch whether the temperature of the bearing seat shell is uniform (normal ≤ 60 ℃).

2、 Weekly maintenance (every 7 days)

Core objective: To prevent initial blockage and component jamming, and maintain basic performance.

Operation content:

Filter cleaning: Disassemble the filter at the inlet of the waterway (accuracy ≥ 50 μ m), remove impurities such as sediment and rust from the filter element, and shorten the cleaning cycle if there are too many impurities (such as once every 3 days).

Valve activity: Manually open and close the bypass valve and globe valve 1-2 times to prevent the valve core from rusting and getting stuck due to long-term inactivity. The gate valve should be ensured to be fully open or fully closed.

Initial water quality inspection: Use pH test strips to quickly detect the acidity and alkalinity of the cooling water (target 7.5-8.5). If it is significantly acidic/alkaline, a neutralizing agent needs to be added to adjust it.

3、 Monthly maintenance (every 30 days)

Core objective: Deep cleaning and performance calibration to prevent scaling and microbial growth.

Operation content:

Full range water quality testing: Entrust the laboratory to test hardness (≤ 50mg/L CaCO3), conductivity (≤ 300 μ S/cm), and microbial content. When exceeding the standard, add softeners or fungicides (such as isothiazolinone).

Surface cleaning of cooler: Open the end cover of the cooler and rinse the outer wall of the heat exchange tube with a high-pressure water gun (pressure ≤ 0.5MPa) to remove dust and oil stains. If it is an air-cooled cooler, clean the debris on the fan blades.

Instrument functional inspection: Compare the displayed values of the pressure gauge and flow meter with the actual working conditions, and mark them for calibration when the error exceeds ± 5% (the formal calibration cycle is six months).

4、 Quarterly maintenance (every 90 days)

Core objective: To address seasonal issues in a targeted manner, such as high temperatures in summer and the risk of frost cracking in winter.

Operation content:

Water change and system flushing: Drain all cooling water, circulate and flush the pipeline with clean water for 20-30 minutes to remove mildly deposited impurities, and add corrosion inhibitors (such as organic amines) after water change.

Sterilization treatment: Add non oxidizing fungicides once every quarter during summer (June September) to suppress algae and bacterial growth; If the equipment shuts down in winter, it is necessary to drain the accumulated water in the pipeline to prevent freezing and cracking.

Seal inspection: Disassemble the bearing seat end cover and visually inspect the water jacket sealing ring (fluororubber or nitrile rubber) for slight aging. If slight hardening occurs, apply silicone grease. If severe, mark for replacement (the replacement cycle is usually 5000 hours).

5、 Annual major overhaul (every 12 months)

Core purpose: To deeply disassemble and maintain, restore equipment performance, and extend service life.

Operation content:

Chemical cleaning of pipelines: Use a 5-8% citric acid solution to circulate and rinse the pipelines for 4-6 hours to dissolve scale and rust. Then rinse with clean water and add corrosion inhibitors. After cleaning, the pipeline wall thickness needs to be checked (replace when corrosion thinning exceeds 20%).

Pressure test of cooler: Conduct a water pressure test on the tubular cooler (1.25 times the working pressure, hold for 30 minutes), seal or replace any leaking heat exchange tubes, and replace the end cap sealing gasket.

Instrument calibration and replacement: Send the pressure gauge and temperature sensor to the measuring institution for calibration, and replace them directly if the error exceeds the standard; Check if the impeller of the flowmeter is worn and replace it with a new component if necessary.

Comprehensive maintenance of bearing seat: Disassemble the bearing seat, measure the wall thickness of the water jacket (ultrasonic thickness gauge), replace all sealing rings. If the bearing has been running for more than 10000 hours, replace the lubricating grease or bearings synchronously.

6、 Special working condition adjustment

High hardness water quality scenario: If the hardness of the cooling water is greater than 100mg/L CaCO3, the weekly filter cleaning should be changed to once every 2 days, the monthly water quality testing should be changed to once every 2 weeks, and the chemical cleaning cycle should be shortened to once every 8 months.

Continuous high load operation: daily inspections have been increased to 2 times, quarterly water changes have been changed to once every 2 months, and the replacement cycle of bearing seat seals has been shortened to 3000 hours.

Frequent start stop equipment: Before each start, check whether there is air in the pipeline (open the exhaust valve to vent), increase the valve activity frequency once a week (such as once a day) to prevent valve core jamming.

Key points for maintenance frequency and record management

Dynamic adjustment principle: The maintenance cycle is not fixed and needs to be flexibly shortened or extended based on actual operating data (such as scale deposition rate, leakage frequency). For example, if the effluent temperature of a certain equipment continues to rise for three consecutive months, the chemical cleaning cycle may need to be advanced from one year to six months.

Electronic ledger records: Use Excel or specialized operation and maintenance software to record the time, content, replacement part model, and testing data (such as pH value, hardness, pressure) of each maintenance, and predict faults through trend analysis (such as discovering a monthly decrease of 0.05MPa in pressure, which may indicate gradual pipeline leakage).

Personnel training: Operators need to be familiar with the operating procedures of different maintenance cycles, such as strictly following the pressure test steps during annual major repairs to avoid equipment damage caused by operational errors.

summary

The frequency of scientific maintenance needs to balance "prevention" and "economy" - daily inspections ensure immediate detection of problems, regular maintenance prevents progressive failures, and annual major repairs fundamentally restore system performance. Through a graded maintenance strategy, the service life of the water cooling system can be extended (usually up to 8-10 years) while reducing operation and maintenance costs, avoiding downtime losses caused by sudden failures.