Chilled water pipe cleaning is essential for maintaining the efficiency of HVAC systems in buildings and industrial facilities. Over time, scale, sludge, rust, algae, and biofilms can accumulate inside the pipes, reducing heat transfer, increasing pump loads, and potentially damaging system components. Here's a short step-by-step guide on how to clean chilled water pipes:
1. System Shutdown and Safety
Before cleaning, shut down the chilled water system completely. Ensure all valves are closed and follow all safety protocols, including wearing appropriate PPE (gloves, goggles, etc.).
2. Drain the System
Drain the chilled water loop to remove existing water and prepare the pipes for cleaning chemicals or mechanical treatment.
3. Chemical Cleaning
Introduce a suitable chemical cleaning agent (such as a descaling solution or biocide) into the system. This step dissolves mineral scale, rust, and organic buildup. Circulate the chemical through the pipework using a temporary pump for 6–12 hours, depending on the level of contamination.
4. Mechanical Flushing (Optional)
In heavily contaminated systems, mechanical methods like pigging (pushing cleaning "pigs" through the pipes) or high-pressure water jetting may be used alongside or instead of chemical cleaning.
5. Rinse and Neutralize
Flush the system with clean water to remove all chemicals and loosened debris. Use a neutralizing agent if acidic cleaners were used, and check the pH to ensure it's back to normal.
6. Refill and Restart
Once cleaning is complete, refill the system with clean, treated water (usually with corrosion inhibitors) and restart the chiller. Monitor system pressure and water quality.
Conclusion
Routine cleaning of chilled water pipes improves energy efficiency, prevents breakdowns, and extends the lifespan of HVAC systems. Always consult the system manual and chemical supplier for specific instructions and safety measures.
