Pour clean coolant, water or antifreeze into the new heating system and after a small a period of time it begins to darken, collect suspended particles and turn into black slurry.
Why is this happening, what needs to be done to prevent this from happening and how to clean the system?
Important: you need to understand that sludge particles can settle on the heat exchanger, disrupting the heat transfer from the heated gases to the liquid, disabling the boiler elements. The flow area of the control valves and heating radiator channels is also reduced or completely clogged.
The system is closed, it is under pressure and no one specifically pours dirt into it. But it turns out that in a system that periodically heats up and cools down, its own stormy life occurs. And even in any standing container, the vital processes of microorganisms take place.
Oxygen
- The first thing that affects the formation of suspended particles and sludge in the coolant is free, dissolved oxygen. It interacts with ferrous and non-ferrous metals of heat exchangers, radiators, fittings and pipelines, oxidizing them.
- Oxygen enters the new heating system with a heating medium, for example from tap water. Subsequently, from the system make-up or after repair work.
- Also, this active element is able to penetrate through the polymer walls of the pipeline. Plastic, in contrast to metals, has a "looser" structure through which oxygen freely penetrates into the heating system, even if it is under excessive pressure.
- If the system is improperly installed, automatic air vents are capable of "grabbing" air at negative pressure in the pipeline.
- In addition, the system may contain hydrogen sulfide, chlorine, etc. active elements, they also contribute to the coding of the elements of the heating system.
Bacteria
With a long operation of the heating system, at temperatures below 60, anaerobic bacteria and algae may appear in system, which will additionally cause the formation of suspended particles affecting the correct operation of the heating equipment. To the touch, the infected blackened elements of the coolant resemble mucus.
Recommendations for heating systems
Can be installed sludge degasser. It removes free oxygen and traps system debris
Should be installed automatic air vents for heating. These devices remove bubbles of formed gases and oxygen from the system.
Strainer on the pump inlet or in front of the boiler, are mandatory for installation
Can't change waterif it has already worked in the system and the oxygen in it has reacted with the surrounding equipment and piping. With a special coolant, such as propylene glycol and ethylene glycol, the situation is different, they must be changed every 5-10 years according to the manufacturer's recommendation.
Desirable pour prepared water instead of tap water
Recommended use a pipeline with oxygen protection
"Ignite" heating system up to 80 degrees and holding for two hours if bacteria are detected.
Tip of the day:
How to understand what's going on with your heating system? If you bleed the air mixture from the radiator and it smells of hydrogen sulfide, then bacteria dominate your system. If the gas burns and has no odor, then hydrogen has accumulated in the radiators. If the gas does not smell and does not burn, then normal air is emitted.
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