Reasons for gas in the radiators
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In my company’s heating system, the outlet pressure is 0.25 MP and the return pressure is 0.15 MP. The main pipelines in the workshops are arranged in a loop format, with each branch having a single inlet and a single outlet. Yet, why does air accumulate on the third floor over time? I’m not sure what could be the cause; it might be a bit vague, but I don’t think it has anything to do with the pump’s head or flow rate (85). I would appreciate advice from those who are more knowledgeable than me.
Is the third floor the top floor? Is there no system vent valve in the system settings?
It works fine every time after releasing the air manually; after a couple of hours, air builds up again. I can’t figure it out.
Check whether the slope of the pipe branch section is incorrect, or if there is a reverse slope
When you release air manually, you do it on the radiator; in your case, it seems that an automatic air release valve has not been installed at the highest point of the system.
It has nothing to do with flow rate and head, right?
The system has been in use for 10 years, and many of the pipes inside the wall panels of the radiators have leaked. I fixed them all, and the water pressure test showed no problems. However, gas tends to form after heating starts; once that gas is released, it reappears after a few days
No, it’s a system issue; it seems to be a problem with the automatic exhaust valve. Air is present in the heating water after it has been heated, and this air rises upward and is discharged through the automatic exhaust valve. If the gas isn’t discharged, it will accumulate in the radiator, preventing the heating water from filling the radiator properly. As a result, the cooling effect is compromised, which affects the heating performance. Now you understand the importance of the automatic exhaust valve, right?
Is it true that the exhaust valve should be set as high as possible?
It seems that the highest floor of the building is the 3rd floor, the top floor. This question is unclear, so it’s impossible to discuss the reasons.