Annoying noises (dripping, knocking, squeaking) in the heating radiators in the

Hello,
I live on the top (second) floor of a cooperative block, in a corner apartment. There are only three apartments vertically. Since we bought an apartment (in 2010), I have been fighting with "experts" from the cooperative with, in my opinion, a defective system straight from the 1970s or 1980s.
Every time the heating season starts, you can hear a hum in the radiators, which is heard even when the thermostat (Danfoss) is set to 1 and increases as the heating is turned on. When I intervene, the gentlemen reduce the pressure and the noise fades for a while (it never completely disappears, but it's still possible to live). It can be adjusted - so ok. This year, after adjusting the pressure, there was a slight, little-audible squeaking during the day, which is quite bothersome at night. Of course, professionals do not hear the squeak. Recently, other sounds have joined the squeak - something like dripping in radiators (but interestingly only in two radiators, in two rooms on one side of the apartment). And looking for a solution to the problem (because the experts first made me wait a week for the pressure to normalize in the blocks, and then spread their hands, that they do not know how to fix it, that there are such sounds in many apartments and people live somehow, etc.) I found this forum . I tried to play with the settings on the thermostat (from 1 to 7 to N) on my own, but unfortunately it does not help. The dripping (in the middle) stops completely once, then gently intensifies, then harder, louder, and then silence for a while. I am asking for advice on what the causes of this noise may be and what to suggest to the "experts". That year it was dripping slightly, but one of the gentlemen came, put something up, checked the "knot" downstairs and it stopped. This year, my specialists were overwhelmed by the powerlessness.
I apologize for such a long message and thank you in advance for the hints.

malizna777 wrote:

I am asking for advice on what the causes of this noise may be and what to suggest to the "experts".

In my opinion, there are air in the radiators (you need to vent) .... The reason may be a small amount of water in the circuit ...

malizna777 wrote:

Hello,
I live on the top (second) floor of a cooperative block, in a corner apartment. There are only three apartments vertically. Since we bought an apartment (in 2010), I have been fighting with "experts" from the cooperative with, in my opinion, a faulty system, straight from the 1970s or 1980s.

Do you have air vents? on risers or on radiators?

Have you vented?

Thanks for the answers.
I have air vents installed on each radiator. Professionals always start by venting the riser, but they do it outside my apartment, so I suspect there is a "system" for venting the system downstairs in the basement. We have the fact that at least one radiator has to be deaerated in each heating season, which we always do when something starts to bubble or the radiator does not heat up. This year we have repeated this procedure several times and it did not help.

malizna777 wrote:

This year we have repeated this procedure several times and it did not help.

Was it better right after venting?

Is there absolutely no improvement?

The venting did nothing to help the squeak coming out of the radiators. There was no change / improvement after these treatments. With this squeaking, I have an impression differently - depending on whether the neighbor turns on the heater (you can hear the valve turning), what is the outside temperature. Once there is a sound as if the radiators were broadcasting to me in the walrus alphabet, and once only a gentle, uninterrupted whistle / whistle. Generally it is not disturbing during the day, worse at night when it is quiet around.
And the dripping did not appear immediately with the start of the heating season, but about a week - a week and a half ago, and the radiators were probably vented at that time. The riser was certainly vented after reporting the dripping to the administration, but probably not the radiators themselves. I will try to bleed the radiators again tomorrow, maybe it will work.

malizna777 wrote:

other sounds - something like dripping in radiators

These types of noises arise if not for expansion joints at the transitions of the CO risers between ceilings, or the CO pipe rubbing against something. It is enough when some hard lint gets in these places and "drips".

The radiators were vented again yesterday evening. Without result. It was dripping at night.
With these expansion joints, I've already read something about it. But wouldn't the problem then be permanent - that is, it would start dripping as soon as water was introduced into the radiators, and not some time later?
I also found an interesting article answering a similar question to my query:
http://www.ekspertbudowlany.pl/artykul/id2067,d Why-zawory-grzejnikowe-stukaja

Maybe it is still the fault of inadequate pressure?

Today the specialists were back (when I was at work) and it seems that they were doing something downstairs in the basement because there were water stains on the floor and walls and I learned from my husband, who stayed at home longer in the morning, that something in the radiators was buzzing for a while , it whistled, then our two radiators air a little and my husband vented them again. So far, the radiators don't seem to be dripping, but it's hard for me to say if it's not temporary, because we've just returned home.

Hello after a few days.
Continuation of my struggle with the cooperative. We are back to where we started - the noise in the radiators. I was just talking to one of the experts I had to call again. Apparently, after reducing the pressure in our country and trying to muffle the sounds I reported (dripping, whistling) in the next cage, the heating stopped working and the gentlemen had to set the pressure, so to speak, "primary", the ones that they always turn on at the beginning of the heating season, and which then have to reduce . The effect is that I am now happily in my apartment, because, and yes, nothing is dripping or whistling, because the noise that comes from the radiators (even in the first position of the thermostat, i.e. turning off the heating) effectively drowns out everything. And apparently it must stay this way until frost ... Nothing can be done. When I suggested installing a flow regulator or installing a pump with smooth regulation, you said that I read nonsense on the Internet and that it would not work. Is there something right in what the "experts" say, because I am starting to doubt my own mental health ...
I have the impression that I found myself in Bareja's film ...

Hello, I live on the second, top floor of a multi-family single-staircase building. There is a central heating oven in the basement. 4 years ago, I replaced the installation with copper and aluminum radiators. This year, the cooperative replaced the gas furnace and it started. In one room - although it is on the second floor, it is the first radiator in the vertical, the neighbors downstairs have a radiator on the opposite side - you can hear the water overflowing - as if water was constantly being poured into the flush. When I turn the valve on 2, it is quiet, but cold. At night it is unbearable. The radiator has an automatic air vent, there is also an air vent on the riser. I am asking for advice. The cooperative says there is no problem and I'm losing my mind.

and was the coal boiler installed in an open system? because probably the gas one is in a closed system ... the fact is that the disadvantage of aluminum radiators is the pump noise that can be heard in them. a closed system has a pressure in it. and therefore the noise is louder than in an open circuit. you are right in saying that after screwing on the radiator, it makes less noise. because the flow through this heater changes automatically. to eliminate this, you can try to reduce the pump power in the gas boiler, but it may result in not heating up the highest and farthest sections of the installation.
greetings

The installation works in a closed system. Apparently, such phenomena are only in my apartment, everything is fine in the other blocks, and the stoves were replaced everywhere. Experts from the cooperative say that it is the fault of my installation in the apartment, my hands are dropping, out of nowhere to help. He doesn't even want to let the plumber I hire into the boiler room.

in the remaining blocks, the pipes were also replaced with copper and are there also aluminum radiators?

Added after 4 [minutes]:

your installation may be a problem. because it is not known how it is made. I don't know if the radiators are air-tight, because I haven't seen this installation ..; /

mariolka1435 wrote:

you can hear the water overflowing - as if water was constantly being poured into the cistern

It was the same with me. It helped to unscrew the valve on the radiator to max. Previously, I turned off the heater for the night like you - it was a bit colder in the apartment, but quiet - and I did not feel it under the warm duvet.

Only that if it is an ordinary valve with a mushroom head, the o-ring of the valve will leak after some time of shooting; /. And if the thermostat is less of an evil.

In other blocks, no one mentioned the installation. For me, nothing happened to install a new furnace, the furnace was installed in December this year. I have automatic vents on the radiators, such "pipes" at the end of the radiator, Danfos valves and an automatic air vent on the riser.

Do you have return valves on the radiator? What "pipes" are we talking about? Can you take a picture of it? So what is a gas boiler? Because it is also possible that it has a more powerful circulation pump than the previous carbon pump. And that can cause noise and knocking.

These are automatic vents. Afriso, as it is, I don't know, the secret of the cooperative, the boiler room is closed. Or maybe this vent broke ?????

I doubt it would be a vent. I will say this. Turn off the stove when venting. So that the pump does not run. Close the supply valve. And then vent. After several venting times, unscrew the power supply to the heater and vent again. And after that, start the boiler. Because when the boiler is working, the pump constantly dissipates the water with the air. And there is no strength to bleed the radiator in this case.

Wojtek, thank you very much! I will go with what you wrote to the cooperative, let the installation bleed according to your recommendations

You're welcome write later on the forum what you won

Hello, yesterday the cooperative vented the furnace in the boiler room, today it was decided to install air separators in the boiler room. We will see how it will be.