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Very strange whistling radiators problem
It's been a long time since I posted.. Encountered a very strange problem in my apartment the last 2 days.
Background: I am in a 5 story TWO-PIPE steam heat condo, with TRVs on each radiator. I am the one who has managed the boiler over the last 8 years or so.
So here's the problem -- I started hearing a constant whistle a few days ago.. Which has gotten louder over the last couple of days.
It's a little hard to pinpoint the source of the whistle but it SEEMS to me to be coming near the top where the TRV is.
BUT here is where it gets reallllly strange. Today I believe the whistle is happening on BOTH this dining room radiator, AND the one in the room next door now. BOTH seem to be whistling. I am flumoxed to figure out how this could be...
More strangeness: Turning on or off the valve does *NOT* effect the whistle. Neither does my attempt to put a towel over different areas to try to find where the sound is coming from by dampening different areas..
I am at a loss to explain these symptoms.
Both radiators are fed from a common supply line under the floor. The only thing I can think of is that there is some leak in the supply line causing the whistles and that somehow even though it sounds to me when I put my ear up against the radiators that the sound is localized near the inlet pipe, that really the "source" of the whistling is the common supply line under the floor a few feet away?
Or is it somehow possible that TWO radiators are suddenly whistling at the same time after 8 years of nothing?
Anyone have any theories?
To recap some basic stats:
1. Two-pipe steam
2. TRVs on both radiators, both supplied from same supply ine
3. Boiler pressure is good, under 2.5 pounds
4. Traps and TRVs are about 8 years old.
5. Problem just started a few days ago -- started out quieter and only in one room, now louder and more constant and seeming to come from 2 dif radiators..
Feel like I am losing my mind...