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Lots of thermal expansion?
Over the past few weeks I've noticed something rather strange going on with my single pipe steam system. When it kicks on I get lots of what sounds like thermal expansion. Not the normal pop or two, but clangs throughout the entire house that almost seem random. It lasts for the first 5-10 minutes. "Pop...pop.pop....pop........pop" all from different radiators. I have never had this much of it before and I'm not really sure what to do. I thought through checking the level of each radiator, but it seems strange that 6-8 radiators would all of the sudden start a random chorus of thermal expansion clanging.
An interesting note - it appears to only happen on 1 side of the house. I do have 2 steam lines - 1 serving the front of the house and another serving the rear. I don't think I've heard it at all on the rear.
I did recently have a pro out to help look at some water hammering. We think it's happening because the floor has sagged where the main lines return. The pro did mess around some under the house but said he didn't really do anything. I double checked the pressure to make sure he didn't mess with it, still running at 1.5psi.
I did switch from some new (larger) main vents back to the original smaller ones (after I cleaned them up). The water hammer from the old ones was so intense I started to get worried. I'll swap them back once I get the sagging floor fixed.
Any ideas on the new thermal expansion issue? I probably get 25-30 clangs over 5 minutes. Seems excessive and new.
Thanks in advance!