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Loud Water Hammer Everywhere
I am new to this forum. I purchased a house a little over a year ago built in 1920 with a single pipe system boiler and steam radiators. I have a Utica Boiler.
Work I have done: Replaced two main vents with Gorton #1 valves. Replaced all air vents on radiators with Hoffman #40. Replaced two bedroom radiators with 1.25" steam radiator valves. Pitched and shimmed all radiators to steam valve. Checked/verified slope of all piping in basement to boiler return. Eye glass is water is clear.
The issue: We are getting VERY loud water hammer in one of our bedroom radiators as well as several others. The upstairs radiators sound like they have water bubbling in them. I have no clue what is happening and seeking professional advise. I have been using a local plumbing contractor who seems familiar with steam but this issue has not been solved. Two thoughts I have....The supply pipes to the upstairs radiators are in the exterior walls with no insulation, could the water be condensing quickly and causing the water hammer? The other concern I have is the contractor said my nbp is incorrect, could the piping having anything to do with throwing water into the system at start up?
Please help! I have a baby on the way and the nursery is the loud radiator! also our guests can barely sleep in the guest room. Photo attached of nbp.
-Chris (Annapolis MD)