Water Hammer

Lurker_2

Definitely you want the main venting; that's a big deal.

With regard to the overfilling, that's a lot of additional weight being added to the pipes -- definitely more than intended. I'd check the pitch on all the pipes (as well as the radiators) to make sure that extra weight didn't cause any unexpected sags or reverse pitches and so forth. And also, yes, that amount of water floating around in the radiators probably unearthed a bunch of junk, so you might want to flush them a bit.

-Michael

Paul K

Water Hammer

I bought a 2 family home 2 months ago. The home is 105 years old with a 2 year old Weil Mclain oil boiler. Water hammer just started this year according to tenant upstairs. Shes been there ten years. Only thing changed is my plumber put auto water feed on system and water is being filled about 2-3 inches over recommended line. He explains why is system is feeding itself when gets low but there is some water in lines when sytem is off which feeds back in system. They say its ok. Shouldnt cause water hammer in lines. Other thing I just learned is last year owner overfilled system when refilling, enough that water was coming out of 2nd floor radiators. Should lines need to be flushed out. Plumber at this point recommended making sure all radiators are pitched correctly which I have done and installing a air vent on main steam line. Any help would be appreciatted.
Paul

Bob Schultz

My old house

Had this problem. The autofeed would occasionally put too much water in when it called for water. When it was overfilled I would get a hammer. I am no proffesional but this is what I did and it has worked like a charm for the last 2 years. There is a water shut off just before the auto filler, I turned it down (not all the way off but close) so when the auto filler called for water it didn't give a big gush of water. Give that a try.
Ted