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Adding main vents where there none atm

Our new heater is up and running fine. Install thread here: https://forum.heatinghelp.com/discussion/185857/new-steam-boiler-install#latest
I’m now in the process of getting it balanced. The only vent at the moment is on the condensate return. There was a Hoffman No. 4 that was shot so I bought a Gorton #2. It was too big for the current vent so I returned it and bought a Dole No. 4 which is basically a Hoffman but has 3 vent holes as opposed to the Hoffman’s 1. Seems to be venting just fine.
My question is:
There are currently no vents and the ends of the mains. Should I try to install one if I can?
The one main has a tee and a 90° for the final radiator takeoff. Would it be beneficial to change the 90° to a tee and install a vent there. The other main is behind a finished wall and I’m not too thrilled about tearing into it there would be no benefit.
Some photos:


After the radiator takeoff the main drops down into the wet return .

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 23,275
    The idea of a T where you have circled and adding a vent there is a good idea. However. Unless there is a handy union somewhere nearby, it could be a real job...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Steamhead
    Steamhead Member Posts: 16,830
    Where is that Dole #4 installed on the system? Post a pic. Also, is this a one-pipe or two-pipe system?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • mygardenshed
    mygardenshed Member Posts: 51

    The idea of a T where you have circled and adding a vent there is a good idea. However. Unless there is a handy union somewhere nearby, it could be a real job...

    There is a union on the radiator piping. As you can see there’s not enough room for a very large vent.
  • mygardenshed
    mygardenshed Member Posts: 51
    edited December 2021
    Steamhead said:

    Where is that Dole #4 installed on the system? Post a pic. Also, is this a one-pipe or two-pipe system?

    Two pipe system. Seems to be running at a nice pressure.
    The other day I went through the radiators one by one, system off of course, and removed each trap cage and cleaned the trap base. While the cages were out I gave them a good wipe down and heated them up with a heat gun and made sure they were opening and closing. Also while the trap was open I sent a shot of compressed air down the condensate line via the port at the base of the trap to be sure there are no obstructions.
    Discovered one trap that’s suspicious. I think it’s in the pipe leading from the trap and into the return. Replacing the piping shouldn’t be too bad as it’s exposed in the basement.


  • mygardenshed
    mygardenshed Member Posts: 51
    edited December 2021
    Follow up question is if I install a vent at the location discussed above and not install one at the end of the other main will this lead to an imbalance? I’m thinking yes.
    I may install one and if it creates trouble due to an imbalance I can always put a pipe plug in it’s place.
    Thanks
  • Hap_Hazzard
    Hap_Hazzard Member Posts: 2,846
    When I discovered I had no main vents a few years back, I installed the biggest vents I could find on the last radiator on each branch as an interim measure. A "D" radiator vent is as fast as a #1 main vent. Unless that radiator happens to be right next to your thermostat, you might give that a try.
    Just another DIYer | King of Prussia, PA
    1983(?) Peerless G-561-W-S | 3" drop header, CG400-1090, VXT-24