Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Is this a main line steam vent of some kind

Here are some pic's of a piece on the condensate  return line, 


    EBEBRATT-Ed Member Posts: 8,853
    You need to stand farther back so we can see. That looks like a boiler return trap. The street elbow on top is your air vent. I see some cross over traps.

    That is a vapor system. What problems are you having? You have to run that at very low pressure.

    Others that know more about vapor will comment @Jamie Hall
  • Jamie Hall
    Jamie Hall Member Posts: 15,742
    I'll comment quite happily -- when I can see more of the system. And get a better idea of what is connected to what...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    JUGHNE Member Posts: 8,264
    Floor to ceiling shots of piping, several sides would be good.
  • Steamhead
    Steamhead Member Posts: 14,424
    edited February 26
    Might be an air trap rather than a return trap. There may have been a check valve installed in that street 90 to hold vacuum, which worked quite well when the system was coal-fired.

    Have you found any manufacturers' info on that unit, or anything else on that system? Where is this system located?
    All Steamed Up, Inc.
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!