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Odd steam problem

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jjplumber
jjplumber Member Posts: 2
in THE MAIN WALL
Just replaced gas steam boiler (residential), sized boiler by sq ft of steam based on radiator sizing. Full 3" dual header with expansion loop connecting to two separate distribution mains. System was banging and upon inspection, looked like system was surging and throwing water into mains. Boiler was skimmed at installation and re-skimmed today. Added steam clean to system but with no avail. The odd thing that happened was when we shut boiler down, it started banging again and we opened boiler drain (on boiler) the system was in a vacuum and sucked air in and then started to drain. ANY SUGGESTIONS?

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  • Jason Quinn
    Jason Quinn Member Posts: 96
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    The system

    water may still be dirty. Are the mains pitched properly and insulated? Are you sure near boiler piping is to manufacturers specs along with the Hartford Loop connection?
  • furnacefigher15
    furnacefigher15 Member Posts: 514
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    Venting may be part of the problem

    Under vacuum indicates to me a possible venting problem.



    If the vents work, then air should have already been in the system. Also as Jason pointed out, may also be a pitching / water trapping issue and or a lack of a hartford loop.
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