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Odd steam problem

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?

Comments

  • kcopp
    kcopp Member Posts: 4,501
    Well we...

    would love pictures...... Is the piping insulated? There could be a lot of junk still in the system. How long did you flush the system and how long did you skim? The chemicals could work against you.... Not to insult you but, you followed the manual diagrams, right? What make and model?
  • Steamhead
    Steamhead Member Posts: 17,550
    Does the system have any vacuum vents?

    I've seen these things hold water up in the system and cause banging. 
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
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