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2 pipe / 1 pipe steam on the same system

Daniel_3 Member Posts: 543
There are two-pipe set-ups that served as a supply/condensate return for a one-pipe system. If the rads were still in place you would most likely find vents on those rads with the two pipes. What size are the two pipes? If you follow those pipes you might find one go directly into a wet return or into a steam syphon on the main. I know Dan had reviewed such a situation somewhere about this. I know it wasn't a common occurance as well. Any traps or pumps in the boiler room?

Look up "two pipe, air vent steam heating" in the hot tech topics in "resources" and you'll find more info.


  • 2 pipe / 1 pipe steam sharing the same boiler

    I am reviewing a boiler swap for a clienat that has an opld steam system in a 2 story victorian home. The odd fact is that this boiler serves a 2 pipe system in the front 1st floor and single pipe everywhere else. This is your typical remodeled home, radiators removed and lines capped... Has anyone run into this combination of 2 and 1 pipe steam before? Another interesting note is that there are no steam traps on the 2 pipe radiators
    JIm Patterson- OVHC
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