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jonny23jonny23 Posts: 19Member
Having my steam boiler replaced. This is a one pipe, parallel flow (I believe), gravity return system. Right now there is a single system riser which connects to a tee that then feeds the mains to the left and right. Several contractors have come to look at the job. Some suggested 2 separate takeoffs to feed the left and right main separately OR a single system riser that splits into a Y. Is this correct and can someone explain what the need for this is?


    Bullhead T

    What could potentially happen with the current setup is that the steam and condensate that hits the back of the T can bounce back toward the boiler and cause pressure and water fluctuation problems. My hands are getting tired from beating the drums but the most important thing is to hire a competent installer who knows how to size boiler by measuring radiators and how to properly install the boiler and connected piping.
  • JStarJStar Posts: 2,668Member

    Agreed. You want to eliminate any bullheaded tees.

    You also want to have each main supplied from its own pipe off the header. This will ensure proper distribution, and low steam velocity, which means greater water/steam separation. Dry steam is happy steam.
  • Jamie HallJamie Hall Posts: 10,026Member
    Perhaps a little clearer...

    The setup you really want to have is a header pipe (preferably a drop header; see "The Lost Art of Steam Heating" for more information; if you don't have the book, it's worth getting -- see the "Shop" tab).  This is a larger diameter pipe (a size or two, at least, larger than the riser(s) ) which is almost -- but not quite -- horizontal.  Starting at the high end, you connect -- in this order -- one or two risers from the boiler (probably just one -- but look at, read, and follow the instructions for the boiler), then two takeoffs, one for the left main and one for the right main.  Then, at the low end, the equalizer connection back to the wet return for the boiler.

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
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