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Near Boiler Piping Sizes ?

I have a new steam Weil McLain EG50. The recommended minimum sizes for supply riser, header, and equalizer are either:

2 inch - 2 inch - 1.5 inch


2.5 inch - 2.5 inch - 1.5 inch

My pro used

3 inch - 2 inch - 2 inch

I have read that it is okay to upsize the riser and equalizer, but I cannot find anything in the books that talk about the relationship of the header size to the riser size.

The linear distance from the center of the riser to the center of the upfeed tee [which goes out of the header to the main] is about 10 inches (included in this run is a 30 degree elbow).

My pro has used this design successfully, often.

I just would like to know what the riser to header size relationship usually is?



  • Paul Fredricks_3
    Paul Fredricks_3 Member Posts: 1,557

    The relationship to each other is not important. What matters is that they are big enough to allow any water to fall out of the steam. What you are describing sounds fine.
  • Steam Velocity

    Read Page 42 + in "The Lost Art..." regarding steam velocity. The larger pipe coming out of the boiler slows the steam's velocity and as Paul mentioned, the lower velocity steam can't carry as much water with it and the water falls out and  back into the boiler. This results in dryer steam. Keep in mind that the configuration of the near boiling piping is mainly devoted to preventing the dreaded "Wet Steam"

    - Rod
  • SteamHeat
    SteamHeat Member Posts: 159
    Thanks For The Ongoing Education

    I am just trying to check everything that I can.  I truly appreciate all the help.
  • Unknown
    edited December 2009
    Boiler Piping

    If you really want to see how headers should be done, go to Gerry Gill's Website  [url=http://www.gwgillplumbingandheating.com/ ]http://www.gwgillplumbingandheating.com/  and look at his Steam Installation Pictures. Note the increase in size of the risers (slows the velocity) as they come out of the boiler. Gerry & Steve's dropheaders aren't just piping, they are an art form!

    - Rod
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