4" Main Drain Line Capacity?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by molo, Jan 10, 2009.

  1. molo

    molo Member

    Joined:
    Sep 23, 2006
    Location:
    Cold New York
    My question is how much capacity is a 4" pvc line capable of handling? I've seen 4" lines going out of apt. buildings, and am wondering what their capacity is.

    Thanks for any replys!
     
  2. GabeS

    GabeS Remodel Contractor

    Joined:
    Jan 10, 2007
    Occupation:
    Remodel contractor
    Location:
    Brooklyn NY
    There are plumbing charts that you can google that tell you all that fun information.
     
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  4. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Joined:
    Nov 20, 2008
    Occupation:
    Chicago Illinois Licensed Plumber
    Location:
    Chicago, IL
    In Illinois it is a max of 500 fixture units on a 4" pipe. Which is more than enough for most apartment buildings.
     
  5. molo

    molo Member

    Joined:
    Sep 23, 2006
    Location:
    Cold New York
    That's a lot
     
  6. Redwood

    Redwood Master Plumber

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    Dec 15, 2007
    Occupation:
    Service Plumber
    Location:
    Connecticut
  7. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    capacity

    You will notice in the chart one peculiarity of geometry. At almost all points on the chart a 4" pipe has approximately twice the capacity of a 3" line.
     
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