4" Main Drain Line Capacity?

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

  1. molo

    molo Member

    Messages:
    845
    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

    Messages:
    294
    Location:
    Brooklyn NY
    There are plumbing charts that you can google that tell you all that fun information.
  3. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Messages:
    1,705
    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.
  4. molo

    molo Member

    Messages:
    845
    Location:
    cold new york
    That's a lot
  5. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,690
    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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