Water pipe sizing charts

Discussion in 'IPC Plumbing Code Questions' started by rtrout, Nov 13, 2013.

  1. rtrout

    rtrout New Member

    Nov 13, 2013
    I am not completely new to the IPC and the selection of water supply sizing. But today figures have given me some confusion in the IPC charts. 2009 IPC table E201.1. Let me give some examples. 50-60 psi chart, max developed length = 250'. figure meter and service pipe column. 14.5 fixture units = 3/4" pipe, 16.5 f.u. = 1" pipe, now 32 f.u. = 3/4" pipe. What?? More fixture units = smaller pipe size. This is the confusion. Now look at the 250' MDL. 87, 139 and 146 f.u. = 1-1/2" pipe in the distribution pipe column, then it goes back to 87 f.u. with 2" pipe. What is the deal? Why the jump around and change in f.u. and pipe size? Why is the 87 f.u. row list twice with different pipe sizes? I can further show the confusion with the 40', 60', 80' MDL with 32 f.u. and the various sizes under both columns to the left. Can any one help clear this up. My brain is making funny noises.
  2. dhagin

    dhagin builder:anti-builder

    Jan 22, 2014
    Have you checked the errata for the code to see if there's misprints? Don't have that book so can't look it up for ya.
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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington

    UPC chart for pipe sizing.
    Last edited: Jan 24, 2021
  5. hj

    hj Master Plumber

    Aug 31, 2004
    Cave Creek, Arizona
    Has anyone ever said the IPC was "logical"? If you have a problem, then just submit a change request and the problem goes away.
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