dfu to gpm conversions

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    • #279024
      Avatar photoMasterPlumbers

        I know there are curves in ASPE books that show how to convert from dfu to gpm, but are there any actual formulas on how to do this? How did they create those curves?

      • #299818
        Avatar photoSylvanLMP

          If your DFU is drainage fixture units all you need to know is the following.

          1 GPM pumped drainage (continuous flow) is considered an FU

          A three square feet of roof drainage is also considered a fixture unit

          When combining a drainage and storm system you must do interpolation to properly size the piping.

          Some codes also go by pitch of pipe to allow more or less FU’s and venting fixture units if properly sized also take developed length into consideration.
          All of these can be memorized with just a little effort.


          » This message has been edited by Lorenzo on 17 September 2001

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