Sizing Drain Piping with DFU and Continuous or …

Sizing Drain Piping with DFU and Continuous or Semi- Continuous Flow By Anjian Lu, CPD, LEED AP This article was written to start a discussion on Sizing Drain Piping with both drainage fixture units (DFU) and Continuous or semi- Continuous flow in gallons per minute (gpm). By reviewing major plumbing codes in the United States and the Manning formula, the author raises some questions and suggests some conversion factors between DFU and gpm. The conversion factors calculated and suggested are solely based on the International Plumbing Code (IPC). Sometimes we need to size a Drain receiving both DFU from plumbing fixtures and Continuous or semi- Continuous flow in gpm from a pump or other piece of equipment. In such cases, we need to convert either DFU to gpm or gpm to DFU. Though according to the major plumbing codes, 1 gpm ( L/s) of Continuous or semi- Continuous flow is equivalent to two fixture units,1, 2, 3, 4, 5, 7 you must take caution in applying this rule.

Sizing Drain Piping with DFU and Continuous or Semi-Continuous Flow By Anjian Lu, CPD, LEED AP This article was written to start a …

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