##### Asked by: Ramil Vallath

asked in category: General Last Updated: 1st March, 2020# How do you convert drainage fixture units to GPM?

**How to Convert DFU to GPM**

- Locate the Uniform
**Plumbing**Code (UPC) for your state. - Locate the
**drainage fixture unit**rating for your device or system in the UPC. - Divide the
**drainage fixture unit**rating by 2 to get the**gallons per minute**of flow for your device or system.

Moreover, how many GPM is a fixture unit?

The relationship between gallons per minute (gpm) and fixture unit is not constant, but varies with the number of fixture units. For example, 1000 FU is equivalent to **220 gpm**, but 2000 FU is not double that, but is only 1.5 times as much, or **330 gpm**.

Similarly, how many fixture units can a 2 inch drain handle? 710.1 Maximum fixture unit load

DIAMETER OF PIPE (inches) | MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu) | |
---|---|---|

2 | 6 | 24 |

2^{1}/_{2} | 12 | 42 |

3 | 20 | 72 |

4 | 160 | 500 |

Thereof, how are drain fixture units calculated?

A **fixture unit** is equal to one cubic foot of water drained in an 1 1/4 pipe over one minute (≈ 7.48 US gpm, ≈ 0.47 l/s). **Fixture Units** are used in plumbing design for both water supply (WFSU) and waste water (DFU).

How many fixture units is a floor sink?

709.1 Values for Fixtures

FIXTURE TYPE | DRAINAGE FIXTURE UNIT VALUE AS LOAD FACTORS | MINIMUM SIZE OF TRAP (inches) |
---|---|---|

Floor drains^{h} | 2^{h} | 2 |

Floor sinks | Note h | 2 |

Kitchen sink, domestic | 2 | 1^{1}/_{2} |

Kitchen sink, domestic with food waste disposer and/or dishwasher | 2 | 1^{1}/_{2} |