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702.0 Fixture Unit Equivalents
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The unit equivalent of plumbing fixtures shown in Table 702.1 shall be based on the size of the trap required, and the unit equivalent of fixtures and devices not shown in Table 702.1 shall be based on the size of trap or trap arm.
Maximum drainage fixture units for a fixture trap and trap arm loadings for sizes up to 4 inches (100 mm) shall be in accordance with Table 702.1(1).
|PLUMBING APPLIANCES, APPURTENANCES, OR FIXTURES||MINIMUM SIZE TRAP AND TRAP ARM7 (inches)||PRIVATE||PUBLIC||ASSEMBLY8|
|Bathtub or Combination Bath/Shower||11/2||2.0||2.0||—|
|Clothes Washer, domestic, standpipe5||2||3.0||3.0||3.0|
|Dental Unit, cuspidor||11/4||—||1.0||1.0|
|Dishwasher, domestic, with independent drain2||11/2||2.0||2.0||2.0|
|Drinking Fountain or Water Cooler||11/4||0.5||0.5||1.0|
|Food Waste Disposer, commercial||2||—||3.0||3.0|
|Floor Drain, emergency||2||—||0.0||0.0|
|Floor Drain (for additional sizes see Section 702.0)||2||2.0||2.0||2.0|
|Shower, single-head trap||29||2.0||2.0||2.0|
|Multi-head, each additional||2||1.0||1.0||1.0|
|Lavatories in sets||11/2||2.0||2.0||2.0|
|Mobile Home, trap||3||12.0||—||—|
|Receptor, indirect waste1, 3||11/2||See footnote1, 3|
|Receptor, indirect waste1, 4||2||See footnote1, 4|
|Receptor, indirect waste1||3||See footnote1|
|Commercial with food waste2||11/2||—||3.0||3.0|
|Kitchen, domestic2 (with or without food waste disposer, dishwasher, or both)||11/2||2.0||2.0||—|
|Laundry2 (with or without discharge from a clothes washer)||11/2||2.0||2.0||2.0|
|Service or Mop Basin||2||—||3.0||3.0|
|Service or Mop Basin||3||—||3.0||3.0|
|Service, flushing rim||3||—||6.0||6.0|
|Wash, each set of faucets||—||—||2.0||2.0|
|Nonwater Urinal with Drain Cleansing Action||2||1.0||1.0||1.0|
|Urinal, integral trap 1.0 GPF2||2||2.0||2.0||5.0|
|Urinal, integral trap greater than 1.0 GPF||2||2.0||2.0||6.0|
|Urinal, exposed trap2||11/2||2.0||2.0||5.0|
|Water Closet, 1.6 GPF Gravity Tank6||3||3.0||4.0||6.0|
|Water Closet, 1.6 GPF Flushometer Tank6||3||3.0||4.0||6.0|
|Water Closet, 1.6 GPF Flushometer Valve6||3||3.0||4.0||6.0|
|Water Closet, greater than 1.6 GPF Gravity Tank6||3||4.0||6.0||8.0|
|Water Closet, greater than 1.6 GPF Flushometer Valve6||3||4.0||6.0||8.0|
For SI units: 1 inch = 25 mm
1 Indirect waste receptors shall be sized based on the total drainage capacity of the fixtures that drain thereinto, in accordance with Table 702.2.
2 Provide a 2 inch (50 mm) minimum drain.
3 For refrigerators, coffee urns, water stations, and similar low demands.
4 For commercial sinks, dishwashers, and similar moderate or heavy demands.
5 Buildings having a clothes-washing area with clothes washers in a battery of three or more clothes washers shall be rated at 6 fixture units each for purposes of sizing common horizontal and vertical drainage piping.
6 Water closets shall be computed as 6 fixture units where determining septic tank sizes based on Appendix H of this code.
7 Trap sizes shall not be increased to the point where the fixture discharge is capable of being inadequate to maintain their self-scouring properties.
8 Assembly [Public Use (see Table 422.1)].
9 For a bathtub to shower retrofit, a 11/2 inch (40 mm) trap and trap arm shall be permitted with a maximum shower size of 36 inches (914 mm) in width and 60 inches (1524 mm) in length. See Section 408.5 and Section 408.6.
|SIZE OF TRAP AND TRAP ARM (inches)||DRAINAGE FIXTURE UNIT VALUES (DFU)|
For SI Units: 1 inch = 25 mm
* Exception: On self-service laundries.
Drainage fixture units for intermittent flow into the drainage system shall be computed on the rated discharge capacity in gallons per minute (gpm) (L/s) in accordance with Table 702.2.
|Up to 71/2||Equals 1 Fixture Unit|
|Greater than 71/2 to 15||Equals 2 Fixture Units|
|Greater than 15 to 30||Equals 4 Fixture Units|
|Greater than 30 to 50||Equals 6 Fixture Units|
For SI units: 1 gallon per minute = 0.06 L/s
* Discharge capacity exceeding 50 gallons per minute (3.15 L/s) shall be determined by the Authority Having Jurisdiction.
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