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// CODE SNIPPET

703.2 Maximum Number of Fixture Units

California Plumbing Code 2016 > 7 Sanitary Drainage > 703.0 Size of Drainage Piping > 703.2 Maximum Number of Fixture Units
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Table 703.2 shows the maximum number of fixture units allowed on a vertical or horizontal drainage pipe, building drain, or building sewer of a given size; the maximum number of fixture units allowed on a branch interval of a given size; and the maximum length (in feet and meters) of a vertical drainage pipe of a given size.

TABLE 703.2
MAXIUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING
SIZE OF PIPE (inches) 11/4 11/2 2 3 4 5 6 8 10 12
Maximum Units
Drainage Piping1
Vertical
Horizontal


1
1


22
1


163
83


484
354


256
2165


600
4285


1380
7205


3600
26405


5600
46805


8400
82005
Maximum Length
Drainage Piping
Vertical, (feet)
Horizontal (unlimited)


45


65


85


212


300


390


510


750
- -
Vent Piping
Horizontal and Vertical6
Maximum Units
Maximum Lengths, (feet)


1
45


83
60


24
120


84
212


256
300


600
390


1380
510


3600
750
- -
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

Notes:
1   Excluding trap arm.
2   Except sinks, urinals, and dishwashers - exceeding 1 fixture unit.
3   Except six-unit traps or water closets.
4   Only four water closets or six-unit traps allowed on a vertical pipe or stack; and not to exceed three water closets or six-unit traps on a horizontal branch or drain.
5   Based on 1/4 inch per foot (20.8 mm/m) slope. For 1/8 of an inch per foot (10.4 mm/m) slope, multiply horizontal fixture units by a factor of 0.8.
6   The diameter of an individual vent shall be not less than 11/4 inches (32 mm) nor less than one-half the diameter of the drain to which it is connected. Fixture unit load values for drainage and vent piping shall be computed from Table 702.1 and Table 702.2(2). Not to exceed one-third of the total permitted length of a vent shall be permitted to be installed in a horizontal position. Where vents are increased one pipe size for their entire length, the maximum length limitations specified in this table do not apply. This table is in accordance with the requirements of Section 901.3.
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