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// CODE SNIPPET

710.1 Maximum Fixture Unit Load

Plumbing Code 2018 of Kansas > 7 Sanitary Drainage > 710 Drainage System Sizing > 710.1 Maximum Fixture Unit Load
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The maximum number of drainage fixture units connected to a given size of building sewer, building drain or horizontal branch of the building drain shall be determined using Table 710.1(1). The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using Table 710.1(2).
TABLE 710.1(1)
BUILDING DRAINS AND SEWERS
DIAMETER OF
PIPE (inches)
MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS
CONNECTED TO ANY PORTION OF THE BUILDING

DRAIN OR THE BUILDING SEWER, INCLUDING
BRANCHES OF THE BUILDING DRAINa
Slope per foot
1/16 inch1/8 inch1/4 inch1/2 inch
11/4——11
11/2——33
2——2126
21/2——2431
3—364250
4—180216250
5—390480575
6—7008401,000
81,4001,6001,9202,300
102,5002,9003,5004,200
123,9004,6005,6006,700
157,0008,30010,00012,000
For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.3 mm/m.
  1. The minimum size of any building drain serving a water closet shall be 3 inches.
TABLE 710.1(2)
HORIZONTAL FIXTURE BRANCHES AND STACKSa
DIAMETER OF
PIPE (inches)
MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS
(dfu)
Total for
horizontal
branch
Stacksb
Total
discharge

into one

branch
interval
Total for stack
of three

branch

Intervals or
less
Total for stack
greater than

three branch
intervals
11/23248
2661024
21/21292042
320204872
416090240500
53602005401,100
66203509601,900
81,4006002,2003,600
102,5001,0003,8005,600
123,9001,5006,0008,400
157,000Note cNote cNote c
For SI: 1 inch = 25.4 mm.
  1. Does not include branches of the building drain. Refer to Table 710.1(1).
  2. Stacks shall be sized based on the total accumulated connected load at each story or branch interval. As the total accumulated connected load decreases, stacks are permitted to be reduced in size. Stack diameters shall not be reduced to less than one-half of the diameter of the largest stack size required.
  3. Sizing load based on design criteria.

710.1.1 Horizontal Stack Offsets

Horizontal stack offsets shall be sized as required for building drains in accordance with Table 710.1(1), except as required by Section 711.3.

710.1.2 Vertical Stack Offsets

Vertical stack offsets shall be sized as required for straight stacks in accordance with Table 710.1(2), except where required to be sized as a building drain in accordance with Section 711.1.1.

Related Code Sections


710.1 Sanitary Drainage, Maximum Fixture Unit Load
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