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Drainage Fixtures - Unit Loads and Sanitary Piping

Maximum Drainage Fixture Unit - DFU - loads for sanitary piping

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Maximum Drainage Fixture Units - Stacks and Horizontal Fixture Branches

Maximum Drainage Fixture Units (DFU)
Pipe SizeHorizontal fixture branchStacks less than three stories in heightStacks more than three stories high
NPS
(inches)
DN
(mm)
Total for stackTotal for one story
1 1/20) 40 3 4 8 2
20) 50 6 10 24 6
2 1/20) 65 12 20 42 9
3 80 201) 481) 722) 201)
4 100 160 240 500 90
5 125 360 540 1100 200
6 150 620 960 1900 350

0) No water closet permitted

1) Maximum two water closets

2) Maximum six water closets

Maximum Drainage Fixture Units - Building Drains and Building Drain Branches from Stacks

Maximum Drainage Fixture Units (DFU)
Pipe SizeSlope (in/ft (cm/m))
NPS
(inches)
DN
(mm)
1/4 (2.1)1/2 (4.2)
20) 50 21 26
2 1/20) 65 24 31
3 80 421) 501)
4 100 216 250
5 125 480 575
6 150 840 1000
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  • Engineering ToolBox, (2008). Drainage Fixtures - Unit Loads and Sanitary Piping. [online] Available at: https://www.engineeringtoolbox.com/drainage-fixture-units-piping-load-d_1078.html [Accessed Day Mo. Year].

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