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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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Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


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