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Drainage Fixture Units (DFU) connected to building drains and sewers.
Note! - charts are based on clean pipes. Friction coefficients may vary with pipe material.
Drainage Fixture Unit Values (DFU) are defined by the Uniform Plumbing Code (UPC) and can be used to determine required drainage capacities from fixtures and service systems.
The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.
Dimensions of cast iron soil pipes.
Cleanouts provides access to the sewer for rodding.
DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.
Drain pipes and vent stack sizing.
Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .
Recommended drain trap sizes for different types of fixtures
Minimum pitch of horizontal drainage pipes.
Calculate expected volume flow load in sanitary drainage systems.
Drainage Fixture Unit - DFU - loads in sanitary piping systems.
Septic systems handles waste from drain systems.
Carrying capacities of sewer and wastewater pipes -
gpm and liter per second.
No. of fixture units and required trap size.
Converting WSFU - Water Supply Fixture Units - to GPM.
WSFU is used to calculate water supply service systems.
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Drains and Sewers - Capacities vs. Size. [online] Available at: https://www.engineeringtoolbox.com/building-drains-sewers-fixture-units-slope-d_1737.html [Accessed Day Month Year].
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