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Drains and Sewers - Capacities vs. Size

Drainage Fixture Units (DFU) connected to building drains and sewers.

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Note! - charts are based on clean pipes. Friction coefficients may vary with pipe material.

The 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.

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Related Topics

Sanitary Drainage Systems - The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.

Related Documents

DFU - Drainage Fixture Units - DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.
Cast Iron Soil Pipes - Dimensions - Dimensions of cast iron soil pipes.
Cleanouts in Draining Systems - Cleanouts provides access to the sewer for rodding.
Drain Pipes and Vent Stacks - Drain pipes and vent stack sizing.
Draining Systems - Main Vents - Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .
Fixtures and Trap Sizes - Recommended drain trap sizes for different types of fixtures
Horizontal Drainage Pipe - Required Slopes - Minimum pitch of horizontal drainage pipes.
Sanitary Drainage Systems - Volume Flow - Calculate expected volume flow load in sanitary drainage systems.
Sanitary Piping - Drainage Fixtures Unit Loads - Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.
Septic Systems - Septic systems handles waste from drain systems.
Sewer Pipes - Capacities vs. Slope - Carrying capacities of sewer and wastewater pipes - gpm and liter per second.
Trap Size vs. Fixture Units - No. of fixture units and required trap size.
Water Supply Fixture Units - WSFU vs. GPM and Liters/sec - Converting WSFU - Water Supply Fixture Units - to GPM.
Water Supply Fixture Units WSFU - WSFU is used to calculate water supply service systems.

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