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Drains and Sewers

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 a sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment

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

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