Fixture Units are used in plumbing design for both water supply (WFSU) and waste water (DFU).
Since the fixtures in a system are never used all at the same time, the total units (capacity) achieved by adding the numbers for all fixtures must be compensated for intermittent use if we want a realistic estimate of the total drainage load.
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.
Required cold water dwelling storage capacity - commonly used fixtures and types of buildings.
Cold water storage for occupants in common types of buildings as factories, hospitals, houses and more
Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .
Drainage Fixture Units (DFU) connected to building drains and sewers.
Recommended drain trap sizes for different types of fixtures
Plumbing or sanitation codes are a set of rules and regulations imposed by cities, counties or states.
Calculate expected volume flow load in sanitary drainage systems.
Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.
Carrying capacities of sewer and wastewater pipes - gpm and liter per second.
No. of fixture units and required trap size.
WSFU is used to calculate water supply service systems.
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