Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! WSFU is used to calculate water supply service systems.
The WSFU (Water Supply Fixture Units) is defined by the
Uniform Plumbing Code (UPC) and can be used to determine water supply to fixtures and their service systems.
Water Supply vs. Fixture Units Individual Fixtures Minimum Fixture Branch Pipe Size Water Supply Fixture Units WSFU (inch) Private Installations Public Installations Bathtub 1/2 4 4 Bathtub with 3/4" fill valve 3/4 10 10 Bidet 1/2 1 Combination sink and tray 1/2 Dishwasher, domestic 1/2 1.5 1.5 Drinking fountain 1/2 0.5 0.5 Hose bibbs 1/2 2.5 2.5 Laundry, 1 - 3 compartments 1/2 Lavatory 1/2 1 1 Bar sink 1/2 1 2 Clinic fauce sink 1/2 3 Kitchen sink, domestic 1/2 1.5 1.5 Laundry sink 1/2 1.5 1.5 Service or mop basin 1/2 1.5 3 Sinks, flushing rim 3/4 Sinks, service 1/2 Washup basin 1/2 2 Shower, single head 1/2 2 2 Urinal, flush tank 1/2 2 2 Urinal, flushometer valve 3/4 Wall hydrant 1/2 Wash fountain 3/4 4 Water closet, gravity flush tank 1/2 2.5 2.5 Water closet, flushometer valve 1 2.5 2.5 Water cooler 1/2 0.5 0.5 1 WSFU = 1 GPM = 3.79 liter/min 1 in = 25.4 mm
Note that this conversion is only true for one or a few fixtures. Since all fixtures in a system are never used at the same time, the total units achieved by adding the numbers for all fixtures must be compensated for their intermittent use.
For supply pipe lines this is taken care of in the sizing tables.
For manifolds or special equipments sizing, a
formula or a table can be used. Related Topics Hot and cold water service systems - design properties, capacities, sizing and more. Related Documents DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems. 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 Design procedures for domestic hot water service systems. 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. Farming and animals required water supply. Content of hot water in some common used fixtures - basins, sinks and baths. Pressure loss in hoses due to water flow and friction. Recommended dimensions hot and cold water pipes. Hot water can be circulated through a return pipe if it's instantly required at the fixtures. Consumption of hot water per person or occupant. Nominal pipe size, outside diameter, wall thickness, weight and working pressure. Plumbing or sanitation codes are a set of rules and regulations imposed by cities, counties or states. Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems. Materials used in water distribution pipes. Calculating expected demand for water supply service lines. It is fundamental to keep the potable water in the water supply systems uncontaminated. Converting WSFU - Water Supply Fixture Units - to GPM. Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU). Sizing of water supply pipe lines. Required water supply to public buildings. Free online tool for designing water supply systems in buildings. Water consumption in garden fixtures.
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