Estimate demand using the table from the IPC that correlates wsfu to expected demand. The Uniform Plumbing Code defines Drainage Fixture Unit as follows: Drainage (dfu). Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Sizes. Important notes: Appliances, appurtenances, and fixtures not referenced in the table below shall be permitted to be sized by reference to fixtures having a similar flow rate and frequency of use. A drainage fixture unit is based on the relative discharge of one type of fixture as compared to the discharge of another type of fixture. Example: shower, urinal, fountain, shower, sink, water faucet, tap, hose bibs, hydrant etc. Table 703.2 shows the maximum number of fixture units allowed on a vertical or horizontal drainage pipe, building drain, or building sewer of a given size; the maximum number of fixture units allowed on a branch interval of a given size; and the maximum length (in feet and meters) of a vertical drainage … P3004. fixture units on the premises must first be determined. This same bathtub is assigned only two drainage fixture units. TYPE OF FIXTURE OR GROUP OF FIXTURES DRAINAGE FIXTURE UNIT VALUE (d.f.u. TABLE 709.1 Drainage Fixture Units for Bathroom Groups 712.3.3 Sump Pump and Ejector Discharge Pipe and Fittings 712.3.5 Sump Pump Connection to the Drainage System 715.1 Fixture Protection from Sewage Backfl ow SGNS C SO 42474_pt01_ptg01_hr_001-071.indd 2 6/29/11 12:54 PM Size the pipe using demand vs. friction loss curves found in the IPC charts. Not to exceed one third (1/3) of the total permitted length of any vent may be installed in a horizontal position. 2. The listed fixture unit values represent their load on the cold water building supply. For example, a bathtub installed in a private-use occupancy is assigned four water supply fixture units. Friction coefficients may vary with pipe material. First, insert the number of each type of fixture on your premises under the column headed “Quantity”. When vents are increased one pipe size for their entire length, the maximum length limitations specified in this table to not apply. 1. Note! If a property had more than 165 fixture units, for example a multi-storey development, you must increase the pipe size to DN 125 to lay the drain at the same grade of 1.65%. Fixture - A fixture is any device for the distribution and use of water in a building. Second, multiply the quantity by the number of fixture units given under either column “Private Use” or “Public Use”, whichever is applicable. values in accordance with Table P3004. A measure of the probable discharge into the drainage system by various types of plumbing fixtures. Following is an explanation of each of these steps and instructions on using the related IPC charts. 1 DWV System Load. )a Laundry tub 2 Shower stall 2 Water closet (1.6 gallons per flush) 3 Add up the total number of water supply fixture units (wsfu) required in the facility. 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; Drains and Sewers - Drainage Fixture Units (DFU) connected to building drains and sewers The load on DWV-system piping shall be computed in terms of drainage fixture unit (d.f.u.) 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