This same bathtub is assigned only two drainage fixture units. 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 … Size the pipe using demand vs. friction loss curves found in the IPC charts. 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%. 2. 1 DWV System Load. values in accordance with Table P3004. The load on DWV-system piping shall be computed in terms of drainage fixture unit (d.f.u.) Second, multiply the quantity by the number of fixture units given under either column “Private Use” or “Public Use”, whichever is applicable. When vents are increased one pipe size for their entire length, the maximum length limitations specified in this table to not apply. Example: shower, urinal, fountain, shower, sink, water faucet, tap, hose bibs, hydrant etc. 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 Friction coefficients may vary with pipe material. Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Sizes. 1. The listed fixture unit values represent their load on the cold water building supply. - charts are based on clean pipes. 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. 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. Note! Add up the total number of water supply fixture units (wsfu) required in the facility. Following is an explanation of each of these steps and instructions on using the related IPC charts. Estimate demand using the table from the IPC that correlates wsfu to expected demand. First, insert the number of each type of fixture on your premises under the column headed “Quantity”. P3004. Fixture - A fixture is any device for the distribution and use of water in a building. A measure of the probable discharge into the drainage system by various types of plumbing fixtures. For example, a bathtub installed in a private-use occupancy is assigned four water supply fixture units. Maximum flow – Maximum flow or maximum possible flow is the flow that will occur if the outlets on all fixtures are opened simultaneously. Fixture unit load values for drainage and vent piping shall be computed from the above table. 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. )a Laundry tub 2 Shower stall 2 Water closet (1.6 gallons per flush) 3 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 fixture units on the premises must first be determined. 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