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