The separate cold water and hot water fixture unit value for fixtures having both cold and hot water connections may each be taken as threequarters 34 of the listed total value of the fixture. Seven minutes for dwelling units one story in height and less than 2,000 square feet 186 m2 in. Additional buildings andor units to be connected to existing. For small residential existing service reuse without fire sprinklers.
Water system facilities charges shall be levied for. Water supply outlets for items not listed above shall be computed at their maximum demand, but in no case less than. Demand of building in water supply fixture units wsfu. The conversion can only be used for one or a few fixtures. First, insert the number of each type of fixture on your premises.
Water supply fixture units may be converted to gallons per minute in accordance with table 382. Second, multiply the quantity by the number of fixture units given under either column private use or public use, whichever is applicable. The water supply shall have the capacity to provide the required design flow rate for sprinklers for a period of time as follows. Water service fixture unit calculation sheet residential. This numerical factor measures the loadproducing effect of a single plumbing fixture of a given kind. Assign fixtureunits from remote outlet toward meter, main upstream from wh branch to carry all cold plus hot, need not exceed size or fus from column c. This is the third edition of awwa manual m22, sizing water service lines and meters. Converting water supply fixture units wsfu to gallons per. So, pipe area should be at least equal to water flow rate divided by eight. 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 fixture units may be converted to gallons per. A fixture unit is equal to one cubic foot of water drained in an 1 14 pipe over one minute citation needed. Flow demand wsfu gpm pipe size inches 1 to 34 1 to 22 1 35 to 99 23 to 43 1. Tabulated fixture units for water supply and drainage design for fixture loads remain a primary dimensionless system for established code applications requirements for pipe sizing in buildings1. Maximum flow maximum flow or maximum possible flow is the flow that will occur if the outlets on all fixtures are opened simultaneously. I recognize that t typical a plumbing system is designed to serve only 1015 percent of the total connected fixture load under simultaneous use. Ashrae modified hunter curve flow charts armstronghot water group, 221 armstrong blvd. A fixture unit is used in plumbing design for both water supply and waste water.
This appendix provides a general procedure for sizing a water supply system. Dc water backwater evaluation form dc water backflow prevention form dc water booster pump form. The load factor for intermittent flow fixtures on water supply piping shall be computed in terms of water supply fixture units as specified in tables 382. Table q allowance in equivalent length of pipe for friction loss in valves and fittings. Chapter 6 water supply and distribution 2015 international. Column 4 is the maximum number of fixture units permitted on a water meter when the plumbing fixtures are predominantly flush valve type water closets and urinals, based on 2012 upc, 2012 ipc or. Table o water supply fixture units wsfus for a supply system with flushometer water closets 890. Because of the variable conditions encountered, it is impractical to lay down definite detailed rules of procedure for determining the sizes of water supply pipes in an appendix, which shall necessarily be limited in length. Supply fixture units worksheet instructions dc water meter sizing worksheet small service dc water meter sizing worksheet large connection dc water meter sizing worksheet small service and large connection other forms. The rubber washer shown in figure 66 is commonly referred to as a doughnut washer because of its thickness. Design of potable water plumbing systems ced engineering. When many fixtures are added up the number must be compensated due to the.
Hot water plumbing systems course content part 1 estimating hot water demand plumbing service design practice may be regarded as an art rather than a science. Fixture outlet individual 3 or more general heavyuse. Supply load in the building water distribution system shall be determined by total load on the pipe being sized, in terms of watersupply fixture units w. The listed minimum supply branch pipe sizes for individual fixtures are the nominal i. This new edition expands the ways to approach the sizing of water service lines and meters and offers improved methods for the sizing of dedicated irrigation meters. Methods of estimating loads in plumbing systems govinfo. First, insert the number of each type of fixture on your premises under the column headed quantity.
Customer services department for simplicity and consistency with oak park requirements. Water supply fixture units worksheet for existing service reuse residential supply fixture units worksheet instructions dc water meter sizing worksheet small service dc water meter sizing worksheet large connection. Water supply fixture units wsfu one wfsu for a singel unit corresponds to one gpm, or. Water supply fixture units wsfu engineering toolbox. Converting water supply fixture units wsfu to gallons per minute flow gpm introduction the water supply fixture unit wsfu values in this appendix are interpolated between the values listed in table 10. Where fixture branches to the building supply are sized for the same permissible friction loss per 100 feet 30480 mm of pipe as the branches and risers to the highest level in the building, and lead to inadequate water supply to the upper floor of a building, one of the following shall be provided. Instructions for completing water calculation worksheet, sbd. A general rule of thumb is to equate 1 gpm with 2 fixture units. Seven minutes for dwelling units one story in height and less than 2,000 square feet 186 m2 in area. Converting water supply fixture units wsfu to gallons. Each fixture has its own singular loading effect on the system, which is determined by the rate of water supply required, the duration of each use, and the frequency of use.
A fixture unit is not a flow rate unit but a design factor. Supply load in the building water distribution system shall be determined by total load on the pipe being sized, in terms of water supply fixture units w. This is based on sanitary sizing, but the philosophy is what comes out of a water supply generally goes out the drain. Supply piping would be calculated accordingly, while the total figure of the two fixture units would be used to design the. Design of potable water plumbing systems cedengineering.
Minimum sizes of fixture water supply pipes 605 materials, joints and connections table. B to the degree that the increments between the wsfu listings are close enough that they do not produce. Credit will be given for the fixture units removed based upon applicable use categories. The use of fixture units can be applied to a single basic probability curve or table, found in the various sizing. Eight steps to determine plumbing system requirements. The fixture unit concept is a method of calculating maximum probable water demand within large buildings based on theory of probability. Fixture a fixture is any device for the distribution and use of water in a building. A conversion table of the water demand load in fixture units to gallons per minute tabulated based on chart a 2. Please place future plumbing related posts in the plumbing engineering forum. Instructions for completing water calculation worksheet. The peak demand must be determined in each part of the hot and cold water supply system which includes the corresponding water supply fixture unit and conversion to gallons per minute lm flow rate to be expected through each. Plumbing code city of chicago as amended march 28, 2001. It is not the initent of this calculation sheet to reduce, increase or otherwise change the illinois plumbing code requirements. The listed fixture unit values represent their load on the cold water building supply.
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 n water supply fixture units wsfus for a supply system with flush tanks water closets 890. The pressure in the water supply pipe near the water outlet while the faucet or outlet is fully open and flowing. The combined capacity of the source and storage in an individual water supply system shall supply the fixtures with water at rates and pressures as required by this chapter. Hot water demand varies with the type of establishment, usage, occupancy, fixture types, time of day and host of other factors. Fixture count, flow calculations, line and meter size north city water district. For water hammer control in commercial plumbing applications, such as water closets, urinals and lavs in public restrooms, use the following sizing and placement guidelines based on fixture unit totals for each individual headersupply line. Instructions for completing water calculation worksheet, sbd 6479 r1111 1. The fixture unit concept is a method of calculating maximum probable water demand.
Fullbath group flush tank 1 tank toilet, 1 bathroom sink and either 1 shower, 1 tub or 1 showertub combination. Load values for fixtures must be determined as water supply fixture units and then converted to a gallonperminute gpm rating to determine peak demand. Water supply and distribution 601 general 602 water required 603 water service 604 design of building water distribution system table. Sizes for fixture supply pipes provided in table 1 and table 2 are minimums. Appendix e sizing of water piping system 2015 international.
Appendix b sizing the building water supply and distribution. Design of plumbing systems for multistorey buildings. Water supply fixture units worksheet msw4 small existing service 2inch and smaller diameter existing water service is classified as a small existing service. Supply fixture units worksheet instructions dc water. Water supply fixture units wsfu for a system with flush tanks. The jiffy connector used here is the same as the connector used to connect the water supply to the faucets of a lavatory. Water supply fixture units wsfu and minimum fixture branch pipe sizes. Individual fixtures, minimum fixture branch pipe size, water supply fixture units wsfu. The first edition was printed in 1975, and the second edition was printed in 2004. The water supply fixture unit wfsu is defined by the american uniform plumbing code upc and is used to calculate the demand in water supply systems.