Fullbath group flush tank 1 tank toilet, 1 bathroom sink and either 1 shower, 1 tub or 1 showertub combination. 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. Second, multiply the quantity by the number of fixture units given under either column private use or public use, whichever is applicable. I recognize that t typical a plumbing system is designed to serve only 1015 percent of the total connected fixture load under simultaneous use. The first edition was printed in 1975, and the second edition was printed in 2004. Fixture outlet individual 3 or more general heavyuse. The jiffy connector used here is the same as the connector used to connect the water supply to the faucets of a lavatory.
Supply piping would be calculated accordingly, while the total figure of the two fixture units would be used to design the. Fixture a fixture is any device for the distribution and use of water in a building. Water supply outlets for items not listed above shall be computed at their maximum demand, but in no case less than. Instructions for completing water calculation worksheet. The fixture unit concept is a method of calculating maximum probable water demand. Converting water supply fixture units wsfu to gallons.
Credit will be given for the fixture units removed based upon applicable use categories. Design of potable water plumbing systems cedengineering. A fixture unit is equal to one cubic foot of water drained in an 1 14 pipe over one minute citation needed. 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.
Appendix b sizing the building water supply and distribution. Customer services department for simplicity and consistency with oak park requirements. 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. This is the third edition of awwa manual m22, sizing water service lines and meters. Individual fixtures, minimum fixture branch pipe size, water supply fixture units wsfu. 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.
The pressure in the water supply pipe near the water outlet while the faucet or outlet is fully open and flowing. Demand of building in water supply fixture units wsfu. Seven minutes for dwelling units one story in height and less than 2,000 square feet 186 m2 in. First, insert the number of each type of fixture on your premises. Please place future plumbing related posts in the plumbing engineering forum. 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. For small residential existing service reuse without fire sprinklers. This numerical factor measures the loadproducing effect of a single plumbing fixture of a given kind. Fixture units, trap and connection sizes for plumbing fixtures for domestic waters. Plumbing code city of chicago as amended march 28, 2001.
Water supply fixture units wsfu engineering toolbox. Eight steps to determine plumbing system requirements. The rubber washer shown in figure 66 is commonly referred to as a doughnut washer because of its thickness. Ashrae modified hunter curve flow charts armstronghot water group, 221 armstrong blvd. Seven minutes for dwelling units one story in height and less than 2,000 square feet 186 m2 in area. 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. Minimum sizes of fixture water supply pipes 605 materials, joints and connections table. Maximum flow maximum flow or maximum possible flow is the flow that will occur if the outlets on all fixtures are opened simultaneously. Supply fixture units worksheet instructions dc water. Water supply fixture units worksheet msw4 small existing service 2inch and smaller diameter existing water service is classified as a small existing service. Water supply fixture units may be converted to gallons per. 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 use of fixture units can be applied to a single basic probability curve or table, found in the various sizing. Water supply fixture units wsfu one wfsu for a singel unit corresponds to one gpm, or.
Water supply fixture units wsfu for a system with flush tanks. Additional buildings andor units to be connected to existing. Dc water backwater evaluation form dc water backflow prevention form dc water booster pump form. Table o water supply fixture units wsfus for a supply system with flushometer water closets 890. 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. Methods of estimating loads in plumbing systems govinfo. 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.
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. The water supply shall have the capacity to provide the required design flow rate for sprinklers for a period of time as follows. 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. The fixture unit concept is a method of calculating maximum probable water demand within large buildings based on theory of probability. So, pipe area should be at least equal to water flow rate divided by eight. Load values for fixtures must be determined as water supply fixture units and then converted to a gallonperminute gpm rating to determine peak demand. 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 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.
A general rule of thumb is to equate 1 gpm with 2 fixture units. Flow demand wsfu gpm pipe size inches 1 to 34 1 to 22 1 35 to 99 23 to 43 1. 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 system facilities charges shall be levied for. It is not the initent of this calculation sheet to reduce, increase or otherwise change the illinois plumbing code requirements. Table n water supply fixture units wsfus for a supply system with flush tanks water closets 890. Hot water demand varies with the type of establishment, usage, occupancy, fixture types, time of day and host of other factors. Water supply fixture units may be converted to gallons per minute in accordance with table 382. Water supply fixture units wsfu and minimum fixture branch pipe sizes. Sizes for fixture supply pipes provided in table 1 and table 2 are minimums. This appendix provides a general procedure for sizing a water supply system. 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. 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. Table q allowance in equivalent length of pipe for friction loss in valves and fittings.
This is based on sanitary sizing, but the philosophy is what comes out of a water supply generally goes out the drain. A fixture unit is not a flow rate unit but a design factor. Design of potable water plumbing systems ced engineering. First, insert the number of each type of fixture on your premises under the column headed quantity. Instructions for completing water calculation worksheet, sbd 6479 r1111 1. Chapter 6 water supply and distribution 2015 international. Water service fixture unit calculation sheet residential. Design of plumbing systems for multistorey buildings. When many fixtures are added up the number must be compensated due to the. A conversion table of the water demand load in fixture units to gallons per minute tabulated based on chart a 2. 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. 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. A fixture unit is used in plumbing design for both water supply and waste water.
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