Table E103.3(3) of the IBC 2018 Appendix E is the Table used for sizing domestic pipe and determining flows.
To use this table you start with determining the total fixture units per dwelling unit then determine water supply fixture units(wsfu) from Table 103.3(3) (to size domestic supply for dwelling unit ), total all wsfu for floor, then determine wsfu for building,, then at each building domestic connection you then determine the flow for the cumulative wsfu for each lateral domestic connection for each building, then for the entire campus you determine the total wfsu for the campus go to Table E103.3(3) and look up the total campus wsfu domestic flow. The following is an example: Building 1 – Total wsfu 340.8 - Bldg Dom GPM 95 from Table E103.3(3) Building 2 – Total wsfu 312.8 - Bldg Dom GPM 90 Building 3 – Total wsfu 410.4 - Bldg Dom GPM 110 Building 4 – Total wsfu 410.4 - Bldg Dom GPM 110 Building 5 – Total wsfu 459.6 - Bldg Dom GPM 115 The total campus Domestic Waterflow is based on the total wsfu of campus of 1934 wsfu which equals 315 GPM Table E103.3(3) when developed takes into account that not all of the fixtures are in use at any one time and reduces the domestic flow requirements as the fixture count increases. I would use the campus domestic demand for the total campus domestic flow and the building domestic flow for sizing water supply lateral into the building based on each building’s specific domestic flow. Table E 103.3(3) is one of the “ICC” approved methods of calculating water flow and should be provided by the site engineer of record. Hope this helps. Have a fire safe and healthy day. Regards, Jim Davidson -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of J H via Sprinklerforum Sent: Thursday, November 12, 2020 3:06 PM To: [email protected] Cc: J H <[email protected]> Subject: Re: Domestic Demands 13R If the AHJ digs in there is always the route of using automatic domestic shutoff valves.. <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free. www.avast.com<http://www.avast.com> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Thu, Nov 12, 2020 at 9:34 AM Travis Mack via Sprinklerforum < [email protected]<mailto:[email protected]>> wrote: > Forumites: > > Per 13R 9.6 it requires the domestic demand for the building being > calculated to be added to the fire sprinkler system. This is > generally not an issue. If you have a complex of say 20 buildings on > site that is supplied by a common water line serving both domestic and > fire, are you required to include the domestic demand for each > building on the site water main. > > For example, if I have a project with a 8" main going through the > complex, and 4" lead-ins to each building, with a domestic demand of > 125 gpm for each building, how are you doing the domestic demand? > With the domestic / fire split in the building, it is required to > include the 125 gpm demand in addition to the fire sprinkler system > demand in the 4" line. Are you including the other 2375 gpm (19 > additional buildings at 125 gpm domestic allowance), in your calculations > back to the city main? > > This seems quite excessive. If it were a 13 system, you would have > similar flows and a 100 gpm hose allowance. There is no requirement > in this example to include the domestic in a 13 system. But, if you > are required to include the additional 2375 gpm, that could be quite > taxing on the site supply. Again, how is everyone handling it. > > We have seen AHJ's take both approaches on this. > > > Travis Mack, CFPS, CWBSP, RME-G, SET > Engineering Manager > MFP Design > 3356 E Vallejo Ct > Gilbert, AZ 85298 > NEW EXTENSION: 480-505-9271 ext. 700 > NEW MOBILE: 480-272-2471 > [email protected]<mailto:[email protected]> > www.mfpdesign.com<http://www.mfpdesign.com> > > Send large files to us via: https://www.hightail.com/u/MFPDesign > LinkedIn: https://www.linkedin.com/in/travismack > > “The bitterness of poor quality remains long after the sweetness of > low price is forgotten.” > > Need/Want a faster way to check material pricing? Build a material > quote? Check availability ? Searching for an invoice? > *If you do not already have an account with ferguson.com, click here > to > register.* > **Have a Ferguson account? Download the Ferguson app for on-the-go > access to your favorite ferguson.com features. Apple iOS devices or > Android > devices** > > _______________________________________________ > Sprinklerforum mailing list > [email protected]<mailto:[email protected]> > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
