Please keep in mind if an underground supply a fire pump system, the minimum velocity is 15 fps. While I do not agree with this requirement, iut is in the book.
Thanks, John John August Denhardt, PE *Vice President, Engineering and Technical Services* *American Fire Sprinkler Association* m: p: 301-343-1457 214-349-5965 ext 121 w: firesprinkler.org Kickstart 2025 with Top-TIer Training! AFSA is offering a variety of training to start 2025 off right! Learn design, hydraulic calculations, and ITM with our best-in-class training. Learn more and register now for the February Beginning Design School <https://www.firesprinkler.org/design>, Sprinkler Hydraulics Course <https://www.firesprinkler.org/programs/calculations/>, Fire Pump ITM <https://www.firesprinkler.org/calendarevent/fire-pump-itm-workshop-9/>, and Beginning ITM workshop <https://www.firesprinkler.org/calendarevent/beginning-itm-workshop-6/>! On Tue, Jan 28, 2025 at 5:36 PM Brett Peters <[email protected]> wrote: > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected] > If this is for a new water main, the intent of this flush is to get rid of > any debris and sediment that would be harmful to the sprinkler system, so > if you have a 6" water service you need to achieve minimum flow for 6" pipe > to adequately flush sediment and debris from the underground piping > > 10.10.2.1.3 The minimum rate of flow shall be not less than > one of the following: > (1) Hydraulically calculated water demand flow rate of the > system, including any hose requirements > (2) Flow necessary to provide a velocity of 10 ft/sec > (3.1 m/sec) in accordance with Table 10.10.2.1.3 > (3) Maximum flow rate available to the system under fire > conditions > > 880gpm for 6" pipe, to produce 10 ft/sec > > If flowing a fire pump you would need to open 2 x 2 1/2" hose valves for > that amount of flow so I'm very sceptical that a single 1 1/2" hose will > produce the amount of flow required for a proper flush, personally when I > have done a flush for a 6" water service we have flushed with 4" > > > > > Thanks > > > > Brett Peters > General Manager Installation & Design > Proudline Fire Protection Services Ltd. > [email protected] > 780 490 7602 office ext 202 > 780 490 7605 fax > 780 777 0568 cell > 780 718 2676 24h > Visit us at www.proudline.ca > > Proudline now offers ULc listed monitoring services, please contact > [email protected] for more information > > > > > > > On Tue, Jan 28, 2025 at 3:11 PM Steve Leyton <[email protected]> > wrote: > >> Sprinkies: >> >> Section 6.10.2.1 (2022 edition) of NFPA 13 prescribes a minimum flow rate >> of 10 fps for flushing, and Table 6.10.2.1.3 offers flow minimum rates for >> different pipe diameters that will achieve that velocity. My question is >> (the one that’s been posed to me by an inspector) is whether or not there’s >> an absolute minimum flow rate in GPM based on size. A contractor has >> proposed to flush a 4” UG through a 1½” connection with “several hundred >> feet” of 1½” hose to a collection point. The inspector is questioning >> (and I’m wondering also) if it is required or is the intent to flush to at >> least the demand of the system, or some other benchmark flow? For >> whatever it’s worth Table 6.10.2.1.3 (10.10.2.1.3 in NFPA 24) starts at 2”, >> so I’m also curious if that implies that 2” is the minimum allowable size >> for a flushing connection? >> >> >> >> *Steve Leyton, President* >> T *|* 619.255.8964 x 102 *| * >> *www.protectiondesign.com <http://www.protectiondesign.com/> *2851 >> Camino Del Rio South *|* Suite 210 *|* San Diego, CA 92108 >> Fire Protection System Design *|* Consulting *|* Planning *|* Training >> >> >> >> _________________________________________________________ >> SprinklerForum mailing list: >> >> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >> To unsubscribe send an email to >> [email protected] >> >
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