All understood and for the record, I’m pretty sure that I already know the answer to the question I posed. The inspector wants to confirm that the minimum flow rate is based on velocity only and does not have to meet or exceed system demand.
SL From: Brett Peters <[email protected]> Sent: Tuesday, January 28, 2025 2:32 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Cc: Brent Kearney <[email protected]> Subject: [Sprinklerforum] Re: UG flush - minimum flow rate 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]<mailto:[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<http://www.proudline.ca/> Proudline now offers ULc listed monitoring services, please contact [email protected]<mailto:[email protected]> for more information [https://ci3.googleusercontent.com/mail-sig/AIorK4wRo6r0eNDUWx8YR-4XJLvwcnouQn_xEZH_HIb4jDbepWtON2RWC-ekzvZHKtncFOQqPcNQfzM] [https://ci3.googleusercontent.com/mail-sig/AIorK4yJVI287VPLDWiW9maE2Np3U4CdszCY9deeyaLl8DM90wlBd7pnuOZV9U-swv-7gWN_24py6vo] [https://ci3.googleusercontent.com/mail-sig/AIorK4wlGmqj6Ja06DKOIMLPvEE8B2W8fT_TPPA3w-4JfqygLq9n77ECSni09YLIVICXJYzWo4Z0PjU] [https://ci3.googleusercontent.com/mail-sig/AIorK4zEgPbs279KVEfWIpIiWNLel8zAlcloW9dNXGLTaE1cMz88CRkmg17fju5BQB_iIzhWK20DUL8] [https://ci3.googleusercontent.com/mail-sig/AIorK4z7J0kfmSGA8jKvDK0pTqW3KQlc5v-tYcWosmy5W7pdok462Gzu_9Ft7UK9oJUWDT1DzhQ4hUU] [https://ci3.googleusercontent.com/mail-sig/AIorK4wTVHoTZxkppBoWSCTFnGLgGTq0apivi8sNvWPyBsloO0mmy8ZYu4Ax854jo7ihTMFyeYeOceg] [https://ci3.googleusercontent.com/mail-sig/AIorK4xwBWEOX5v9mpza4Jqf9lOKSwThBNvyIO7Rl-Cxo7NRiV7p70C0f1biwbh44Y-iIA5GcmD1MCo] [https://ci3.googleusercontent.com/mail-sig/AIorK4yPfO1HdtbQPYiKlYE38cwc88ABhX7xN1nh0fCK5LjFXjKplJggk3Xn6_XypmtMWyADKR7ZRGk] On Tue, Jan 28, 2025 at 3:11 PM Steve Leyton <[email protected]<mailto:[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? [cid:[email protected]] 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]<mailto:[email protected]>
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