If you’re not fluent in Spanish or a translation app uses, César’s message says, “According to the (NFPA 20) handbook, the 10x diameter provision doesn’t apply to vertical in-line electric pumps.”
Steve From: César Gonzales <cgonza...@cosapi.com.pe> Sent: Monday, October 09, 2023 7:15 AM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: Distance to fire pump suction Estimados, De acuerdo con HandBook, las 10 veces el diámetro no aplica si se trata de electrobombas vertical en línea. Saludos. CAGS. De: John Denhardt <jdenha...@firesprinkler.org<mailto:jdenha...@firesprinkler.org>> Enviado el: sábado, 7 de octubre de 2023 10:27 Para: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>> Asunto: [Sprinklerforum] Re: Distance to fire pump suction NFPA 20 - 2023 edition is below. Hmm. I see the issue. This will be added to AFSA NFPA 20 - 2028 list to clarify or address. 4.29.3 Devices in Suction Piping. Where located in the suction pipe of the pump, check valves and backflow prevention devices or assemblies shall be located a minimum of 10 pipe diameters from the pump suction flange. John August Denhardt, P.E. Vice-President Engineering and Technical Services American Fire Sprinkler Association 301-343-1457 On Oct 7, 2023, at 11:19, John Denhardt <jdenha...@firesprinkler.org<mailto:jdenha...@firesprinkler.org>> wrote: I have always used the suction flange size of the fire pump. The suction pipe size and backflow preventer size can vary. I will look at NFPA 20 when I have a chance and see if I can find a reference for you. Thanks, John [https://www.dropbox.com/s/g4h8r7hdtsr6154/AFSA_L.png?raw=1] 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<http://firesprinkler.org/> Sprinkler Hydraulic Calculations Workshop AFSA’s three-day, in-person workshop provides a deep dive into the principles of hydraulics, including the different types of pressure, calculating changes in pressure (elevation and friction loss), and node analysis. Click here<https://www.firesprinkler.org/programs/calculations/> for details and to register. On Sat, Oct 7, 2023 at 10:52 AM Fpdcdesign <fpdcdes...@gmail.com<mailto:fpdcdes...@gmail.com>> wrote: Fire pump is a 250 gpm at 60 psi Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) On Oct 7, 2023 at 10:48 AM, <Tstone52<mailto:tston...@comcast.net>> wrote: Todd, According to NFPA 20, 2013 ed., 4.26, Table 4.26 shows 4” minimum suction. 2022 ED. Is the same. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 tston...@comcast.net<mailto:tston...@comcast.net> From: Fpdcdesign <fpdcdes...@gmail.com<mailto:fpdcdes...@gmail.com>> Sent: Saturday, October 7, 2023 10:16 AM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>> Subject: [Sprinklerforum] Distance to fire pump suction I have a system with a 6” backflow preventer, which reduces to 4” immediately after. There is approximately 48” of 4” pipe to the suction flange on a 4 x 3 pump. All elbows are turning correctly. Is this sufficient? Does the 10x rule apply to the size of the backflow preventer or the fitting directly attaching to the pump? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> __________________________________________________________________________________ Aviso de Confidencialidad: Toda la informacion contenida en este mensaje es confidencial y de uso exclusivo de COSAPI S.A. su divulgacion, copia, adulteracion o cualquier otro tipo de accion estan prohibidas y solo debe ser conocida por la persona a quien se dirige este mensaje. 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