With your break tank capacity exceeding a 30 minute duration, that is the way I would interpret it. Depending on your available water supply, you may have to increase your break tank size in order for your required refill rate to be less than your available refill rate.
Sincerely; Jackie "JW" Ward; SET 1-405-240-7076 [email protected]<mailto:[email protected]> NICET IV Cert. No. 104187 Victaulic Vortex Integrator Firetrol Protection Systems 108 NW 132nd Street; Oklahoma City, OK 73114 405-752-2330 Ext. 10230 Fax:405-752-2297 License No: AR-FSS-162, LA-F415, OK-863 & 302, TX - ECR-1751432, ACR-1751168, SCR-G-0292 [cid:[email protected]][Firetrol Oklahoma City BACK] [cid:[email protected]] From: Daniel Bobadilla <[email protected]> Sent: Wednesday, January 24, 2024 9:47 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Refill mechanism for a break tank (NFPA 22) Hello guys, hoping you're doing great! I am designing a sprinkler system for a warehouse, but the pressure from the city water main is to weak to deliver the required pressure to the system, so the client wants to install a booster pump with a break tank. The break tank is sized to provide a duration of 30 minutes of the maximum system demand (1282 gpm), this is 38,500 gallons aprox. The issue is how to calculate the refill mechanism. NFPA 22-2018 sec. 14.5.2.2.1 states "The refill mechanism shall be designed for and capable of refilling the tank at 110 percent of the rate required to provide the total fire protection system demand [110% (Total Demand – Tank Capacity) / Duration]." In terms of system demand (1282 gpm for 120 minutes according to a CMDA sprinkler system = 153,840 gallons) I made the following calculation: 110% (153,840 gal - 38,500 gal) /120 min = 1,057 gpm. The refill mechanism shall be capable of providing a flow of 1,057 gpm to fill the tank while the fire pump is operating at system demand. Am I right? Bless to all of you! -- =?Este mensaje se dirige exclusivamente a su destinatario y puede contener información privilegiada o confidencial. Si no es Ud. el destinatario indicado, queda notificado de que la utilización, divulgación y/o copia sin autorización está prohibida en virtud de la legislación vigente. Si ha recibido este mensaje por error, le rogamos que nos lo comunique inmediatamente por esta misma vía y proceda a su destrucción. This message is intended exclusively for its addressee and may contain information that is confidential and protected by professional privilege. If you are not the intended recipient you are hereby notified that any dissemination, copy or disclosure of this communication is strictly prohibited by law. If this message has been received in error, please notify us immediately via e-mail and delete it.
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