I think the question revolves around setting of PRVs. If you have a reduction of 4 psi static from a backflow device, that is ±9' and may be enough to save you a PRV. I have always erred on the side of caution and not taken the reduction in static at zero flow. But I am eager to hear from the industry how this is out in the field.
Travis Mack, SET MEPCAD | Instructor / Training 181 N. Arroyo Grande Blvd. #105 I Henderson, NV 89074 www.mepcad.com<http://www.mepcad.com/> | 303-923-8215 Email: [email protected] AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD Academy of Fire Sprinkler Technology | Executive Director 101 S Main Street, Suite 001, Decatur, IL 62523 ________________________________ From: Henry Leon <[email protected]> Sent: Thursday, August 13, 2026 8:57 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: static pressure loss through backflow You don't often get email from [email protected]. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> Hi Matt, Yes they typically impact the static pressure which means there is an impact at very low flows which becomes important in 13R applications. Henry Leon From: Matt Grise <[email protected]> Sent: Thursday, August 13, 2026 9:06 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] static pressure loss through backflow do backflow preventers typically reduce static pressure? The charts provided with BFP's do show a loss at 0gpm, but is loss the same when flow is increasing and decreasing? I usually apply the pressure loss from a BFP at a flowing condition, so I'm not sure how they affect static condition. Anyone know? Thanks! Matt Grise
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