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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