I have always treated auxiliary systems calcs the same as total area. In other words, the total Sq FT of the Wet plus the Dry applies to the Wet system as the total building area protected by one system riser.
So to me, the hydraulics for the dry are treated like just another "Remote Area" in my mind. For what it's worth, I treat the drains the same. In other words, the "Main" drain on the dry system, to me is a gravity drain, not needing to be routed anywhere for full flow. That occurs where the water supply comes into the building in my mind. R/ Matt Matthew J. Willis, C.E.T. Ferguson Fire Design, LLC D: (602) 337-0721<tel:6023370721> C: (307) 236-8249<tel:3072368249> [email protected]<mailto:[email protected]> ________________________________ From: Ben Young <[email protected]> Sent: Tuesday, April 22, 2025 7:11 AM To: 321 via Sprinklerforum <[email protected]> Subject: [Sprinklerforum] BOR point for dry system Caution: This email originated from outside of the organization. DO NOT click links or open attachments unless you recognize and trust the sender. ________________________________ Let's say you have a remote dry system fed off a wet grid. On your calc information box on the drawings and the actual hydraulic placard, do you put the demand at the base of the dry pipe valve riser, or do you put it at the base of the wet riser? Obviously GPM would be the same, but pressure will be different. I've been putting it at the base of the dry pipe valve riser myself, but was curious to see if this was in tune with the rest of the industry. Thanks, Benjamin Young
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