I believe it is NFPA 33 that covers these spaces. The criteria is to calc all sprinklers in the booth if you don't have enough for the hazard. I'm paraphrasing of course. So you don't need to add the phantom flow for the booth.
Travis Mack, SET M.E.P.CAD | Instructor / Support 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 | Director, Engineering Technology 101 S Main Street, Suite 001, Decatur, IL 62523 ________________________________ From: Fpdcdesign <[email protected]> Sent: Wednesday, April 9, 2025 6:46 AM To: Sprinklerforum <[email protected]> Subject: [Sprinklerforum] Phantom flow on partial system. I am working on a 4500 sqft commercial building that is presently unsprinklered. There is no plan or requirement to install a full system at this point. The building is to be occupied as an auto body shop. There is an existing 14x24 spray booth that has a system fed from the 2” domestic. There is a system in the spray booth that is neither complete nor hydraulically correct. I am in the process of re-designing it. The spray booth requires 4 sprinklers and the exhaust stack, one. The design criteria is Extra Hazard 2. The sprinkler flow for the 5 sprinklers is 178 gpm. If I look at the “Phantom Flow” requirements, that would result in an additional 822 gpm to be added at the point where the furthest branch line meets the cross main to make the 1000 gpm. First of all, is this really required? Secondly, this seems ridiculous to do this in an otherwise unsprinklered building. What purpose does it serve? 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)
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