JD, I interpreted “room” as being the room where the spraying is done. 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)
> > On Apr 9, 2025 at 8:05 AM, <JD Gamble (mailto:[email protected])> > wrote: > > > > > > Doesn’t code require any “room” in which spray operations are conducted to be > fully sprinkled? > > > > > > > > NFPA 33: 2018 ed. - 4.1.1* Locations in Other Occupancies. Spray > application operations and processes shall not be conducted in any building > that is classified as an assembly, an educational, a day care, a health care, > an ambulatory health care, a detention/correctional, a residential, a > mercantile, a business, or a storage occupancy, unless the following > requirements are met: > > > > (1) The spraying is located in a room that is separated both > > > > vertically and horizontally from all surrounding areas by > > > > construction having a fire resistance rating of not less > > > > than 2 hours or in a spray room (see Section 5.2). > > > > (2) The room is protected by an approved automatic sprinkler > > > > system designed and installed in accordance with > > > > NFPA 13. > > > > > > > > > > From: Fpdcdesign <[email protected]> > Sent: Wednesday, April 9, 2025 5:46 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) > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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