We don’t do a ton of these, but we’ve always done OH II to my knowledge. NFPA 33 really applies to the spray application area only, which typically we do OH II above and inside the spray application area (or under the parts of it that obstruct the ceiling as they’re typically not fully sealed enclosures as they’re usually similar to what you describe a continuous line) and the parts with powder are negligible from a fire hazard perspective. Arguably the powder is a combustible but everything else involved is metal in the curing process as far as I’m aware. Outside of the spray room my only “double check” would be that the general type of manufacturing going on wouldn’t require a higher density since really it’s just a room with equipment that is part of that type of manufacturing occupancy at that point.
Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email [email protected] [cid:[email protected]] From: Fpdcdesign <[email protected]> Sent: Tuesday, July 11, 2023 10:30 AM To: Sprinklerforum <[email protected]> Subject: [Sprinklerforum] Powder coating oven This is my first time doing a powder coating operation. This is a continuous batch system where the product is suspended from a chain system that transports it through the process. As part of the process, it is run through a 400 degree F (max) ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message originated outside your organization. ZjQcmQRYFpfptBannerEnd This is my first time doing a powder coating operation. This is a continuous batch system where the product is suspended from a chain system that transports it through the process. As part of the process, it is run through a 400 degree F (max) curing oven, which is about 20’ x 30’. The construction is all steel, the products being sprayed are steel and the only potential combustibles would be anything from the uncured powder. The consultants for the company that is installing the furnace had evaluated it based on NFPA 86 and determined that sprinkler in the oven are not required. Per NFPA 33, this occupancy can be protected as OH2. However, my question is does the presence of the unsprinklered oven present a shielding hazard that would bring the requirement up to EH2, or does the lack of combustibles make this unnecessary? 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) This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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