Ductwork is like protecting specialty equipment, there isn't necessarily a box you can put it in when it comes to NFPA 13 occupancies. You have to be able to analyze the process and determine the hazard before you can assign a protection scheme for things such as this.
One additional tool in the designer's toolbox is the FM Global data sheets. NFPA 13 doesn't always address every single possible protection scheme where a water based sprinkler would be beneficial. If you have questions about a particular application you can refer to other recognized industry Standards for additional information and insight. The owner doesn't have to be FM insured to be able to use this data to defend or establish a design criteria for unique applications that NFPA may not address. I have yet to run across an AHJ that rejected the use of FM Global criteria when NFPA didn't address the situation. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, August 10, 2016 1:03 PM To: [email protected] Subject: RE: Paint spray application [EXTERNAL] Well, it's all I got. I think there is a little wiggle room regarding occupancy classification. For example, in the duct we can be max 12'-0" whilst outside the duct it is 10' max. That's a little weak, but, seeing as how I am a NICET certified engineering technician I see no wiggle room in using a sprinkler outside it's listing. I believe like you that deflector orientation in a duct is a non-issue due to deflectors determine the pattern at the floor, butt.... see "Ken's well known aversion to courtrooms" for details :) Brad ps, thank you, and you too Bob, for helping me out of the doldrums yesterday ________________________________ From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected]<mailto:[email protected]> Sent: Wednesday, August 10, 2016 7:44 AM To: [email protected]<mailto:[email protected]> Subject: RE: Paint spray application How do you know the quantity of combustibles? Typically the issues with ductwork is based on a hazardous environment (transporting flammable or combustible vapors or combustible particulate) that's the whole reason behind the requirement of protection of the ductwork. The other condition is that there is accumulation of the same material on the interior of the duct over time creating a hazardous environment. So in either case there is no way to call it an ordinary hazard environment. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, August 10, 2016 8:40 AM To: [email protected]<mailto:[email protected]> Subject: RE: Paint spray application [EXTERNAL] To be completely formal, is it possible to consider the duct to be an OH portion of the EH Classification? Not much quantity of combustible there.
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