No, don’t use foam in the ducts or dust collector. Protecting the space with a foam-water system is appropriate, but note, be sure to also look at NFPA 30 for design criteria since you are dealing with flammable liquids. NFPA 16 and NFPA 30 have different duration requirements. Is there any storage of these materials in the space? You need to know if there are any drums or totes present.
When you speak of a dust collector, we’re assuming you are dealing with totally different hazards such as a combustible dust. Is the dust collector being provided with any other safety devices? Who has established that suppression is required? If the system is conveying flammable vapors and particulate you need to have someone qualified do a hazards analysis to determine what is the appropriate protection media for what is being conveyed. Water may not be effective or appropriate. Foam-water is not an effective media for protection of these types of systems. Also, if you use any foam system criteria understand that the design density isn’t automatically 0.16 gpm/sf. That is the minimum. You need to consult with a foam mfgr. and provide the chemicals you’re dealing with and let them recommend a design density and sprinkler discharge device. Since both products are polar solvents, you might very well be at 0.16 but verify and get confirmation with your foam vendor. Craig Prahl | JACOBS | Fire Protection | Greenville SC | 864.676.5252 | craig.pr...@ch2m.com<mailto:craig.pr...@ch2m.com> | www.jacobs.com<http://www.jacobs.com/> From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Ben Young Sent: Friday, April 13, 2018 1:46 PM To: firstname.lastname@example.org Subject: [EXTERNAL] Foam in spray rooms I'm working on project that has a coating room that uses MEK and acetone. We were already protecting the exterior tanks with a foam deluge system, and now we've been asked to do a wet foam system in the coating room, the exhaust duct, and the dust collector. So this all falls under NFPA 33, I get that. And this does say you can use NFPA 16 for protection, but has anyone ever actually used foam in exhaust ducts and a dust collector before? I kicked it back to the owner's consulting engineer asking for a full basis of design but in the meantime I was curious to see if this was a common request or not. Thanks, Benjamin Young ________________________________________________________________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
_______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org