I’d say NFPA 33 takes precedence which explicitly and repeatedly limits the scope of water flow to the booth only and frankly it doesn’t make much sense to me to add phantom flow for a paint booth anyway.
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 mmo...@shambaugh.com [cid:image001.png@01D963DF.66235A30] From: Anthony Johnson <mountainfirepr...@gmail.com> Sent: Friday, March 31, 2023 2:30 PM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Paint Booths Calculation Hello everybody, For a cabinet shop paint booth the overhead system was designed to an Ord Group II occupancy and the owner is now installing a spray booth. The last booth I sprinklered was over a decade ago and things have changed since then. ZjQcmQRYFpfptBannerStart This Message Is From an Untrusted Sender You have not previously corresponded with this sender. ZjQcmQRYFpfptBannerEnd Hello everybody, For a cabinet shop paint booth the overhead system was designed to an Ord Group II occupancy and the owner is now installing a spray booth. The last booth I sprinklered was over a decade ago and things have changed since then. In the past I would just calculate all the sprinklers in the booth. Now we have criteria for mixed occupancies which require a phantom flow at the most remote branchline if your system flow is less than density x sq. ft. (NFPA 27.2.4.2.4 - 2019 ed). In the 2013 edition handbook there was an AHJ FAQ that brought up the exact scenario I'm in and said that you would comply with 27.2.4.2.4 HOWEVER I noticed that the AHJ FAQ does not exist in the 2019 edition and at the end of the day it's just an AHJ FAQ and is not even appendix material so I know it carries no weight but I want to make sure I nail this right. On one hand I'm thinking this is not an area/density calc so I should just stick to calculating only the booth, maybe by appealing to the room design method OR take worse case scenario and add the considerable phantom gpm flow and 500 gpm hose allowance which would require major upgrades. Guidance and thought would be appreciated. Thanks, Anthony Johnson Mountain Fire Protection 'Saving Lives and Valuing Property' [https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png]<https://urldefense.com/v3/__http:/www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail__;!!FaxH778!YG5fQeYRGxZ0g7yGv65McYDjQl-5PuE_4DfW-o9VqUQjEeLunWeEm2lUcYCc_YrdXd_uoGIXuZMGDvWw6rEhFqL-mUY$> Virus-free.www.avg.com<https://urldefense.com/v3/__http:/www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail__;!!FaxH778!YG5fQeYRGxZ0g7yGv65McYDjQl-5PuE_4DfW-o9VqUQjEeLunWeEm2lUcYCc_YrdXd_uoGIXuZMGDvWw6rEhFqL-mUY$> 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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