Bruce, Could you expand on “why” you would want the air to keep running?
Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: Sprinklerforum <[email protected]> on behalf of Bruce Verhei <[email protected]> Sent: Friday, January 12, 2018 10:25:17 AM To: [email protected] Subject: Re: Exhaust Air - Paint Booth Are paint spray operations at this booth supplied by drum or IBC-quantity containers located outside the booth? By that I mean as opposed to the more common small containers on integral to the hand held spray gun or small inline pot. It’s common to use a flow switch to drop power to pump connected to drum on waterflow. Without this fire can attack hose in booth. Pump sees this pressure drop as demand for product, and pumps remainder of drum or IBC (intermediate bulk container) into booth. Result from a sprinkler design point of view can be operation of dozens of heads outside booth. From occupants point of view they’re now in a fast occurring, if not fast spreading, fire producing dark smoke. I assume fully sprinklered building. I’d ask AHJ what they prefer. Total flood dry chem systems require fan shut down. But sprinklers do not. But some AHJ’s might require fan shut down. From a compliance point of view the AHJ and architect are trying to find a way not to count the entire quantity of liquid as being in Use. As an Alternative Material and Method ruling design, the AHJ has considerable sway. Two questions to resolve early are switch testing and retard setting. 5 seconds seems to be adequate to prevent unwanted alarms in my experience. For the record I would have preferred to leave the fan running. But you should call the fire plan reviewer for this project. Best. Bruce Verhei On Jan 12, 2018, at 08:20, Steve Leyton <[email protected]<mailto:[email protected]>> wrote: I would say “probably” but a detection is faster and certainly more conventional. I would actually defer to the electrician or EE who’s overseeing design/installation of building controls and ask them. From: Sprinklerforum [mailto:[email protected]] On Behalf Of JD Gamble Sent: Friday, January 12, 2018 8:16 AM To: [email protected]<mailto:[email protected]> Subject: Re: Exhaust Air - Paint Booth Sorry. Yes , spray booth. Flow switch specific to booth. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: Sprinklerforum <[email protected]<mailto:[email protected]>> on behalf of Steve Leyton <[email protected]<mailto:[email protected]>> Sent: Friday, January 12, 2018 9:14:22 AM To: [email protected]<mailto:[email protected]> Subject: RE: Exhaust Air - Paint Booth I assume you mean a spray booth? Is the flow switch peculiar to sprinklers in the booth or will it signal upon flow of any sprinkler in the building in which the booth is located? Steve L. From: Sprinklerforum [mailto:[email protected]] On Behalf Of JD Gamble Sent: Friday, January 12, 2018 8:12 AM To: [email protected]<mailto:[email protected]> Subject: Exhaust Air - PaintBoith Quick question When using a flow switch to shunt trip a booth, should the exhaust air moment be stopped as well? Get Outlook for iOS<https://aka.ms/o0ukef> _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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