Have you looked at the Flexhead for duct? No need of access doors for head inspection, easy removal for inspection and cleaning or replacement.
Also remember that however much water you dump into this duct, the supports must be able to support that extra weight. Depending on how the system is set up to drain, it may end up holding more water at times than it is draining. Make sure you relate the potential amount of water present in the duct to the structural engineer and the mechanical engineer. No point in extinguishing the fire and then have the whole thing collapse due to weight. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Thom McMahon Sent: Monday, January 26, 2009 10:42 AM To: [email protected] Subject: RE: Calculating sprinklers in horizontal grease ducts Ron typically if you asked what to design to I'd say to calc all of the heads in the duct. Rarely see grease duct with more than 36x36 or 24x48. As far as density goes I'd calc a .20 but that really won't matter since the 7Psi will flow more than that except in a really large duct. We find in duct heads to be problematic, as each requires a fire rated access door, and the heads and duct never seem to be properly cleaned. I'd look for another alternative. Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Sunday, January 25, 2009 9:49 PM To: [email protected] Subject: Re: Calculating sprinklers in horizontal grease ducts Mike, ANSWERS IN CAPS and meet the intent? ALTHOUGH iIT MAY MEET THE INTENT IT DOESN'T MEET THE LISTING AND THAT'S WHAT I'M CONCERNED WITH. Any possibility of the UV duct hood cleaners and reduction of protection, i.e. what I've heard about the B.C. experience? THIS IS POSSIBLE--ROTO-CLONE, ELECTROSTATIC PRECIPITATOR, ACTIVATED CHARCOAL FILTER, ETC., BUT I'D RATHER AVOID THESE EXPENSIVE AND TYPICALLY MAINTENANCE NEGLECTED DEVICES. If you use sprinks, can you recommend a "watertight" duct system with enough slope to take the water to a "safe" place? Like outside? GREASE DUCTS ARE WELDED AND THEREFORE GREASE/WATER TIGHT BY DESIGN. EVERY TURN AND LOW POINT REQUIRES AN INSPECTION/CLEANING ACCESS PLATE (ALSO GREASE TIGHT) AND WILL THEN EITHER DRAIN BACK TO THE HOOD, AN ELBOW WITH ACCESS OR OUTSIDE. I'd calc every one of them....... up to the equivalent design area of the building. I'D CALC EVERYONE ALSO BUT WHAT I'M LOOKING FOR IS GUIDANCE ON THE HAZARD AND/OR DENSITY. On Sat, Jan 24, 2009 at 7:04 PM, Michael Fitz <[email protected]> wrote: > Ron, -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
