Chris is right! There are many ways to skin this cat, and all of them are OK if properly applied, which it sounds like you're doing.
Just as you could use room design, area density or residential design. Since your using area density, there is no requirement that you use the reduction in area for QR. The increased area for Dry, concealed combustible construction or slope ceilings are requirements. 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 Chris Cahill Sent: Thursday, May 13, 2010 8:25 AM To: [email protected] Subject: RE: 1500 sqft vs 900 sqft Nope as designer it's your choice. There is/was something in 13 that says to the effect when there are many ways to skin the cat all are not equal but are acceptable. Having trouble finding the exact section this morning so even if not in 13 the point remains. Think of all the different ways to cover a particular storage arrangement. In-rack, OH only, ESFR, large drop, and now CSMA. I bet there are plenty of things with at least 5 different acceptable minimums. I bet each has a slightly different expected loss. And how many heads do you expect to actually operate in a real fire? I'd bet either calc you have an 11 head safety factor. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Thursday, May 13, 2010 9:08 AM To: [email protected] Subject: 1500 sqft vs 900 sqft I am calculating a redesign for some apartments on the 18th floor of a building. 13 system; commercial QR sprinklers. There are a lot of closets and small rooms within the area. If I calculate the 900 sqft with the QR reduction, I am calculating 13 sprinklers. If I calculate 1500 sqft and can eliminate the closet sprinklers from the calc, I am also flowing 13 sprinkler, but have few heads per branch line and therefore the system requires less water. The 900 sqft is actually more demanding, in this case. Is this something that should be checked for in calculating the most hydraulically remote area? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, CT 860.535.2080 www.fpdc.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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 [email protected] http://fireball.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 [email protected] http://fireball.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)
