The other thing to remember is the residential heads are very good at preventing "Flash over" and do so by wall wetting. That is a very high percentage of the water must meet that wall 20'-0" away above the top 3'-0". Where as a QR head must put a high percentage of the water at the lowest 3'-0" of the wall. (Floor Coverage)
Different strokes, depending upon objective. Life safety vs. control mode. 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 I am reviewing a set of plans where the designer used residential sidewall sprinklers in 13 system (6 story apartment bldg). A particular room is 18'6 x 12' and he has a sidewall throwing the 18'6 and centered on the 12 ft wall. Since we have to use a 0.10 density, he based his design on 11.2.3.5.2. The listing for the sprinkler at the 0.05 density (16 x 20 sp) is 22 gpm at 27.4 psi. If we use the 0.10 density times the area as described per 8.5.2.1 (comment (2) in 11.2.3.5.2), we get 22.2 gpm at 27.9 psi. How can we expect to get twice the density at a an 18.5 ft distance out of the same flow and pressure by decreasing the width of a room? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2 _______________________________________________ _______________________________________________ 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)
