first off you are confusing the issue by stating 0.05 gpm/sf since these are not density/area sprinklers. The 0.05 gpm/sf is a minimum flow but it is often exceeded by the listed require pressure for a evenly assigned rectangle. AS in your case, the area for the 16 x 20 is 320 requiring only 16 gpm for the non-criterion 0.05 density. You identified the listing requires 22 gpm at 27.4 psi. So where's the beef?
Roland On Dec 8, 2009, at 7:38 AM, Todd Williams wrote: > 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) > _______________________________________________ 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)
