agreed but BOTH the listing flow and the 0.1 by the SXL rule must be evaluated as you indicated in your first message. Look again at the process assigned larger rectangle (16 x 20) for listing and smaller (18.5 x 12) for the SXL. Along with my prior message, the two should resolve the question in your mind.
Roland On Dec 9, 2009, at 4:05 PM, Todd - FPDC wrote: > This is a 13 system so a 0.10 is reqd. > > Sent from my iPhone > > On Dec 9, 2009, at 5:26 PM, Roland Huggins > <[email protected]> wrote: > >> 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:Sprinklerforum- >>> [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:Sprinklerforum- >> [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)
