I get all that. But I assume most of the pressure in a sidewall is for throw and not width, how can we justify a significant decrease in pressure based on a decrease in width alone?
Sent from my iPhone On Dec 10, 2009, at 12:14 PM, <[email protected]> wrote: > What Roland has stated in both posts is correct.Most,if not > all,residential sprinklers are listed for 13,13d,and 13r in > residential applications.The minimum flow rates indicared in the > data is that which is required to generate flow and pressure to > achieve the spray pattern indicared.You still must discharge the > minimum flow rate (.05 or .10) while at the same time the minimum > flow from the table.If you happen to over-flow the head thats > o.k.,but you can't flow less than the stated minimum. > > Lamar V. > > > ---- Roland Huggins <[email protected]> wrote: >> 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: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: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)
