Thanks Ken, We increase the area 30% for dry because it takes the water 30% longer to get to the head after it goes off. The inequality I see is in saying the water will take 200 times longer to get to the head in the dry example, since slope and response time based on height are equal in both cases. If I was going to suggest something, it would be to add a 5th parameter to QR Reduction- either "max slope = 2/12", or "wet, except dry is ok if unoccupied attic not exceeding 20'". I prefer the latter, with my apologies to Tyco :) Thanks again!
-----Original Message----- From: ParsleyConsulting [mailto:[email protected]] Sent: Monday, February 07, 2011 12:23 PM To: [email protected] Subject: Re: a glaring inequality in 13? Brad, I'm not sure I see a "glaring inequality", since the allowable reduction for using quick response sprinklers would not apply to dry systems. The increase in remote area for the pitch of the roof is applied equally to both wet and dry systems. The increase for dry systems is only applied to dry systems [perhaps obviously]. The reduction for quick response sprinklers is not allowed for dry systems. Are you suggesting that it should be? PARSLEY CONSULTING Ken Wagoner, SET 760.745.6181 voice 760.745.0537 fax [email protected] <mailto:[email protected]>e-mail www.ParsleyConsulting.com <http://www.ParsleyConsulting.com>website On 2/7/2011 9:50 AM, Brad Casterline wrote: > I would appreciate thoughts and comments from all willing to take the time: > > Combustible attic, 4/12 slope, 10' to peak. 1500*1.3=1950 for slope exceeds > 2/12. Light Hazard, so QR heads required. If DRY, 1950*1.3=2535. If WET, > 1950*.6=1170. (QR Reduction). Doesn't this mean the area has to be increased > over 200% for DRY, not 30%? For 20' to the peak, 1950*.75=1463~~ 170% > increase for DRY. Using SSU, the increase would be for the exact same > spacing and height in both cases. BB and SD Attic heads 'increase' the area > 30% for DRY (from 5 to 7 heads), but without regard to height, and the slope > MUST be minimum 4/12. They must be within 6" each side of the peak, at 6' > max. SSU also have to be within 6" each side, and 8' max is cheaper than a > pump. I know this has not come up in the 16 months since I discovered the > Forum. If it did before that, I would appreciate being pointed to the > location of all discussion about it. > > Many thanks, > > Brad > > _______________________________________________ > 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)
