Right. I think the question was answered with the suggested heads (I haven't looked at them yet) than can be used at .15 in oh2 with a larger remote area.
Thanks Greg Sent from my iPhone On Jun 30, 2013, at 10:22 AM, "Cahill, Christopher" <[email protected]> wrote: > Correct, you still calc them but take the flow hit in the main not the flow > and pressure hit in the RA bl. Often this looks like feeding the new heads in > the RA from a bl connection 3 or 4 lines over. Vice versa if there are a lot > of heads to be added. > > Chris Cahill > Burns & McDonnell > Fire Protection Engineer > 952-656-3652 > [email protected] Ron Greenman wrote: > Chris can tell me if I'm reading too much into what he said, but the > picture I got from his suggestion was putting in a new branchline to supply > the new heads. That would be less demanding than adding those heads to > existing branchlines. If the heads are in the design area then they have to > be included. > > > On Sun, Jun 30, 2013 at 7:46 AM, Greg McGahan <[email protected]> wrote: > >> I don't see any way you can avoid these heads being in the remote area no >> matter how you feed them. >> >> With the new heads the spacing in the center of the grid will be 10 x 20. >> >> Sent from my iPhone >> >> On Jun 30, 2013, at 9:22 AM, "Cahill, Christopher" <[email protected]> >> wrote: >> >>> I assmue you are cutting heads into the existing bl's causing you to add >> another head to the bl on the calcs. You can always run a new bl such that >> the flow never hits the existing bl in the remote area. More costly? A >> little but cheaper than replacing the existing system. >>> >>> Chris Cahill >>> Burns & McDonnell >>> Fire Protection Engineer >>> 952-656-3652 >>> [email protected] Greg McGahan wrote: >>> Hello, >>> >>> We have an existing system installed 20 x 20 with 14.5K ECOH sprinklers. >> They have now installed a new wall separating the space into 2 spaces and >> left the sprinklers overspaced off the wall. The Calc plate indicates that >> the design was originally .15 fpm over 2,000 soft and when we re-calc the >> system we are nearly identical to the results recorded on the data plate. >> If we calculate it at .20/1,500 it does not work. >>> >>> Question is how to we even begin to sort this out in order to add a row >> of new heads to correct the overspacing? The new sprinklers all seem to be >> specifically listed for .20 (OH2) and i do not see a loophole to utilize a >> lower density and a larger Remote Area as in the original design. I also do >> not see an allowance in 13 for such a scenario (similar to the allowance >> for modifications to existing systems with residential heads that were >> originally designed for less than 7 psi end head pressure) >>> >>> I do not think there will be any salvaging this system if we cannot >> reduce the density… >>> >>> Thanks for any help, >>> Greg >>> >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > -- > Ron Greenman > Instructor > Fire Protection Engineering Technology > Bates Technical College > 1101 So. Yakima Ave. > Tacoma, WA 98405 > > [email protected] > > http://www.bates.ctc.edu/fireprotection/ > > 253.680.7346 > 253.576.9700 (cell) > > Member: > ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC > > They are happy men whose natures sort with their vocations. -Francis Bacon, > essayist, philosopher, and statesman (1561-1626) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
