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
