I don't have a standard available, I'm on a road trip, but I believe somewhere in 13 under hydraulic calculation methods is a paragraph which states that it is not necessary to include the fitting into which the sprinkler head is installed in the hydraulic friction loss calculation.
Mark at Aero 602 820-7894 Sent from my iPhone On Oct 27, 2016, at 3:31 AM, Russell & Carol Gregory <[email protected]<mailto:[email protected]>> wrote: I posted a message on this subject early this month but only received one reply(thanks Brad). This was surprising as I thought it was a serious problem if the full EQL for tee had to be added to calculations. Especially if the change was made on-site after design had been completed with welded outlets. So my query is as follows; When calculating a Range Pipe with welded threaded outlets for sprinklers it is not necessary to include a loss for the water leaving the range pipe and entering the sprinkler. The total pressure is assumed to apply to the sprinkler orfice. This means that a 80nb pipe with a 25nb outlet and a k36 sprinkler does not have an additional loss added for the outlet fitting. If I change my design and fabricate the 80nb range pipe with 80 x 25 Mechanical Tees for the Sprinkler outlet do I have to apply an additional loss factor for that fitting? The published EQL for Mech tees varies greatly between brands,( 0.8m up to 2.4m). This means a head pressure of 345kPa would need around 600kPa in the range if this additional loss is added. Questions; 1. Is it common practice in USA to use 80 x 25 clamp/mechanical tees for attaching large bore Storage Sprinklers directly to 80nb range pipes? 2. Is it common practice to add in an additional loss for the clamp tee, in the hydraulic calculation, where the sprinkler is directly fitted to the tee outlet? I would appreciate the Forum members advise as to what is the standard practice in the USA. Russell Gregory Christchurch New Zealand e-mail [email protected]<mailto:[email protected]> _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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