Interesting to those whom question "why" about everything- I did not wonder 'why grids but not trees' until a few years ago. I was getting nowhere on my own brain power so I asked and was told that grids have a trapped secondary main with aux drain and that helps get the air out so you do not have the air cushion like you do in a tree. Was the change made because of the increase in concern for getting the air out of both configurations these days?
Brad -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Wednesday, January 07, 2015 2:13 PM To: [email protected] Subject: RE: Pressure Relief Valve on Wet Pipe System Change to mandatory relief valve was in 2010. SL -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Aaron Peck Sent: Wednesday, January 07, 2015 3:46 AM To: [email protected] Subject: Pressure Relief Valve on Wet Pipe System I wonder if I've been doing it wrong all along since 2010, but NFPA 13, 2013 Ed. 7.1.2.1 require a pressure relief valve on ALL wet pipe sprinkler systems? I can't tell you how many times in the past none have been installed. Granted they might not have been all designed according to 2010+, but just surprised this hasn't jumped out at me before. Looking back the 2007 code mentions only in "gridded wet pipe systems" then 2010 eliminates the word "gridded" as well as the 2013 code reads the same as 2010. What's strange is my 2010 Hand book doesn't denote that as a changed section, actually none show up. Does the Hand book remove those that are there in the standard version? Well I learned something knew. _______________________________________________ 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
