The retroactivity clause in NFPA 13 should allow you to leave the 3/4" pipe.q
Sent from my HTC smartphone on the Now Network from Sprint! ----- Reply message ----- From: "Jarron Gass" <[email protected]> To: "[email protected]" <[email protected]> Subject: 3/4" Pipe and Sprigs Date: Fri, Jun 22, 2012 4:54 pm Folks, I am working on an older building, pipe scheduled system with ¾” pipe at the end of some lines as well as ¾” sprigs in some areas. As best we can tell, the bulk of the system is from about 1930. In NFPA13, 2011 edition it says the following: 22.4.1.2 Pipe sizes shall be no less than 1 in. (25 mm) nominal for ferrous piping and 3⁄4 in. (20 mm) nominal for copper tubing or nonmetallic piping listed for fire sprinkler service. This is referencing hydraulic calculations, but I seem to recall that there was a requirement somewhere in the standard to remove any ¾” piping and replace with 1”. If so, can anyone point me to the proper section and also, would that include the sprigs? It seems a little frivolous to remove the existing 1’-0” long sprigs and install an extra heavy close nipple with a ¾” x 1” reducing coupling, a short piece of 1” pipe and another reducing coupling. I appreciate any input. Thanks, Jarron Jarron J. Gass - J. & J. Fire Protection Co., Inc. 101 Powell Rd., Butler, PA 16002, (724) 586-6111, fax (724) 586-5151 emergency (724) 898-2481, <mailto:[email protected]> [email protected], <http://www.jandjfire.com> www.jandjfire.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120622/28498e45/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.gif Type: image/gif Size: 862 bytes Desc: not available URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120622/28498e45/attachment.gif> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
