I seem to recall that the 1/2" extensions were UL listed with the replacement sprinklers for Omegas when Central set up the replacement program, but I can't seem to find anything in writing to confirm that. Since this would be maintenance on an existing system, would any AHJ require calcs again? As to use in new installations, I have seen them used when the installer cut a nipple a bit short. Although not compliant with 13, i.e. 1" is the smallest steel pipe to which a sprinkler is supposed to be connected, I doubt that there would be much of a measurable impact on actual delivery. I have not seen any data to confirm that, though. Somewhat related would be the listing for dry sprinklers. One mfr shows, for example, k=5.6 for all dry sprinklers of that model up to 45 1/2" in length. So if nearly 4 feet of pipe does not impact the k, it seems unlikely that a 1/2" extension would be a big deal. Dave at Firetech Engineering Incorp. Ed Cyr <[EMAIL PROTECTED]> wrote: Dave,
I have never experienced any failures. This topic has brought up a question. Is the addition of these 1/2" or 3/4" brass extensions approved and in compliance with any NFPA standard? How do you calculate friction loss through these extensions? How many extensions can be applied to one sprinkler? Any comments? Thanks, Ed Cyr Alpha Fire Sprinkler Corp. San Luis Obispo, CA -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Killey Sent: Thursday, November 08, 2007 11:54 AM To: [email protected] Subject: 1/2 brass extensions We have had a few failures of the 1/2" brass extensions used by Central in the Omega recall program. Trying to get the name of the manufacture of these items. It is NOT stamped on them. So far we see two manufactures possible for the extensions. United Brass Works and K&K Screw Products. They are almost identical looking parts except one has more threads than the other. Anyone having any knowledge on how to identify who makes these items?? I would appreciate any input and hearing from anyone who has experienced any failures with these parts. Thanks Dave Killey Fire Busters Inc 7887 114 A St., Delta, BC V4C 5L8 Phone 604.599.4499 Fax 604.599.4319 www.firebusters.com email: [EMAIL PROTECTED] Canadian Sprinkler Forum:www.firesprinkler.ca _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
