I'd agree with Thom here in that the intent would be the size of the threaded fitting going into threaded outlet and not whether that thread was on a nipple or a street ell. Maybe stating street ell along with nipple was because street ells are rarely used, no one thought of it, or that the thread size being the issue was implied.
On Wed, Jul 29, 2009 at 11:31 AM, Thom McMahon<[email protected]> wrote: > The "California" ells and tee's I'm familiar with would go from 1" male > thread to either a 1" FM inlet or a 1/2" FM inlet. They differed from a Std. > street ell in that they were a longer pattern. I still have a few on the > shelf, but I don't think anyone is making them currently. The one's I have > came from Central/TYCO about 8 to 10 years ago. Unfortunately what you want > is a 3/4" male thread to avoid replacing the existing branch line tee, that > then has a 1" FM inlet. This would avoid the 3/4" nipple exclusion is a > seismic zone, because there is no 3/4" fitting exclusion. > > My thoughts are this is a bit suspect as an approach, to avoid replacing > existing branch line tee's. The apparent reason to limit the nipples to 1" > is that the forces in a seismic zone are too great for a 3/4" pipe thread to > survive. Having said that the 3/4" male thread on a fitting is just as weak > or weaker than the thread on a nipple. > > MY 2 cents Canadian and worth every penny. > > Thom McMahon, SET > Firetech, Inc. > 2560 Copper Ridge Dr > P.O. Box 882136 > Steamboat Springs, CO 80488 > Tel: 970-879-7952 > Fax: 970-879-7926 > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Allan Seidel > Sent: Wednesday, July 29, 2009 10:30 AM > To: [email protected] > Subject: 8.14.19.4.4 (2002 NFPA 13) and 3/4" x 1" California 90 Ell (90 deg. > red. street elbow) > > Taken literally, 8.14.19.4.4 (2002 NFPA 13) prohibits piping nipples less > than 1" when revamping a 3/4" outlet to a 1" drop in seismic areas. The > standard does not include fittings in its 8.14.19.4.4 statement. I take it > that using a 3/4" x 1" California 90 Ell fitting (90 deg. red. street elbow) > to revamp a 3/4" outlet to a 1" drop is permitted in areas subject to > earthquakes. Is that why its called a "California" fitting? > > Allan Seidel > St. Louis, MO > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
