Duane, As I mentioned, I was going off of memory. Not sure where exactly the Sch. 80 came from, maybe it was an old requirement for seismic areas before the limitation of 1" diameter nipples was enforced?? May have been a company requirement before that as where I was before was in a "seismic zone"...not quite sure. Anybody else out there ever hear of that?
Bobby Gillett *Living Water Fire Protection, LLC* 1160 McKenzie Rd. Cantonment, FL 32533 (850) 937-1850 livingwaterfp.com <http://livingwaterfp.com/> On Fri, Sep 6, 2013 at 5:31 AM, Johnson, Duane (NIH/OD/ORS) [C] < [email protected]> wrote: > They are using an existing 1/2" outlet (likely an upright) to supply a > relocated sprinkler (likely a pendent)...completely legitimate. > > 8.15.20.4.1 (2013) When pipe schedule systems are revamped, a nipple > not exceeding 4 in. (100 mm) in length shall be permitted to be installed > in the branch line fitting. > 8.15.20.4.2 All piping other than the nipple permitted in 8.15.20.4.1 > and 8.15.20.4.3 shall be a minimum of 1 in. (25 mm) in diameter in > accordance with Figure 8.15.20.4.2. > 8.15.20.4.3 When it is necessary to pipe two new ceiling sprinklers > from an existing outlet in an overhead system, the use of a nipple not > exceeding 4 in. (100 mm) in length and of the same pipe thread size as the > existing outlet shall be permitted, provided that a hydraulic calculation > verifies that the design flow rate will be achieved in accordance with > Figure 8.15.20.4.3. > 8.15.20.4.4 Where an armover is attached to connect to a sprinkler, the > use of pipe nipples less than 1 in. (25 mm) in diameter shall not be > permitted where seismic design is required on the system. > > By the way, where did the sch 80 requirement come from? I have never been > able to locate that in code. > > Duane Johnson, PE > Program Manager > Division of the Fire Marshal (Contractor) > Office of Research Services > National Institutes of Health > 301-496-0487 > > "Protecting Science - One Sprinkler at a Time" > > > -----Original Message----- > From: Bobby Gillett [mailto:[email protected]] > Sent: Thursday, September 05, 2013 10:46 PM > To: [email protected] > Subject: Re: Shoulder Nipple > > Hoping they are requesting sch 80 and they are not in a seismic zone. > > Sent from my iPhone > > On Sep 5, 2013, at 9:12 PM, "JSM Fire Pro" <[email protected]> wrote: > > > You’re a third party glancing over a bill of materials for an > > add/relocate day job. You notice one of the line items is calling for > several ½” > > shoulder nipples. > > > > > > > > What goes through your mind? > > > > > > > > J. Scott Mitchell, PE > > > > B&W Technical Services Pantex > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.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 > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
