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
