As an "Old Time Fitter" from the early 70's to the 90's before I got
into design, I was taught to use Sch 80 nipples for the additional
strength that they had over the standard Sch 40.
On 9/6/2013 5:53 AM, Bobby Gillett wrote:
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
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