Where does the requirement to brace a sprig up at 4 feet come from?

Thank you-

Jeff Werre, CFM
Plan Review and Inspection Specialist

Development Services
City of Goodyear, Arizona
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From: Bob Caputo <[email protected]>
Sent: Thursday, October 19, 2023 9:41 AM
To: Discussion list on issues relating to automatic fire sprinklers 
<[email protected]>; George Medina Jr. 
<[email protected]>
Subject: [Sprinklerforum] Re: 1" Armover Restraint

⚠ This email arrived from an external source - Please exercise caution when 
opening any attachments or clicking on links

George,

An arm over to a single sprinkler is defined as an arm over whereas when two 
sprinklers are served, it’s considered a branch line. Branch lines require 
restraint. If the arm over is to a sprig up longer that 4ft, the sprig requires 
restraint.

I am not aware of a requirement to restrain the arm over (but if it’s long 
enough….)

I’m sitting in an airport without a book so there might be other opinions

Bob Caputo

On Thu, Oct 19, 2023 at 11:35 AM George Medina Jr. 
<[email protected]<mailto:[email protected]>> wrote:
I have an armover that is 2'-4" in length. The SEOR is requiring me to put a 
diagonal brace on the branch line that the armover is supplied from and a 
restraint on the armover ( I had left a branchline restraint detail from my 
template and I probably should not have left it on with these small aromovers) 
When is an armover required to be restrained (if at all?). Could not find any 
specific length in NFPA-13 (2016 ed.)


George Medina Jr.
Sr. Fire Sprinkler Designer
SINGLETON FIRE PROTECTION INC.
Office: (818) 252-5744
Cell: (323) 906-5701
Business Hours: 9:00am-5:00pm


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