Bill,
We have never been forced to do any on drops, arm-overs and return bends
feeding one sprinkler. Only branch lines as defined.
We used to use the wire as shown in A9.3.6.1(a)&(b) . We now use the details
for A9.3.6.1(5)(a)&(b)
There are many ways to avoid excessive vertical and horizontal movement, but
we can be on the same page as the AHJ's when we utilize the suggestions
shown.
Typically as long as your are at your last vertical hanger (which has it's
place depending on length and pressures) with your restraint attachment and
either run the rod to the pipe or utilize a surge restrainer you are all
right.
As far as how many need to be installed, it is at the end of each branch
line as per definition (earlier than 2007 edition).
But remember these used to be called "end of line restraints" and now per
2007 they are branch line restraints and 9.3.6.4 sets the standard for
spacing.
Don't forget to check 9.3.7 for the do's and don'ts of attachments.
Hope I helped I got a little long winded.
Bobby Gillett
Project Manager
[EMAIL PROTECTED]
(731)-424-0130
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, June 18, 2008 1:54 PM
To: [email protected]
Subject: Restraint of Branch Lines
2007, 9.3.6.3 - The end sprinkler on a line shall be restrained against
excessive vertical and lateral movement.
1. Can I assume the word line means "branch line" based on the title of
9.3.6?
2. Would the end sprinkler include sprinklers on drops, arm-overs, and
return bends?
3. Would "excessive" be defined as using a restraint not listed for
vertical and/or lateral movement or not meeting 9.3.6.1(5)?
Someone has asked me to approve a particular brace but then I realized I
had no idea how many needed to be installed!
(Getting old but still learning)
Bill Brooks
William N. Brooks, P.E.
Brooks Fire Protection Engineering Inc.
372 Wilett Drive
Severna Park, MD 21146
410-544-3620 Phone
410-544-3032 FAX
412-400-6528 Cell
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