Bill,
You are correct about "the hanger means restraint", but typically what we
run into is if it is short enough that it doesn't require a hanger, then the
AHJ's don't require the restraint....it usually has to be "horizontally
challenged" (short) not to require a hanger in a seismic zone, especially if
the pressure exceeds 100 psi.
Bobby Gillett
Project Manager
[EMAIL PROTECTED]
(731)-424-0130
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Thursday, June 19, 2008 11:49 AM
To: [email protected]
Subject: RE: Restraint of Branch Lines
Bobby,
Thanks for holding this dead horse down while I beat it some more.
I don't necessarily agree with your statement that hanger = restraint.
9.3.6.3 says nothing about any hanger - only that the end sprinkler on a
"line" shall be restrained and there's nothing in 9.3.6 that links a
restraint requirement with a corresponding hanger requirement. In my
previous message I stated that I've assumed "line" in 9.3.6.3 means
branch line and if so this additional word (branch) should be inserted.
Otherwise the term line would have to be defined independently of the
other terms in 3.5.
Hopefully the rejected proposal referenced by Roland will allow 9.3.6 to
be clarified and perhaps an Appendix note crafted to state the intent.
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
-------- Original Message --------
Subject: RE: Restraint of Branch Lines
From: "Bobby Gillett" <[EMAIL PROTECTED]>
Date: Thu, June 19, 2008 12:15 pm
To: <[email protected]>
Roland,
But it is not an arm-over if it is a horizontal pipe (not a return bend,
drop or sprig) fed from a cross main...it is, by definition, a branch
line.
You must restrain it if it is required to have a hanger.
Bobby Gillett
Project Manager
[EMAIL PROTECTED]
(731)-424-0130
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Roland
Huggins
Sent: Thursday, June 19, 2008 11:01 AM
To: [email protected]
Subject: Re: Restraint of Branch Lines
so would you restrain one and not the other? I still think the
restraint does not apply to an arm-over regardless if it is tied
directly to a cross main or a branch line. Short is short (or should
I say vertically challenged?).
Having said that, I have given up on trying to say what any large
group will ultimately decide (that being the technical committee)
until it's done. I will look to see if there is a proposal that we
can attach a comment that will clarify this issue come the Sept ROC
meeting.
Roland
On Jun 19, 2008, at 8:41 AM, Steven P. Biship, P.E. wrote:
>> So if you have a single sprinkler fed from a horizontal pipe from a
>> cross
>> main this would be a branch line. If you have a single sprinkler
>> fed from
>> a
>> horizontal pipe from a branch line this would be an arm-over.
>>
>>
>> Bobby Gillett
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