the comment was basically something like "Lateral braces can not be
installed to act as longitudinal braces for pipe sizes smaller than 2 1/2"
as per section 9.3.5.3.5."
When I asked how do you brace CPVC longitudinally since there are no
listed
longitudinal braces, I was told I should write a letter suggesting a
alternative method with load calculations backing my method. He then
stated
that what other contractors have done was, as he called it, "put hanger
straps on all over the place". I knew then this would not be easy.
It's a 3 story condo/apartment building. Something like 24 units.
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Matt what kind of job are you working on with CPVC piping on it?
Also what exactly is their comment? Could they be saying you don't need
to
brace it if it's under 2.5"?
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.lg.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Wednesday, April 04, 2007 2:19 PM
To: [email protected]
Subject: Re: Re[2]: CPVC & Seismic Bracing
Charles,
That's exactly how it was going to be done. For some reason the guy at the
State Fire Marshall's Office is hung up on the fact it says "2 1/2"".
Very
frustrating.
Matt
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| | Charles Thurston |
| | <[EMAIL PROTECTED]> |
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| | 04/04/2007 03:08 PM |
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Hello Matthew,
I did some seismic for CPVC here in SC a few months ago. Using the Afcon
Lateral brace for Longitudinal brace om 1 1/2" pipe. The part number is
#030/040 Sway Brace (Model K).
See Below
Main
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| 6" nipple with Cap Same size as the main pipe
T-Fitting > |--------)
| ^
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^Attach Brace here running along arrows.
I put this note on my drawings RIGHT below the detail picture (YOU need to
edit the values for YOUR piping):
T Fitting in pipe with 3" nipple and pipe cap for attachment.
T Fitting and nipple are same size as pipe run.
(8 locations)
We request acceptance of the proposed longitudinal bracing support as
detailed above as an alternate method of construction per State
Regulation 71-8300.12. We believe the proposed installation meets the
intent of longitudinal bracing requirements for this project.
The weight of 59 feet of 1 œ" waterfilled CPCV piping and 15 feet of 1"
waterfilled CPVC piping 83.603 and 10.125 pounds respectively
(1.417 lbs/foot for 1 œ" piping and .675 lbs/foot for 1" piping per
Blazemaster Pipe Dimensions and Weight table found on page 16 of the
April 2006 Blazemaster Engineering Manual).
If you need a detail for this look on the Afcon Site or contact me off
list
and I will dig it out and send it.
Wednesday, April 4, 2007, 1:09:02 PM, you wrote:
Roland,
That's exactly what I thought and tried to explain to the South
Carolina State Fire Marshall's office. They insist the piping has to
be 2 1/2" or larger.
Matt
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| | Roland Huggins |
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| | 04/04/2007 12:32 PM |
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the pipe size on the branch line is when a sway brace is REQUIRED for
the branch line. That criteria does NOT eliminate the requirement to
sway brace the main by use of an offset brace thus size is immaterial
(except for the brace being listed for the size of interest). If the
brace wasn't listed for 1 inch (which it is), then as the designer,
you'd need to size the starter piece to meet the needs of the brace.
Roland
On Apr 4, 2007, at 8:35 AM, [EMAIL PROTECTED] wrote:
I know this was discussed recently but I don't think this specific
point was brought up. Currently there is only one listed sway brace
for CPVC and it is a lateral brace. Now in order to provide
longitudinal bracing it was suggested to install a lateral brace on
the branch line within 24 in. of the main. However if you read
9.3.5.3.5 it states "...for lines that are 2 1/2" and greater in
diameter". So what do you do for a 13R system with lets say 1 1/2"
mains and 1" branch lines?
Matt Drewello
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