Per 13-2007 Figure A9.1.1 "Short Strap" is very like a fig 23 (Tolco but is
in fact not a Fig. 23 but a Fig 20 or 20S) If your using these there is no
problem with the "Hanger". The problem as I see it is that most wood trusses
are not that strong in the bottom cord. Has the Structural engineer approved
this applied point load on the bottom cord?
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, July 31, 2007 12:52 PM
Subject: RE: Pipe supported from truss
If there's no commentary in 13R check out NFPA 13, 2007, A.9.1.1 for
commentary on this subject and Figure A.9.1.1.
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 Matthew
J. Willis
Sent: Tuesday, July 31, 2007 2:11 PM
To: [email protected]
Subject: RE: Pipe supported from truss
But Is it being "hung"? 13 speaks to hangers and attachments. Can the
truss be considered a hanger? The only mention I see is 9.1.1.5.3 which
references "holes" in structural members. So do you need to provide some
sort of attachment on the top of the bottom chord? The use of hole
implies radial protection/support. The CPVC strap is attached to both
the pipe AND the structure, so a listing question could fairly arise. As
for the listing for CPVC only, of course that is for weight
consideration and for the no chafing bevels on the edges. I would be
very concerned if there is no restraint (for sprinkler activation not
seismic) on the system.
R/
Matt
Matthew J. Willis
Living Water Fire Protection, LLC.
1160 McKenzie Rd.
PO Box 877
Cantonment, FL. 32533
850-937-1850 Voice
850-937-1852 Facsimile
[EMAIL PROTECTED]
----- >On 7/31/07, Travis Mack <[EMAIL PROTECTED]> wrote:
----- >> In a 13R application, the sprinkler contractor
----- >installed the sch 40
----- >> steel piping so it is laying on the bottom chord of
----- >the trusses. He
----- >> then installed 2 hole straps (listed for CPVC only) in
----- >order to keep
----- >> the pipe from moving to aid installation. Do the
----- >straps have to be
----- >> listed for fire protection use? I was under the
----- >impression that since
----- >> the piping is laying on top of the bottom chord, it is
----- >not being
----- >> "hung." Therefore, the straps are merely for
----- >convenience. What do
----- >> y'all think? Bracing or restraint is not required by
----- >the AHJ in this area.
----- >>
----- >> Travis
----- >>
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----- >
----- >
----- >--
----- >Ron Greenman
----- >at home....
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