Even with steel pipe, you may find that you need to grab the hanger and not
the pipe. I did a simple empirical test with a 1'' pipe supported at
maximum spacings a few inches above the ground with a threaded tee in the
centre. Had a 220# plus guy stand on it and found that the pipe deformed
severely at the joints. (Can't remember if it snapped.)
This was to prove that the requirement of the standard is for the hangers
to be able to carry the 250# load and not the pipe.
Regards
Chris Mak
Sprinkler Certification Manager
Aon New Zealand
Level 1, 4 Fred Thomas Drive,, Takapuna
DDI: +64 9 486 9761 | Mobile:027 434 4058 | Fax:+64 9 486 0112
"George Church"
<[email protected]>
Sent by: To
sprinklerforum-bo <[email protected]>
un...@firesprinkl cc
er.org
Subject
RE: trapeze hanger, PVC
05/08/2009 03:46
a.m.
Please respond to
sprinklerfo...@fi
resprinkler.org
Grab the hanger, not the pipe. Another reason to have smooth edges on CPVC
hangers!
glc
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Todd
Williams
Sent: Tuesday, August 04, 2009 11:10 AM
To: [email protected]
Subject: RE: trapeze hanger, PVC
Something to think about. Hangers are designed to take 5x wt of water
filled pipe +250 lbs. The 250 is supposedly to support a fitter if he
had to grab on to it in an emergency (or so I have been told). Has
anyone looked into if CPVC pipe could support a 250 lb person, even
with hangers designed for it?
At 10:54 AM 8/4/2009, you wrote:
>Why not just calculate the modulus using the methods in NFPA 13 and then
>size your trapeze pipe accordingly. Or, as George said, use the values
>for steel and just have some oversized trapeze bars.
>
> > Assuming CPVC weighs less than steel pipe, use values for steel and
you're
> > safe. If you're near a head, make sure you're protecting against upward
> > movement if needed.
> >
> > When we get into bar joist construction, we often switch to steel since
> > hanging issues often make it a better installation all around.
> >
> > glc
> >
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of
> > [email protected]
> > Sent: Tuesday, August 04, 2009 9:03 AM
> > To: [email protected]
> > Subject: Re: trapeze hanger, PVC
> >
> > Greg,
> > If you are in a position to require trapeze hangers on cpvc,maybe you
need
> > to reconsider using steel pipe for stability and rigidity.Just a
thought.
> > ---- Greg McGahan <[email protected]> wrote:
> >> Have we ever discussed the use of trapeze hangers for cpvc piping?
> > Specifically, modulus requirements etc?
> >>
> >> Greg McGahan
> >> Operations Manager
> >>
> >> Living Water Fire Protection
> >> 1160 McKenzie Road
> >> P.O. Box 877
> >> Cantonment, Florida 32533
> >> (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231
> >> [email protected]
> >>
> >>
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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