Can you extrapolate from the table, I wouldn't. Can you calculate the
required section modulus for a 14 ft trapeze span, yes. Would you
want someone whose name ends in PE to sign off on it, definitely.
.
At 12:04 PM 5/20/2008, you wrote:
Forumites,
I searched the archives and didn't find a discussion on this topic.
Here's my question?
Can I extrapolate out beyond the 10'-0" length on the section modulus
required for trapeze in table 9.1.1.6.1(a) '07ed.?
A fitter called this morning wanting 14' trapeze hangers for 4" pipe. He was
placing the main in the wrong location but it brought up an interesting
question. I noticed that the section modulus has a linear increase with
trapeze length.
For 4" Sch 10 y=.085x, where y=section modulus & x=Trapeze length. So, for a
14' trapeze for 4" sch 10, would a 1.19 section modulus work?
Do I have to have the initials PE after my name to think these thoughts?
Thanks,
Randy Knutson
Shilo Automatic Sprinkler, Inc.
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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