Thanks Ron. This is exactly the type of information I am looking for.
In this case the supports have to be engineered but it would be nice
to defend as few broken rules as possible. The spacing is 10 feet
and 5 feet, so the loads are low and the preliminary back of envelope
stress numbers look just fine, even for seismic. If push comes to
shove we'll have one mocked up to a 350 pound block and pick it up
with a backhoe, though I am not sure the 250 added load makes sense
when the pipe sits on top of the beam.
I am curious what strap was "listed" if it is a strap for unistrut?
Thanks,
Allan Seidel
St. Louis, MO
On Jun 7, 2008, at 2:17 PM, Ron Greenman wrote:
Allan,
I just ran into this and was surprised. Typically what I've seen is
drop-in anchor or red-head holding down the strut then a strut clamp
for the pipe. Had an AHJ recently say that strut wasn't listed and low
and behold it's not. you'll find a table that gives values in the case
of trapeze so that you can calculate the material in accordance with
13 for trapezes but that's it. What we did was use a drop-in then a
rodded up through the strut, through the holes of a pipe strap and
then captured the strut and strap with a nut. This was OK to the AHJ
since the strap was listed and the strut was merely a block. I
suppose we could have used a treated 2x4 or one of those rubber blocks
the plumbers used for the stand-off and done just as well or better.
In fact there's a job with pipe on the roof that we plan on using the
rubber blocks on. I'd check with your AHJ to see what he'll allow.
This guy we had through me. Hope this helps.
On Sat, Jun 7, 2008 at 10:28 AM, Allan Seidel <[EMAIL PROTECTED]>
wrote:
A sprinkler system, both mains and branch lines, will be supported
entirely
from below. There will be no hangers and supports will occur at
least every
ten feet. NFPA 13 does not seem to address this condition in any
detail. I
can think of many ways to support and anchor the piping. The
problem is I
need to know what methods are not permitted. For example, is
piping strapped
to a unistrut, point-load style, technically not permitted?
Thank you,
Allan Seidel
St. Louis, MO
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Ron Greenman
at home....
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