[SML] pipe grid question

[Richard Niederberg]

Dear Dale,
Well, I am a lawyer, and one suggestion is to keep a copy of the
engineering drawings stamped with the engineer's seal on it, then make sure
that the engineer receives a copy of the manufacturer's specification.
sheet.
/s/ Richard

On Mon, Oct 9, 2017 at 8:14 AM, dale via Stagecraft <
stagecraft at theatrical.net> wrote:

> In a pipe grid, the 90 degree clamps only normally hold loads that are
> side loads from when people are up there moving things around, when the
> building vibrates, and during collapse scenarios.  So they don't actually
> need to be super high rated.
>
> The things that carry the vertical load are the threaded rods and the
> fittings on each end of the rods.   if your pipes are secured to the wall,
> those might also be a load path.
>
> I Am not a structural engineer or a lawyer, so don't claim me to be an
> authority.
>
> Dale
>
>
> Sent from my Verizon 4G LTE smartphone
>
>
> -------- Original message --------
> From: Richard John Archer via Stagecraft <stagecraft at theatrical.net>
> Date: 10/9/17 11:56 (GMT-05:00)
> To: Stagecraft Mailing List <stagecraft at theatrical.net>
> Cc: Richard John Archer <rja10 at cornell.edu>
> Subject: [SML] pipe grid question
>
>
> University engineers are looking at the pipe grids in our spaces (not yet
> in the proscenium)  .   Seems like an odd time after 30 years in the
> building ….but…
>
> Grids are all  kind of typical looking …..two way #40  1 1/2” pipe grid ,
> cross grid connectors (so one direction of pipe below the other direction)
> ,  a bit over 4’ x 4’ spacing….beam clamps with 1/2” threaded rod
> seemingly  spaced appropriately  The problem is with the  pipe clamps….most
> appear to be JP Clancy   half pipe clamps (or other manufacturer? Clancy
> did Proscenium rigging).  Half pipe clamps only have a 200 # RWL  .  Why
> would anyone install these in a grid?  ….they just adequately  hold up the
> pipe weight.    Am I missing something here?    Was this some Cornell value
> engineering at it’s finest?  I’m sure original theatre consultants wouldn’t
> have spec’ed this (ARTEC)
>
> Needless to say, we’ve been hanging  up to maybe 200 fixtures in there for
> years.  Biggest flexible space is about 50 x 50.
>
>
>
> DickA
> TD, Cornell U
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-- 
/s/ Richard
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