[SML] pipe grid question

[Richard John Archer]

Thanks Bill.   I will go though and see what the engineers were looking at.  Like I said,  30 years and no one has had a problem.   Must have gone through some type of check when they opened this place in 1988.  I will see if we have documentation,   but as I alluded this place went under extensive “value engineering”  after the first bids came in about $4million over estimates of a $16million budget.  They brought in some other construction management firm ( run by a Cornell grad and friend of the VP in charge of new construction….imagine that…)    …fired the costs consultants (before finding out why the bids were high) ….pretty much kept everyone else out of the loop……and by the time they were done with all the “value engineering” and time delay to do new drawings and specs,  the building  now was only $9 million over….they built it using the “value engineered”  plans.   Architects threatened to take there name off etc etc…Went from Colortran to Strand Century in the middle of construction so we have Colortran raceways but Strand dimmers ( and now ETC  boards).  Windows in middle of hallways because  they changed the location of a room but I guess never try to figure out why it had a window….some exits never really did meet fire code (and still don’t).  Cut a whole floor of office space.  Cut 10’ off the grid.  Moved the building 10’  south  of the original placement which , of course, the architects really loved when the building didn’t line up to it’s neighbor.   Cut trap room,  cut hydraulic orchestra lift  then decided to add it back in but found out they couldn’t  but it back in because they put a mech room under the lift ( we have a lambda lift) ,  decided 65+ feet of travel wasn’t too long for a hydraulic elevator ( maybe not but running the hydraulic lines under the proscenium seating was a bad idea  …we don’t use the elevator during performances) …  we do have some sound isolation thanks to Artecs constant  “yelling”…...etc  etc   etc….

Short of it is I’m not sure there is final documentation  for  what pipe clamp to use on the grid or which idiot decided to use those.  


Maybe I can replace one to one with clamshell type ….if holes line up?  Likely Clancy hasn’t changed the design  for the 30 years I’m looking at.      Maybe we just have CU come in and weld the half clamp  to the pipes?   

Anyone know if clamshell clamp for H&H  is close to same size?  …if I’ve got to replace may as well buy clamps that hold  more


DickA
TD, Cornell U

….BTW  of course , we have a production in there in a couple of weeks  and  would like to hang a few more than  the twenty of thirty lights the engineers are suggesting.  



> On Oct 9, 2017, at 1:50 PM, Bill Conner via Stagecraft <stagecraft at theatrical.net> wrote:
> 
> How many and what is spacing of hangers?
> 
> And the half pipe clamps are the only thing holding it except perhaps
> flanges at the wall?  One for every 6' of pipe is around 30plf. (50 x
> 50 - say 13 pipes each way - 1300' - 200 units around 15 pounds
> average - 3000 pounds.  <4000 pounds of pipe.  How many hangers?)
> 
> I'm inclined to agree the half clamp is not a good choice but perhaps
> some solace in that the RWL is probably based on 8:1 or 10:1 and that
> they have been there a long time. I do worry that we may see a few
> failures as folks change to LED - which nearly is between 1.5 and 2
> times the weight if you replace 1 for 1.
> 
> -- 
> Bill Conner Fellow of the ASTC
> 
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