Hanging Pipe in PEMB
Hanging Pipe in PEMB
(OP)
I have a piece of industrial duct pipe (12" Sch 10) that will hang from the roof of a PEMB. ASCE 7 doesn't give much guidance on this sort of thing, so I wanted to ask if anyone here can point me in the right direction.
Initially, I supposed I would put a vertical hanger with a diagonal to keep it from swinging wildly in a seismic event.
I can't imagine this hasn't been done before...
Thanks in advance for any help.
Initially, I supposed I would put a vertical hanger with a diagonal to keep it from swinging wildly in a seismic event.
I can't imagine this hasn't been done before...
Thanks in advance for any help.
-5^2 = -25
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RE: Hanging Pipe in PEMB
My task--sprung on me with one day's notice by my project manager--was to inspect all of the seismic bracing for all of the hanging pipes and ducts in the new headworks buildings at the local wastewater treatment plant. The headworks building is eight stories tall (half underground) and bigger than a football field. My task was to learn the requirements (I was starting from zero) and do the inspections over the weekend, so that come Monday morning the City could issue itself an occupancy permit. Needless to say, I was p*ss*d since I had plans for the weekend.
For guidance, my project manager handed me a copy of the SMACNA Seismic Restraint Manual, and that's the document you need. With SMACNA, the plans and specs, and binoculars, I got through the entire headworks in one long weekend. I needed the binoculars because some of the hanging pipes and ducts were more than thirty fee up.
I found so many problems, that the City couldn't issue itself the occupancy permit on Monday. It took the contractor more than a week to fix everything that I found was wrong.
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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill
RE: Hanging Pipe in PEMB
RE: Hanging Pipe in PEMB
My concern is that it's being hung in a PEMB. Is this a new PEMB or an existing one? A 12" pipe can get pretty heavy when full, and those buildings are designed as lean as possible. I've checked them for the addition of a lightweight RTU (essentially a little residential unit) and couldn't justify it - we had to install columns from the floor to reinforce it.
RE: Hanging Pipe in PEMB
PEMB's are notorious for being super sensitive to any increase in load, especially is the 12" pipe is filled w/ any sort of fluid.
RE: Hanging Pipe in PEMB
We did work through Chapter 13 and I couldn’t quite nail this one down. The pipe is dust collector exhaust ducting, so there is no liquid load. The PEMB manufacturer listed a collateral load of 5 psf - we are below that globally and have checked the individual members against details they provided for point loads.
We did find some proprietary products that will do the trick.
-5^2 = -25
http://www.eng-tips.com/supportus.cfm
RE: Hanging Pipe in PEMB