AutoPIPE question

[Nounoue]

I am modeling a piping using AutoPIPE. There are several rod hangers. Each rod hanger had a gap of 100 in. Is there any easy way to perform the dynamic analysis with keeping these gaps?

 

[pennpiper]

Nounoue,
You wrote:"Each rod hanger had a gap of 100 in."
Are you real sure you meant to write "100 inches"?
Maybe, just maybe you made a slight mistake.

prognosis: Lead or Lag

 

[DSB123]

Nounoue,
The answer is no.

 

[Nounoue]

pennpiper, Thanks for replying, according to the ISO's there are 100 inches gaps, when I am running the model, I get an uplift of almost 40 Lbs at some of these rods.

 

[kacarrol]

Nounoue,

You're making me kind of nervous in light of the fact that you seem to be working on nuclear systems:

http://www.eng-tips.com/viewthread.cfm?qid=363493

I hope you have an experienced senior engineer to oversee your work.

K

 

[uaepiping]

As per Isometrics 100 inches gap. AND you still have not asked the guy who put it. You did not doubt it? You simply went ahead with it to do analysis?

 

[DSB123]

Nounoue,
In which country are you working on Nuclear facilities?

 

[Nounoue]

Iran

 

[Nounoue]

Thank you everyone for your feedbacks. I actually figure it out. based my discussion with the site, I was told that there are no gaps above the pipe, which contradict with the drawings. I performed dynamic analysis and found that some rod hangers are experiencing uplift forces due to seismic. since rods don't take compessive loads, we decided to remove one support, and modify three rods to guides, since there is space to make guides at these locations.

Thank you again