RICK <rickb_jp@yahoo.com> wrote: Thanks for the insight John. In your case John, how do you select piping systems which must undergo analysis by stress analysis software considering the layout is done by an experienced piping engineer.
This is another million dollar question....
Many companies have standards based on NPS, temperature etc. Also some books on piping analysis also have similar guidelines.
The bottom line is this...
In order to establish whether a system will require a computerized numeric
solution or not you need the following information:
1)Geometry how flexible is the layout?
2)Boundary conditions i.e. restraints, hanger locations etc. because they also impact flexibility.
3Displacement data... temperatures the system will operate at as well as imposed displacements at the P.O.C..
Now at the beginning of a project all you will have is NPS and maybe some temperatures. You cannot intelligently throw lines out of the possibility of requiring analysis because even a line run straight between two nozzles at 140F may overload the nozzles.
So you need to have a very inclusive list which you then prune down as the design process goes on.
My experience is that Project engineers do not understand this and they want a simple answer when you do not have data to give out a said simple answer.
Some industries will have processes which will automatically lead to analysis of certain systems...
Power... Main and reheat stem into turbines are a given...
Refining: Overhead transfer lines from Cat crackers...
So my answer is vague but that's the way it is! Check out the statement in B31.3 as to what the code requires....
If all else fails rely on the code for your direction!
Have a Happy New Year
Best Regards,
John C. Luf
Cleveland Ohio U.S.A when I'm not in Austria
Member B31.3, Piping Engineer - Stress Analysis, Pipe Supports, Component Design, and Surge Analysis... and according to my daughters master of unimportant trivia
[Non-text portions of this message have been removed] Received on Fri Dec 30 12:48:00 2005
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