What are points to be considered while stress analyzing a pipe which have D/t ratio more than 100?

[1anuppiping1]

Dear All,
I have a query. Will be thankful if you clarify my doubt.

While stress analysis of a line with D/t ratio more than 100 (48 inch flare line with standard wall thickness) using Caesar II, i found a warning that the SIF calculations are not proper. So sifs can be calculated using FE-SIF. What other considerations i should make while analyzing such lines?



Thanks in advance.....

 

[DSB123]

Thin walled lines are prone to local buckling which Caesar does not check. You need to check that buckling will not occur. Also local loads at pipe supports - again Caesar does not check.

 

[B.L.Smith]

I had have similar case. As DSB123 told CAESAR II does not check local stress and failure. You should use a finite element software for your case, such as ANSYS or ABAQUS. It should be mentioned that, SIF warning is a small portion of your problem, and big portion of your problem is stress of pipe at support and whereas there is a point load.

 

[1anuppiping1]

thanks a lot...

 

[MJCronin]

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=8284

PAULIN has offered FEA tools(FE/Pipe) specifically developed to evaluate this type of situation

http://www.paulin.com/

Tell us more about your situation...... technically, with very low pressure systems, I believe that you do not fall under the piping code rules



MJCronin
Sr. Process Engineer