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

thread775-374580

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

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

(OP)
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.....

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

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.

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

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.

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

(OP)
thanks a lot...

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

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=...

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

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