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Pipe elbow stress modelling

Pipe elbow stress modelling

Pipe elbow stress modelling

(OP)
I have ultrasonic data for a thick walled elbow that show the pipe wall thinning (due to errosion / corrosion) however the wall thickness is non-symetrical at various cross sections and is more pronounced in the turn of the elbow.  From this data I can develop a 3-D model. I need to identify the maximum principal stresses in the elbow.  I have access to ansys and abaqus but there is no basic model for this application in the library of either program.  Does anyone know where I can obtain a base model for this application in ansys or abaqus or does anyone recommend another program for this application? Do I superimpose the thermal stress results with the hoop stress results? I have been required to use an FEA program to provide a look at the stress profile but should I pull out my Peng and Peng book and just look at the stresses where the wall thickness is a min?Thank you in advance for any help.

RE: Pipe elbow stress modelling


Take a look at API-579/ASME FFS-1.  What you are trying to do is considered a "Level 3" analysis.

However, there is such a thing as a "Level 2" analysis which does not require the use of FEA, and is ananalytical approach you can do on a spreadsheet.

I'd start with a Level 2 analysis, and only perform Level 3 if it is necessary.

All the best.



 

RE: Pipe elbow stress modelling

(OP)
Thanks Steve and Mr. Meyers for the lead.  I really did not know where to start.

Gene

RE: Pipe elbow stress modelling

(OP)
Mr. Steve or Mr. Meyers in the FFS-2 manual they reference a "MAT" - which is a design requirement temperature but it is never defined. Do you know what "MAT" refers to and how it is defined?

thanks
Gene

RE: Pipe elbow stress modelling

Check out paragraph 3.1.4.

RE: Pipe elbow stress modelling

TGS4 (Mechanical)

Thank you

Steve

RE: Pipe elbow stress modelling

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