Hi All,

WRC-107/297 Nozzle ASME SEC VIII local stress is so fast to check in Caesar-II; but outside Dsh/Dnz between 2 & 20 & Dsh/Tsh between 10 & 600, have any of you compared results with FEA models like ANSYS, NOZZLEPRO, FEPIPE etc to create a benchmark ?

FEA is good for prototype,for mass production, we like our Caesar- II WRC-107/297 module, may be in a modified Avatar (reincarnation) after benchmarking with FEA codes - Can't Coade take a lead in this direction ?

regards,

sambhu

I'm not quite sure what you mean by "avatar reincarnation", but we have no plans to perform FEA work to extend the WRC limitations. There are a number of reasons for this:

• We simply don't have the time to perform theoretical research or consulting engineering. We have our hands full just trying to keep up with code changes and requirements.
• We take published codes and procedures, and computerize them. So if someone disagrees with the theory, we direct them to the applicable code or standard.
• We do not make engineering decisions or recommendations for people. This would be like opening Pandora's box, which you can never close. Extending the WRC limitations would not completely resolve the issue, as someone will always hit the limit.
• And finally, if we did do this, and a problem or failure resulted, someone would attempt to hold us liable.

If someone else performs this study, and publishes the results (say in PVP), then yes we would use this information to modify the software, making it an option available to the user.

In the www.dynamicanalysis.com/pvp96a.htm I could locate such a comparison of FEA codes with ASME SEC-VIII Div 2 requirements & WRC-107 with a typical reinforced pad nozzle connection by Porter & Martens.

regards,

sambhunath banerjee

Ok, we'll take a look.

Mr.Sambhunath,

Comparing WRC 107/297 results with FE results can also be extended to the implementation of the ASME Sec VIII Div2 stress requirements using FE analysis. The concept of membrane and bending stresses is easy to implement with Plate and Shell elements , but using 3D Finite element analysis the concept of linearization is not simple and debatable. To add to it,some of the ASME requirements are itself a matter of debate in the design community for a long time.

I fully agree with Mr. Richard Ay that it is the job of individual or sponsored researchers to do find out these answers and the subsequent revisions of the existing standards or new standards can be implemented by COADE.

For your interest I can suggest you the website

www.eurodyn.com


Which has got extensive discssion on the implementation of the ASME DIV 2 stress requirements and FE analysis as well as the new European code recommendations.Papers by Hechmer & Hollinger as well as by Arturs Kalnins provide valuable information into this complex subject.


Anindya Bhattacharya