Fatigue Design for Vertical Vessel

You are going to have to have experience in this or you need to get a professional involved. The fact that you are asking this question leads me to believe that you don't have the required experience and background. India I'm sure has code standards for pressure vessel design that you must follow to manufacture a certified vessel.

Maybe you can find something here:

http://www.google.com/#num=20&hl=en&&sa=X&ei=VC43TMG8HcT7lweS3O3UBw&ved=0CBkQBSgA&q=pressure+vessel+design+indian+standard&spell=1&fp=f7d10796405a4c3

Mikerho,

Thank you for your reply. Let me clarify I do have the experience of pressure vessel design and we are certifed manufactures. But I am new to the fatigue design of vessels. That's why I am seeking help

Thanks

Hi brkmech,

You are most likely going to have to have extensive materials information for the MOC as well as a FEA package that can model the design. A search yielded this.

Best of luck!

Mike

banu....

If you were in the USA, you would use ASME VIII, Division 2 to design pressure vessels subject to (severe) cyclic service.

ASME VIII, Div 2 requires a more detailed analysis, imposes design limitations on nozzle designs and has more rigorous inspection and testing requirements.

I do not know what the Indian regulatory equivalent of div 2 is......however I would bet that it is similar.

Please have the decency to complete this thread and tell us what your final resolution is to this issue.

-MJC

Hello brkmech

BS 7606 : 1993 deals with this for steel structures, and I'd expect similar principles apply to vessels. You might find more up-to-date information on the web, but it gives an idea.

The charts in BS 7608 showing reduction of allowable stress with no. of cycles only start at 10⁵ cycles so I wouldn't expect 7500 to be a problem. If in doubt don't go too near the knuckle on design stress!

Cheers........Codey