Vessel Skirt Design 2

[FabianoRosa]

I'm having trouble to define the required thickness of a vertical vessel skirt. I didn't find anything at ASME VIII Div I and the analisys seems to be very complicated without a FEM program.

The stress analisys is easy and can be made considering the bending moment and compressible loads. My problem is to deal with the buckling which seems to be the limitating factor.

Can anybody help me?

Thanks.

 

[jte]

Fabiano-

You're on the right track. Though Section VIII does not deal with support design, it is common to determine the compressive stress due to weight and bending and use Section VIII allowable longitudinal compressive stresses as the acceptance criteria. See VIII-1 UG-23(b).

jt

 

[FabianoRosa]

Ok, thanks.

So, those allowable longitudinal compressive stresses already take into consideration the possibility of buckling. Isn't it?

 

[LSThill]

Dennis Moss's design manual (3rd edition)

 

[jte]

Fabiano-

Yes, buckling is considered in the allowable compressive stress charts.

jt

 

[andy74]

If this can help You, I can send You EN 13445-3, there is a method for skirt calculation.
Andy

 

[FabianoRosa]

Thanks jt.

Isthill, I'll download this book. Thanks.

 

[SindelA]

This takes alot of work and I would suggest a program like Compress.

You will find it does a very good job for you and you can add additional loads where you wish.

They have a thread going here somewhere.



Regards,

Allen
Sindel & Associates

http://www.consulting.awsindel.org

 

[ElfEiken]

When I designed vessels many, many years ago, the book "Process Equipment Design" by Brownell and Young was the "bible" for skirt design. It has formulas for the skirt, the base ring, the bolting chairs etc etc. Computers in those days filled whole rooms, cost a fortune to run, and the engineer had to get all his data punched on cards. Much faster to do it with a good reference than to try and justify a computer run.

PS if I designed more than a vessel a decade these days, I would of course have a computer based design program.