Rectangular tank bottom to shell joint design & seismic evaluation

[mohammad1367]

Hello every body,

i have to prepare a calculation book for rectangular storage tank with following dimension (L * W *H) = 2500 * 2500 * 1500

Calculations for wall and bottom thickness and stiffeners size is base on this book : "Design of process equipment" ,By:Mahajan.

I have to offer calculation for the bottom to shell joint. i didn't have find any rules for it in ASME Section VIII. I will appreciate any help.

I am also involved in seismic design evaluation a the tank. in order to obtain base shear, first mode natural period of vibration should be calculated first. i will be appreciated if any one could suggest a procedure for finding natural frequency.

BR.

 

[MJCronin]

There are some other, similar calculation methods out there .....

http://www.eng-tips.com/viewthread.cfm?qid=39705

Why must you "offer calculation for the bottom to shell joint" ??? In a rectangular tank, this will be an externally stiffened joint. This requirement sounds like something required for a round, flat bottomed tank. Did the client or some MBA boss require this ?



MJCronin
Sr. Process Engineer

 

[mohammad1367]

Thanks for your reply MJCronin.

Unfortunately, the the client don't have enough engineering sight and knowledge.

So, I have to prove for him that the joint is stiffened enough.