Saddle Designs for Pressure Vessels

As far as I remember from using pressure vessel dimensioning, you may be able to design it, dimension, calculate tensions, simulate in FEA, etc...

... and after all, use ASME code for pressure vessels or the suitable standard code for the location the product is to be used to redo all the work and make it fit the standard.

thanks for your reply.but sorry i could'nt understand.i designed the required thickness for flange and the base plate for saddle.i couldn't know how to design the stiffener plate .snd which formula would be use for that.im doing only the manual calculation

The saddle at the lowest section must resist the horizontal force (f). The effective cross section on the saddle to resist this load is one third of the vessel radius(r)

f = KQ

where:

Q= the load on one saddle, lbs.

K = constant (if the contact angle for the saddle is 120 degress then use .204 for the K)

yes i understood but this is for finding the thickness of web plate in saddle the no of stiffener plate required is calculated by N=(m/24)+1,where m is length of base plate. i want to know about the required thickness for stiffener plate. can any body give the material for studying the saddle design., regards, sankar

Please see page 965 in this paper:

http://www.codeware.com/support/papers/zick.pdf

Is that what you are looking for?

thanks for your material.this i have read before.its about the ring stiffener which to be provided nearby to saddle in the shell .but i'm asking about stiffener plate which to be provided for strengthening the web plate in the saddle.its not in this material. is there any other material to know briefly about saddle design.

My only other suggestion would be to get a hold of a couple of key pressure vessel books. The only other free information I could find on the 'net is this spreadsheet:

http://cfs6.blog.daum.net/upload_control/download.blog?fhandle=MEZMejdAZnM2LmJsb2cuZGF1bS5uZXQ6L0lNQUdFLzAvMjMucGRm&filename=23.pdf&filename=SadDemo1.pdf

Which you may be able to decipher (which is kind of risky anyways), but I think you will still need the referenced "Pressure Vessel Design Manual" by Dennis R. Moss

thanks for your reply.i also read the design manual book by dennis.r.moss.but in that stiffener plate is mentioned as rib plate.also there is only graphical representation to find the rib plate thickness.is there any standard formula.

Give me some time to go through my material - the one item I am particularly looking for is an article "How to Design Saddle Supports for Horizontal Vessels" in Hydrocarbon Processing - November 1972

Alright ....................... _(phew)

After going through a pretty extensive search through literature, which even included a trip to the local library (more on that later) I have found this -

I take it that you have the "Pressure Vessel Design Manual" by Dennis Moss and found that you want another design approach - so I won't discuss it; and as you probably already know, most of the literature surrounding this topic is of a prescriptive nature.

The best material I found is in the TEMA Standard 8th Ed - Section 10: RGB-G-7.11

(NOTE that the 9th Ed seems to be watered down a bit and they omitted a lot of the good stuff)

The second best reference would be: Mechanical Design of Process Systems - Vol 1 - Piping and Pressure Vessels; A. Keith Escroe; Gulf Publishing Company; Page 174

Third Best: Pressure Vessel Design Handbook - 2nd Ed; Bednar - Page 182

I was disappointed I could not find the Hydrocarbon Processing article so I have ordered it from the archives at the library. I should have it in a day or so and I could pass it along. I also want to check a few more journal articles (I already went through some looking for your specific question) and if I find anything more I will let you know.

Note that my search excluded the European Standards as I don't have access to them - but off the top of my head I believe there are some good design calculations in some of them that may have what you want.

dear sir, thank you very much for your effort to collect these details.but unfortunately i didn't have that materials to read.one small request regarding this can you please sent that referred pages of design.it should be helpful for me to conform the design.

If you post your email address in your user profile I will send you the applicable pages.

s.i have posted my mail id.if you made it here .it could be useful for others to know the design of saddle

True enough - I guess we can just "conveniently forget" any copyright laws

You download the referenced material here:

http://ifile.it/pstilmv

Note: as a bonus I also included a European standard that had slipped my mind.

thank you very much for your effort and the materials.it should be useful for all.

Hi again,

I tracked down the Hydrocarbon Processing article - you may download it here:

http://ifile.it/ynzo9xb

When I get some more time I am going to browse through some old journals looking for pertinent literature - if I find anything I will post it here as well.

hi. The link is not active. Can you please reload the article on a new location or please send it to sharjeelfaiz@gmail.com thanks a lot. i really appreciate it. Sharjeel

where can i find this spreadsheet? thank you. Mike