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Member

Join Date: Jun 2008
Posts: 7

deisgn of inclined equipments

08/07/2008 2:42 PM

Dear all,

I have to deisgn an heat exchanger with 2 saddle supports,now the heat exchanger is horizontal with inclination of 200mm,thus LHS saddle is 200mm larger in height than RHS saddle.

As there is height difference in saddle naturally stress on the saddle as well as on the heat exchanger shell will be acting differentally,(will be different for both the saddles).

I didn't found any design reference for such inclined vessel deisgn on saddle ,i did gone through,pressure vessel design habd book by-Denis R Moss/Henry Bednar/Megyassay.But all these books are silent upon such design.Can anybody help me to design such saddle supports or how stresses induced in shell can be verified.

Requested to help me come out of the challenge

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Anonymous Poster
#1

Re: deisgn of inclined equipments

08/07/2008 9:14 PM

Apart from going with computer software / FEA analysis:

Did you look at the following book:

Pressure Vessel Design

by: Donatello Annaratone

Published by Springer


You might be able to work with chapter 9 - particularly Section 9.2: Local Effects of Forces and Moments on Cylinders.

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Member

Join Date: Jun 2008
Posts: 7
#2
In reply to #1

Re: deisgn of inclined equipments

08/08/2008 2:17 AM

Dear Sir,

Kindly accept my thanks receipt for the guidence,

Since that book is not available at the moment to me,can you pl provide extract of that particular chapters.i am asking for your precious time in helping me.

Looking forward for your generous cooperation

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Anonymous Poster
#3
In reply to #2

Re: deisgn of inclined equipments

08/08/2008 8:51 AM

I placed the relevant sections online - please see the following sites for download

http://ifile.it/ct8qlun

http://ifile.it/iz2wten

If there is anything else, please get back to me

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Anonymous Poster
#4
In reply to #2

Re: deisgn of inclined equipments

08/08/2008 11:07 PM

Avina,

Did you find that information useful - I have more if need be.

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Member

Join Date: Jun 2008
Posts: 7
#5
In reply to #4

Re: deisgn of inclined equipments

08/08/2008 11:56 PM

Dear Sir,

Extremely thanks for the links ,i got it from there.but this book also does not provides clear idea or design guidelines for design of inclined vessel or saddles having different heights.what i found is, it is same lines with zick & Moss hand book.

I am looking for relevant data for inclined vessels,if 2 saddles are of different heights are used then induced stresses will be different.

pl reply

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Anonymous Poster
#6
In reply to #5

Re: deisgn of inclined equipments

08/09/2008 12:25 AM

Fair enough,

However, that is quite the specific application and I don't think you are going to easily find literature on it.

What I suggest you do is design the saddles as per horizontal and then "transpose" the moment that will be induced by inclining them.

Does that make sense?

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Anonymous Poster
#7
In reply to #6

Re: deisgn of inclined equipments

08/09/2008 12:44 AM

I hate to advertise another forum, but I would also suggest checking out this site:

http://www.eng-tips.com/threadminder.cfm?pid=292

The guys there seem to be quite knowledge.

I am also going through all my literature to try and came up with a more specific application for you, if I find something I will let you know.

Cheers

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Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#8

Re: deisgn of inclined equipments

08/22/2008 1:43 PM

1- Compute as horizontal with respect to pressure and bending due to own weight

2- Due to the differences an axial load will occur which you should take on the upper saddle to avoid compression of the structure which could lead to local buckling. Consider for saddle dimensions the effects of the axial load mentioned above.

3- Fix axially on only one saddle to allow expansion at higher temperatures

4- Compute stresses due to axial loads and add to the loads under horizontal conditions. verify the sum magnitude considering material behaviour at highest temperature

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