Rectangular Tank Design 1

[1ton]

Hi all
I would like to know if there is a standard for Rectangular Tank Design under Hydrostatic Pressure ?

I am using Eugene F. M Pressure Vessel Hand book, this tank design. I think it is a bit conservative. Any other method of calculating, would be appreciated.
Tank dimension L=4m , W=2.5m H=2.5m
Using Horizontal Stiffenings pg 212, I got plate thickness for 14mm.

Thanks

 

[quark]

Check this thread794-27937

Gordon has a very good paper.

 

[Raydel]

Hello Quark (what a great name!)

Yes, there is a procedure. I you are willing to work your way through the ASME VIII Division 1 BPV code, in Appendix 13, you will find the complete procedure for a number of different configurations. The arithmetic is somewhat lengthy, but if you are patient, you will be able to develop the design.

If you know someone who has a copy of the COADE CodeCalc software, they will be able to do the calculation for you in a matter if minutes.

If you need any further information, you can contact me at raydel@sbcglobal.net.

 

[quark]

Ty Ray. Actually I want to be a charmed quark always but soemtimes you cannot resist being strange.

By the way the procedure you mentioned details the design, by beam deflection method or anything else? I have a paper with me sent by Gordon (with reference to the thread I mentioned) written by Kanti Mahajan and it seems to be fairly ok.

Regards,

 

[MJCronin]

1ton,

The only times I have had to design/evaluate a metallic "rectangular tank" is when I had a boss that didn't understand how expensive they can be.....I have specified/designed several that were scratched......cheapest always wins out

Again, unless you are retricted in available space and a tank MUST be placed in that space...... a cylindrical API-650 style, flat-bottomed tank is always cheapest....

my thoughts only...

MJC

MJC

 

[1ton]

Thanks MJC, Quark , Raydel for your input. I got the paper from Kanti K. for Gordan.

MJC, you are right rect. tank is indeed expensive, but unfortunately we need to fitted it into a corner of a building and space is restricted.

But just to let you know what I found out from my local fabricators, that they have built a tank for 6mm thick plate (no calculation justification), where else with all our stress calculation we came out to 14mm. Bearing in mind it is just a water tank, does anyone has any thoughts or any comments on this..... ( safety / practical ??)
Thanks

 

[DSB123]

1ton,
I beleive the Megyesy book is based on flat plate theory whereby the deflection could dominate (i.e. must be less than 0.5 x thickness) and therefore require such a thickness. On the other hand if you ignore the deflection and look at membrane theory to perform the design the plate thickness could be reduced and it does not surprise me that the fabricator used 6mm plate.

 

[abbver98]

I don't know if you heard about Marbec method called Nodal Circle Method. It's applicable for such construction.

 

[Raydel]

Iton

IF the tank is an open top tank (you did not mention the specific design), and is to hold water, then Appendix 13 will not help you. An entirely different approach is required. If this is the case, then as someone above mentioned, the book by Megyesy will help you, but I have a simple programme that might help you. This programme only considers liquid carrying tanks either with or without a permanent cover, and allows the used to figure out the bracing that must be installed on the sides.

 

[Tankman650]

DSB123 is correct. You can reduce the thickness of your flat plate if you consider large deflections in your analysis. There are some trade offs.

See:

TUBULAR STEEL STRUCTURES, TROITSKY, 1982
7.5.5.2 LARGE DEFLECTION THEORY

DESIGN OF STEEL BINS FOR STORAGE OF BULK SOLIDS, GAYLORD & GAYLORD,
6-19 LATERALLY LOADED PLATES - LARGE DEFLECTION THEORY

I have designed several rectangular bins using Gaylords book and significantly reduced the plate thickness. Field tests show the deflections are close to their results.

Troitsky's book is available from lincoln welding web site for about $25. You can find Gaylord through Amazon or get a coy from the library.

 

[1ton]

Hi guys
Thanks for the input.

abbver98, I don't have much idea about Marbec method - Nodal Circle Method would appreciate if you could point me in the right direction, (books or pdf files, etc). thanks again.

Raydel, I would appreciate if I can have the program.

Tankman650, Thanks for the info. I will try and get the book and have a go at it.

Thanks guys...

 

[umbertob]

hi all,
please can someone send me a copy of work of Kanti K Mahajan about rectangular tank design?

I think it will be very helpful to me
use thisemail: pakistano@aliceposta.it

thank in advance
bye

Umberto