DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
(OP)
I have been trying to find recognized standards regarding design of large open rectangular storage tanks. My company has acquired this product line recently with no backup calculations. There are many sizes. I would like to check the designs, and also determine what modifications are necessary to handle seismic loading.





RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
Note that the method in Megyesy is limited to small tanks: 30cuft for unstiffened & 140cuft for stiffened tanks.
On several occasions I have used Blodgett to check calc's using Megyesy method, & found the Megyesy method to be unconservative for larger tanks.
The Blodgett book is dirt cheap, as are all of the good reference books available from Lincoln.
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
There is another method called Nodal Circle or Mohr method that consist on searching the equivalent circle of the form and reinforce the portions compressed or stretched. It's very simple method. The thk calc remains the same as it's for regular form. Welding joint have to be arranged far from stressed places.
John, Would you please send me the article? Thank you so much.
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
I supposed it's a new method of flange calculation but it's the commonly used in ASME code Section VIII division 1 Appendix 2. I don't run the calculation because I have the same sheet that I used many years ago. My colleague (senior engineer) has very perfect program that calculate the stress due to external load any origin (wind, seismic, punctual, …) and the shape factor are calculated with high accuracy using appendix formulas so he doesn't get tired to use a graphics.
I'm about to finish an executable program that calculate flange stress with any load, any flange type with some features :
*High interactivity and user-friendliness.
*Material library for flange with mechanical properties (YS, TS, A%, main composition, Sr, St).
*Material library for bolting with mechanical properties(YS, TS, A%, main composition, Sr, St).
*Material library for gasket with mechanical properties (m, y, type).
*Flange type drawing display.
*Technical Report text format, can be printed.
*Calculation according to the new European code EN13445 for Unfired Pressure Vessel Part 3 Chapter 11 that is the same as EN1591 : Flanges and their joints – Design rules for gasketed circular flange connections – Part 1: Calculation method.
*Material library for Standard European steel.
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
Check out "Tubular Steel Structures, Theory & Design"
The James F. Lincoln Arc Welding Foundation
$15.00 US at http://www.jflf.org
Chapter 7 "Bins & Bunkers"
Provides design by large deflection theory
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
I would be interested to know what references you refer to for tank design based on membrane theory. I have not been able to find anything that addresses large deflection analysis of rectangular flat plates subjected to non-uniform pressure. I have seen a table in Roark for large deflection of flat plates with uniform loading, but not hydrostatic type loading.
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
J.A.Martinelli,"Stress Analysis of Pressurized Panels," Machine Design, Dec. 9,1976, pp149-151. This should be available in engineering college libraries, or on the desk corner of your nearest ancient engineer ;)
He has you calculate the stress & deflection by the various methods - if defl>10*t, then it's a "membrane," if defl<0.2*t, it's a "plate," if between these, it's a "thin-plate"
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS
2)"Tubular Steel Structures-Theory & Design" by Triotsky and published by the James F. Lincoln Arc Welding Society.
Deflections are within the elastic range and not in the plastic region with the analysis presented above. No large deflection-
Timoshenko as an analysis for large deflection of beams however this is not what you are looking for.
RE: DESIGN METHODS AND STANDARDS FOR RECTANGULAR STORAGE TANKS