Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Rectangular Tank Design

Rectangular Tank Design

Rectangular Tank Design

I'm needing to design a rectangular tank under hydrostatic pressure. I've been looking at procedures in "Design of Weldments" by Blogett, "PV Handbook", and a procedure I downloaded. The dimensions of my tank are 72"Hx72"Wx243"L made from A36 Carbon Steel.

Every procedure starts out by calculating the a/b ratio for a flat plate with 3 edges supported and 1 edge free (Roark Case 2d). In my case, a/b would be 72/243 = 0.296. Roarks Case 2d starts at an a/b ratio of 0.5, so my case is off the table. So how do I handle that? Do I cut the length in haf assuming there is a vertical stiffener there? Need some advise.

Thank you.

RE: Rectangular Tank Design

It's been a long time since I designed a rectangular tank, but I remember that I used stiffeners to get plate stresses to acceptable limits. I used Roark's for my calculations.

RE: Rectangular Tank Design

Check the PV handbook which has the table of the a/b ratio (i.e. H/L ratio) from 0.25 to 4.

RE: Rectangular Tank Design

Yes, yes.... many stiffeners are required. There have been many discussions on this forum about the design of rectangular tanks.

Don't expect the tank to be cheap ..... By the fundamental nature of the design, they will be expensive and difficult to fabricate, inspect and coat.

Stiffeners (typically angles) will be required at all corners and at spans of about 3-4 feet along the sides. Many stiffeners means much welding and corrosion issues ....

The bottom will need to be continuously supported ....

What will the tank be used for ? Will it have an open top ? .... If so, you will need a top stiffening angle ....

Share with us your final solution

Sr. Process Engineer

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close