×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Limits for tall columns H/L Ratios and Overall

Limits for tall columns H/L Ratios and Overall

Limits for tall columns H/L Ratios and Overall

(OP)
I'm looking for some overall reference for guideance for when it is economic to split a column into two or when you just make the design MUCH taller..

For example when you have a 1.8 meter 60 meter tall and want many more stages:
> is it still economic to go for 80 meters by 1.8 tall ?
> at that stage do you go for two 40 meter tall columns ?

> Or say for 100 meter tall columns etc..?

I guess it is always more cost effective to go with a single trayed column..but what really sets the boundaries..? civil foundations bending moments.. safe wind loads..as by the time you have purchased two columns, spare pumps etc.. the cost for two columns is much more.

I guess like a pen so to speak that you have limits which are unsafe to design..? it seems to make pratical sence for this.. I've yet to see a reference or guidelines I've only completed designs after the decisions were made about no of columns etc..

Comments appreciated..

RE: Limits for tall columns H/L Ratios and Overall

I believe that you should perform a detailed study in order to make this determination.

Get the installation priced both ways, consider maintenance, job site specifics, delivery time etc and then make a judgement.

A column that is 80 meters tall put this in a special class.

http://www.eng-tips.com/viewthread.cfm?qid=253448

RE: Limits for tall columns H/L Ratios and Overall

Usually the major determinants are the properties of the inlet stream and, MORE IMPORTANTLY, the desired specifications of the product. Can you achieve the desired product spec with one tower? Also, you have to consider the pressure drop across the tower. A bigger tower means a higher pressure drop, a thicker and more expensive column (manufacturing and operating).

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!


Resources