Can i know what is a turndown ratio for a distillation column?
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Turndown Ratio
Started by conan_kaya, Jul 27 2009 07:11 AM
6 replies to this topic
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#1
Posted 27 July 2009 - 07:11 AM
#2
Posted 27 July 2009 - 07:23 AM
QUOTE (conan_kaya @ Jul 27 2009, 07:11 AM) <{POST_SNAPBACK}>
Can i know what is a turndown ratio for a distillation column?
Minimum controllable feed flowrate / Maximum controllable feed flowrate
#3
Posted 28 July 2009 - 10:01 AM
QUOTE (conan_kaya @ Jul 27 2009, 05:41 PM) <{POST_SNAPBACK}>
Can i know what is a turndown ratio for a distillation column?
Dear,
For any system the turn-down ratio is called as ratio of minimum flow to maximum flow which it can handle.
#4
Posted 28 July 2009 - 11:18 AM
The turndown ratio I'm familiar with is always > 1, so it's maximum controllable feed flowrate / minimum controllable feed flowrate. The keyword is controllable.
#5
Posted 29 July 2009 - 12:09 PM
QUOTE (latexman @ Jul 28 2009, 09:48 PM) <{POST_SNAPBACK}>
The turndown ratio I'm familiar with is always > 1, so it's maximum controllable feed flowrate / minimum controllable feed flowrate. The keyword is controllable.
I hope the word Turn-Down itself is evident to say its value is less than 1. Normal terminology in design is
Normal Flow = 100%
Degin Flow = 100% + Degin Margin e.g. 10% = 110%
Turn-down = e.g. 60%.
I hope it will be helpful.
#6
Posted 29 July 2009 - 12:27 PM
QUOTE (Padmakar S Katre @ Jul 29 2009, 12:09 PM) <{POST_SNAPBACK}>
I hope the word Turn-Down itself is evident to say its value is less than 1.
Sorry, but logic and the English language sometimes do not coincide. Maybe, it's a regional thing, so all I can speak to is the common practice in the U.S. chemical industry where the turndown ratio is > 1. Specifically, it would be written as, for example, 10:1, and spoken as "10 to 1". Take a look here:
http://en.wikipedia..../Turndown_ratio
Hope this helps.
#7
Posted 29 July 2009 - 01:02 PM
QUOTE
Sorry, but logic and the English language sometimes do not coincide. Maybe, it's a regional thing, so all I can speak to is the common practice in the U.S. chemical industry where the turndown ratio is > 1. Specifically, it would be written as, for example, 10:1, and spoken as "10 to 1". Take a look here:
http://en.wikipedia..../Turndown_ratio
Hope this helps.
http://en.wikipedia..../Turndown_ratio
Hope this helps.
Dear Latexman,
Thanks for this and yes thats true. I checked it on my side its always more than or minimum equals 1. Sorry I hope you don't mind for my argument. Have a nice time.
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