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Air Cfm Needed For Tank Agitation Estimation


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#1 curious_cat

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Posted 27 September 2016 - 08:14 AM

I am trying to estimate the scfm of air needed for mild to moderate agitation in a approx. 10 m3 cylindrical tank filled with water. (approx 2 m dia)

 

What are good correlations? My estimate was 0.5 scfm would suffice for this tank. 

 

The correlations I am finding seem very conflicted almost a factor of 100 off.

 

Perry's Handbook recommends about 0.01 cfm per ft2 of tank cross section area. Another correlation (see link below) recommends 1 cfm per ft2 of tank area. 

 

e.g. 

 

http://www.technic.c...fs/1601nd_0.pdf

 

NOTE: For moderate to heavy air agitation in tanks up to 36" deep, 1 to 1 1/2 cfm of air is required per square foot of tank surface area

 

http://imgur.com/a/hIpHv


Edited by curious_cat, 27 September 2016 - 08:15 AM.


#2 breizh

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Posted 27 September 2016 - 07:32 PM

Hi ,

I think that it depends on the device you are using to perform the mixing ( sparger , etc ) , some are more efficient . I've attached a document to support .

 

Hope this helps

 

Breizh



#3 curious_cat

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Posted 27 September 2016 - 10:08 PM

Thanks @breizh. 

 

Unfortunately that document only tells you how to size the sparger element *given* a flow in scfm.

 

But I am looking for figuring out the scfm in the first place. Any idea how you would do that? 

 

For a 10 m3 tank for mild agitation of water depending on what correlation / thumb rule I use I get anywhere from 0.5 to 35 scfm as my estimate. That worries me. 



#4 breizh

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Posted 27 September 2016 - 11:59 PM

http://www.wastewate...nt.pdf?sfvrsn=4

 

Take a look at this paper . it depends on application I guess.

 

Breizh



#5 Napo

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Posted 19 October 2016 - 07:48 AM

Curious_Cat,

 

Attached send you information, from:

 

"Mixing in the Chemical Industry" of Z. Sterbacek and P.Tausk, Pergamon Press, translation from Czech, Great Britain, 1965, p. 236.

 

and,

 

"Unit Operations and Equipment of Chemical Engineering" of A. Planovsky and P. Nikolaev, Mir Publushers, translationn for Russian, Moscow, 1990, p. 102.

 

Napo.

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