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Fouling Liquid In Tube Side - U Type

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#1 saeed.s


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Posted 24 June 2021 - 06:29 AM

Hi everyone


Do you have any experience in design or operation U type-heat exchanger with fouling fluid ( like: vacuum bottom) in tube side ? I am dealing with a project, that owner prefer to use U type insted of floating type heat exchanger. but I am worry about cleaning & maintenance.


Thanks in advance

#2 latexman


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Posted 24 June 2021 - 08:38 AM

Tube ID?  Shell diameter and length?

#3 saeed.s


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Posted 24 June 2021 - 09:01 AM

Tube ID :   We can choose : 1- Tube OD: 19.05 mm ,  Thk : 2.1 mm  

                                            2- Tube OD: 25.4  mm ,   Thk : 2.1 mm 


Shell diameter :  24" pipe  Sch40 , OD: 610 mm , ID: 590.94


length:  We can choose : 2 HE With  3 meter long   OR   1 HE With 6 meter long 

Edited by saeed.s, 24 June 2021 - 09:02 AM.

#4 Bobby Strain

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Posted 24 June 2021 - 09:53 AM

You need to be sure that is really the owner speaking. If it is, give him what he asks, along with a disclaimer. Many times, the owners employee does not speak for the owner. You didn't mention the shellside fluid. A fixed tubesheet design may present an alternative.



Edited by Bobby Strain, 24 June 2021 - 09:56 AM.

#5 latexman


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Posted 24 June 2021 - 10:30 AM

The u-bends can be chemically cleaned.  They can also be mechanically cleaned, with special tools.  IIRC, 3/4" is not too small, but the 1" may make it easier.  I'd run the options by the plant's high pressure water wash vendor in an e-mail with the details given above.  Their reply is your documentation for your disclaimer.


Why does the owner want a u-tube?  High tube pressure?  U-tubes cost about 10% more than fixed tube sheet.

#6 saeed.s


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Posted 25 June 2021 - 02:33 AM

Thank you all


I attached TEMA sheet for u type & floating type. 


1- A fixed tube sheet design may present an alternative:  Because of high temperature difference ( also in start up or shut down situation ) & need for cleaning, removable bundle type should be used.


2- Why does the owner want a u-tube?lower cost compare to floating type & shorter time to fabricate.


3- In U type, vacuum bottom  placed in tube  because of lower fouling possibility compare to shell side fluid ( bitumen )


4- In Floating type, Due to the possibility of  cleaning  tube with water jet, more  fouling fluid ( bitumen) placed in tube. 


5- To reach same temperature in two type of heat exchanger, size of floating type ( 26" ) is greater than U type (24") . ( because of lower tube count in floating type)


6- In the link below, I found some case studies


https://www.wjta.org...be Cleaning.pdf



Attached Files

Edited by saeed.s, 25 June 2021 - 02:33 AM.

#7 breizh


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Posted 25 June 2021 - 03:29 AM


You may consider this document with  pros and cons.

Hope this is going to help you .


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