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Rating Of An Existing Heat Exchanger

rating heat exchanger new process data

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#1 process85

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Posted 23 September 2016 - 06:28 AM

Hello All,

 

I have a query regarding rating of existing exchanger.

I have an existing exchanger for which geometry is available, however, I do not have the process data for that exchanger.

I have a new process service and I need to check if the above mentioned existing exchanger can be used for the same. For the new process service, I have the process data, U value, etc.

 

Do I really need the process data for which the existing exchanger was originally designed or the exchanger area calculated from the geometry available with me should suffice the requirement.

 

My understanding is to calculate the required area for the new service & if it is lower than the area of the existing exchanger, then it should suffice my requirement.

 

Needless to mention, I will check the suitability of the existing exchanger for the new process service for following:

1. TEMA type

2. Material of Construction

3. Pressure drop etc.

 

 

Can someone please confirm the above understanding.

 

 

Thanks

 

 

 



#2 srfish

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Posted 23 September 2016 - 09:45 AM

You are right. You do not need the process data for which the heat exchanger was originally designed for.

 

Do you have the baffle cut? So many times it is missing from the mechanical data.



#3 Dipankarc84

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Posted 25 September 2016 - 02:44 AM

Hi,

 

Ideally you would not need the original process data sheet. However, may I ask what tool you are using for rating? Typically it is recommended to set up the base file for the rating (in case you are using HTRI or HTFS) using original design values. This way it is easier to pick out if there are any gross miscalculations in your base file or the original design case itself. It is also easier to compare the rhov2, vibration data etc. using the design case and current operating values (in case you have them). Hope this helps......



#4 process85

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Posted 27 September 2016 - 03:44 AM

Thanks Dipankar & Srfish for your replies.

 

Srfish

The baffle cut data is available with me. Thanks

 

Dipankar

I will be doing the rating in HTRI. However, as mentioned above, I don`t have the original process data for which the existing exchanger was designed for. Hence, I will have to input the new process data & existing exchanger geometry in HTRI rating mode.

I will check the vibration, rhoV2 for the new service and if all are within allowable limits, I should be able to confirm that the existing exchanger is suitable for new process service.

Kindly inform if I am missing on anything.

 

Thanks & Regards,



#5 Dipankarc84

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Posted 28 September 2016 - 07:22 AM

Hi,

 

Yes indeed, as mentioned, having the original PDS would have been "ideal" as a cross verification step that your HTRI file is correctly configured. If you do not have it, it is not a show stopper. Just need to be careful in checking the compatibility of the new process fluids with the existing Materials of Construction. You may want to check with a Materials specialist to confirm the same.

 

Cheers

Dipankar






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