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Diesel Hydrotreating Unit Throughout Reduction

dht unit plant thoughout pressure drop checking hindrance in line

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#26 PingPong


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Posted 20 July 2019 - 05:25 AM

Thanks for the update, but it is a pity that everybody lost so much time on this subject because you first stated that the exchanger had been  cleaned.


Still the question remains how it is possible that an exchanger in gasoil service fouls so much that it can create a pressure drop of 16 bars.


Does the gasoil feed to the unit contain a lot of visbreaker gasoil, and/or delayed coker gasoil, and/or thermal cracker gasoil, and/or LCO from FCCU ?

If so you may need to put nitrogen blanketing on the gasoil storage tanks from which this unit is fed.

#27 Bobby Strain

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Posted 20 July 2019 - 10:05 AM

This should serve as a learning experience.



#28 Muhammad farhan

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Posted 26 October 2019 - 02:50 PM

Hello Every one


thanks for your reply.


I need all of our expert to guide me for following two points 


The Exchanger again choked and pressure has increased, feed is getting reduce day by day. We have opportunity to shutdown unit for some other job at unit but time is very short we cannot hand over this exchanger for cleaning. My question is can we done steaming of exchanger to clean this exchanger. Does steam can clean the exchanger,


We have one line that directly goes to V03 feed vessel but it is does not passed through feed coalescer. So the probabilty is that moisture can pass to catalyst. My question is can does moisture is harmful for hydro processing catalyst. As hydroprocessing catalyst already water as product. 


Please comment we are going to shutdown unit after 24 hours from now. 

Edited by Muhammad farhan, 26 October 2019 - 02:51 PM.

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