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Heat Exchanger Psv For Blocked Shell Side Flow


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#1 aider94

aider94

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Posted 14 June 2018 - 04:52 AM

I have a question about heat exchanger shell and tube PSV device considering blocked outlet case.

The question is more of fluid dynamics than of PSV. Consider that shell design pressure is as high as a source of pressure and on the shell outlet, we have a valve. If we have normal flow and a valve is closed during normal operation, will the pressure rise and rise and exceed design pressure? 

If does I assume that I need PSV designed for all source stream flow.

Sorry for a newbie question.

Regards,
Jakub
 



#2 latexman

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Posted 14 June 2018 - 06:33 AM

It depends on what is moving the fluid.  A centrifugal pump?  Maybe, it depends on the dead head pressure.  Is that higher than the shell design pressure?  A positive displacement pump?  Yes.  A fixed pressure reservoir?  Maybe.  Is reservoir pressure higher than shell design pressure.



#3 Art Montemayor

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Posted 14 June 2018 - 08:06 AM

In addition to Latexman's comments, I would add the question: is the shell fluid being heated by a tubeside fluid?  if so, can the shell side be subjected to vaporization and high vapor pressures? 

 

The data given is much too general to make detailed, accurate comments.  The problem with studying the safety risks and over pressure possibilities is that not enough thought has been given by the O.P. as to the possible hazards related to the operation.   More thinking and studying of the unit operation is required.  By doing in-depth study of the operation, positive learnings are obtained.  Our Forum comments are meant to stimulate your thinking in that direction.



#4 aider94

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Posted 15 June 2018 - 01:38 AM

Heat exchanger details - it`s inert gas chiller
shell side design parameters: 24 barg, (-45)/120 degC - cooling gas

tube side design parameters: 3,5 barg, (-25)/120 degC - inert gas

There are valves on inlet and outlets on both sides of HX.






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