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Reboiler Tube Rupture And Normal Condensing Duty


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#1 solnoid

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Posted 11 July 2017 - 09:17 AM

Hello,

 

I'm looking at the relief valves on several distillation columns and in particular, the case of a reboiler tube rupture. I'm wondering if it is acceptable to take credit for the normal condensing duty of the overheads condenser during a tube rupture failure. It is my belief that losing cooling water to the overheads condenser and having a reboiler tube rupture would be considered double jeopardy.

 

Are there any precedents or code implications that would prevent me from doing so? I have not encountered any yet in my research. Thanks.



#2 Pilesar

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Posted 11 July 2017 - 10:10 AM

Assuming normal condensing UA is reasonable for reboiler tube rupture case. You should not take credit for condenser U higher than U(service). Condensing duty can be recalculated for conditions at the relieving pressure so this likely results in a higher condensing duty credit than 'normal.' 



#3 Pilesar

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Posted 13 July 2017 - 03:12 PM

Thinking more about my answer, it may not be conservative enough. If you have a turndown case for your overhead condenser, you should use that to constrain your condenser duty credit. You may have a reboiler tube rupture when you are operating the condenser turned down.


#4 spchauhan12

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Posted 28 July 2017 - 01:53 AM

Dear  solnoid,

 

 

Kindly have a look into API 521 section : Individual Overpressure Causes and Their Relieving Rates.

 

Regards,

 

SPC






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