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Unwetted Vessel High Temperature Relief Case


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#1 Beergson

Beergson

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Posted 24 January 2017 - 12:48 PM

Dear All,

 

During a job we've faced a problem with sizing relief valve for unwetted gas vessel containing ethylene - nitrogen mixture @ 1barG, 34 degC (554R). 

 

The relief valve is set @ 11 barG and thus of this the relief temperature according API 521 guidelines, calculated as T1=p1*Tn/pn is quite above 1400 degC (3128 R).

 

The relief area cannot be calculated acc to API 521 due to the fact that Excel cannot calculate the value of (1559-3128)^1,25, where 1559 is max wesell temp for steel.

 

Do You have any idea how to calculate such a case?

 

Any help will be appreciated.


Edited by Beergson, 24 January 2017 - 02:50 PM.


#2 fallah

fallah

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Posted 24 January 2017 - 01:52 PM

Beergson,

For such a case you can consider the delta T equal to a very little value, say 0.01




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