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Fire - Two Phase Relief From Atm Storage Tank


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#1 J_Leo

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Posted 03 September 2017 - 01:10 PM

Dear All,

 

Has anybody ever considered two phase fire relief from large atmospheric storage tank? On a project, it is assumed 90% liquid full in storage tanks for fire case.

 

From an internal document I have, it says if the tank is padded on the bottom and its diameter is greater than 15 ft, then when the liquid (not bubbly-foamy type) level is less than 95%, then two phase relief can be ignored.

 

Personally, I don't have experience with two phase relief from an atmospheric storage tank. Anybody can give some advice on this?

 

Thank you.

 

Regards,

Leo



#2 AlertO

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Posted 05 September 2017 - 01:38 AM

Hi Leo

 

Two-phase relief is hardly presented in atm storage tank because only vapor can flow to the top of the tank. This is similar when you boils water in a pot.

 

 



#3 fallah

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Posted 05 September 2017 - 02:39 AM

 

Has anybody ever considered two phase fire relief from large atmospheric storage tank? On a project, it is assumed 90% liquid full in storage tanks for fire case.

 

From an internal document I have, it says if the tank is padded on the bottom and its diameter is greater than 15 ft, then when the liquid (not bubbly-foamy type) level is less than 95%, then two phase relief can be ignored.

 

Personally, I don't have experience with two phase relief from an atmospheric storage tank. Anybody can give some advice on this?

 

 

Leo,

 

Because there is no situation based on which an atmospheric storage tank could be liquid filled especially in fire case; then two phase relief isn't applicable to such tanks...
 



#4 Pan Nainggolan

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Posted 14 September 2017 - 03:42 AM

Leo,

 

When fire happens thing that over-pressurized your storage tank is vaporized liquid inside the tank hence two phase relief for fire case give no sense for liquid storage tank



#5 latexman

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Posted 14 September 2017 - 08:16 AM

If the company document applies to your specific tank project, I'd follow it and move on to a real problem.



#6 J_Leo

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Posted 17 September 2017 - 01:43 PM

Dear all,

 

Thank you so much for your responses. I also read a practice from one EPC company, which says if the liquid level is below 95%, then no two phase relief is required.

 

-Leo






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