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Low Flow in Pipes- posted in Ankur's blog

Two Phase Flow Correlation For Flare System


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#1 Amin Va

Amin Va

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Posted 03 September 2015 - 04:07 PM

Hi Folks,

 

I would like to know which two phase (liquid-vapour) correlation are you using for modeling flare system hydraulics (which has high velocity and pressure drop)?

 

Thanks,

 

Amin 



#2 Bobby Strain

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Posted 03 September 2015 - 10:48 PM

I have used Duckler constant slip model for 30 years without problems for all applications. I don't think anyone has found a good solution to estimating critical flow in the two-phase regime. I once had a major E&C contractor replace a bunch of piping because he used the equation for gases to determine critical flow. This was in a facility operating for 20 years, without incident. So, maybe you can do some research and let us know what you find.

 

Bobby



#3 serra

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Posted 04 September 2015 - 02:58 AM

In general (velocity < critical flow) the method proposed by Bobby is reliable (when properly applied) and not complex.

To estimate critical flow for two phases you may adopt a variant of HEM model,
the topic has been discussed in this forum, see for example the thread

"http://www.cheresour...g-omega-method"

similar procedures may be applied for piping, for a recent paper
 
"http://www.iaeng.org..._pp733-738.pdf"

 

some software (I have Prode but I think Diers and others have similar procedures) include specific methods, the same for the specialized software for flares (note that in some cases these may apply simplified methods)
 


Edited by serra, 04 September 2015 - 03:07 AM.





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