Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

0

Intepretation Of Api Std 521 - Gas Velocity In Flare Kod

gas velocity droplet size flare kod burning rain kod sizing api 521

3 replies to this topic
Share this topic:
| More

#1 Mathi

Mathi

    Veteran Member

  • Members
  • 32 posts

Posted 26 December 2017 - 12:32 PM

I am a little bit confused on the below paragraph of API STD 521. Please pinch in your opinions on this regard. 
 
"Liquid droplets 300 μm and larger may drop out of the gas stream at less than 2 m/s. If liquids are not drained from the system, flare flows with gas velocities exceeding about 3 m/s or 4 m/s can entrain liquid droplets up to 1000 μm in size. Liquid droplets exceeding 1000 μm can readily lead to burning rain regardless of flare type. Burning rain can occur at smaller droplet sizes for some flare types."
 
My queries are the following.
 
In KOD sizing, should the gas velocity in the KOD be kept at less than 2 m/s to enable liquid droplets larger than 300 microns to separate despite having gas residence time greater than liquid droplet fall time?
 
Are there any other reference articles or studies supporting the above statement of API STD 521?


#2 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,699 posts

Posted 26 December 2017 - 02:25 PM

API 521 has never been a good guide. You can visit my website, just Google my name, and use the sample horizontal separator program you can access from the link on the home page.

 

Bobby



#3 Mathi

Mathi

    Veteran Member

  • Members
  • 32 posts

Posted 28 December 2017 - 12:29 PM

Bobby

 

Thank you. Your online calculations was useful. However, I am unable to adjust the liquid droplet size. Can you please explain the logic behind "Max Vapor K recommended" and "Max. Vapor X flow velocity Recommended"? 

 

It is my understanding that "Max vapor k recommended" is based on souder brown equation. I am have no idea regarding max. vapor x flow recommended. It will be helpful if you can elaborate.



#4 Bobby Strain

Bobby Strain

    Gold Member

  • Members
  • 2,699 posts

Posted 28 December 2017 - 02:09 PM

You must select the flare KO drum where you see the Process Separator displayed. You can change the droplet size. The maximum values are used in the sizing routine. These limits will always give you a separator/KO drum that is not too small. This is the stuff that the API procedure doesn't address explicitly.

 

Bobby


Edited by Bobby Strain, 28 December 2017 - 03:47 PM.





Similar Topics