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Valve Choked Flow?


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#1 justinbasha

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Posted 10 August 2016 - 02:41 PM

Hi There:

I am in the middle of doing calculations for a fuel gas blanketing system?   I currently have attached a drawing of the system I am looking to model.  However, one question I have is.  I am attempting to tie into an existing two inch gate valve connection to supply the gas.  Would anyone point me in the correct direction of determining the max flow of gas that the valve can deliver?   I know the Cv of the valve, the required flow rate, pressure down and upstream and temp?

 

Thank you.  Your help is greatly appreciated. Attached File  Tank PFD.pdf   115.61KB   20 downloads

 



#2 latexman

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Posted 10 August 2016 - 03:28 PM

I would point you to Crane Technical Paper No. 410.

 

The 2" gate valve will be a small fraction of the total resistance to flow.  Without more details, I would guess that a 2" system (gate valve, pipe and fittings) will be too small for the stated flow rate and pressure.  It will definitely be noisy.



#3 proinwv

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Posted 10 August 2016 - 03:59 PM

You need to know certain parameters for that valve and use the ISA formulas to determine choking. Also, you can probably contact the manufacturer and they will assist you saving you the time.



#4 Art Montemayor

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Posted 10 August 2016 - 08:31 PM

Justin:

 

I corrected your thread's title.  The correct English word is CHOKED - not "chocked".  It is equivalent to the word throttled.

 

You are not the first (nor perhaps the last) to use this misnomer.   What fluid mechanics prof started to use this erroneous term has remained a mystery.






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