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Margin In Stonewall Flow In Centrifugal Compressor

compressor stonewall margin

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#1 CSNK

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Posted 24 August 2018 - 01:25 AM

Hi all,

 

 

If centrifugal compressor is running at a load somewhat less by 2% than stonewall flow. Will there be any concern, if yes what?

What should be flow margin from stonewall that a centrifugal compressor should be allowed to run?

 

Thanks in advance.

 



#2 Technical Bard

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Posted 30 August 2018 - 11:03 PM

The challenge is that the stonewall LINE that is drawn on a compressor map isn't precise - it's a prediction.  I have seen someone run a centrifugal compressor to within 2% of the stonewall line without problem.  I have also seen someone stonewall a compressor before reaching the line on the map...  



#3 PingPong

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Posted 31 August 2018 - 01:12 PM

Stonewall occurs when the gas in the compressor reaches its sonic velocity (speed of sound).

 

The speed of sound in a gas depends on its actual specific heat ratio, its actual absolute temperature, its actual molecular weight and its actual compressibility factor.

 

The stonewall line on a compressor graph is therefor often not accurate for the actual operating conditions of the compressor.






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