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Anti-Surge Valve For Compressors

anti_surge compressors exploitation process engineering

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#1 Sarah_Process_engineer

Sarah_Process_engineer

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Posted 02 December 2016 - 01:35 AM

    - We have two compressors of 6Millions of capacity each one. The Nominal value is 11 Millions Standard cubic meters of natural gas for the plant to run, so the flow is divided into two : 5.5 MMSCM for each machine ( in the normal situation).

   

    - Now, we're running with 8-9 Millions, and the anti-surge of the tubine on mode suction is open all the time (6-9 % open) , So, in order to close the anti-surge valvle of this machine, I opened the valve that can recycle the outlet-gas to enter again the plant, so that the anti-surge valve can close. Because I think it's good for the stability of the machine.

 

So what do you think? is it okey for the anti-surge valve to keep open all the time? or what I did was better ?

 

Thank you!



#2 ADITYA.DUBEY

ADITYA.DUBEY

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Posted 02 December 2016 - 06:10 PM   Best Answer

Hi

 

I think what you did serves same purpose as anti-surge valve functioning,BUT it is less better when you consider compressor stability.

In this case you actually are taking more time to get compressor stabilized in case of surge.

ASV are installed just in the compressor package and thus provides quick stability by opening and providing flow in case of surge..

 

Again I would say what you did is better when you are experiencing Compressor discharge temp is going higher in case of ASV opening.When you recycle through longer cycle(from plant outlet to plant inlet),you are actually giving gas more time to get cooled off and thus your suction temp is not increasing and you have compressor discharge temp in control.

 

Therefore You did better only if you are sure that plant inlet flow is constant and not going to decrease/change sudden and your plat outlet gas temp is at much lower temp than the compressor discharge temp.

 

Hope i made my point clear.

 

Thanks and Regards

Aditya






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