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Reducing The Suction Pressure Of A 2-Stage Reciprocating Compressor

reciprocating compressor hydrogen

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#1 Fairol


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  • 1 posts

Posted 22 August 2017 - 10:55 PM

Dear all,


I have a reciprocating compressor with the process conditions:


  1. 1st stage Suction Pressure : 750kPaG
  2. 1st stage Discharge Pressure: 1600kPaG
  3. 2nd stage Discharge Pressure: 3200kPaG
  4. Fluid type: hydrogen gas
  5. Fluid suction temperature: 10degC
  6. Compressor type: 2 stage compressor
  7. PSV 1st stage: 2.5MPaG
  8. PSV 2nd stage: 3.8MPaG
  9. 1st stage temp: 70degC
  10. 2nd stage temp: 130degC
  11. Estimate Flow capacity: 567Nm3/h

Question: I'm attempting to reduce the suction pressure to 350kPaG. I believe this will cause a reduction in flow capacity if I'm attempting to keep discharge pressure at 3200KPaG. My concern is more to the mechanical parts of the compressor. Will the piston and ryder rings be easily damaged and also if the internal suction and discharge valve of the compressor be proned to being damaged as well? Your help is very much appreciated.

#2 breizh


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Posted 23 August 2017 - 04:41 AM

hi Fairol,

Better to talk to manufacturer .

If you want to perform some calculation you may use the link attached :




my 2 cents,



Edited by breizh, 23 August 2017 - 08:06 AM.

#3 Bobby Strain

Bobby Strain

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Posted 23 August 2017 - 09:59 AM

Use this application from ACI to get detailed information. http://www.aciservicesinc.com/

Then contact your compressor manufacturer.



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