Dear Farhad,

Thank you for your information and advice.
Is it possible / okay for me to assume that the required frequency for reciprocating compressor is more critical or higher than centrifugal compressor's frequency? Based on my experience in the site, reciprocating compressor has higher vibration than centrifugal compressor. Please correct me if I am wrong about my assumption. Thank you.

I was just doing the assumption since the line I am analyzing now is not actualy main line of the compressor (Suc/Discharge)and it is actualy a spray nozzle on the casing of compressor(0.5" size). Thank you in advance.