Mounting on properly designed neoprene rubber mount will reduce the sound from compressors.Custom built Electronic noise reduction equipment s are available.Else mounting can be made inside un- echoic enclosure(Canopy) will serve the purpose.
Indeed, properly chosen mountings, neoprene or steel springs, depending on the frequencies of the compressor. In many cases a concrete inertia block is advisable. And don't forget the connected pipes!
The key parameter to eliminate reciprocating compressor vibration is the well-designed pulsation suppression device (two surge bottles with one choke combination), please review API 618, also Appendix-M to fellow one of the three design approaches. Pulsating vibration remedy can be performed by a complete acoustic and stress analysis study.
However for new installation
If available, review with the vendor rotor dynamic stability report.
This report includes ( lateral or torsional vibration with critical speeds from 0 to trip)
If available, review all stress analysis including piping system supports as well as the agreed mounting base frame. In addition, the design of surge bottles.
Old installation
Define the source of vibration (spectrum analysis report) to solve for the problem, if it is the compressor itself or emerging from the deriver) and which mechanical part to maintain.
Review the piston run out reading as API 618.
If the exciting force is due to the resonance, review all piping supports flexibility and base foundation cracks or movement. Also review if any mechanical retrofitting had been done in the manner to affect the system stiffness or mass.
Review if any operating parameter had been changed (pressure, temperature, and gas composition).
For resonating piping system, re-correction is necessary for resonated piping length by modified piping supports.
Acoustic and stress analysis can be performed by any commercial software as AUTOPIPE or CAESAR
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