LDPE High Pressure Compressor

Pulsation measurements through strain gages

New support and orifice position

ApplicationLow Density Polyethylene Plant
Compressor TypeReciprocating compressor – 2 stg.
ServiceLDPE process secondary compressor
Power7400 kW
Disch. Pressure2500 bar


High vibration upon initial start-up

  • Vibration above SWRI danger curve in some points
  • Acoustic analysis verified through strain gage measurements
  • Both acoustic and mechanical resonances discovered


  • Inserted restriction orifices into key points
  • Modified supporting structure to shift MNF
  • Fabric pads inserted between clamps and pipes


  • Vibration reduced below SWRI danger value