LDPE Compressor

High Piping Vibrations
Vibrations reduced below swri danger value
Country:
Taiwan
Application:
Low Density Polyethylene Plant
Compressor type:
Reciprocating compressor – 2 stage
Service
LDPE process secondary compressor
Power:
7400 kW
Pressure:
2500 bar
LDPE Compressor
Problem

High vibrations since first start-up

  • vibrations above SWRI danger curve in some points
  • acoustic analysis verified through strain gage measurements
  • both acoustic and mechanical resonances found
Solution
  • inserted restriction orifices in key points
  • modified supporting structure to shift MNF
  • inserted fabric pads between clamps and pipes