Knocking Sound From Cylinder

Loosened piston and FEM tightening check

LocationItaly
ApplicationLandfill biogas generation
Compressor TypeReciprocating compressor – 2 stg.
ServiceBiogas compression
Power450 kW
Disch. Pressure16 bara

Challenge

Knocking sound from cylinder head

  • Piston-to-rod connection found loosened

Solution

  • Trend analysis to highlight possible overpressure
  • Visual inspection and measurements revealed an “out of tolerance” dimension of rod to piston connection
  • FEM Analysis carried out on mating areas confirmed a tightening fault during assembly

Result

Dimensional checks and new tightening procedure implemented to prevent further problems