OFF-SHORE GAS LIFT COMPRESSOR – MINOR BRANCHES FAILURE

Examples of inadequate supports for piping and instruments

Location Mediterranean Sea
ApplicationFloating production storage and offloading (FPSO)
Compressor TypeReciprocating Compressor – 3 stg.
ServiceGas lift compressor
Power1050 kW
Disch. Pressure120 bara

Challenge

Sudden welding ruptures on minor branches

  • High vibrations since the first start-up
  • Skid design failed to consider alternating forces
  • Poor support design

Solution

An acoustical study revealed the need for:

  • Restriction orifices
  • New support installation

Result

Vibrations reduced below the SWRI danger value. No failures occurred after modifications.