Case Studies: Flow Induced Pulsation (FIP)

BG Lomond Vibration Induced Fatigue (VIF)

Changes in the Erskine Process Module on the Lomond Platform required a complete screening analysis to The Energy Institute Guidance for the Avoidance of Vibration Induced Fatigue Failure in Process Pipework, 2nd Ed 2008. Spectrum undertook analysis of flow induced turbulence (FIT) and flow induced excitation/pulsation. For the latter we use our PIPAC® (PIPework ACoustics) software to establish acoustic resonant lengths in complex pipework arrangements. In addition we looked at Acoustic Induced Vibration AIV/HFAE/Acoustic Fatigue). We recommended a range of modifications to the system.

Gaupe and Seymour Sidetrack Development, BG Armada, UK North Sea

Spectrum were appointed to undertake a High Frequency Acoustic Excitation (Acoustic Fatigue or Acoustic Induced Vibration) Study for the Gaupe Blowdown, the Common Blowdown, and existing Maria Separator Blowdown lines. Recommendations were made for changes to welded attachments and bracings and the addition of reinforcement pads.

ConocoPhillips Judy Platform and Riser Platform, UK North Sea

Spectrum undertook evaluations of risk of Acoustic Induced Vibrations (AIV) and Flow Induced Vibration (FIV) on the existing process platform and new riser platform as part of the Jasmine Field development. We investigated the low and high pressure flare header systems and provided recommendations to AMEC to reduce the risk of fatigue failures arising.

ConocoPhillips Jasmine Wellhead and Accommodation Platforms, UK North Sea

Spectrum were instructed by WorleyParsons to assess the risk of AIV/FIV on these new platforms arising within their flare header systems. The risk came from the operation of blowdown and other valves. We worked throughout to guidance given within the Energy Institute Guidance for the Avoidance of Vibration Induced Fatigue Failure in Process Pipework, 2nd Ed 2008