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Flow Induced Pulsations (FLIP) in Rough Bore Gas Flexible Pipes, Tests and Model

[+] Author Affiliations
S. Legeay, M. Decuupere, D. Charliac

TechnipFMC, Le Trait, France

Paper No. OMAE2017-61324, pp. V05AT04A012; 7 pages
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5A: Pipelines, Risers, and Subsea Systems
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5769-4
  • Copyright © 2017 by ASME


Since the early 2000’s singing risers phenomenon has been encountered. The so called Flow Induced Pulsations (FLIP) phenomenon occurs in dry gas risers (such as Gas Export lines) and may generate high tonal noises up to 110 dB but may also lead to high vibration of adjacent equipment leading to significant fatigue failure.

This publication presents the recently developed model that aims at performing FLIP assessment for rough bore gas flexible pipes. The developed model provides the FLIP onset velocity and frequency for a given rough bore. It will also describe the main contributing factors such as the inner layer corrugation profile, the operating conditions (pressure, temperature and flow rate) and adjacent equipment’s acoustic reflection contributions.

In addition, a Flow Induced Pulsation test carried out in 2003 to 2006 will be presented. Test outcomes will be compared to model presented in the first part.

Finally, reliability of the model will be presented detailing benchmark with past tests and FLIP experienced on fields.

To conclude, the model enables predictions and recommendations to avoid FLIP at an early stage prior to project execution.

Copyright © 2017 by ASME



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