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PRESS RELEASE – 01.21.21

SIG addressing the industry challenge of Multiphase FIV – Mike Lewis

A close and honest collaboration through a Special Interest Group (SIG) has allowed us to automate, improve and digitise the service offering and technologies we offer at Xodus.
SIG addressing the industry challenge of Multiphase FIV – Mike Lewis

Vibration induced fatigue failure is a significant problem for the energy sector. The UK HSE estimates it’s the cause of more than a fifth (21%) of gas releases in the North Sea basin.

Although the industry has developed guidelines to help operators monitor and mitigate these problems, for example, the Energy Institute’s AVIFF guidelines, there is limited advice on how to address flow induced vibration (FIV) caused by multiphase flow.

In 2013, ourselves and TNO set up a joint industry project (JIP) to investigate this phenomenon in more detail. The JIP carried out extensive testing to investigate the effects of multiphase forcing on a 6” bend with different upstream configurations and different bend radii. In addition, CFD simulations were carried out to validate this approach against the measurements produced by the JIP.

The outputs allowed the JIP to influence some EI guidelines, by:

+ Producing correlations for forcing functions for a wide range of flow regimes
+ Providing a much better understanding of multiphase forcing than had been available before the JIP began
+ Validating simulation methods (CFD) for use in developing forcing functions for complex geometries and operating conditions beyond those tested.

Though the JIP came to an end four years later, it has spurred us, TNO and TechnipFMC to create and continue a Multiphase FIV SIG.

The objective of its members, which has grown from seven to 12 in three years, is to openly share experiences and extend knowledge of a wide range of pipework installations from subsea production systems to onshore and offshore plant.

The first meeting was held at TechnipFMC’s offices in Oslo in May 2017 and so far, there has been six bi-annual face-to-face gatherings covering topics such as:

+ Field and lab measurements and datasets
+ Field experience
+ Screening and prediction methods
+ Vibration measurement techniques
+ Mitigation methods

In early 2020, to align with COVID-19 restrictions, a series of short online meetings were arranged, which are still proving popular. These are focused, one-hour virtual get-togethers, which includes a half hour presentation and a Q&A session. So far, TechnipFMC, TNO, University of Glasgow, and University of Tulsa, have shared some interesting insight, with TUV NEL up next. To avoid IP issues, there is a ‘show but not leave’ policy.

In addition, guest speakers are often invited to take part. Most recent contributors have included Imperial College, Eindhoven University, NTNU, Cranfield University, and University of Newcastle.

This collaborative way of working brings tangible and valuable benefits to our clients.

For instance, in a recent subsea jumper project, the use of more accurate assessments clearly demonstrated there was limited vibration risk. Such a decisive conclusion would have been problematic in the past. The vibration risk was therefore mitigated, allowing the client to make substantial cost savings.

All those interested in joining or finding out more about the SIG should contact Mike Lewis (mike.lewis@xodusgroup.com). More information can also be found on the dedicated website https://mfivsig.com/.

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SIG addressing the industry challenge of Multiphase FIV – Mike Lewis
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