Certain subsea infrastructure design features coupled with high flow rates can lead to internal Flow Induced Vibration (FIV) of subsea jumpers.&nbsp; Excessive FIV can result in accumulation of allowable fatigue damage levels prior to the end of jumper service.&nbsp; For this reason, an extensive monitoring program was instated for a large development in the Gulf of Mexico (GOM).The program consisted of both in-situ measurement and analysis. &nbsp;Selected well and flowline jumpers were outfitted with subsea instrumentation for dedicated vibration testing. Finite Element (FE) models were developed for each jumper and refined to match the dynamic properties extracted from the measured data.&nbsp; Fatigue analysis was then carried out using the refined FE model and measured response data. If warranted by the analysis results, action was taken to mitigate the deleterious effects of FIV. Details on modeling and data analysis were published in OMAE2011-49795. Herein, we focus on the overall findings and lessons learned over the duration of the program.&nbsp; The following topics from the program are discussed in detail:a) In-situ testing (flow rate incrementing, vibration measurement, logistics);b) Overall vibration trends with flow rate and lack of correlation of FIV to flow intensity (rho-v-squared);c) Vibration and fatigue of flowline jumpers vs. well jumpers (swept elbows vs. target elbows, subsea and topside chokes, line pressure);d) WI well jumper vs. production well jumper considerations;e) Measurement error due to the subsea logger clamp/insulation SDOF sub-system;f) Fatigue analysis conservatism: loading, S-N curve, well depletion profile vs. continuous worst-case conditions;g) Flow rate limits for FIV.The findings from the FIV management program provide valuable insight for the subsea industry, particularly in the following areas:1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Well/flowline jumper design and operability for FIV;2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Limitations associated with predictive analysis of jumper FIV;3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In-situ instrumentation and vibration measurement;4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vibration mitigation strategies.Future subsea developments will likely include subsea injection and processing. &nbsp;At the same time, a minimal set of standardized subsea equipment will be favored to reduce cost. This leads to a heightened potential for FIV, going forward.&nbsp; If learnings, such as those discussed here, are fed back to design, analysis and monitoring guidelines for subsea equipment, the potential for FIV can be dramatically reduced.

Managing Flow Induced Vibration in Subsea Jumpers

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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