Seabed Proximity Effect on Free Spanning Pipelines: the FIST JIP

Caruso, M. and Sutherland, J. (2023) Seabed Proximity Effect on Free Spanning Pipelines: the FIST JIP. In: ASME 2023, 11-16 June 2023, Melbourne, Australia.

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Natural free spans occur in offshore pipelines when its stiffness prevents it from following the contours of the seabed., typically either due to the seabed contour or an erosion process after the pipe is laid. Free spans may be subjected to vortex induced vibrations that can lead to rapid accumulation of fatigue damage. Most offshore pipelines free spans occur in the proximity of the seabed. The influence of the seabed proximity on the hydrodynamic behaviour of the system is dictated by the span gap. When the seabed proximity significantly affects the flow around the pipeline in free span, the span may be considered a small gap span. When assessing VIV in small gap spans, current practice is to either nearly ignore the effect from proximity or to ignore VIV based on a critical gap approach. Previous research on crossflow VIV showed that both approaches are limited. Thus, a joint industry project to study proximity effects in free spans in scour trenches, the FIST JIP, was formed. FIST JIP performed extensive test program focused on in-line VIV near seabed, with and without scoured trenches, to document the proximity effects. This paper presents the experimental work from FIST JIP and a suggestion to incorporate its results to better account for seabed proximity.

Item Type: Conference or Workshop Item (Paper)
Subjects: Maritime > General
Divisions: Maritime
Depositing User: Helen Stevenson
Date Deposited: 28 Sep 2023 09:43
Last Modified: 28 Sep 2023 09:43

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