Dynamic response of multi-span offshore pipelines

Sollund, Håvar A.; Vedeld, Knut; Hellesland, Jostein; Fyrileiv, Olav

doi:10.1016/j.marstruc.2014.07.006

Cited by 23 publications

(6 citation statements)

References 4 publications

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“…The interaction between the soil and the pipeline shoulders are considered by the linear elastic soil springs as suggested by DNV-RP-F105 [33]. The spring stiffness in the lateral ( ), vertical ( ) and axial ( ) directions is given in Table 2 [34]. These parameters correspond to a soil condition of loose sand [34].…”

Section: Subsea Pipe-in-pipe Systemsmentioning

confidence: 99%

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Using pipe-in-pipe systems for subsea pipeline vibration control

Hao

2016

Engineering Structures

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Pipe-in-pipe (PIP) systems are increasingly used in subsea pipeline applications due to their favourable thermal insulation capacity. Pipe-in-pipe systems consist of concentric inner and outer pipes, the inner pipe carries hydrocarbons and the outer pipe provides mechanical protection to withstand the external hydrostatic pressure. The annulus between the inner and outer pipes is either empty or filled with non-structural insulation material. Due to the special structural layout, optimized springs and dashpots can be installed in the annulus and the system can be made as a structure-tuned mass damper (TMD) system, which therefore has the potential to mitigate the pipeline vibrations induced by various sources. This paper proposes using pipe-in-pipe systems for the subsea pipeline vibration control. The simplification of the pipe-in-pipe system as a non-conventional structure-TMD system is firstly presented. The effectiveness of using pipe-in-pipe system to mitigate seismic induced vibration of a subsea pipeline with a free span is investigated through numerical simulations by examining the seismic responses of both the traditional and proposed pipe-in-pipe systems based on the detailed three dimensional (3D) numerical analyses. Two possible design options and the robustness of the proposed system for the pipeline vibration control are discussed. Numerical results show that the proposed pipe-in-pipe system can effectively suppress seismic induced vibrations of subsea pipelines without changing too much of the traditional design. Therefore it could be a cost-effective solution to mitigate pipe vibrations subjected to external dynamic loadings.

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Section: Subsea Pipe-in-pipe Systemsmentioning

confidence: 99%

“…The spring stiffness in the lateral ( ), vertical ( ) and axial ( ) directions is given in Table 2 [34]. These parameters correspond to a soil condition of loose sand [34].…”

Section: Subsea Pipe-in-pipe Systemsmentioning

confidence: 99%

Using pipe-in-pipe systems for subsea pipeline vibration control

Hao

2016

Engineering Structures

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“…It leads to coupled equations for the amplitudes of these Fourier modes. The method not only accounts for axial force and inertia everywhere, but also for dynamic changes in the axial load associated with arch action and is readily extended to multiple interacting spans [13]. However, for accurate solutions a considerable number of Fourier modes need to be included giving rise to coupled equations for the amplitudes of these modes.…”

Section: Introductionmentioning

confidence: 99%

“…solutions that can be written as a product of a function of time t and a function of location x) typically do not exist, except for special cases, such as the simply-supported span. Standard modal analysis, either by finite elements [17] or the Fourier modes of [12,13] employ linearization. Thus, they include the arch action due to sag under gravity loads, but not the nonlinearity due to largeamplitude vibrations.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a Pipeline Span on an Elastic Seabed

Peek¹,

Witz

Vedeld

2021

Applied Ocean Research

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Natural frequencies, mode shapes and modal damping ratios must be estimated to assess subsea pipeline spans for vortex-induced vibrations (VIV) and response to direct wave loading. Several approximate solutions exist for a linearly elastic pipe under constant axial force supported by linearly elastic springs beyond the span's shoulders. An exact analytical solution has only recently been published. That solution is used here in a Rayleigh-Ritz approximation to account for arch action arising from combined effects of sag under gravity loads and axial restraint at the shoulders. The method allows survey data to be used directly to quantify arch action. Its accuracy is confirmed by finite element analysis. Further, the modal damping ratio is estimated based on the fractions of the potential energy in bending, the axial force, and the soil springs, all of which are determined analytically. Thus, it is found that the effective modal damping ratio increases without a bound as the axial load approaches the buckling load in compression.

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“…One marine riser fatigue acoustic telemetry scheme was proposed by Li et al [42] to monitor deep and ultra-deepwater risers' vibration fatigue. Sollund et al [43] studied the dynamic response of multiple ocean pipelines. A semi-analytical method for the multi-spans offshore pipeline was developed by them, which provided a fast and accurate alternative to finite element modeling of potentially interacting spans.…”

Section: Introductionmentioning

confidence: 99%

A Case Study of Floating Offshore Super-Long Steel Pipeline Combing with Field Monitoring

Ren

Cai

et al. 2021

Applied Sciences

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How to control deformation and avoid resonance is the key to ensuring the safety of the super-long pipeline when it is floating in the sea. Based on the deformation warning value of pipeline prototype composite material obtained from laboratory tests, the raw water pipeline project in Tong’an Xiamen adopts wireless communication equipment to transmit data, supplemented by aerial photography technology to monitor and feedback the strain and vibration during the dynamic construction of long-distance pipeline floating transportation. Combined with dynamic construction, this monitoring method avoids excessive deformation and resonance of the steel pipeline during floating transportation, and prevents the destruction of the anticorrosive coating. The airtightness test after completion shows that the whole pipeline meets the acceptance requirements. The monitoring results show that the strain at the bent position of the pipeline is large in the process of floating transportation, and the jacking speed and position of the tugboats have an important influence on the deformation of the pipeline. The same type of project should focus on these aspects and timely feedback monitoring data. At the same time, the study also provides detailed strain, modal analysis and effective monitoring technology for the safety of offshore steel pipeline floating transportation.

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Dynamic response of multi-span offshore pipelines

Cited by 23 publications

References 4 publications

Using pipe-in-pipe systems for subsea pipeline vibration control

Using pipe-in-pipe systems for subsea pipeline vibration control

Dynamics of a Pipeline Span on an Elastic Seabed

A Case Study of Floating Offshore Super-Long Steel Pipeline Combing with Field Monitoring

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