Investigation on scour protection of submarine piggyback pipeline

Yang, Shaopeng; Shi, Bing; Guo, Yakun; Liu, Yang

doi:10.1016/j.oceaneng.2019.04.090

Cited by 8 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When d/D = 0.5, the C + L of the small pipeline is about 2-3 times that of the large one, while C − L is about 0.5 times that of the large pipeline. (6) In practical engineering, the Morrison equation is widely used in hydrodynamic analysis and calculation of submarine pipelines, and the value of hydrodynamic coefficient is the most important one. The stability and safety evaluation of the submarine piggyback pipeline should not only investigate the overall stability of the pipeline system, but also investigate the stability of the large and small pipeline, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Kamarudin et al [4] and Zhao et al [5] numerically simulated the hydrodynamic characteristics of the piggyback pipeline under the condition of steady flow, and obtained the pressure distribution, hydrodynamic coefficient and vortex shedding modes around the pipeline with different Re numbers. Yang et al [6] studied the influence of different piggyback configurations on local seabed scour patterns under the action of steady flow through laboratory tests and numerical simulation. Asrari Sahar et al [7] studied the effect of the pipeline diameter ratio and the gap ratio between pipelines on the scour below the piggyback pipeline under the action of steady flow through numerical simulation and experimental testing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Hydrodynamic Coefficients of a Submarine Piggyback Pipeline under the Action of Waves and Current

Cheng

Yang

et al. 2021

JMSE

View full text Add to dashboard Cite

In this study, physical model tests are used to investigate the effects of a varying number of wave and current parameters, the gap ratios between the pipeline and seabed, the spacing ratios between the two pipelines and the diameter ratios on the hydrodynamic coefficients of the large, small pipeline and pipeline system (bundle) in a piggyback configuration under the combined action of waves and current. The results show that, compared with the pure wave field, the existence of the steady current will lead to a decrease in hydrodynamic coefficients. In addition, the results indicate clear differences between the hydrodynamic coefficients of the large pipeline, small pipeline and piggyback pipeline system. The experimental results on hydrodynamic coefficients can be used as an important basis for the safety design of a submarine piggyback pipeline.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Hydrodynamic Coefficients of a Submarine Piggyback Pipeline under the Action of Waves and Current

Cheng

Yang

et al. 2021

JMSE

View full text Add to dashboard Cite

show abstract

“…Zhao et al [25] adopted the laboratory experiments and numerical models to study the effects of gap ratio, inflow Reynolds number, and pipe diameter on the scour depth in a steady current. Based on the results of laboratory tests and numerical simulations for a traditional piggyback pipeline, Yang et al [26] proposed a novel piggyback pipeline configuration, which can effectively decrease the pressure difference between the upside and downside of a pipeline, and consequently reduce scour depth. More recently, Yang et al [27] examined and discussed the effects of a small pipeline on scour topography in the vicinity of a piggyback pipeline under a steady current by numerical simulation, indicating that the small pipeline installed at the upstream edge of the large pipeline leads to more serious scour.…”

Section: Introductionmentioning

confidence: 99%

Scour Characteristics and Equilibrium Scour Depth Prediction around a Submarine Piggyback Pipeline

Wang

Liu

et al. 2022

JMSE

View full text Add to dashboard Cite

Local scour around a submarine piggyback pipeline in combined waves and current is investigated experimentally. Based on the experimental results, the scour evolution and scour morphology are firstly analyzed. Then, a comparison with the equilibrium scour depth Seq between the present experimental data and predicted results is conducted. After that, the correlation between the dimensionless scour timescale T* and the maximum Shields parameter θcw is investigated, and a formula is obtained to describe the variation trend between T* and θcw for different gap ratios G/D. Furthermore, the parametric study is carried out to study the effects of Reynolds number Red and θcw on Seq, respectively. The results indicate that the Seq below the piggyback pipeline increases when the gap ratio G/D increases from 0 to 0.1, and it gradually decreases when G/D > 0.1. For a given KC, the Seq increases with the increase of the ratio of velocities Ucw. In addition, when Ucw is fixed, a higher KC results in a greater Seq. The T* is closely related to θcw and G/D. The higher Red and θcw both tend to result in the greater scour depth below a piggyback pipeline in combined waves and current.

show abstract

“…Over the last decade, a large number of AI approaches have been employed prosperously to obtain an accurate estimation of the local scour depth below pipelines exposed to currents and regular waves. In fact, Artificial A large number of experimental studies have been carried out to better understand scouring mechanisms at submarine pipelines; the papers from [4][5][6][7][8][9][10][11][12][13][14] in the references section are some examples. Generally, all the experimental studies were carried out in three distinctive flow conditions: (1) Current, (2) regular wave, and (3) combined current and wave.…”

Section: Introductionmentioning

confidence: 99%

Exploring 3D Wave-Induced Scouring Patterns around Subsea Pipelines with Artificial Intelligence Techniques

Najafzadeh

Oliveto

2021

Applied Sciences

View full text Add to dashboard Cite

Subsea pipelines carry oil or natural gas over long distances of the seabed, but fluid leakage due to a failure of the pipeline can culminate in huge environmental disasters. Scouring process may take place beneath pipelines due to current and/or wave action, causing pipeline suspension and leading to the risk of pipeline failure. The resulting morphological variations of the seabed propagate not only below and normally to the pipeline but also along the pipeline itself. Therefore, 3D scouring patterns need to be considered. Mainly based on the experimental works at laboratory scale by Cheng and coworkers, in this study, Artificial Intelligent (AI) techniques are employed to present new equations for predicting three dimensional current- and wave-induced scour rates around subsea pipelines. These equations are given in terms of key dimensionless parameters, among which are the Shields’ parameter, the Keulegan–Carpenter number, relative embedment depth, and wave/current angle of attach. Using various statistical benchmarks, the efficiency of AI-models-based regression equations is assessed. The proposed predictive models perform much better than the existing empirical equations from literature. Even more interestingly, they exhibit a clear physical consistence and allow for highlighting the relative importance of the key dimensionless variables governing the scouring patterns.

show abstract

Investigation on scour protection of submarine piggyback pipeline

Cited by 8 publications

References 33 publications

Study on Hydrodynamic Coefficients of a Submarine Piggyback Pipeline under the Action of Waves and Current

Study on Hydrodynamic Coefficients of a Submarine Piggyback Pipeline under the Action of Waves and Current

Scour Characteristics and Equilibrium Scour Depth Prediction around a Submarine Piggyback Pipeline

Exploring 3D Wave-Induced Scouring Patterns around Subsea Pipelines with Artificial Intelligence Techniques

Contact Info

Product

Resources

About