Submarine Pipeline On-Bottom Stability: Recent AGA Research

Allen, Don; Lammert, W.F.; Hale, J.R.; Jacobsen, V.

doi:10.4043/6055-ms

Cited by 28 publications

(15 citation statements)

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“…The above experimental results are reflected in the Veritec's and AGA's design guidelines [4,6]. However, in the above experiments the cyclic loading simulating the wave loading is provided by actuators, so it differs from the real hydrodynamic force.…”

Section: Voi17 No1 Gu Xiaoyun Et Al: Wave-soil-pipe Coupling Effementioning

confidence: 99%

Wave-soil-pipe coupling effect on submarine pipeline on-bottom stability

2001

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Wave-soil-pipe coupling effect on the untrenched pipeline stability on sands is for the first time investigated experimentally. Tests are conducted in the Ushaped water tunnel, which generates an oscillatory flow, simulating the water particle movements with periodically changing direction under the wave action. Characteristic times and phases during the instability process are revealed. Linear relationship between Froude number and non-dimensional pipe weight is obtained. Effects of initial embedment and loading history are observed. Test results between the wavesoil-pipe interaction and pipe-soil interaction under cyclic mechanical loading axe compared. The mechanism is briefly discussed. For applying in the practical design, more extensive and systematic investigations are needed.

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Section: Voi17 No1 Gu Xiaoyun Et Al: Wave-soil-pipe Coupling Effementioning

confidence: 99%

Wave-soil-pipe coupling effect on submarine pipeline on-bottom stability

2001

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“…Since 1980's, many foreign scientific institutes [1][2][3][4][5][6] have conducted the further research to the pipe/soil interaction of the untrenched pipe by the cyclic loading. The main conclusions are: the hydrodynamic force induced by wave and current can lead to the pipe's additional penetration, and the soil lateral moundings beneath the pipe will take place when the pipe's lateral displacement happens, these will cause that the soil's lateral resistance to the pipe is larger than Coulomb friction force, so the lateral resistance coefficient larger than Coulomb friction coefficient.…”

Section: Fig1 Pipe/soil Interactionmentioning

confidence: 99%

The Analysis of Pipeline’s Penetration Laid on the Elastic-Plastic Seabed Based on the ABAQUS Software

Ren

Liu

2013

AMR

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Abstract. The pipeline's stability is the key problem of submarine pipeline's design. In order to supply the theory basis for the pipeline's design, the ABAQUS software has been adopted to analyze the pipe/soil system. The Ramberg-Osgood model has been adopted to simulate the seabed; the contact pair also adopted to simulate the pipe/soil system, the dynamic boundary contact problem of pipe embedded into the seabed has been analyzed. The computation has been operated according to change pipe's subweight, environment load, pipe's diameter, yielding stress and so on. The computation results have shown that these parameters have effects on the pipe's penetration.

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“…This line can be regarded as the critical line for pipe onbottom instability. However, in the previous experiments (Allen et al, 1989;Brennodden et al, 1986;Wagner et al, 1987;Brennodden et al, 1989), mechanical actuator was used to simulate the real hydrodynamic forces upon pipelines. So the pipe-soil interaction models obtained by the experiments do not include wave parameters (see Eqs.…”

Section: Comparison With Previous Experimentsmentioning

confidence: 99%

“…1). These are the multi-client project 'PIPESTAB' (1985'PIPESTAB' ( -1987 and the 'AGA-project ' (1987-1988) (Allen et al, 1989;Brennodden et al, 1986;Wagner et al, 1987;Brennodden et al, 1989). A considerable experience was gained, including an empirical pipe-soil interaction model and an energy based pipe-soil interaction model proposed by Wagner et al (1987) and Brennodden et al (1989), respect- Fig.…”

Section: Introductionmentioning

confidence: 99%

Physical modeling of untrenched submarine pipeline instability

Gao

Jeng

2003

Ocean Engineering

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Wave-induced instability of untrenched pipeline on sandy seabed is a 'wave-soil-pipeline' coupling dynamic problem. To explore the mechanism of the pipeline instability, the hydrodynamic loading with U-shaped oscillatory flow tunnel is adopted, which is quite different from the previous experiment system. Based on dimensional analysis, the critical conditions for pipeline instability are investigated by altering pipeline submerged weight, diameter, soil parameters, etc. Based on the experimental results, different linear relationships between Froude number (Fr) and non-dimensional pipeline weight (G) are obtained for two constraint conditions. Moreover, the effects of loading history on the pipeline stability are also studied. Unlike previous experiments, sand scouring during the process of pipe's losing stability is detected in the present experiments. In addition, the experiment results are compared with the previous experiments, based on Wake II model for the calculation of wave-induced forces upon pipeline. It shows that the results of two kinds of experiments are comparable, but the present experiments provide better physical insight of the wave-soil-pipeline coupling effects. 

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Submarine Pipeline On-Bottom Stability: Recent AGA Research

Cited by 28 publications

References 0 publications

Wave-soil-pipe coupling effect on submarine pipeline on-bottom stability

Wave-soil-pipe coupling effect on submarine pipeline on-bottom stability

The Analysis of Pipeline’s Penetration Laid on the Elastic-Plastic Seabed Based on the ABAQUS Software

Physical modeling of untrenched submarine pipeline instability

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