Influence of Suspension Length on the Mechanical Response of Submarine Flexible Pipe under Internal Pressure and Transverse Load

2013 ◽  
Vol 671-674 ◽  
pp. 884-887
Author(s):  
Fan Gu ◽  
Hui Xin Wang ◽  
Dan Wang ◽  
Jia Quan Sun
Keyword(s):  
Internal Pressure ◽  
Mechanical Response ◽  
Axial Stress ◽  
Steel Wire ◽  
Element Model ◽  
Transverse Load ◽  
Submarine Pipeline ◽  
Flexible Pipe ◽  
Actual Structure ◽  
Rubber Layer

According to the actual structure of submarine flexible pipe, considering the combined effect of internal pressure and transverse load by wave-current flow that is based on 50 year return period wave statistics data of Cheng Dao sea area, ANSYS finite element model of flexible pipe is established. The influence of internal pressure and suspension length on the axial stress of steel wire reinforcement layer and the Mises stress of rubber layer was analyzed. Comparatively, suspension is the main cause for the failure of steel submarine pipeline, but could hardly lead to the failure of submarine flexible pipe, which shows that flexible pipe is stronger applicable for submarine pipeline.

Numerical Study on Mechanical Response of Steel Wire Wound Reinforced Rubber Flexible Pipe under Internal Pressure

2012 ◽  
Vol 594-597 ◽  
pp. 2668-2671
Author(s):  
Fan Gu ◽  
Hui Xin Wang ◽  
Li Sun
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Internal Pressure ◽  
Mechanical Response ◽  
Steel Wire ◽  
Element Model ◽  
Flexible Pipe ◽  
Loading Test ◽  
Actual Structure ◽  
Finite Element Software

According to the actual structure of steel wire wound reinforced rubber flexible pipe, using the finite element software ANSYS, 3-D finite element model of flexible pipe is established. For the mechanical response of flexible pipe under internal pressure, the comparison on the result by numerical calculation, the static loading test and the result by analytic method shows that the 3-D finite element model of flexible pipe is rational. Moreover, based on the finite element model of flexible pipe, the influence of internal pressure, spanning length and reinforced steel wire diameter on the axial stress of the innerest steel layer and the Mises stress of the innerest rubber layer is analyzed.

Study on Optimal Winding Angle of Submarine Oil Flexible Pipe

2012 ◽  
Vol 602-604 ◽  
pp. 2223-2226
Author(s):  
Fan Gu ◽  
Gan Song ◽  
Qiao Jin ◽  
Hui Xin Wang
Keyword(s):  
Numerical Model ◽  
Static Loading ◽  
Mechanical Response ◽  
Transverse Load ◽  
Flexible Pipe ◽  
Loading Test ◽  
Actual Structure ◽  
Finite Element Software ◽  
Static Loading Test ◽  
Winding Angle

According to the actual structure, using the finite element software ANSYS, numerical model of submarine oil flexible pipe was established. For the mechanical response of flexible pipe under the combined effect of internal pressure load and transverse load, the comparison on the result by numerical calculation and static loading test shows that the numerical model of flexible pipe is rational. Moreover, based on the numerical model of flexible pipe, this paper indicates that the maximum Mises stress occurs at the end of flexible pipe, which would lead to the bulge performance failure. Furthermore, the influence of winding angle on the mechanical properties of flexible pipe was analyzed, and the optimal winding angle 30° was suggested to adopt.

Study on the Influence of Transverse Load on the Mechanical Response of Submarine Flexible Pipe

2012 ◽  
Vol 256-259 ◽  
pp. 1042-1045
Author(s):  
Fan Gu ◽  
Dan Wang ◽  
Hui Xin Wang ◽  
Jia Quan Sun
Keyword(s):  
Numerical Model ◽  
Mechanical Response ◽  
Current Flow ◽  
Transverse Load ◽  
Operating Pressure ◽  
Hydrodynamic Load ◽  
Flexible Pipe ◽  
Actual Structure ◽  
Data Statistics ◽  
Sea Area

Taking 1 year return period wave data statistics of Cheng Dao sea area as an example, the wave-current flow hydrodynamic load acting on submarine flexible pipe was analyzed. According to the actual structure of submarine flexible pipe, ANSYS numerical model was established. Under the combined effect of internal operating pressure and transverse wave-current flow hydrodynamic load, the results calculated by numerical model shows that with the increase of transverse load, the bending deformation of flexible pipe increases linearly, and the stress of flexible pipe is almost constant.

On the Structural Response of a Flexible Pipe With Damaged Tensile Armor Wires

2011 ◽  
Author(s):  
Jose´ Renato M. de Sousa ◽  
George C. Campello ◽  
Antoˆnio Fernando B. Bueno ◽  
Eduardo Vardaro ◽  
Gilberto B. Ellwanger ◽  
...  
Keyword(s):  
Mechanical Response ◽  
High Stress ◽  
Three Dimensional ◽  
Structural Response ◽  
Experimental Tests ◽  
Element Model ◽  
Axial Stiffness ◽  
Stress Concentrations ◽  
Flexible Pipe ◽  
Flexible Pipes

This paper studies the structural response of a 6.0″ flexible pipe under pure tension considering two different situations: the pipe is intact or has five wires broken in its outer tensile armor. A three-dimensional nonlinear finite element model devoted to analyze the local mechanical response of flexible pipes is employed in this study. This model is capable of representing each wire of the tensile armors and, therefore, localized defects, including total rupture, may be adequately represented. Results from experimental tests are also presented in order to validate the theoretical estimations. The theoretical and experimental results indicate that the imposed damage reduced the axial stiffness of the pipe. High stress concentrations in the wires near the damaged ones were also observed and, furthermore, the stresses in the inner carcass and the pressure armor are affected by the imposed damage, but, on the other hand, the normal stresses in the wires of the inner tensile armor are not.

End Fitting Effect on Tensile Armor Stress Evaluation in Bent Flexible Pipe

2014 ◽  
Author(s):  
Linfa Zhu ◽  
Zhimin Tan
Keyword(s):  
Axial Stress ◽  
Local Stress ◽  
Element Model ◽  
Analysis Model ◽  
Flexible Pipe ◽  
Stress Evaluation ◽  
3D Finite Element ◽  
Closed Form Solutions ◽  
The Relationship ◽  
Pipe Bending

The stress evaluation of tensile armor layer in bent unbonded flexible pipe due to end fitting termination is investigated. A preliminary mathematical stress analysis model which accounts for the boundary condition at the end fitting interface is developed. Two shifting parameters are introduced to correct the friction field acting on the tensile wires. Closed form solutions are obtained for the modified friction force, axial stress and displacement. The validity of this model is investigated through a comparison with results obtained using a 3D finite element model. The relationship between the shifting parameters and the initial hoop position of wires is discussed. Studies of local stress elevation on wires with different initial hoop positions are conducted. The results show that end fitting effect could causes a significant stress elevation in a large amount of tensile wires if heavy pipe bending is permitted at the end fitting vicinity.

Numerical Analysis of a Flexible Pipe With Damaged Tensile Armor Wires

2009 ◽  
Author(s):  
Jose´ Renato M. de Sousa ◽  
Aline Nacif Pinho ◽  
Gilberto Bruno Ellwanger ◽  
Edison C. P. Lima
Keyword(s):  
Mechanical Response ◽  
High Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Axial Rotation ◽  
Flexible Pipe ◽  
High Stress Concentration ◽  
Flexible Pipes ◽  
Localized Defects ◽  
Nonlinear Finite Element Model

This paper focus on the structural analysis of a 2.5″ flexible pipe with one up to five broken wires in its outer tensile armor. The pipe is supposed to be under pure tension and the effect of the number of ruptured wires on its response is discussed. A three-dimensional nonlinear finite element model devoted to analyze the local mechanical response of flexible pipes is proposed and employed in all performed analyses. This model is capable of representing each wire of the tensile armors and, therefore, localized defects, including total rupture, may be adequately represented. The obtained results pointed to high stress concentration in the wires near the damaged ones as well as a significant increase in the axial rotation of the pipe. Moreover, the stresses in the inner carcass and the pressure armor are also affected by the rupture of wires in the outer tensile armor.

A Study on the Response of a Flexible Pipe to Combined Axisymmetric Loads

2013 ◽  
Author(s):  
José Renato M. de Sousa ◽  
Carlos Magluta ◽  
Ney Roitman ◽  
Tatiana V. Londoño ◽  
George C. Campello
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Internal Pressure ◽  
Reaction Force ◽  
Experimental Tests ◽  
Element Model ◽  
Tension Test ◽  
Experimental Results ◽  
Flexible Pipe ◽  
Pure Tension

In this work, the response of a 2.5″ flexible pipe to combined and pure axisymmetric loads is studied. A set of experimental tests was carried out and the results obtained are compared to those provided by a previously presented finite element model. The pipe was firstly subjected to pure tension. After that, the response to torsion superimposed with tension combined or not with internal pressure and the response to internal pressure combined with tension were investigated. In all these cases, the induced strains in the tensile armors were measured. Moreover, the axial elongation of the pipe was monitored in the pure tension test, whilst the twist of the pipe was measured when torsion was imposed and the axial reaction force was monitored when internal pressure was applied. The experimental results obtained agreed very well with the theoretical estimations indicating that the response of the pipe to tension and internal pressure is linear, whilst its response to torsion is nonlinear due to friction between layers.

Study on Failure Mechanism of Steel Wire Wound Reinforced High-Pressure Hose

2012 ◽  
Vol 602-604 ◽  
pp. 2219-2222 ◽  
Author(s):  
Fan Gu ◽  
Jia Quan Sun ◽  
Dan Wang
Keyword(s):  
High Pressure ◽  
Internal Pressure ◽  
Failure Criterion ◽  
Static Load ◽  
Steel Wire ◽  
Load Test ◽  
Transverse Load ◽  
Test Results ◽  
Static Load Test ◽  
Steel Sleeve

For steel wire wound reinforced high-pressure hose, the static load test under internal pressure and fatigue test under combined effect of internal pressure and periodic transverse load were carried out. Test results show that water seepage or leakage on the pressing steel sleeve or on hose body itself, and bulging on hose itself near steel joint would lead to performance failure, which can be regarded as the performance failure criterion for steel wire wound reinforced high-pressure hose.

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