Ocean Systems Engineering

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Three dimensional finite element analysis of 4 inch smart flange on offshore pipeline

  • Received : 2014.08.10
  • Accepted : 2014.12.05
  • Published : 2014.12.25
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Abstract

Smart flanges are used for pipeline and riser repair in subsea. In a typical case in the gas export pipeline project, the end cap bolts of a 4inch smart flange were broken during operation, and in turn leakage occurred. This work presents the detail of three dimensional finite element analysis of the smart flange to support the observed end cap bolts failure. From finite element analysis it turns out that in the presence of external bending moment, an uneven contact distribution is present between seal and end cap, which in turn changes the uniform load distribution on bolts and threaten the integrity of bolts. On the other hand, 3D finite element analysis of interaction between pipeline and seabed is presented by means of Abaqus to explore the distribution of bending moment along the pipeline route. It is found that lateral buckling occurs in the pipeline which introduces large bending moment.

Keywords

References

  1. ANSI/API SPEC 5L, Specification for Line Pipe
  2. API SPEC 6H, Specification on End Closures, Connectors and Swivels
  3. ASME/ANSI B16.5, Pipe Flanges and Flanged Fittings
  4. ASME/ANSI B16.47, Large Diameter Pipe Flanges
  5. Bakker, A. and Spaas, H. (1977), "A computational procedure for the stress and deformation analysis of high-pressure vessel flanges", Int. J. Pressure Vessels Piping, 5(1), 1-22. https://doi.org/10.1016/0308-0161(77)90015-1
  6. Delavar, A.N., Shayegani, M. and Pasha, A. (2013), "An investigation of cracking causes in an outlet RTJ flange in ISOMAX unit", Case Studies Eng. Fail. Anal., 1(2), 61-66. https://doi.org/10.1016/j.csefa.2013.04.002
  7. DNV-OS-F101, Submarine Pipeline Systems.
  8. DNV-RP-F109, On-Bottom Stability Design of Submarine Pipelines.
  9. DNV-RP-F110, Global Buckling Of Submarine Pipelines.
  10. DNV-RP-F113, Pipeline Subsea Repair.
  11. Elshafey, A.A., Haddara, M.R. and Marzouk, H. (2011), "Free spans monitoring of subsea pipelines", Ocean Syst. Eng., 1(1), 59-72. https://doi.org/10.12989/ose.2011.1.1.059
  12. Hoang, V.L., Jaspart, J. and Demonceau, J. (2013), "Behaviour of bolted flange joints in tubular structures under monotonic, repeated and fatigue loadings I: Experimental tests", J. Constr. Steel Res., 85, 1-11. https://doi.org/10.1016/j.jcsr.2013.02.011
  13. Krishna, M.M., Shunmugam, M.S. and Siva Prasad, N. (2007), "A study on the sealing performance of bolted flange joints with gaskets using finite element analysis", Int. J. Pressure Vessels Piping, 84(6), 349-357. https://doi.org/10.1016/j.ijpvp.2007.02.001
  14. Major, Z. and Lang, R.W. (2010), "Characterization of the fracture behavior of NBR and FKM grade elastomers for oilfield applications", Eng. Fail. Anal., 17(3), 701-711. https://doi.org/10.1016/j.engfailanal.2009.08.004
  15. Mathan, G. and Siva Prasad, N. (2011), "Studies on gasketed flange joints under bending with anisotropic Hill plasticity model for gasket", Int. J. Pressure Vessels Piping, 88(11-12), 495-500. https://doi.org/10.1016/j.ijpvp.2011.07.010
  16. Muhammad, A. (2006), "Determination of safe operating conditions for gasketed flange joint under combined internal pressure and temperature: a finite element approach", Int. J. Pressure Vessels Piping, 83(6), 433-441. https://doi.org/10.1016/j.ijpvp.2006.02.029
  17. Nagy, A. (1996), "Determination of the gasket load drop at large size welding neck flange joints in the case of nonlinear gasket model", Int. J. Pressure Vessels Piping, 67(3), 243-248. https://doi.org/10.1016/0308-0161(95)00021-6
  18. Neelamani, S. and Al-Banaa, K. (2013), "A scientific approach to estimate the safe depth of burial of submarine pipelines against wave forces for different marine soil condition", Ocean Syst. Eng., 3(1) 9-34. https://doi.org/10.12989/ose.2013.3.1.009
  19. Otegui, J.L., Fazzini, P.G. and Marquez, A. (2009), "Common root causes of recent failures of flanges in pressure vessels subjected to dynamic loads", Eng. Fail. Anal., 16, 1825-1836. https://doi.org/10.1016/j.engfailanal.2008.08.027
  20. Semke, W.H., Bibel, G.D., Jerath, S., Gurav, S.B. and Webster, A.L. (2006), "Efficient dynamic structural response modelling of bolted flange piping systems", Int. J. Pressure Vessels Piping, 83(10), 767-776. https://doi.org/10.1016/j.ijpvp.2006.06.003
  21. Shaghaghi, A.M. and Mohammadnia, S. (2013), "Three dimensional finite element analysis of offshore pipeline with Abaqus", Proceedings of the 5th Iranian Pipe & Pipeline Conference, Dec 2013, Iran, Tehran.
  22. Yong, B. (2001), Pipeline and Risers, Elsevier Ocean Engineering Book.

Cited by

  1. Static metal sealing mechanism of a subsea pipeline mechanical connector vol.8, pp.7, 2016, https://doi.org/10.1177/1687814016654821
  2. Analysis of offshore pipeline laid on 3D seabed configuration by Abaqus vol.5, pp.1, 2015, https://doi.org/10.12989/ose.2015.5.1.031
  3. Failure Analyses of Propagation of Cracks in Repaired Pipe Under Internal Pressure vol.19, pp.1, 2019, https://doi.org/10.1007/s11668-019-00592-3