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Documentation and references

A number of papers have been published over the years along with new developments within the BFLEX framework, see list below.

Two flexible pipes have been instrumented with strain sensors on the outer tensile armour layers for verification of BFLEX stress results. Refer to the publications at OMAE 1998 and 2002. Another pipe was instrumented with fibre optic sensors on the inner tensile armour layer. The results for this test compared to BFLEX analysis results are reported in a paper in Computers & Structures 2011.

During the Test JIP run by Shell Rijswik, 16 flexible pipes were dissected and inspected for failure after full scale fatigue testing. The performance of BFLEX is shown in the table below.

TestSummary
Figure 1. BFLEX prediction of failure versus results from full scale testing of 16 flexible pipes

Refer also to the Examples section of the BFLEX2010 User Manual. In this section, BFLEX results are compared to moment-curvature test results for different modeling approaches eithin BFLEX. For lateral buckling of armour wires under compression, BFLEX results are also compared to results reported in other publications.

Key Publications

Other Publications

  • Haitao Hu, Jun Yan, Svein Sævik, Naiquan Ye, Qingzhen Lu, Yufeng Bu: Nonlinear bending behavior of a multilayer copper conductor in a dynamic power cable, Ocean Engineering, Volume 250, 2022, 110831, ISSN 0029-8018, Link

  • Tianjiao Dai, Svein Sævik, Naiquan Ye, Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals, Marine Structures, Volume 72, 2020, 102724, ISSN 0951-8339, Link

  • Dai, Tianjiao; Sævik, Svein; Ye, Naiquan. (2019) Corrigendum to “An anisotropic friction model in non-bonded flexible risers” [Marine Structures volume 59 (2018) [423–443]. Marine Structures Link

  • Dai, Tianjiao; Sævik, Svein; Ye, Naiquan. (2018) An anisotropic friction model in non-bonded flexible risers. Marine Structures Link

  • Dai, Tianjiao; Sævik, Svein; Ye, Naiquan. (2017) Friction models for evaluating dynamic stresses in non-bonded flexible risers. Marine Structures Link

  • Dai, Tianjiao; Ye, Naiquan; Sævik, Svein. (2017) OMAE2017-62644 The Effect of Stick Stiffness of Friction Models on the Bending Behavior in Non-Bonded Flexible Risers. The American Society of Mechanical Engineers (ASME) Link

  • Chongyao Zhou, Svein Sævik, Naiquan Ye, Guomin Ji: Effect of Lay Angle of Anti-buckling Tape on Lateral Buckling Behavior of Tensile Armors, Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, May 31-June 5, 2015, St. John’s, Newfoundland, Canada, OMAE2015-41527

  • Zhou, C, Ye, N, & Sævik, S: Effect of Anti-Wear Tape on Behavior of Flexible Risers. Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 6B: Pipeline and Riser Technology. San Francisco, California, USA. June 8–13, 2014. V06BT04A030. ASME. Link

  • Svein Sævik & Guomin Ji: Differential equation for Evaluating Transverse Buckling Behaviour of Tensile Armour Wires, OMAE2014-24158, Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, June 8-13, 2014, San Francisco, California, USA

  • Ye, N, Sævik, S & Zhou, C: Investigation of anti-wear tape’s influence on bending behavior of one flexible riser, ISOPE'2014, TPC-1010, ISBN 978-1-880653-91-3, Pages 257-264, 2014

  • Sævik, S, & Li, H. Shear Interaction and Transverse Buckling of Tensile Armours in Flexible Pipes. Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 4A: Pipeline and Riser Technology. Nantes, France. June 9–14, 2013. V04AT04A013. ASME. Link

  • Ye, N & Sævik, S: Multi-axial fatigue of pressure armors in flexible risers, OMAE'2011-50210, 2011

  • Svein Sævik: Theoretical and experimental studies of stresses in flexible pipes, Computers & Structures,Volume 89, Issues 23–24, 2011,Pages 2273-2291, ISSN 0045-7949, Link

  • Sævik, S, Gjøsteen, J.K., & Figenschou, A. Comparison Between Predicted and Measured Umbilical Bending Stresses During Manufacturing. Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology; Offshore Wind Energy; Ocean Research Technology; LNG Specialty Symposium. Hamburg, Germany. June 4–9, 2006. pp. 615-621. ASME. Link

  • Svein Sævik & Ragnar Igland: Calibration of a Flexible Pipe Tensile Armour Stress Model Based on Fibre Optic Monitoring, OMAE2002-28092, Proceedings of OMAE 2002, 23-28th June 2002 Oslo Norway

  • Sævik, S., Gray, L., Phan, A. : A Method for Calculating Residual and Transverse Stress Effects in Flexible Pipe Pressure Spirals, OMAE, Rio de Janeiro, 2001.

  • Svein Sævik: A finite element model for predicting longitudinal stresses in non-bonded pipe pressure armours, Proceedings of MARINFLEX'99 , 1999

  • Sævik, S., Giertsen, E., and Olsen, G. P. (1998). A new method for calculating stresses in flexible pipe tensile armours. In Proc. of OMAE 1998

  • Svein Sævik: A finite element model for predicting stresses and slip in flexible pipe armouring tendons, Computers & Structures, 46(2), 1993, Pages 219-230

Contact

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