Abstract
This paper presents an analytical scheme for predicting the collapse strength of a flexible pipe, which considers the structural interaction between relevant layers. The analytical results were compared with a FEA model and a number of test data, and showed reasonably good agreement. The theoretical analysis showed that the pressure armor layer enhanced the strength of the carcass against buckling, though the barrier weakened this effect. The collapse strength of pipe was influenced by many factors such as the inner radius of the pipe, the thickness of the layers and the mechanical properties of the materials. For example, an increase in the thickness of the barrier will increase contact pressure and in turn reduce the critical pressure.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Clinedinst WO (1939). A rational expression for the critical collapsing pressure of pipe under external pressure. API Drilling and Production Practice, 383–420.
Loureiro Jr WC, Pasqualino I (2012). Numerical-analytical prediction of the collapse of flexible pipes under bending and external pressure. Proceedings of the ASME 31th International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil. DOI: 10.1115/OMAE2012-83476
Lu J, Ma F, Tan, ZM, Sheldrake T (2008). Bent collapse of an unbonded rough bore flexible pipe. Proceedings of the ASME 27th International Conference on Ocean, Offshore and Arctic Engineering, Estoril, Portugal. DOI: 10.1115/OMAE2008-57063
Neto AG, Martins CA (2011). flexible pipes: influence of pressure armor in the wet collapse resistance. Proceedings of the ASME 30th International Conference on Ocean, Offshore and Arctic Engineering, Rotterdam, the Netherlands. DOI: 10.1115/OMAE2011-49105
Tang M, Yan J, Wang Y (2012). collapse estimation of interlocked armor of flexible pipe with strain energy equivalence. Proceedings of the ASME 31th International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil. DOI: 10.1115/OMAE2012-83705
Timoshenko S (1941). Strength of materials, part ii, advanced theory and problems. 2nd Edition, D Van Nostrand Company, Inc.
Young WC, Budynas RG (2002). Roark's Formulas for Stress and Strain. Seventh Edition, McGraw-Hill Professional.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Chen, Y.G., Liu, J., Zhu, L.F. et al. An analytical approach for assessing the collapse strength of an unbonded flexible pipe. J. Marine. Sci. Appl. 14, 196–201 (2015). https://doi.org/10.1007/s11804-015-1304-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11804-015-1304-z