Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
권호 표지
DOI QR코드

DOI QR Code

Design of Subsea Manifold Protective Structure against Dropped Object Impacts

낙하체 충돌을 고려한 심해저 매니폴드 보호 구조물 설계

  • Woo, Sun-Hong (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Kangsu (Offshore Plant Research Division, Korea Research Institute of Ships & Ocean Engineering) ;
  • Choung, Joonmo (Department of Naval Architecture and Ocean Engineering, Inha University)
  • 우선홍 (인하대학교 조선해양공학과) ;
  • 이강수 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Received : 2017.02.21
  • Accepted : 2017.06.09
  • Published : 2017.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Subsea structures are always vulnerable to accidental risks induced by fishing gear, dropped objects, etc. This paper presents the design of a subsea manifold protective structure that protects against dropped object impacts. Probable dropped object scenarios were established considering the shapes and masses of the dropped objects. A design layout for the manifold protective structure was proposed, with detailed scantlings and material specifications. A method applicable to the pipelines specified in DNV-RP-F107(DNV, 2010) was applied to calculate the annual probabilities of dropped objects hitting the subsea manifold. Nonlinear finite element analyses provided the structural consequences due to the dropped object impacts such as the maximum deflections of the protective structure and the local fracture occurrences. A user-subroutine to implement the three-dimensional fracture strain surface was used to determine whether local fractures occur. The proposed protective structure was shown to withstand the dropped object impact loads in terms of the maximum deflections, even though local fractures could induce accelerated corrosion.

Keywords

References

  1. Aanesland, V., 1987. Numerical and Experimental Investigation of Accidental Falling Drilling Pipes. Proceeding of the 19th Offshore Technology Conference, USA Huston, No 5497.
  2. American Petroleum Institute(API), 2013. ANSI/API Recommended Practice 17P Design and Operation of Subsea Production Systems-Subsea Structures and Manifolds. USA : API.
  3. American Petroleum Institute(API), 2006. API Recommended Practice 2FB Recommended Practice for the Design of Offshore Facilities Against Fire and Blast Loading. USA : API.
  4. Arasaratnam, P., Sivakumaran, K.S., Tait, M.J., 2011. True Stress-True Strain Models for Structural Steel Elements. International Scholarly Research Network, 2011, No 656401.
  5. Bai, Y., Wierzbicki, T., 2008. A New Model of Metal Plasticity and Fracture with Pressure and Lode Dependence. International Journal of Plasticity, 24(6), 1071-1096. https://doi.org/10.1016/j.ijplas.2007.09.004
  6. Bai, Y., Wierzbicki, T., 2010 Application of Extended Mohr-Coulomb Criterion to Ductile Fracture. International Journal of Fracture, 161(1), 1-20. https://doi.org/10.1007/s10704-009-9422-8
  7. Basu, S., Benzerga, A.A., 2015. On the Path-dependence of the Fracture Locus in Ductile Materials: Experiments. International Journal of Solids and Structures, 71, 79-90. https://doi.org/10.1016/j.ijsolstr.2015.06.003
  8. Benzerga, A.A., Surovik, D., Keralavarma, S.M., 2012. On the Path-dependence of the Fracture Locus in Ductile Materials-analysis. International Journal of Plasticity, 37, 157-170. https://doi.org/10.1016/j.ijplas.2012.05.003
  9. Choung, J., Nam, W., 2013. Formulation of Failure Strain According to Average Stress Triaxiality of Low Temperature High Strength Steel (EH-36). Journal of Ocean Engineering and Technology, 27(2), 19-26. https://doi.org/10.5574/KSOE.2013.27.2.019
  10. Choung, J., Nam, W., Kim, S., 2014a. Fracture Simulation of Low-temperature High Strength Steel (EH36) using User-subroutione of Commercial Finite Element Code. Journal of Ocean Engineering and Technology 28(1): 33-46.
  11. Choung, J., Nam, W., Lee, D., Song, S.Y., 2014b. Failure Strain Formulation Via Average Stress Triaxiality of an High Strength Steel for Arctic Structures. Ocean Engineering 91: 33-46.
  12. Choung, J., Park, S.J., Kim, Y,H., 2015a. Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part I Theoretical Background and Experimental Studies. Journal of Ocean Engineering and Technology, 29(6), 445-453. https://doi.org/10.5574/KSOE.2015.29.6.445
  13. Choung, J., Park, S.J., Kim, Y.H., 2015b. Development of Three Dimensional Fracture Strain Surface in Average Stress Triaxiaility and Average Normalized Lode Parameter Domain for Arctic High Tensile Steel: Part II Formulation of Fracture Strain Surface. Journal of Ocean Engineering and Technology, 29(6), 454-462. https://doi.org/10.5574/KSOE.2015.29.6.454
  14. Choung, J., Shim, C.S., Kim, K.S., 2011. Plasticity and Fracture Behaviors of Marine Structural Steel, Part III Expertimental Study on Failure Strain. Journal of Ocean Engineering and Technology, 25(3), 53-66. https://doi.org/10.5574/KSOE.2011.25.3.053
  15. Choung, J., Shim, C.S., Song H.C., 2012. Estimation of Failure Strain of EH36 High Strength Marine Structural Steel using Average Stress Triaxiality. Marine Structures, 29(1), 1-21. https://doi.org/10.1016/j.marstruc.2012.08.001
  16. Det Norske Veritas(DNV), 2010. Recommend and Practice DNV-RP-F107 Risk Assessment of Pipeline Protection. Norway, DNV.
  17. Dunnad, M., Mohr, D., 2011. On the Predictive Capabilities of the Shear Modified Gurson and the Modified Mohr-Coulomb Fracture Models over a Wide Range of Stress Triaxialities and Load Angles. Journal of the Mechanics and Physics of Solids, 59(7), 1374-1394. https://doi.org/10.1016/j.jmps.2011.04.006
  18. Katteland, L.H., Oeygarden, B., 1995. Risk Analysis of Dropped Objects for Deep Water Development. International Conference on Offshore Mechanics and Arctic Engineering, 18-22.
  19. Liping, S., Siqi L., Shangmao, Ai., 2016. A Simplified Probabilistic Method for Dropped Objects Hitting Subsea Equipment. International Conference on Ships and Offshore Structures, 89-98.
  20. Lou, Y., Huh, H., Lim, S., Pack, K., 2012., New Ductile Fracture Criterion for Prediction of Facture Forming Limit Diagrams of Sheet Metal. International Journal of Solids and Structures, 49(25), 3605-3615. https://doi.org/10.1016/j.ijsolstr.2012.02.016
  21. Lou, M., Wierzbicki, T., 2010. Numerical Failure Analysis of a Stretch-bending Test on Dual-phase Steel Sheets Using a Phenomenological Fracture Model. International Journal of Solids and Structures, 47(22), 3084-3102. https://doi.org/10.1016/j.ijsolstr.2010.07.010
  22. Norsk Sokkels Konkurranseposisjon(NORSOK), 2002. NORSOK Stnadard U-001, Subsea Production Systems. Norway, NORSOK.
  23. Park S., Choung J., 2015. Basic Design of Deep Subsea Manifold Frame Sturcture for Oil Production. Journal of Ocean Engineering and Technology, 29(3), 207-216. https://doi.org/10.5574/KSOE.2015.29.3.207
  24. Simulia, 2008. Abaqus User Manual. Silumia.
  25. Thomas, N., Basu, S., Benzerga, A.A., 2016. On Fracture Loci of Ductile Materials under Non-proportional Loading. International Journal of Mechanical Sciences, 117, 135-151. https://doi.org/10.1016/j.ijmecsci.2016.08.007
  26. Yu, H., Olsen, J.S., He, J., Zhang, Z. 2016. Effects of Loading Path on the Fracture Loci in a 3D Space. Engineering Fracture Mechanics, 151, 22-36. https://doi.org/10.1016/j.engfracmech.2015.11.005