Reliability Analysis of Leg Mating Unit under Impact Loads Due To Floatover Installation

Document Type : Research Article

Authors

1 School of Civil Engineering, Iran University of Science and Technology

2 Energy, Civil engineering department, Islamic Azad University, Science and Research Branch, Tehran , iran

3 Offshore industry, Civil engineering department, Islamic Azad University, Science and Research Branch, Tehran , iran

Abstract

Regarding Iran's need to increase its current oilfields production, especially in the South Pars field and decommissioning new fields, it is a necessity to fully understand and comprehend the Floatover installation method as a cost-effective and reliable method and as an alternative for traditional lifting method. This method is complex and demands the study of all environmental parameters and elements involved. All of these parameters contain uncertainty. This study examines the environmental uncertainties and uncertainty in steel by comparing leg mating units and using Taguchi design and response surface methods. A model including a jacket, topside, and a barge with 6 degrees of freedom was developed to assess hydrodynamic analysis in the Persian Gulf. Then, using the Taguchi design and the Box-Behnken method, and by monitoring the maximum Von Mises stress, the explicit limit state function was generated. This stress was calculated using a finite element model that represents impacts and interactions. By creating two limit state functions, a reliability analysis was performed. In these functions, the effect of environmental parameters on the failure of the leg mating units was investigated.  Finally, the effect of environmental uncertainties and the yielding stress of steel in the Floatover method were evaluated using FORM and SORM methods and Monte Carlo simulation. It was concluded that uncertainties in steel and some of the environmental parameters have a significant impact on failure.

Keywords

Main Subjects

References

  1. Lorenti, A. Grime, B. Raine, Design and Installation of the Malampaya Depletion Compression Platform, in: Offshore Technology Conference, Offshore Technology Conference, Houston, Texas, USA, 2016, pp. 10
  2. Liu, H. Li, Floatover Technology, in: G. Liu, H. Li (Eds.) Offshore Platform Integration and Floatover Technology, Springer Singapore, Singapore, 2017, pp. 87-99.
  3. Liu, H. Li, Platform Integration and Stationing, in: G. Liu, H. Li (Eds.) Offshore Platform Integration and Floatover Technology, Springer Singapore, Singapore, 2017, pp. 35-86.
  4. e. al., Float-Over Installation of Topsides, in: Technip Presentation, Technip, 2013.
  5. -A. el Mouhandiz, J. Bokhorst, Analysis and Offshore Support for the Float-Over of a 24,250mT Topsides on the North West Shelf, in, 2013.
  6. Tahar, J. Halkyard, A. Steen, L. Finn, Float Over Installation Method—Comprehensive Comparison Between Numerical and Model Test Results, Journal of Offshore Mechanics and Arctic Engineering, 128(3) (2006) 256-262.
  7. Hu, X. Li, W. Zhao, X. Wu, Nonlinear dynamics and impact load in float-over installation, Applied Ocean Research, 65 (2017) 60-78.
  8. Chen, R. Eatock Taylor, Y.S. Choo, Time domain modeling of a dynamic impact oscillator under wave excitations, Ocean Engineering, 76 (2014) 40-51.
  9. Chen, R. Eatock Taylor, Y.S. Choo, Investigation of the complex dynamics of float-over deck installation based on a coupled heave-roll-pitch impact model, Ocean Engineering, 137 (2017) 262-275.
  10. Sun, R. Eatock Taylor, Y.S. Choo, Multi-body dynamic analysis of float-over installations, Ocean Engineering, 51 (2012) 1-15.
  11. Kocaman, D. Kim, J. Seto, Float-over of Arthit PP Deck, in: Offshore Technology Conference, Offshore Technology Conference, Houston, Texas, USA, 2008, pp. 11.
  12. -S. Tan, S. Sahasrabudhe, J.A. Haney, B.-L. Leow, Arthit Field Development: Float-over Hardware Design and Issues, in: Offshore Technology Conference, Offshore Technology Conference, Houston, Texas, USA, 2008, pp. 11.
  13. -J. Jung, W.-S. Lee, H.-S. Shin, Y.-H. Kim, Evaluating the Impact Load On the Offshore Platform During Float-over Topside Installation, in: The Nineteenth International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers, Osaka, Japan, 2009, pp. 6.
  14. S. Nowak, K.R. Collins, Reliability of Structures, CRC Press, 2012.
  15. Zhao, Z. Qiu, An efficient response surface method and its application to structural reliability and reliability-basedoptimization, Finite Elements in Analysis and Design, 67 (2013) 34-42.
  16. Zhang, C. Jeong, A.v. Spreeken, Floatover Feasibility in Brazilian Sea Water, in: OTC Brazil, Offshore Technology Conference, Rio de Janeiro, Brazil, 2013, pp. 10.
  17. Seij, H. de Groot, State of the Art in Float-Overs, in: Offshore Technology Conference, Offshore Technology Conference, Houston, Texas, U.S.A., 2007, pp. 9.
  18. Liu, H. Li, HIDECK Floatover Technology, in: G. Liu, H. Li (Eds.) Offshore Platform Integration and Floatover Technology, Springer Singapore, Singapore, 2017, pp. 101-114.
  19. Liu, H. Li, UNIDECK and SMARTLEG, in: G. Liu, H. Li (Eds.) Offshore Platform Integration and Floatover Technology, Springer Singapore, Singapore, 2017, pp. 115-129.
  20. Chaitanya, S.B. Nair, Design of Leg Mating Unit for Float-Over Installation of Decks, in, 2013.
  21. E. Cummins, The impulse response function and ship motions, David Taylor Model Basin Washington DC, 1962.
  22. José A. Armesto, R. Guanche, F.d. Jesus, A. Iturrioz, Iñigo J. Losada, Comparative analysis of the methods to compute the radiation term in Cummins’ equation, Journal of Ocean Engineering and Marine Energy, 1(4) (2015) 377-393.
  23. F. Ogilvie, Recent progress toward the understanding and prediction of ship motions, in: Proceedings of the 5th Symposium on Naval Hydrodynamics, Bergen, Norway, 1964.
  24. K. Peter, et al, Numerical Modelling of Installation Aids for Platform Installation, Saipem UK, UK
  25. Kamranzad, A. Etemad-shahidi, V. Chegini, Assessment of wave energy variation in the Persian Gulf, Ocean Engineering, 70 (2013) 72-80.
  26. R.M. (IRM), LEG MATING UNITS, in, Industrial Rubber Moulders (IRM).
  27. J. Blau, Friction Science and Technology, Taylor & Francis, 1995.
  28. Shahzad, A. Kamran, M.Z. Siddiqui, M. Farhan, Mechanical Characterization and FE Modelling of a Hyperelastic Material, Materials Research, 18 (2015) 918-924.
  29. Vanaja, R.H. Shobha Rani, Design of Experiments: Concept and Applications of Plackett Burman Design, Clinical Research and Regulatory Affairs, 24(1) (2007) 1-23.
  30. Antony, 5 - Screening Designs, in: J. Antony (Ed.) Design of Experiments for Engineers and Scientists (Second Edition), Elsevier, Oxford, 2014, pp. 51-62.
  31. L. Plackett, J.P. Burman, The Design of Optimum Multifactorial Experiments, Biometrika, 33(4) (1946) 305-325.
  32. Wang, W. Wan, Experimental design methods for fermentative hydrogen production: A review, International Journal of Hydrogen Energy, 34
  33. L.C. Ferreira, R.E. Bruns, H.S. Ferreira, G.D. Matos, J.M. David, G.C. Brandão, E.G.P. da Silva, L.A. Portugal, P.S. dos Reis, A.S. Souza, W.N.L. dos Santos, Box-Behnken design: An alternative for the optimization of analytical methods, Analytica Chimica Acta, 597(2) (2007) 179-186.
  34. a.K. Taguchi, S., Taguchi Methods Orthogonal Arrays and Linear Graphs: Tools for Quality Engineering, American Supplier Institute, 1987.
  35. Taguchi, Introduction to quality engineering: designing quality into products and processes, 7th Reprint. ed., Tokyo: Asian productivity organization, 1990.
  36. S. Rao, C.G. Kumar, R.S. Prakasham, P.J. Hobbs, The Taguchi methodology as a statistical tool for biotechnological applications: a critical appraisal, Biotechnol J, 3(4) (2008) 510-523.
  37. -Y. Yang, C.-W. Chen, J.-C. Chou, Investigation on the sensitivity of TiO2:Ru pH sensor by Taguchi design of experiment, Solid-State Electronics, 77 (2012) 82-86.
  38. Jurków, J. Stiernstedt, Investigation of High Temperature Co-fired Ceramics sintering conditions using Taguchi Design of the experiment, Ceramics International, 40(7, Part B) (2014) 10447-10455.
  39. H.a.M. Myers, Douglas C., RESPONSE SURFACE METHODOLOGY: Process and Product Optimization Using Designed Experiments, Fourth Edition ed., John Wiley & Sons, Inc., 2016.
  40. Kaya Uyanık, N. Güler, A Study on Multiple Linear Regression Analysis, Procedia - Social and Behavioral Sciences, 106 (2013) 234–240.
  41. Swiler, A. Giunta, Aleatory and epistemic uncertainty quantification for engineering application (2007).
  42. E. Nikolaidis, Ghiocel, D. (Ed.), Singhal, S. (Ed.), Engineering Design Reliability Handbook, CRC Press, 2004.
  43. Am, N. Lind, An Exact and Invariant First Order Reliability Format, Journal of Engineering Mechanics, 100(1974)
  44. Mahsuli, T. Haukaas, Computer Program for Multimodel Reliability and Optimization Analysis, Journal of Computing in Civil Engineering, 27(1) (2013) 87-98.
  45. Chandrasekaran, Srinivasan Chandrasekaran. 2016a. Offshore structural engineering: Reliability and Risk Assessment. CRC Press, Florida, ISBN: 978-14-987-6519-0, 2015.
Amirkabir Journal of Civil Engineering
Volume 53, Issue 11
February 2022
Pages 4989-5008

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