Seismic Analysis of Double Deck Floating Roofs of Siraf Storage Tanks with Condensate, Light and Heavy Crude Oils

Document Type : Original Article

Authors

1 International College, Shiraz University, Shiraz, Iran

2 School of Mechanical Engineering, Shiraz University, Shiraz, Iran

Abstract

Seismic vibration of double deck floating roof of Siraf storage tanks located in southern Iran has been studied. Condensate of Nar and Kagan gas field in south of Iran as a very light hydrocarbon, Lavan as light and Soroosh as heavy crude oil content have been chosen. In addition to fluid-structure interaction, intermediate stiffeners, foam seal with nonlinear radial compression behavior and contact friction between the seal and the inner side of the wall are also considered. Under the above conditions, modal and time history analysis has been performed. For time history analysis, Sarpol-e Zahab and Shonbeh earthquakes in Zagros seismotectonic province of Iran and Sakaria as an earthquake near Iran were selected. Dominant natural frequencies, mode shapes of the roof parts and damping ratios of the first and second natural frequencies in addition to overall and spectral behavior of the roof in each liquid cases were obtained and discussed. Changing condensate to Soroosh oil made about 17% hydroelastic natural frequency decrement and about 10% damping ratio decrease for the first natural frequency. The results showed that dominant natural frequencies and the relevant damping ratios decrease with moving from light to heavy liquid. Vibration of the roof fundamentally depends on the frequency content of earthquake in relation to such natural frequencies. Also, floating roof in heavier liquid is more vulnerable to vibration according to the scaling method and steady state amplitude.

Keywords


  1. Kuan, S.Y., "Design, construction and operation of the floating roof tank", University of Southern Queensland, Mechanical and Mechatronic Engineering, Australia, Bachelor of Engineering, (2009).
  2. Trimulyono, A., Chrismianto, D., Samuel, S. and Aslami, M.H., "Single-phase and two-phase smoothed particle hydrodynamics for sloshing in the low filling ratio of the prismatic tank", International Journal of Engineering, Transactions B: Applications, Vol. 34, No. 5, (2021), 1345-1351., DOI: 10.5829/IJE.2021.34.05B.30
  3. Hatayama, K., "Lessons from the 2003 tokachi-oki, japan, earthquake for prediction of long-period strong ground motions and sloshing damage to oil storage tanks", Journal of Seismology, Vol. 12, No. 2, (2008), 255-263., DOI: 10.1007/s10950-007-9066-y
  4. Manser, W.S., Touati, M. and Barros, R.C., "The maximum sloshing wave height evaluation in cylindrical metallic tanks by numerical means", MATEC Web Conference., Vol. 95, (2017), 17005., https://doi.org/10.1051/matecconf/20179517005
  5. Utsumi, M., "Vibration reduction of a floating roof by dynamic vibration absorbers", Journal of Pressure Vessel Technology, Vol. 133, No. 4, (2011)., DOI: 10.1115/1.4002923
  6. Kobayashi, N., Sato, T. and Torisaka, A., "Passive control of liquid sloshing in floating roof tank with multi dynamic absorber", in ASME 2013 Pressure Vessels and Piping Conference. Vol. Volume 8: Seismic Engineering, No. Issue, (2013)., DOI: 10.1115/pvp2013-97229
  7. Hasheminejad, S.M. and Mohammadi, M.M., "Active sloshing control in a smart flexible cylindrical floating roof tank", Journal of Fluids and Structures, Vol. 66, (2016), 350-381., https://doi.org/10.1016/j.jfluidstructs.2016.07.022
  8. Esfandian, H., Goodarzian Urimi, M. and Shokoohi Rad, A., "Risk assessment of gasoline storage unit of national iranian oil product distribution company using phast software", International Journal of Engineering, Transactions A: Basics, Vol. 34, No. 4, (2021), 763-768., DOI: 10.5829/IJE.2021.34.04A.02
  9. Amabili, M., "Vibrations of circular plates resting on a sloshing liquid: Solution of the fully coupled problem", Journal of Sound and Vibration, Vol. 245, No. 2, (2001), 261-283., https://doi.org/10.1006/jsvi.2000.3560
  10. Golzar, F.G., Shabani, R., Tariverdilo, S. and Rezazadeh, G., "Sloshing response of floating roofed liquid storage tanks subjected to earthquakes of different types", Journal of Pressure Vessel Technology, Vol. 134, No. 5, (2012)., DOI: 10.1115/1.4006858
  11. Golzar, F.G., Shabani, R. and Tariverdilo, S., "Stress analyses in single deck and double deck floating roofs subjected to earthquake ground motions", Scientia Iranica, Vol. 24, No. 2, (2017), 727-739., DOI: 10.24200/sci.2017.4057
  12. Matsui, T., "Sloshing in a cylindrical liquid storage tank with a single-deck type floating roof under seismic excitation", Journal of Pressure Vessel Technology, Vol. 131, No. 2, (2009)., DOI: 10.1115/1.3062939
  13. Salarieh, H., shabani, r. and tariverdilo, s., "Effect of flexural and membrane stiffness on the analysis of floating roofs", International Journal of Engineering, Transactions A: Basics, Vol. 23, No. 1, (2010), 57-64., http://www.ije.ir/article_71832_fcf49782751cad16e30f173312ef4676.pdf
  14. Yamauchi, Y., Kamei, A., Zama, S. and Uchida, Y., "Seismic design of floating roof of oil storage tanks under liquid sloshing", in ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Vol. Volume 4: Fluid Structure Interaction, Parts A and B, (2006), 1407-1415., DOI: 10.1115/pvp2006-icpvt-11-93280
  15. Sakai, F., Inoue, R. and Hayashi, S., "Fluid-elastic analysis and design of sloshing in floating-roof tanks subjected to earthquake motions", in ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Vol. Volume 4: Fluid Structure Interaction, Parts A and B, (2006), 1437-1446., DOI: 10.1115/pvp2006-icpvt-11-93622
  16. Sakai F., I.R., "Some considerations on seismic design and controls of sloshing in floating-roofed oil tanks", in The 14th World Conference on Earthquake Engineering, Beijing, China. (2008).
  17. Yoshida, S., Sekine, K. and Iwata, K., "Sloshing characteristics of single deck floating roofs in aboveground storage tanks: Natural periods and vibration modes", in ASME 2009 Pressure Vessels and Piping Conference. Vol. Volume 7: Operations, Applications and Components, (2009), 191-199., DOI: 10.1115/pvp2009-77187
  18. Yoshida, S., Sekine, K. and Mitsuta, T., "Axisymmetric finite element analysis for sloshing response of floating roofs in cylindrical storage tanks", Journal of Environment and Engineering, Vol. 5, No. 1, (2010), 27-38., DOI: 10.1299/jee.5.27
  19. Utsumi, M., Ishida, K. and Hizume, M., "Internal resonance of a floating roof subjected to nonlinear sloshing", Journal of Applied Mechanics, Vol. 77, No. 1, (2009)., DOI: 10.1115/1.3173768
  20. Goudarzi, M.A., "Seismic behavior of a single deck floating roof due to second sloshing mode", Journal of Pressure Vessel Technology, Vol. 135, No. 1, (2012)., DOI: 10.1115/1.4007291
  21. Goudarzi, M.A., "Seismic design of a double deck floating roof type used for liquid storage tanks", Journal of Pressure Vessel Technology, Vol. 137, No. 4, (2015)., DOI: 10.1115/1.4029111
  22. Meera, U.S. and Reshmi, P.R., "Dynamic analysis of single deck floating roof with deck stiffeners", International Research Journal of Engineering and Technology, Vol. 04, No. 04, (2017), 3522-3526., https://www.irjet.net/archives/V4/i4/IRJET-V4I4844.pdf
  23. Hosseini, M., Soroor, A., Sardar, A. and Jafarieh, F., "A simplified method for seismic analysis of tanks with floating roof by using finite element method: Case study of kharg (southern iran) island tanks", Procedia Engineering, Vol. 14, (2011), 2884-2890., https://doi.org/10.1016/j.proeng.2011.07.363
  24. Belostotsky, A.M., Akimov, P.A. and Afansyeva, I.N., "Multilevel methodology of numerical seismic analysis of coupled systems “foundation – shell – pontoon (floating roof) –column(s) – fluid”", Procedia Engineering, Vol. 153, (2016), 89-94., https://doi.org/10.1016/j.proeng.2016.08.085
  25. Gnitko, V., Degtyariov, K., Naumenko, V. and Strelnikova, E., "Bem and fem analysis of the fluid-structure interaction in tanks with baffles", International Journal of Computational Methods and Experimental Measurements, Vol. 5, No. 3, (2017), 317-328., DOI: 10.2495/CMEM-V5-N3-317-328
  26. Shabani, R. and Golzar, F.G., "Large deflection analysis of floating roofs subjected to earthquake ground motions", Nonlinear Analysis: Real World Applications, Vol. 13, No. 5, (2012), 2034-2048., https://doi.org/10.1016/j.nonrwa.2011.12.026
  27. Sivy M., M.M., Chlebo O., Havelka R., "Sloshing effects in tanks containing liquid", in MATEC Web of Conferences, Bratislava, Slovakia. Vol. 107, (2017), 7., https://doi.org/10.1051/matecconf/201710700069
  28. Shabani, R., "Stress patterns in single deck floating roofs subjected to ground motion accelerations", International Journal of Engineering, Transactions C: Aspects, Vol. 26, No. 12, (2013), 1495-1504., DOI: 10.5829/idosi.ije.2013.26.12c.10
  29. Yazdani, A.-. and Kowsari, M., "Statistical prediction of the sequence of large earthquakes in iran", International Journal of Engineering, Transactions B: Applications, Vol. 24, No. 4, (2011), 325-336., DOI: 10.5829/idosi.ije.2011.24.04b.03
  30. Chopra, A.K., "Dynamics of structures: Theory and applications to earthquake engineering", Fourth Edition ed, Berkeley, Prentice Hall, (2012)
  31. ANSYS.Inc. Customer support | ansys. 26 August 2021]; Available from: https://www.ansys.com/support.,
  32. NIOC, R.I.P.I. Petroleum products specifications. 26 August 2021]; Available from: https://www.nioc-intl.com/EN/PetroleumSpec.aspx
  33. Tank technology engineering service co. Ateco: External floating roof seals. 26 August 2021]; Available from: https://www.atecotank.com/floating-roof-seal/external-floating-roof-seals/
  34. Alzoubi, M., Al-Waked, R. and Tanbour, E., "Compression and hysteresis curves of nonlinear polyurethane foams under different densities, strain rates and different environmental conditions", Journal of Mechanical Engineering, Vol. 9, (2011), 101-109., doi: 10.1115/IMECE2011-62290
  35. Thomson, W.T. and Dahleh, M.D., "Theory of vibration with applications, India, Pearson, (1997),  544.
  36. Moslemi, M. and Kianoush, M.R., "Parametric study on dynamic behavior of cylindrical ground-supported tanks", Engineering Structures, Vol. 42, (2012), 214-230., https://doi.org/10.1016/j.engstruct.2012.04.026
  37. Yenduri, A., Ghoshal, R. and Jaiman, R.K., "A new partitioned staggered scheme for flexible multibody interactions with strong inertial effects", Computer Methods in Applied Mechanics and Engineering, Vol. 315, No., (2017), 316-347., https://doi.org/10.1016/j.cma.2016.10.044
  38. Sivý, M. and Musil, M., "Seismic resistance of storage tanks containing liquid in accordance with principles of eurocode 8 standard", Strojnícky Ĩasopis - Journal of Mechanical Engineering, Vol. 66, No. 2, (2016), 79-88., doi:10.1515/scjme-2016-0021
  39. Norouzi, A.H., Gerami, M., Vahdani, R. and Sivandi-Pour, A., "Effects of multiple structure-soil-structure interactions considering the earthquake waveform and structures elevation effects", International Journal of Engineering, Transactions B: Applications, Vol. 33, No. 5, (2020), 744-752., doi: 10.5829/ije.2020.33.05b.05
  40. Seismosoft.Co. Seismosignal support. 26 August 2021]; Available from: https://seismosoft.com/support/seismosignal-support/
  41. Iran road, housing & urban development research center: Iran strong motion network. 22 August 2021]; Available from: https://smd.bhrc.ac.ir/Portal/en/Search/BigQuakes
  42. Standardization, E.C., Eurocode 8- design of structures for earthquake resistance- part 4: Silos, tanks and pipelines, in Specific principles and application rules for tanks. 2006, European Committee for Standardization: Brussels.81.