The influence of operational degradation of material on residual life of oil pipelines

Keywords

oil pipeline, degradation, energy approach, two-frequency loading, crack opening function.

Cite as

Andreikiv O. Ye., Dolinska I. Ya., Liubchak M. O., and Nastasiak S. V. The influence of operational degradation of material on residual life of oil pipelines. Physicochemical Mechanics of Materials. 2023. 59(4), 5-13.

https://doi.org/10.15407/pcmm2023.04.005

Abstract

On the basis of the energy approach previously developed by the authors, the problem of determining the residual life of an oil pipeline pipe with a surface semi-elliptical mic­rocrack, into which the soil corrosive medium penetrates, is solved. A turbulent flow of oil moves along such a pipe, which causes two-frequency loading of its wall. Since micro-de­fects and the plastic material of the pipe, which degrades during crack propagation, are considered, the solution of the problem using the energy approach is reduced to a nonlinear differential equation with respect to the crack opening function near its pre-fracture zone with variable coefficients. The equation together with the initial and final conditions (crack opening on the inner surface of the pipe and its depressurization) is a mathematical model for determining the residual life of the pipe. The crack opening function is found approximately using the method of equivalent stress states and the limit interpolation method developed earlier by the authors. The dependences of the residual life of the oil pipeline pipe made of X70 steel, taking into account the degradation of its material, were obtained.

References

1. A. Ya. Zhdek, and V. Ya. Grudz, “Determination of the residual resource of long-term operated oil pipelines, taking into account existing corrosion defects and operating conditions,” Naukovyi Visnyk of Ivano-Frankivsk Nation. Tech. Univ. of Oil and Gas. [in Ukrainian], 32, No. 2, 134-142 (2012).
2. Ye. I. Krzyzhanivskyi, and H. V. Nykyforchyn, Corrosion-Hydrogen Degradation of Oil and Gas Pipelines and its Prevention [in Ukrainian], in 3 Vol., Ivano- Frankivsk Nation. Tech., Univ. of Oil and Gas, Ivano-Frankivsk (2010-2012).
3. M. Garan, and M. Šulko, “Degradation mechanisms in the operation of pressured pipelines,” Proc. Struct. Integrity, 17, 514-519 (2019). https://doi.org/10.1016/j.prostr.2019.08.068
4. L. Li, C.-Q. Li, M. Mahmoodian, and W. Shi, “Corrosion induced degradation of fatigue strength of steel in service for 128 years,” Structures, 23, 415-424 (2020). https://doi.org/10.1016/j.istruc.2019.11.013
5. O. Tsyrulnyk, Z. Slobodian, M. Hredil, O. Zvirko, and D. Zaverbnyi, “Electrochemical indicators of operational degradation of oil and gas pipeline steels,” Fizyko-Khnimichna Mekhanika Materialiv, Spec. Is. No. 5, 284-289 (2006).
6. H. M. Nykyforchyn, O. T. Tsyrul’nyk, D. Yu. Petryna, and M. Hredil’, “Degradation of steels used in gas main pipelines during their 40-year operation,” Strength of Mater., 41, Is. 5, 501-505 (2009). https://doi.org/10.1007/s11223-009-9158-8
7. E. Ohaeri, U. Eduok, and J. Szpunar, “Hydrogen related degradation in pipeline steel: A review,” Int. J. of Hydrogen Energy, 43, Is. 31, 14584-14617 (2018). https://doi.org/10.1016/j.ijhydene.2018.06.064
8. P. A. Yagoda, D. D. Tymkiv, and V.D. Tymkiv, “A model of a virtual simulator for liquidation of emergency situations on the linear part of MG and CS,” Naftova i Gazova Promyskovist [in Ukrainian], Is. 1, 52-54 (2006).
9. A. V. Andrusiak, “Analysis and causes of oil pipeline failures and factors affecting their operation,” Rozvidka ta Obrobka Naftovykh i Gazovykh Rodovyshch [in Ukrainian], Is. 4, 83-845 (2008).
10. V. V. Panasyuk, Strength and Fracture of Solids with Cracks [in Ukrainian], Karpenko Physico-Mechanical Institute, Lviv (2002).
11. O. V. Hembara, and O. E. Andreikiv, “Effect of hydrogenation of the walls of oil-and-gas pipelines on their soil corrosion and service life,” Mater. Sci., 47, No. 5, 598-607 (2012). https://doi.org/10.1007/s11003-012-9433-x
12. M. Wasim, and M. B. Djukic, “External corrosion of oil and gas pipelines: A review of failure mechanisms and predictive preventions,” J. Natural Gas Sci. and Eng., 100, art. no. 104467 (2002). https://doi.org/10.1016/j.jngse.2022.104467
13. H. Niazi, R. Eadie, W. Chen, and H. Zhang, “High pH stress corrosion cracking initiation and crack evolution in buried steel pipelines: A review,” Eng. Fail. Analysis, 120, art. no. 105013 (2021). https://doi.org/10.1016/j.engfailanal.2020.105013
14. I. M. Dmytrakh, R. L. Leshchak, and A. M. Syrotyuk, “Influence of sodium nitrite concentration in aqueous corrosion solution on fatigue crack growth in carbon pipeline steel,” Int. J. of Fatigue, 128, art. no. 105192 (2019). https://doi.org/10.1016/j.ijfatigue.2019.105192
15. O. E. Andreikiv, Ya. L. Ivanyts’kyi, Z. O. Terlets’ka, and M. B. Kit, “Evaluation of the durability of a pipe of oil pipeline with surface crack under biaxial block loading,” Mater. Sci., 40, No. 3, 408-415 (2004). https://doi.org/10.1007/s11003-005-0010-4
16. O. E. Andreikiv, V. R. Skal’s’kyi, V. K. Opanasovych, I. Ya. Dolins’ka, and I. P. Shtoiko, “Determination of the period of subcritical growth of creep-fatigue cracks under block loading,” J. Math. Sci., 222, Is. 2, 103-113 (2017). https://doi.org/10.1007/s10958-017-3285-8
17. O. Ye. Andreikiv, I. Ya. Dolins’ka, A. R. Lysyk, and N. B. Sas, “Mathematical modeling of fracture processes in plates with systems of cracks under the action of long-term loads, high temperatures, and corrosive media,” J. Math. Sci., 236, Is. 2, 212-223 (2019). https://doi.org/10.1007/s10958-018-4107-3
18. N. Yadzhak, “Generalization of the equivalent area method for the case of short fatigue cracks in a three-dimensional body,” Visnyk of Ivan Franko Lviv University. Ser. Mech. and Mat., Is. 89, 134-141 (2020). https://doi.org/10.30970/vmm.2020.89.106-122
19. N. S. Shtayura, “Determination of residual strength of thin-walled structural elements with short cracks,” Naukovi Notatky, 57, 187-189 (2017).
20. O. E. Andreikiv, O. V. Hembara, O. T. Tsyrul’nyk, and L. I. Nyrkova, “Evaluation of the residual lifetime of a section of a main gas pipeline after long-term operation,” Mater. Sci., 48, No. 2, 231-238 (2012). https://doi.org/10.1007/s11003-012-9497-7