Strain Analysis of Oil and Gas Pipeline with Dents Based on ILI Data

Abstract:

Dents in an oil and gas pipeline can be detected by In-line-Inspection (ILI), and structure integrity analysis of the pipe with theses reported dents is important for the safe operation. Strain analysis of the dented pipe is a way of fine assessment and ASME B31.8 has established the strain assessment code and its acceptable range. However, the method of strain assessment is rarely used due to the difficulty of strain calculation for a buried pipe. In this study, features of ILI data are investigated to elaborate the necessary of filtering analysis for strain analysis of the dent with ILI data. Then typical filtering methods are used to smooth the ILI data, and strain analysis are carried out with the smoothed data to study the practicability of strain assessment. Profile and strain of a dent in D813 pipe were obtained by Finite Element Method (FEM). Then different filtering methods were used to smooth the simulated ILI data of the dent which were selected from FEM profile. Strain of the dent were also calculated by smoothed data with the latest ASME B31.8 code, and compared with it from FEM at last to prove the feasibility and validity of the filtering methods with ASME B31.8 code.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 372-376
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.372
• Online since: September 2016
• Authors: Zheng Qiang Lei*, Jian Chen, Fu Xiang Wang, Ting Wang, Li Jian Zhou
• Keywords: Dent, In-Line Inspection (ILI), Integrity, Pipeline, Strain

References

[1] D.B. Noronha, , R.R. Martins, B.P. Jacob, E.D. Souza, Procedures for the strain based assessment of pipeline dents, Int. J. Pres. Ves. Pip. 87 (2010) 254-265.

DOI: 10.1016/j.ijpvp.2010.03.001

[2] K. Tinacos, P. Cazenave, G. Ming, R. Krishnamurthy, S. Dan, C. Jones, ILI based dent screening and strain based analysis, 2012 9th Int. Pip. Conf., American Society of Mechanical Engineers (2012) 727-734.

DOI: 10.1115/ipc2012-90484

[3] Q. Yang, J Shuai, Engineering evaluation method for dented pipeline, Acta. Petrolei. Sinica. 31(2010) 649-653.

[4] ASME B31. 8-2012 Gas transmission and distribution piping systems, New York: The American Society of Mechanical Engineers, (2012).

[5] S.A. Lukasiewicz, J.A. Czyz, C. Sun, S. Adeeb, Calculation of strain in dents based on high resolution in-line caliper survey. Proceedings of the sixth international pipeline conference, ASME, paper IPC2006-10101, Calgary, Alberta, Canada, (2006).

DOI: 10.1115/ipc2006-10101