PSI - Issue 33

Pavel Žlábek et al. / Procedia Structural Integrity 33 (2021) 1007 – 1012 Žlábek et al./ Structural Integrity Procedia 00 (2021) 000–000

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 at the same value of internal pressure, the weld of material X52 has sufficient fatigue strength up to a diameter of 700 mm. Pipe diameters above 700 mm require a material with a higher level of cyclic properties, e.g. X60 or X70  the critical point of the welded joint is the heat affected zone at the point of elevation from the weld root at the inner surface due to the notch effect and the deteriorated internal structure of the material (Kliman 2015). Acknowledgements This work was supported by the Slovak Research and Development Agency under the contract No. APVV-17 0666 and by the Research & Development Operational Programme funded by the ERDF ITMS: 26240220084 Science city Bratislava. References Restrepo, C.E., Simono, J.S., Zimmerman, R., 2001. Causes, cost consequences, and risk implications of accidents in US hazardous liquid pipeline infrastructure. Int. J. Crit. Infrastruct. Prot., 2, 38–50. Nanney, S., 2012. Pipeline Safety Update. NAPCA Workshop, Texas Wachal, J.C., Smith, D.R., 1991. Vibration Troubleshooting of Existing Piping Systems; EDI Paper No.59; Engineering Dynamics Inc.: San Antonio, TX, USA Radavich, P.M., Selamet, A., Novak, J.M., 2001. A Computational Approach for Flow-acoustic Coupling in Closed Side Branches. J. Acoust. Soc. Am., 109, 1343–1353. Chmelko, V, Kliman, V, Garan, M., 2015. In-time monitoring of fatigue damage. Procedia Eng., 101, 93-100. Chmelko, V., Garan, M., Šulko, M., Gašparík, M. 2020. Health and Structural Integrity of Monitoring Systems: The Case Study of Pressurized Pipelines. Appl. Sci., 10, 6023 Glisic, B. Comparative study of distributed sensors for strain monitoring of pipelines. Geotech. Eng. 2019, 50, 28–35. Chmelko, V, Garan, M., 2016. Long-term monitoring of strains in a real operation of structures. In: 14th IMEKO TC10 Workshop Technical Diagnostics New Perspectives in Measurements, Tools and Techniques for system’s reliability, maintainability and safety, Milan, Italy, p. 333–336. Chmelko, V., Garan, M., Šulko, M. 2020. Strain measurement on pipelines for long-term monitoring of structural integrity. Measurement, 163, 107863 Basquin, O. H.: Proceedings ASTM, 10, 1910, p. 625 Pereira, J.C.R., de Jesus, A.M.P., Xavier, J., Correia, J.A.F.O., Susmel, L, Fernandes, A.A. 2020. Low and ultra-low-cycle fatigue behavior of X52 piping steel based on theory of critical distances. Int J Fatigue, 134, 105482 Chmelko V, 2014. Cyclic anelasticity of metals., Kov. Mater 52, 353–359. Kliman, V., Chmelko, V., Margetin, M., 2015. Analysis of the notch effect of welded joint and of grinding effect, Kov. Mater. 53, 429-441.