PSI - Issue 17

Garan Martin et al. / Procedia Structural Integrity 17 (2019) 514–519

519

Garan, M.,Šulko, M.: / Structural Integrity Procedia 00 (2019) 000 – 000

6

The steel ageing processes may not always reduce the serviceability of pressured pipes in all operating conditions. They also do not reduce the strength values; they can even increase them, and the pressure resistance of pipeline may not be at risk in this case at all. The low ductility values and especially low notch toughness values endanger the operation of the pipelines. They endanger the operation especially at low temperatures as well as in cases of impact stress or in cases with sharp contact of subsoil (requiring local plastic deformation). The low ductility and notch toughness values mainly endanger steel weldability during maintenance, reparation and replacement of individual pipeline parts without the possibility to enlarge the lifetime (Kliman, 2015, Chmelko, 2018, Kepka 2018).

Acknowledgements

This work was supported by the Slovak Research and Development Agency under the contract No. APVV-17 0666.

References

Chmelko,V., Kliman,V., Garan,M. 2015. In-time monitoring of fatigue damage. Procedia Engineering 101, 93-100 Philip A. Schweitzer, P.E, 2009. Fundamentals of Corrosion: Mechanisms, Causes, and Preventative Methods, CRC Press. Marcus, P. 2017. Corrosion Mechanisms in Theory and Practice, CRC Press. Podhodnya, I.K., Shvachko, V.I., 2001. Natural of Hydrogen Brittleness of Structural Steels Materials Science 37, ANSI/API Specification 5DP Specification for Drill Pipe, ISO 11961:2008 (Identical) Petroleum, petrochemical and natural gas industries — Steel drill pipe First Edition August 2009 Product Number GX5DP01 Kliman, V., Chmelko,V., Margetin,M., 2015. Analysis of the notch effect of welded joint and of grinding effect. Metallic Materials 53, 429-441 Kepka, M., Kepka, M.jr, 2018. Parametric Study of the Potential of Application of High-strength Steels to Increasing the Service Fatigue Life of Vehicle Structures. IOP Conference. Series.: Material Science and Engineering 461, 012037 Chmelko, V., Margetin, M., Harakaľ, M. , 2018. Notch effect of welded joint. MATEC Web of Conferences165, 21003