The Paton Welding Journal, 2001, №11

2001 №11 (12)

2001 №11 (02)

---

The Paton Welding Journal, 2001, #11, pages

Mathematical modelling of pitting defects in active oil and gas pipelines and development of a numerical method for estimation of permissible parameters of arc welding repair of defects

V.I. Makhnenko, V.S. But, E.A. Velikoivanenko, G.F. Rozynka, N.I. Pivtorak

E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
The article considers the possibility of welding repair of pitting corrosion defects 12...20 mm in diameter on the outside surface of walls of a main oil pipeline of steel 17G1S without interruption of its operation. Described is the general procedure for selection of parameters of arc welding repair of a defect, which eliminate burn-through and fracture in the welding zone caused by the mechanism of high-temperature plastic instability and cold (hydrogen) cracking.
Keywords: mathematical modelling, thermal-deformation processes, pipeline, pressure, pitting defects, welding repair of defects, plastic instability, microstructural state, cooling time, residual stresses, cold cracks

References

1. API Standard 110-1 (1999) Welding of pipelines and related facilities. Appendix 13. Service Welding. American Petroleum Institute.
2. Burak, Ya.I., Oalyuk, V.Kh., Dzhardzhimanov, A.S. et al. (1981) Development of parameters for welding repair of cavities in active main oil pipelines. In: Transport and Storage of Oil and Oil Products, Issue 1. Moscow.
3. Taliat, V., Zacliaria, T., Wang, X.-L. et al. (1998) Numerical analysis of residual stress distribution in tubes with spiral weld cladding. Welding J., 8, 328 - 335.
4. Isachenko, V.P., Osipov, V.A., Sukhomel, A.S. (1975) Heat transfer. Moscow: Energia.
5. Erokhin, A.A. (1964) Kinetics of metallurgical processes of arc welding. Moscow: Mashinostroyeniye.
6. (1968) Strength, stability and oscillations. Handbook. Ed. by I.A. Birger, Ya.G. Panovko. Moscow: Mashinostroyeniye.
7. Makhnenko, V.I. (1976) Calculation models for investigation of kinetics of welding stresses and strains. Kyiv: Naukova Dumka.
8. Makhnenko, V.I., Velikoivanenko, E.A., Pochinok, V.E. et al. (1999) Numerical methods of the predictions of welding stresses and distortions. Welding and Surfacing Rev., Vol. 13, Part 1. liar wood A.P.
9. Daffy, F., Eiberg, R., MeSey, W. (1972) On behaviour of defects in pressure vessels. In: New methods for estimation of brittle fracture resistance of materials. Moscow: Mir.
10. Sevffarth, P., Meyer, B., Scharff, A. (1992) Grosser Altas Scbwess-ZTU-Schaubilder. Dusseldorf: Dt. Verl. fur Schweisstechnik, DVS-Verl.

---

Suggested Citation

V.I. Makhnenko, V.S. But, E.A. Velikoivanenko, G.F. Rozynka, N.I. Pivtorak (2001) Mathematical modelling of pitting defects in active oil and gas pipelines and development of a numerical method for estimation of permissible parameters of arc welding repair of defects. The Paton Welding J., 11, 2-9.

---