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[45164] Artykuł: Analysis of the integrity of welded pipes of gas mains by the FITNET proceduresCzasopismo: Materials Science Tom: 45, Zeszyt: 6, Strony: 817-825ISSN: 1068-820X Opublikowano: 2009 Autorzy / Redaktorzy / Twórcy
Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 10 Klasyfikacja Web of Science: Article ![]() ![]() ![]() ![]() Keywords: assessment of integrity  FITNET procedure  welded joint of pipe  gas main  operational degradation  |
We have evaluated the integrity of a rectilinear element of a welded pipe of a gas main after its operation for 40 years with the use of the FITNET procedures according to the Failure-Assessment-Diagram approach. We have determined the critical sizes of defects in the base (17G1S steel) and weld metal of a longitudinal welded joint of a reserve pipe. Two levels of the gas pressure in the pipeline (4.5 and 7.0 MPa) are taken as critical values. It has been shown that, in the absence of corrosion and hydrogenating influence of the transported medium, the base metal of pipes both in as-received state and after long-term operation is more susceptible to fracture due to reaching the critical stressed state than the weld metal.