The Paton Welding Journal, 2024, №02



2024 №02 (05)

DOI of Article 10.37434/tpwj2024.02.06

2024 №02 (07)

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The Paton Welding Journal, 2024, #2, 33-40 pages

Effectiveness of unloading a section of NPS pipeline with a pipe wall thinning defect by mounting a band or welded sleeve

G.V. Vorona, O.V. Makhnenko, O.S. Milenin

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Formation of erosion-corrosion wear defects in NPS pipelines is one of the urgent problems of nuclear power engineering. At pipeline repair the defective section is cut out and a new pipe spool is mounted using welding, which is a rather labour-consuming process, and requires draining of the transported liquid. To prolong the service life, the defective pipeline section can be reinforced by mounting a repair structure, for instance a band or welded sleeve. In order to substantiate the rationality of application of reinforcing structures in pipeline repair, finite element analysis of the stress-strain state of the rectilinear pipeline section with a defect of erosion-corrosion wear under the impact of internal pressure was performed, as well as evaluation of the effectiveness of unloading the defective section in the case of application of a reinforcing structure of the type of a band or welded sleeve in repair. Analysis results showed the high effectiveness of application of such structures. Obtained results can be used in substantiation of introduction in the Ukrainian NPS of alternative technologies of repair of pipelines, predominantly technological ones, particularly in those cases when repair by traditional methods is not possible or rational for technical or economic reasons. 18 Ref., 2 Tabl., 9 Fig.
Keywords: NPS, pipeline, erosion-corrosion wear, wall thinning defect, reinforcing structure, band, sleeve, stress-strain state, ductile fracture, finite element method

Received: 02.10.2023
Received in revised form: 11.12.2023
Accepted: 30.01.2024

References

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