The Paton Welding Journal, 2024, №09



2024 №09 (05)

DOI of Article 10.37434/tpwj2024.09.06

2024 №09 (01)

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The Paton Welding Journal, 2024, #9, 44-49 pages

Reinforcement of an NPP pipeline with a wall thinning defect by applying external weld overlay

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

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

Abstract
Repair of NPP pipelines with erosive and corrosive wear defects is an urgent problem of the nuclear power industry of Ukraine. When repairing the pipeline, the defective section is cut out and a new pipe coil is installed by welding. However, for a large number of technological pipelines with identified isolated defects, inadmissible wall thinning, replacement of a pipe section is associated with a large volume of repair work. To extend the service life, the defective section of the pipeline can be reinforced, for example, by welding an external overlay, weld deposition, installing a bandage or a welded sleeve. In order to justify the expediency of using reinforcing structures of welded external overlay type at pipeline repair, a finite element analysis of the stress-strain state of a straight section of the pipeline with an erosion-corrosion wear defect under the action of internal pressure before and after repair was carried out. The results of the analysis showed a high efficiency of reinforcement the defective section of the pipeline in the case of using a welded external overlay at repair. The obtained results can be used at justifying the introduction of alternative pipeline repair technologies at NPPs of Ukraine.
Keywords: NPP, pipeline, erosion-corrosion wear, wall thinning defect, reinforcing structure, welded external overlay, stress-strain state, ductile fracture, finite element method

Received: 23.04.2024
Received in revised form: 10.06.2024
Accepted: 03.09.2024

References

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Suggested Citation

G.V. Vorona, O.S. Kostenevych, O.S. Milenin, O.V. Makhnenko (2024) Reinforcement of an NPP pipeline with a wall thinning defect by applying external weld overlay. The Paton Welding J., 09, 44-49.

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