Increasing corrosion and mechanical resistance destruction  of welding cover capacities water towers

Makarenko, Valery; Bilyk, Serhii; Khomutetska, Tetіana; Arhatenko, Tetiana; Makarenko, Yulia; Panchenko, Olena S.

doi:10.32347/2524-0021.2022.39.33-43

Cited by 2 publications

(4 citation statements)

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“…Thus, investigations of the endurance of pipe steels in a complex stressed state show that static torsional stresses close to the yield point do not lower the fatigue life at testing in air. Although the corrosive environment significantly decreases the steel cyclic strength at tangential stresses of up to τcr=0.5τY, the conditional corrosion fatigue limit is not lower than at corrosion fatigue testing under the impact of just the alternating bending stresses in a symmetrical cycle, considering that the torsional stresses in the pipeline system are equal to 10 MPa [4], so that their influence on the endurance of pipes of underground pipeline systems can be neglected in practical calculations.…”

Section: Figures 2-5 Show the Results Of Endurance And Corrosion Fati...mentioning

confidence: 99%

“…Objective of the work is experimental studies of the influence of temperature and operational period on the endurance of steel underground pipelines which have operated for an extended period of time, in a corrosive-aggressive environment under the impact of alternating loads in a broad temperature range. An a.c. asynchronous motor 10 is installed on the frame-plate of IK-5 machine [4]. The motor shaft is co-axially connected by an elastic coupling 9 to the spindle of drive drum 8.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature and Long-Term Operation on Metal Durability of Pipelines of Hydrotechnical Structures

Maksimov,

Makarenko,

Tkachenko

et al. 2023

KEM

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The paper considers the issue of the influence of ambient temperature and service life on the endurance of pipe steels of underground pipelines. The results of numerous experimental studies allowed us to draw the following conclusions. An analysis of the experimental data indicates that for all the studied steels, the endurance decreases with decreasing air temperature, mainly down to-20... -30 °C. This can be explained by the embrittlement of the metal, i.e. a decrease in the plastic properties of the pipeline metal structure. In addition, it can be seen from the given data that low-alloy steels 48KhN, 09G2S, 10GS have the highest endurance. Weak endurance is mainly typical of grade 20 carbon steel. Experimental studies show that with an increase in the service life of pipes, their endurance decreases, and this tendency is inherent in all the studied steels. Studies of the endurance of pipe steels under complex stress states show that static torsional stresses close to the yield strength, when tested in the air, do not reduce fatigue life. Although the corrosive environment significantly reduces the cyclic strength of steel under shear stresses up to τcr=05τY, the conditional limit of corrosion fatigue is not lower than when tested for corrosion fatigue under the action of only alternating stresses in a symmetrical cycle. It could be considered that the torsional stress in the pipeline system does not exceed 10 MPa. In that case, their influence on practical calculations on the endurance of pipes of underground pipeline systems can be neglected.

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Section: Figures 2-5 Show the Results Of Endurance And Corrosion Fati...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Temperature and Long-Term Operation on Metal Durability of Pipelines of Hydrotechnical Structures

Maksimov,

Makarenko,

Tkachenko

et al. 2023

KEM

View full text Add to dashboard Cite

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“…Особливо найбільш чутливі зміни відбуваються в зоні термічного впливу, що пояснюється наявністю в них структурно-неоднорідних областей (рис. 5) [15][16][17][18]. Тому, як правило, руйнування трубопроводів проходить або по зварному шву, або по ЗТВ.…”

Section: вступunclassified

“…Дослідження зразків зварних труб із вуглецевої сталі марки 20 дозволили підтвердити більш значне окрихчення зварного з'єднання, ніж тіла труби в процесі довготривалої експлуатації трубопроводів на комунальних підприємствах України (рис. 6) [18]. Як видно з даних рис.…”

Section: рис 2 мікроструктура метала в різних зонах зварювального з'є...unclassified

Research of accidents pipelines

Makarenko¹,

Gots²,

Makarenko³

et al. 2022

PWSH

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The durability and reliability of operation of steel pipelines of water supply and sewage systems is determined in particular by the quality of their welded joints, which in turn depends both on the composition of the materials used in their manufacture and on the observance of welding technology. The composition of impurities of transported liquids, which can cause corrosive destruction of materials, also has a significant impact on the reliability of pipeline systems. These phenomena are especially important in hot water supply and industrial drainage systems, where the destructive influence of physical factors and the chemical composition of the environment can be decisive. It was found that the loss of strength of the pipeline is caused in particular by improper operation, under the conditions of which micro-flaws of welded joints of pipelines appear, which leads to their destruction. The results of examinations and experimental studies of the strength of welds of steel process pipelines are presented. An external inspection was carried out, determination of the structure and strength parameters of pipeline welds, layer-by-layer analysis of corrosion damage on their inner surface. It was found that premature destruction of welded joints of hot water supply pipelines and industrial sewage is caused by long-term operation in a stressed state. Under such circumstances, the uneven coarse-grained structure of the seam, the presence of non-metallic inclusions in the metal structure, and violations of the welding technology had a critical impact on the loss of strength. In order to increase the corrosion-mechanical resistance of welded joints of industrial pipelines, it is necessary to modify the surfacing metal of the weld to break down the structure and significantly reduce non-metallic inclusions, as well as to improve the technology of manual arc welding with coated electrodes, in particular, the root layers of welding seams.

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Increasing corrosion and mechanical resistance destruction of welding cover capacities water towers

Cited by 2 publications

References 0 publications

Influence of Temperature and Long-Term Operation on Metal Durability of Pipelines of Hydrotechnical Structures

Influence of Temperature and Long-Term Operation on Metal Durability of Pipelines of Hydrotechnical Structures

Research of accidents pipelines

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