Failure analysis of the material of water boiler pipe operated in the Arctic zone of the Republic of Sakha (Yakutia)
https://doi.org/10.31242/2618-9712-2020-25-3-14
Abstract
The failure of the air-introducing pipe of water boiler in an Arctic settlement of the Republic of Sakha (Yakutia) was studied. The operation mode was studied, and the samples of the destroyed pipe material were investigated by means of optical and electron scanning microscopy. Metal composition was determined, and mechanical characteristics were evaluated. Microstructure analysis initially pointed to a strong thermal overheating of the pipe material, however, more than twofold thinning of the pipe wall and the presence of flaws that were repaired by manual arc welding several times later on proved the corrosion nature of destruction. Calculation revealed that the dew point was reached and moisture was condensed on the pipe as a concequence of specific low-temperature regime within a large range of air humidity during the operation of the boiler. Thus, it is necessary to change the design of the boiler or the pipe material because the existing version does not suite the extremal performance conditions, since the low a,bient temperature causes intensification of heat exchange, a decrease in the temperature of stack effluent, condensation of moisture and corrosion of the pipe metal.
Keywords
pipe steel,
thermal overheating,
microstructure,
electron microscopy,
microhardness,
spectral analysis,
corrosion,
dew point,
fracture
Supporting agencies: The reported study was partially funded by RFBR, project number 18-48-140015, in theoretical and scanning microscopy research, and by Ministry of Science and Education of Russian Federation, Project III.28.1.1 in the frames of Program for Basic Research of the Siberian Branch of Russian Academy of sciences, in experimental spectral analysis, optical metallography and microhardness study. Also the research was done using equipment of the Shared core facilities of the Federal Research Center of the Yakutsk Science Center of the Siberian Branch of the Russian Academy of Sciences.
About the Authors
V. V. Lepov
Larionov Institute of the physical-technical problems of the North SB RAS
Russian Federation
Russian Federation
LEPOV Valeriy Valerievich, doctor of technical sciences, director
1 Oktyabrskaya str., Yakutsk 677980
V. S. Achikasova
Larionov Institute of the physical-technical problems of the North SB RAS
Russian Federation
Russian Federation
ACHIKASOVA Valentina Semenovna, engineer
1 Oktyabrskaya str., Yakutsk 677980
S. N. Makharova
Larionov Institute of the physical-technical problems of the North SB RAS
Russian Federation
Russian Federation
MAKHAROVA Susanna Nikolaevna, candidate of technical science, leading researcher
1 Oktyabrskaya str., Yakutsk 677980
V. E. Zakharov
Larionov Institute of the physical-technical problems of the North SB RAS
Russian Federation
Russian Federation
ZAKHAROV Vasilii Egorovich, researcher
1 Oktyabrskaya str., Yakutsk 677980
N. V. Pavlov
Larionov Institute of the physical-technical problems of the North SB RAS
Russian Federation
Russian Federation
PAVLOV Nikita Vladimirovich, head of the department of energetics problems
1 Oktyabrskaya str., Yakutsk 677980
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Review
For citations:
Lepov V.V., Achikasova V.S., Makharova S.N., Zakharov V.E., Pavlov N.V. Failure analysis of the material of water boiler pipe operated in the Arctic zone of the Republic of Sakha (Yakutia). Arctic and Subarctic Natural Resources. 2020;25(3):143-151. (In Russ.) https://doi.org/10.31242/2618-9712-2020-25-3-14
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