Analysis of the causes of fracture of the main gas pipeline
A complex of research has been conducted to establish the causes of the accident of the main gas pipeline made of 1420x15.7 mm X70 steel after 20 years of operation. It is found that pipe destruction was initiated by the longitudinal crack with a length of 470 mm and a maximum depth of 6.8 mm, orien...
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| Language: | English |
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Engineering Society for Corrosion, Belgrade
2023-06-01
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| Series: | Zaštita Materijala |
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| Online Access: | https://www.zastita-materijala.org/index.php/home/article/view/100 |
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| author | Lyudmila Nyrkova Anatolii Rybakov Larysa Goncharenko Svetlana Osadchuk Yulia Kharchenko |
| author_facet | Lyudmila Nyrkova Anatolii Rybakov Larysa Goncharenko Svetlana Osadchuk Yulia Kharchenko |
| author_sort | Lyudmila Nyrkova |
| collection | DOAJ |
| description | A complex of research has been conducted to establish the causes of the accident of the main gas pipeline made of 1420x15.7 mm X70 steel after 20 years of operation. It is found that pipe destruction was initiated by the longitudinal crack with a length of 470 mm and a maximum depth of 6.8 mm, oriented in the direction of the pipe and perpendicular to the outer surface of the pipe identified as stress-corrosion cracking. The crack initiation is due to the disboundment of the tape protection coating, the high corrosion activity of the soil, and the complex stress-strain state caused by deviations from the design objectives during construction. The chemical composition the base metal of all investigated pipes corresponds to the requirements of the technical conditions for steel pipes in category X70; pipes welding are performed with the typical materials used in pipe welding plants. Despite the differences, the structural and mechanical characteristics (yield strength, ultimate strength, and impact strength) of the steel and weld metal of the studied pipes are identical. The relative elongation (d5) of the operated pipes is below the normalized values, but, it is necessary to take into account the possibility of deviations in these characteristics of steel in the initial state. Significant reserves of toughness indirectly indicate low damage of metal and, accordingly, satisfactory resistance to destruction of the metal of the studied pipes. |
| format | Article |
| id | doaj-art-0a6a182f96d64cb399a754556876a117 |
| institution | DOAJ |
| issn | 0351-9465 2466-2585 |
| language | English |
| publishDate | 2023-06-01 |
| publisher | Engineering Society for Corrosion, Belgrade |
| record_format | Article |
| series | Zaštita Materijala |
| spelling | doaj-art-0a6a182f96d64cb399a754556876a1172025-08-20T03:17:27ZengEngineering Society for Corrosion, BelgradeZaštita Materijala0351-94652466-25852023-06-0164217718910.5937/zasmat2302177N99Analysis of the causes of fracture of the main gas pipelineLyudmila Nyrkova0Anatolii Rybakov1Larysa Goncharenko2Svetlana Osadchuk3Yulia Kharchenko4E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, UkraineE.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, UkraineE.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, UkraineE.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, UkraineE.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, UkraineA complex of research has been conducted to establish the causes of the accident of the main gas pipeline made of 1420x15.7 mm X70 steel after 20 years of operation. It is found that pipe destruction was initiated by the longitudinal crack with a length of 470 mm and a maximum depth of 6.8 mm, oriented in the direction of the pipe and perpendicular to the outer surface of the pipe identified as stress-corrosion cracking. The crack initiation is due to the disboundment of the tape protection coating, the high corrosion activity of the soil, and the complex stress-strain state caused by deviations from the design objectives during construction. The chemical composition the base metal of all investigated pipes corresponds to the requirements of the technical conditions for steel pipes in category X70; pipes welding are performed with the typical materials used in pipe welding plants. Despite the differences, the structural and mechanical characteristics (yield strength, ultimate strength, and impact strength) of the steel and weld metal of the studied pipes are identical. The relative elongation (d5) of the operated pipes is below the normalized values, but, it is necessary to take into account the possibility of deviations in these characteristics of steel in the initial state. Significant reserves of toughness indirectly indicate low damage of metal and, accordingly, satisfactory resistance to destruction of the metal of the studied pipes.https://www.zastita-materijala.org/index.php/home/article/view/100main pipelineh70 steelmicrostructuremechanical propertiesstress-corrosion crackingcathodic protection |
| spellingShingle | Lyudmila Nyrkova Anatolii Rybakov Larysa Goncharenko Svetlana Osadchuk Yulia Kharchenko Analysis of the causes of fracture of the main gas pipeline Zaštita Materijala main pipeline h70 steel microstructure mechanical properties stress-corrosion cracking cathodic protection |
| title | Analysis of the causes of fracture of the main gas pipeline |
| title_full | Analysis of the causes of fracture of the main gas pipeline |
| title_fullStr | Analysis of the causes of fracture of the main gas pipeline |
| title_full_unstemmed | Analysis of the causes of fracture of the main gas pipeline |
| title_short | Analysis of the causes of fracture of the main gas pipeline |
| title_sort | analysis of the causes of fracture of the main gas pipeline |
| topic | main pipeline h70 steel microstructure mechanical properties stress-corrosion cracking cathodic protection |
| url | https://www.zastita-materijala.org/index.php/home/article/view/100 |
| work_keys_str_mv | AT lyudmilanyrkova analysisofthecausesoffractureofthemaingaspipeline AT anatoliirybakov analysisofthecausesoffractureofthemaingaspipeline AT larysagoncharenko analysisofthecausesoffractureofthemaingaspipeline AT svetlanaosadchuk analysisofthecausesoffractureofthemaingaspipeline AT yuliakharchenko analysisofthecausesoffractureofthemaingaspipeline |