Analysis of the causes of cracking of closed impeller blades of centrifugal compressor

SHI Ninggang; HUANG Shenghua; CHEN Song; LIU Fangchao; CHEN Xiaolei

doi:10.7513/j.issn.1004-7638.2025.04.026

Volume 46 Issue 4

Aug. 2025

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SHI Ninggang, HUANG Shenghua, CHEN Song, LIU Fangchao, CHEN Xiaolei. Analysis of the causes of cracking of closed impeller blades of centrifugal compressor[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 197-204. doi: 10.7513/j.issn.1004-7638.2025.04.026

Citation:

SHI Ninggang, HUANG Shenghua, CHEN Song, LIU Fangchao, CHEN Xiaolei. Analysis of the causes of cracking of closed impeller blades of centrifugal compressor[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 197-204. doi: 10.7513/j.issn.1004-7638.2025.04.026

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Analysis of the causes of cracking of closed impeller blades of centrifugal compressor

doi: 10.7513/j.issn.1004-7638.2025.04.026

1.
Production Department of Beijing Pipeline Company of State Pipeline Network Group, Beijing 122000, China
2.
Procurement Center of China Petroleum Pipeline Bureau Engineering Co., Ltd., Langfang 065000, Hebei, China
3.
Shijiazhuang Branch of Beijing Pipeline Company of National Pipeline Network Group, Shijiazhuang 052160, Hebei, China

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Received Date: 2024-09-10
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

After 5 years of production, the closed impeller in a centrifugal compressor used to transport natural gas was found to have cracks in many blade roots during maintenance. In order to clarify the cause of blade cracks, the chemical composition analysis, tensile test, hardness test and metallographic examination of the failed samples were carried out, and one crack was selected for cracking cause analysis. The results showed that defects were generated during the brazing process of the blade and the front cover plate. Cracks were generated at the defect site at the R-angle position of the blade weld during operation, and fatigue propagation occurred into the blade under the action of alternating loads during service, resulting in cracking of the blade. Therefore, the welding quality of the impeller manufacturing and the subsequent factory quality acceptance must be strictly controlled, and non-destructive testing methods must be added to ensure product quality clearance, so as to reduce or avoid this situation.
- S41595 martensitic stainless steel,
- impeller blades,
- failure analysis,
- brazing

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References(19)

References

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