Analysis of Regulating Valve Stem Fracture in a Petrochemical Plant

This paper investigates the failure of a regulating valve stem in a petrochemical plant, which was mainly caused by vibration fatigue under small opening conditions. The fractured valve stem was analyzed using macroscopic analysis, chemical composition analysis, mechanical property analysis, metallo...

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Bibliographic Details
Published in:Processes 2023-04, Vol.11 (4), p.1106
Main Authors: Guo, Fuping, Lyu, Yunrong, Duan, Zhihong, Fan, Zhiqing, Li, Weiming, Chen, Falin
Format: Article
Language:English
Subjects:
Bending stresses
Chemical composition
Chemical industry
Crack propagation
Cross-sections
Energy spectra
Failure analysis
Fatigue failure
Fluid-structure interaction
Fracture surfaces
Fractures
Mechanical properties
Metal fatigue
Modal analysis
Petroleum chemicals industry
Propagation
Research methodology
Simulation
Spectrum analysis
Stainless steel
Stress concentration
Tensile strength
Valves
Vibration
Vibration analysis
Yield stress
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Summary:This paper investigates the failure of a regulating valve stem in a petrochemical plant, which was mainly caused by vibration fatigue under small opening conditions. The fractured valve stem was analyzed using macroscopic analysis, chemical composition analysis, mechanical property analysis, metallographic analysis, fracture surface observation, and energy spectrum analysis. Additionally, fluid-structure interaction (FSI) modal analysis was used to investigate the failure of the regulating valve. The results indicate that the valve opening had a direct impact on the vibration of the valve body, which, when operated at small openings, led to fatigue fracture at the step of variable cross-section. The paper suggests a smooth transition treatment be performed at the variable cross-section of the valve stem to avoid stress concentration. Although this study is limited to a specific case, it provides valuable insights for the failure analysis of valves operating at small openings.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr11041106