Failure Analysis of Cooling Tower Fan-Arm
| Autor: | Basavaraj Padasale, Subray R. Hegde, J. K. Rakshan Kumar, Sumanth Govindarajan, Pavankumar R. Sondar |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
business.industry
020209 energy Mechanical Engineering 02 engineering and technology Welding Structural engineering law.invention Stress (mechanics) 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials law Residual stress Fatigue loading Solid mechanics Crack initiation 0202 electrical engineering electronic engineering information engineering Fracture (geology) General Materials Science Cooling tower Safety Risk Reliability and Quality business Geology |
| Zdroj: | Journal of Failure Analysis and Prevention. 20:1417-1425 |
| ISSN: | 1864-1245 1547-7029 |
| DOI: | 10.1007/s11668-020-00947-1 |
| Popis: | This work presents failure investigation of cooling tower fan-arms commissioned in a chemical processing plant. The analysis aims at understanding the mechanism and root-cause of the failure. The investigation involves site visits, microstructural analysis, fracture surface analysis, hardness measurements, numerical stress analysis and experimental simulation. Work concludes that the fan-arms failed due to the lack of post-weld heat treatment, which caused localized stress-corrosion and pitting at critical locations that served as crack initiation sites. Fatigue loading condition and presence of residual stresses at the weld enabled easy propagation of cracks that led to recurring premature failure. Based on the root-cause and the mechanism identified in this analysis, proper pre-heating and post-weld heat treatment is recommended to relieve the residual stresses at the critical locations and thus to avoid/minimize such recurring failures in future. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink