Analysis of failed tubes of Visbreaker heater BA41201

Venkataswamy, MA and Sujata, M and Bhaumik, SK (2004) Analysis of failed tubes of Visbreaker heater BA41201. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

Two samples from failed Visbreaker tubes were sent to the laboratory along with a sample of unused tube for analysis. Examination suggests that the tubes have failed due to exposure to high temperature. Microstructural study indicated that the tube material was exposed to over 8000C for a prolonged period. This has resulted in localized oxidation of the tube steel with subsequent reduction in tube-wall thickness. When the thickness became critical, the tubes have either bulged or cracked under the hoop stress. EDX analysis showed that the tube material conforms to A335 (9Cr-1Mo) steel.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Visbreaker heater;9Cr-1Mo steel;overheating;oxidation
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 25 Jul 2011 10:19
Last Modified: 25 Jul 2011 10:19
URI: http://nal-ir.nal.res.in/id/eprint/9580

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