Failure analysis of crude heater tube support hangar

Bhaskaran, TA and Venkataswamy, MA and Parameswara, MA and Sujata, M and Keshab, Barai and Bhaumik, SK (2003) Failure analysis of crude heater tube support hangar. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

During a shut down operation, about 16 crude heater tube support hangars were found to have cracks in the clevis lugs. The cracked clevis lug of one such tube was sent to the laboratory to analyse the cause of failure. Investigation revealed that the support hangar has failed by Stress Corrosion Cracking (SCC). Microstructural study indicated that the hangar material got sensitized due to prolonged heating to 7000C in service leading to SCC. The parent material did not have any metallurgical abnormalities and it was found to conform to ASTM A297 Gr HK specification.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Heater tube support hangar;25Cr-20Ni steel;stress corrosion cracking
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 01 Aug 2011 13:41
Last Modified: 01 Aug 2011 13:41
URI: http://nal-ir.nal.res.in/id/eprint/9775

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