Failure analysis of high pressure flange in a reactor outlet

Madan, M and Sujata, M and Raghavendra, K and Gore, P and Bhaumik, SK (2011) Failure analysis of high pressure flange in a reactor outlet. Project Report. National Aerospace Laboratories, Bangalore, India.

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A cracked gasket ring and a flange belonging to a ring type joint (RTJ) of hydrocracker unit-2 were sent to the laboratory for investigation. Examination revealed that the failure was by sulphide stress corrosion cracking (SCC). Analysis suggests that most probably, the SCC was promoted in the components because of formation of polythionic acid in the system in presence of O2 and/or H2O. Compositional analysis showed that the ring and the flange were fabricated from SS 347 and SS 321 steels respectively. The materials were found to conform to specification and they were used in annealed condition. No metallurgical abnormalities were found responsible for the failure. A detailed analysis of the failure is presented in this report, and a few recommendations suggested.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: High pressure flange;SS 347;SS321;Stress corrosion cracking; Polythionic acid
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 12 Jul 2011 08:40
Last Modified: 12 Jul 2011 08:40

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